From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C0B0CD2FED9 for ; Tue, 27 Jan 2026 18:51:34 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E12FC6B0005; Tue, 27 Jan 2026 13:51:33 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id DEB0D6B0089; Tue, 27 Jan 2026 13:51:33 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CBF5B6B008A; Tue, 27 Jan 2026 13:51:33 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id B9E156B0005 for ; Tue, 27 Jan 2026 13:51:33 -0500 (EST) Received: from smtpin25.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 8373E1401A1 for ; Tue, 27 Jan 2026 18:51:33 +0000 (UTC) X-FDA: 84378637266.25.47C2995 Received: from mail-pj1-f52.google.com (mail-pj1-f52.google.com [209.85.216.52]) by imf20.hostedemail.com (Postfix) with ESMTP id 6A76F1C000D for ; Tue, 27 Jan 2026 18:51:31 +0000 (UTC) Authentication-Results: imf20.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b=jnPSSavn; spf=pass (imf20.hostedemail.com: domain of andrii.nakryiko@gmail.com designates 209.85.216.52 as permitted sender) smtp.mailfrom=andrii.nakryiko@gmail.com; arc=pass ("google.com:s=arc-20240605:i=1"); dmarc=pass (policy=none) header.from=gmail.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1769539891; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=8ZQeTNPkxXp69ol8Z73/dPpyrDbveradQi2tvfEY8nI=; b=6r4oY18r+8R6lCTsZyRyLVUbglRPIeqj3pIol5YuNXZdievSACB4H1tExiVK4IqfkGSRgA RXQ90O1P+ffR4aT8xPh/5bI+hDxlXv1ecZnIm4TPt+JiXoJJ1hkqztYShDaV+um/XF+hnC 6umx20h9kQGdeM8oZAAXJcP8PMwb1+0= ARC-Authentication-Results: i=2; imf20.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b=jnPSSavn; spf=pass (imf20.hostedemail.com: domain of andrii.nakryiko@gmail.com designates 209.85.216.52 as permitted sender) smtp.mailfrom=andrii.nakryiko@gmail.com; arc=pass ("google.com:s=arc-20240605:i=1"); dmarc=pass (policy=none) header.from=gmail.com ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1769539891; a=rsa-sha256; cv=pass; b=C+6IdoN+s80MkCRZnkTnjviRMKLa9eICcwWN1PRbrRp1AW7ufowVy0o0WDwS5qQrhSBjJa hUIGlxh0EDq6kfVyfTA9iUqxanXBVYdziyHMewOJWxNCjRPHxUp3Yxgnp7MFf0W/fnFWOr oe/UfT7gnlS6rejv7CEoBILqvT83tgs= Received: by mail-pj1-f52.google.com with SMTP id 98e67ed59e1d1-34b75fba315so3556943a91.3 for ; Tue, 27 Jan 2026 10:51:31 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1769539890; cv=none; d=google.com; s=arc-20240605; b=jvWCjrorcfBGhyvD4J7XlN/J3svqxF8UjBaZfOmMZJA595iEt3vkBDNlVy4Fwz2+BB w6CgSh5FTFMm6bpb3XfiFJ10IR14AFb6eM8Hhb7lAd4nhXCnC6GbekhBJn7hH+us9qtE wSCgGrZNDsDl/pjVidgQD7xVV7lm7mM/wm7CAaO9t43A7YQMQvrzNb4fNXlcdNkHi1kH Wmx8J2SZO1tSFCAjDBhWigHIt1KtwQqBBcoi85xZvPox2J5xWwEA4zDKjMIEBzImShdz 03KXSLbnrSdekdrAoe/6cFhciLaimKGzZWBNPqfL4NMYDk6bMQBtwMQZGq1TMeGHUXs1 tXww== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20240605; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:dkim-signature; bh=8ZQeTNPkxXp69ol8Z73/dPpyrDbveradQi2tvfEY8nI=; fh=6sgDDqKPVwK2Ct0qtoUi6bWjsEfxBLuM+oDfQ/dA4s4=; b=PLzWMhSJAkLgC4lIsyDD9f851g4I5ncZIffwYOBOwK3POvfSQNxR5Jnro5i9k7C9uK eB1Dnu447DRXX0kngVCwFjkR26UPvDTqVEcZHWLDbNqq33H00ebzXQ1gRKaiqqa9q1Wk SIM+2MreyXaqj9rlMChHcfF39lQnbDJGvwrqjADguvmFpLW2fz7wOPacIuoAxRmp1Qt7 AEqb0wsNwiCEofQjcYPDiUXAJTHk2+seuSe/RrpGObbZ5AWReKpGVnGzX5vl3MEGMXMw Y/m6/yOLJ1YtdTQtoK5dXM3SbA9vAqa8+alI+pf75ZLYTdGnjrIvlhVK6lpukPXwtN6t QKkg==; darn=kvack.org ARC-Authentication-Results: i=1; mx.google.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1769539890; x=1770144690; darn=kvack.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=8ZQeTNPkxXp69ol8Z73/dPpyrDbveradQi2tvfEY8nI=; b=jnPSSavnYdwCberDvc1KFvucfhXyGaXyV76EMJpZ1WUzdUnyhzW8CWVti2TWS97baB qdlTNGbG9QLKLkDneDXF4iUPFOAPJxGKFnjScS2GHlFt2vpeyT0KGBIWEMtjTP2Yfjzb tnnMzcfjS5JQKii0MYB6CD45Oxe+m4u/DkIg6L2CYYXPvspS0xY4peChHSG6/dZGLN8y csFo9IrxfT6zA5AuPGqQH2inR2RWAGAzjMKcuVAuQdkXFUDLoGSZNT+NMFRCUxG38rwQ KMuMOxxhDWg4hHtAjt4CYkKmd0EmMxP3HsUqW2eDfPsGSGInnI/cqlOUGQnGBR9JtQWI XDFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769539890; x=1770144690; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=8ZQeTNPkxXp69ol8Z73/dPpyrDbveradQi2tvfEY8nI=; b=HK4B4AI3y3Fqr1W2EZFPRueN0vFt8uhdjo3fsiZeCM8Dda9Vmi05rEUcxubv0hICzb hE+0MfkwwgGWc+E9M2m2SWG1k8FdofKPMj+G52GwqC2Z/poMOS7R9oJh85OKT5qnciDC 9Us117L+pCCyOmy06EbeQq61yz7TXFqWXrBTq1opq3NsmGbZH0n3/m+KrGiz7/sSyOTC N+lHuWaOfAOtcaLdRbE4onzPf1ePbie279yquzxogAreTkH3KegCiamb2Na/P3Erle2B +/4F7h+JZ1VWaIC2S7ZipQBTQ784pfVoJq40Fpc88vL2z8JkHHvMgTgy1bAFos9rFkQz O5qg== X-Forwarded-Encrypted: i=1; AJvYcCVQfCFwDQ07inIA4yvFfp/uiO3tAePA7Xl7Du0lZxCtz5ecy3vCJeQXWxSkUiSk3JzEjfNCVeeCew==@kvack.org X-Gm-Message-State: AOJu0YyMSJx4w6Fd34Iw5kc9f1tHmfIIs7XVw9ChfRv5wt7uMBkNpJwX JYrPHhlRoG6h6/ojLQGXxw/hCIZZPT4Qnnp7I8Q496LFicItcKAA/Dw/b7GIJ7Tg15JTDIAF3IN K59eKCjrRz4ws+l3zOS68BW9MmEYG6gA= X-Gm-Gg: AZuq6aL/pIgouJ6wMFFHmr40zqE6TfLCGUgMZnp5RAZoJeyoX6TOgnkmgNBp/Fhr7D5 gr+o6K9RsgN0HrajnYCQusPRMHlkmFi/KjfAsNGDTNBP+OugLLPA49yliZu0sm6A6rWDkwK03ot EX0tVKJp54bsgCMrLGNhKZUZPe3KlQydzCrJKmt3SXN+zE0Az0q0UMvITIy7+559CUJIeQ7/2mm IxW+cE0p0Yxc71wkvMHiybUYFiOgRs/e6fpCf74kkl0ntWS+GWHUwzjAPDJ6TIWAfPhmKry4ZPl Qnhv+He8oM0= X-Received: by 2002:a17:90a:ee88:b0:353:3f04:1b78 with SMTP id 98e67ed59e1d1-353fecd096emr1737019a91.4.1769539890073; Tue, 27 Jan 2026 10:51:30 -0800 (PST) MIME-Version: 1.0 References: <697400dc.a70a0220.35de72.000a.GAE@google.com> <20260124113148.2398-1-hdanton@sina.com> In-Reply-To: From: Andrii Nakryiko Date: Tue, 27 Jan 2026 10:51:18 -0800 X-Gm-Features: AZwV_QiA0zOEZwy3CGiU5Z7PZD-Lu8x_VhA2pfyCwt-cEsRO07_OBuI3OkaSFLA Message-ID: Subject: Re: [syzbot] [block?] possible deadlock in blkdev_read_iter To: Suren Baghdasaryan Cc: Hillf Danton , syzbot , axboe@kernel.dk, linux-block@vger.kernel.org, Lorenzo Stoakes , linux-mm@kvack.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 6A76F1C000D X-Stat-Signature: gxjt3gkz1zf1bxztphpy4h4pt4u41g3u X-Rspam-User: X-HE-Tag: 1769539891-975218 X-HE-Meta: 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 pJXvgG+Y 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 0HLhTIVO bVNGz+j9J4bfvzurRc2n41csCLC/2HubX+8dky66t1rhudDSBixtX3Gz8tSWUuG2itQJrPBBwwK0+Vkc3ImVM9vmqQ+Q3BLLGW5vnwLKmbC4nGm/WoT6z72gRLuJDH1/NWHx5+E0eqEF0tMos7UsW0Hj01UZF/fgUkn4ZD5t6KyGqfff1l/bXCYeZv3OybAy5Hs+yy0dJlLFyYe4PRr24MHhq/fO0lrEnP/xgg33Sbd88JTMJW4tVg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Jan 26, 2026 at 6:22=E2=80=AFPM Suren Baghdasaryan wrote: > > On Mon, Jan 26, 2026 at 2:33=E2=80=AFPM Suren Baghdasaryan wrote: > > > > On Mon, Jan 26, 2026 at 9:20=E2=80=AFAM Suren Baghdasaryan wrote: > > > > > > On Sat, Jan 24, 2026 at 3:32=E2=80=AFAM Hillf Danton wrote: > > > > > > > > Add Lorenzo and Suren > > > > > > Thanks! > > > > > > > > > > > > Date: Fri, 23 Jan 2026 15:14:36 -0800 > > > > > Hello, > > > > > > > > > > syzbot found the following issue on: > > > > > > > > > > HEAD commit: 24d479d26b25 Linux 6.19-rc6 > > > > > git tree: upstream > > > > > console output: https://syzkaller.appspot.com/x/log.txt?x=3D10003= 3fa580000 > > > > > kernel config: https://syzkaller.appspot.com/x/.config?x=3D18594= 76832863c41 > > > > > dashboard link: https://syzkaller.appspot.com/bug?extid=3D4e70c8e= 0a2017b432f7a > > > > > compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GN= U Binutils for Debian) 2.40 > > > > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D114= 51b9a580000 > > > > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D1045e= 852580000 > > > > > > > > > > Downloadable assets: > > > > > disk image (non-bootable): https://storage.googleapis.com/syzbot-= assets/d900f083ada3/non_bootable_disk-24d479d2.raw.xz > > > > > vmlinux: https://storage.googleapis.com/syzbot-assets/d0f3c47f686= 9/vmlinux-24d479d2.xz > > > > > kernel image: https://storage.googleapis.com/syzbot-assets/800231= 513703/bzImage-24d479d2.xz > > > > > > > > > > IMPORTANT: if you fix the issue, please add the following tag to = the commit: > > > > > Reported-by: syzbot+4e70c8e0a2017b432f7a@syzkaller.appspotmail.co= m > > > > > > > > > > WARNING: possible circular locking dependency detected > > > > > syzkaller #0 Not tainted > > > > > ------------------------------------------------------ > > > > > syz.0.17/6091 is trying to acquire lock: > > > > > ffff8881061287a8 ( > > > > > &sb->s_type->i_mutex_key#8){++++}-{4:4}, at: inode_lock_shared in= clude/linux/fs.h:1042 [inline] > > > > > &sb->s_type->i_mutex_key#8){++++}-{4:4}, at: blkdev_read_iter+0x1= 9e/0x500 block/fops.c:855 > > > > > > > > > > but task is already holding lock: > > > > > ffff888012aa0448 (vm_lock){++++}-{0:0}, at: lock_next_vma+0x10e/0= xed0 mm/mmap_lock.c:334 > > > > > > > > > > which lock already depends on the new lock. > > > > > > > > > > > > > > > the existing dependency chain (in reverse order) is: > > > > > > > > > > -> #2 (vm_lock){++++}-{0:0}: > > > > > __vma_enter_locked+0x260/0x770 mm/mmap_lock.c:72 > > > > > __vma_start_write+0x21/0x160 mm/mmap_lock.c:104 > > > > > vma_start_write include/linux/mmap_lock.h:213 [inline] > > > > > mprotect_fixup+0x4e3/0xb80 mm/mprotect.c:768 > > > > > setup_arg_pages+0x4a2/0xbb0 fs/exec.c:670 > > > > > load_elf_binary+0xb5b/0x4fe0 fs/binfmt_elf.c:1028 > > > > > search_binary_handler fs/exec.c:1669 [inline] > > > > > exec_binprm fs/exec.c:1701 [inline] > > > > > bprm_execve fs/exec.c:1753 [inline] > > > > > bprm_execve+0x8c2/0x1620 fs/exec.c:1729 > > > > > kernel_execve+0x2ef/0x3b0 fs/exec.c:1919 > > > > > try_to_run_init_process init/main.c:1506 [inline] > > > > > kernel_init+0x14a/0x2b0 init/main.c:1634 > > > > > ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 > > > > > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 > > > > > > > > > > -> #1 (&mm->mmap_lock){++++}-{4:4}: > > > > > __might_fault mm/memory.c:7174 [inline] > > > > > __might_fault+0x113/0x190 mm/memory.c:7168 > > > > > _copy_to_iter+0x1c2/0x1710 lib/iov_iter.c:196 > > > > > copy_page_to_iter lib/iov_iter.c:374 [inline] > > > > > copy_page_to_iter+0x12a/0x1e0 lib/iov_iter.c:361 > > > > > copy_folio_to_iter include/linux/uio.h:204 [inline] > > > > > filemap_read+0x6b1/0xe40 mm/filemap.c:2851 > > > > > blkdev_read_iter+0x1ac/0x500 block/fops.c:856 > > > > > new_sync_read fs/read_write.c:491 [inline] > > > > > vfs_read+0x8bf/0xcf0 fs/read_write.c:572 > > > > > ksys_read+0x12a/0x250 fs/read_write.c:715 > > > > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > > > > do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 > > > > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > > > > > > > > > -> #0 (&sb->s_type->i_mutex_key#8){++++}-{4:4}: > > > > > check_prev_add kernel/locking/lockdep.c:3165 [inline] > > > > > check_prevs_add kernel/locking/lockdep.c:3284 [inline] > > > > > validate_chain kernel/locking/lockdep.c:3908 [inline] > > > > > __lock_acquire+0x1669/0x2890 kernel/locking/lockdep.c:5237 > > > > > lock_acquire kernel/locking/lockdep.c:5868 [inline] > > > > > lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825 > > > > > down_read+0x9b/0x460 kernel/locking/rwsem.c:1537 > > > > > inode_lock_shared include/linux/fs.h:1042 [inline] > > > > > blkdev_read_iter+0x19e/0x500 block/fops.c:855 > > > > > __kernel_read+0x3f3/0xbf0 fs/read_write.c:530 > > > > > freader_fetch+0x1d7/0x9d0 lib/buildid.c:100 > > > > > __build_id_parse.isra.0+0xdd/0x6c0 lib/buildid.c:297 > > > > > do_procmap_query+0xb0e/0x1080 fs/proc/task_mmu.c:733 > > > > > procfs_procmap_ioctl+0x9d/0xe0 fs/proc/task_mmu.c:813 > > > > > vfs_ioctl fs/ioctl.c:51 [inline] > > > > > __do_sys_ioctl fs/ioctl.c:597 [inline] > > > > > __se_sys_ioctl fs/ioctl.c:583 [inline] > > > > > __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 > > > > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > > > > do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 > > > > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > > > > > > > > > > It looks like: > > > #0 is executing PROCMAP_QUERY ioclt, read-locks vm_lock and then call= s > > > build_id_parse()->__build_id_parse(..., > > > may_fault=3Dtrue)->__kernel_read() which eventually takes > > > inode->i_rwsem. > > > #1 is a file-backed page fault which asserts that it might take > > > mmap_lock for read. > > > #2 is load_elf_binary()->mprotect_fixup() which write-locks both > > > mmap_lock and vm_lock. I'm guessing it already holds inode->i_rwsem > > > before write-locking these locks. > > > > > > Originally I thought the issue is most liley introduced in > > > d9d1c2d81797 ("fs/proc/task_mmu: execute PROCMAP_QUERY ioctl under > > > per-vma locks"). But if #2 indeed takes inode->i_rwsem before > > > write-locking mmap_lock, then the problem should exist even before > > > that change when we didn't use vm_lock and relied on mmap_lock... > > > > > > I'll try to analyze this more before attempting a fix. > > > > I was able to reproduce the same issue even after reverting > > d9d1c2d81797. The deadlock in this case is simpler and involves > > mmap_lock instead of vm_lock (see below). > > Looks like the race is between the read() syscall and do_procmap_query(= ). > > I'll continue investigating, in the meantime CC'ing Andrii. > > So, here is a cleaner version of that report (with d9d1c2d81797 reverted)= : > > -> #1 (&mm->mmap_lock){++++}-{4:4}: > __might_fault+0xed/0x170 > _copy_to_iter+0x118/0x1720 > copy_page_to_iter+0x12d/0x1e0 > filemap_read+0x720/0x10a0 > blkdev_read_iter+0x2b5/0x4e0 > vfs_read+0x7f4/0xae0 > ksys_read+0x12a/0x250 > do_syscall_64+0xcb/0xf80 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > -> #0 (&sb->s_type->i_mutex_key#8){++++}-{4:4}: > __lock_acquire+0x1509/0x26d0 > lock_acquire+0x185/0x340 > down_read+0x98/0x490 > blkdev_read_iter+0x2a7/0x4e0 > __kernel_read+0x39a/0xa90 > freader_fetch+0x1d5/0xa80 > __build_id_parse.isra.0+0xea/0x6a0 > do_procmap_query+0xd75/0x1050 > procfs_procmap_ioctl+0x7a/0xb0 > __x64_sys_ioctl+0x18e/0x210 > do_syscall_64+0xcb/0xf80 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > other info that might help us debug this: > > Possible unsafe locking scenario: > > CPU0 CPU1 > ---- ---- > rlock(&mm->mmap_lock); > lock(&sb->s_type->i_mutex_key#8); > lock(&mm->mmap_lock); > rlock(&sb->s_type->i_mutex_key#8); > > *** DEADLOCK *** > > Both threads are calling blkdev_read_iter(), which uses > inode_lock_shared() to read-lock inode->i_rwsem. I'm not sure why CPU1 > shows lock() instead of rlock(). So both threads read-lock > inode->i_rwsem and mmap_lock but in a different order. IIUC, with > read-locks this should not deadlock until some other thread > write-locks the mmap_lock in between and this becomes a real deadlock: > > CPU0 CPU1 CPU2 > ---- ---- ---- > rlock(&mm->mmap_lock); > rlock(&sb->s_type->i_mutex_key#8); > wlock(&mm->mmap_lock) <-- waiting for CPU0 > rlock(&mm->mmap_lock); <-- waiting for CP= U1 > rlock(&sb->s_type->i_mutex_key#8); <-- waiting for CPU2 > > I believe in the original report this write-locking thread was the one > calling mprotect_fixup(). > > Per https://docs.kernel.org/mm/process_addrs.html#lock-ordering, > inode->i_rwsem should be locked before mm->mmap_lock, so > procfs_procmap_ioctl() has to be fixed to follow this lock ordering. > One possibility I can think of is to use build_id_parse_nofault() > first and if it fails because the required page is not faulted, we do > freader_init_from_file(), then drop the mmap/vma lock and execute > freader_fetch() outside of these locks to fault in that page. Once > that's done, we'll retry the whole operation and this time > build_id_parse_nofault() should pass (unless we already evicted that > page, which is extremely unlikely and in that case, we'll retry > again). > > I tried a POC with build_id_parse_nofault() but without the whole > dance with freader_init_from_file/freader_fetch and the deadlock is > gone. Andrii, WDYT? I don't like it :) Too much complexity, _nofault() variant only makes sense for BPF in non-sleepable contexts. I think this can be fixed simpler and cleaner. We don't need to hold VMA lock while fetching build ID. Build ID works with vma's vm_file, so we can just get its reference, drop vma lock, then fetch build id. Below diff passes our BPF selftests. Might need to think about a bit leaner code changes, but the idea should be clear. Diff below will be butchered by gmail, but you can fetch it at [0]. Do you mind validating that deadlock is gone? Thanks! [0] https://git.kernel.org/pub/scm/linux/kernel/git/andrii/bpf-next.git/com= mit/?h=3Dprocmap-query-vma-deadlock-fix&id=3D7faf95b63a8a7ac6e78b6d90101c94= bfa6ecdfd1 Author: Andrii Nakryiko Date: Tue Jan 27 10:46:04 2026 -0800 procfs: avoid fetching build ID while holding VMA lock Signed-off-by: Andrii Nakryiko diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 81dfc26bfae8..564bf82e3731 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -656,6 +656,7 @@ static int do_procmap_query(struct mm_struct *mm, void __user *uarg) struct proc_maps_locking_ctx lock_ctx =3D { .mm =3D mm }; struct procmap_query karg; struct vm_area_struct *vma; + struct file *vm_file =3D NULL; const char *name =3D NULL; char build_id_buf[BUILD_ID_SIZE_MAX], *name_buf =3D NULL; __u64 usize; @@ -720,6 +721,9 @@ static int do_procmap_query(struct mm_struct *mm, void __user *uarg) karg.dev_major =3D MAJOR(inode->i_sb->s_dev); karg.dev_minor =3D MINOR(inode->i_sb->s_dev); karg.inode =3D inode->i_ino; + + if (karg.build_id_size) + vm_file =3D get_file(vma->vm_file); } else { karg.vma_offset =3D 0; karg.dev_major =3D 0; @@ -727,21 +731,6 @@ static int do_procmap_query(struct mm_struct *mm, void __user *uarg) karg.inode =3D 0; } - if (karg.build_id_size) { - __u32 build_id_sz; - - err =3D build_id_parse(vma, build_id_buf, &build_id_sz); - if (err) { - karg.build_id_size =3D 0; - } else { - if (karg.build_id_size < build_id_sz) { - err =3D -ENAMETOOLONG; - goto out; - } - karg.build_id_size =3D build_id_sz; - } - } - if (karg.vma_name_size) { size_t name_buf_sz =3D min_t(size_t, PATH_MAX, karg.vma_name_size); const struct path *path; @@ -779,6 +768,28 @@ static int do_procmap_query(struct mm_struct *mm, void __user *uarg) query_vma_teardown(&lock_ctx); mmput(mm); + if (karg.build_id_size) { + __u32 build_id_sz; + + err =3D -ENOENT; + if (vm_file) + err =3D build_id_parse_file(vm_file, build_id_buf, &build_id_sz); + if (err) { + karg.build_id_size =3D 0; + } else { + if (karg.build_id_size < build_id_sz) { + err =3D -ENAMETOOLONG; + goto out; + } + karg.build_id_size =3D build_id_sz; + } + } + + if (vm_file) { + fput(vm_file); + vm_file =3D NULL; + } + if (karg.vma_name_size && copy_to_user(u64_to_user_ptr(karg.vma_name_addr), name, karg.vma_name_size)) { kfree(name_buf); @@ -797,6 +808,8 @@ static int do_procmap_query(struct mm_struct *mm, void __user *uarg) out: query_vma_teardown(&lock_ctx); + if (vm_file) + fput(vm_file); mmput(mm); kfree(name_buf); return err; diff --git a/include/linux/buildid.h b/include/linux/buildid.h index 831c1b4b626c..7acc06b22fb7 100644 --- a/include/linux/buildid.h +++ b/include/linux/buildid.h @@ -7,7 +7,10 @@ #define BUILD_ID_SIZE_MAX 20 struct vm_area_struct; +struct file; + int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id, __u32 *size); +int build_id_parse_file(struct file *file, unsigned char *build_id, __u32 *size); int build_id_parse_nofault(struct vm_area_struct *vma, unsigned char *build_id, __u32 *size); int build_id_parse_buf(const void *buf, unsigned char *build_id, u32 buf_s= ize); diff --git a/lib/buildid.c b/lib/buildid.c index aaf61dfc0919..c0002129d526 100644 --- a/lib/buildid.c +++ b/lib/buildid.c @@ -271,7 +271,7 @@ static int get_build_id_64(struct freader *r, unsigned char *build_id, __u32 *si /* enough for Elf64_Ehdr, Elf64_Phdr, and all the smaller requests */ #define MAX_FREADER_BUF_SZ 64 -static int __build_id_parse(struct vm_area_struct *vma, unsigned char *build_id, +static int __build_id_parse(struct file *file, unsigned char *build_id, __u32 *size, bool may_fault) { const Elf32_Ehdr *ehdr; @@ -279,11 +279,7 @@ static int __build_id_parse(struct vm_area_struct *vma, unsigned char *build_id, char buf[MAX_FREADER_BUF_SZ]; int ret; - /* only works for page backed storage */ - if (!vma->vm_file) - return -EINVAL; - - freader_init_from_file(&r, buf, sizeof(buf), vma->vm_file, may_faul= t); + freader_init_from_file(&r, buf, sizeof(buf), file, may_fault); /* fetch first 18 bytes of ELF header for checks */ ehdr =3D freader_fetch(&r, 0, offsetofend(Elf32_Ehdr, e_type)); @@ -324,7 +320,11 @@ static int __build_id_parse(struct vm_area_struct *vma, unsigned char *build_id, */ int build_id_parse_nofault(struct vm_area_struct *vma, unsigned char *build_id, __u32 *size) { - return __build_id_parse(vma, build_id, size, false /* !may_fault */= ); + /* only works for page backed storage */ + if (!vma->vm_file) + return -EINVAL; + + return __build_id_parse(vma->vm_file, build_id, size, false /* !may_fault */); } /* @@ -340,7 +340,16 @@ int build_id_parse_nofault(struct vm_area_struct *vma, unsigned char *build_id, */ int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id, __u32 *size) { - return __build_id_parse(vma, build_id, size, true /* may_fault */); + /* only works for page backed storage */ + if (!vma->vm_file) + return -EINVAL; + + return __build_id_parse(vma->vm_file, build_id, size, true /* may_fault */); +} + +int build_id_parse_file(struct file *file, unsigned char *build_id, __u32 *size) +{ + return __build_id_parse(file, build_id, size, true /* may_fault */)= ; } /** > > > > > [ 62.320932][ T9229] > > [ 62.321471][ T9229] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > [ 62.323016][ T9229] WARNING: possible circular locking dependency de= tected > > [ 62.324618][ T9229] 6.19.0-rc6-00001-g40bea6261b2a #42 Not tainted > > [ 62.326013][ T9229] ------------------------------------------------= ------ > > [ 62.327560][ T9229] hillf/9229 is trying to acquire lock: > > [ 62.328821][ T9229] ffff888145b7b5a8 > > (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: > > blkdev_read_iter+0x2a7/0x4e0 > > [ 62.331102][ T9229] > > [ 62.331102][ T9229] but task is already holding lock: > > [ 62.332722][ T9229] ffff888183a6e540 (&mm->mmap_lock){++++}-{4:4}, > > at: do_procmap_query+0x39f/0x1050 > > [ 62.334795][ T9229] > > [ 62.334795][ T9229] which lock already depends on the new lock. > > [ 62.334795][ T9229] > > [ 62.337072][ T9229] > > [ 62.337072][ T9229] the existing dependency chain (in reverse order)= is: > > [ 62.338998][ T9229] > > [ 62.338998][ T9229] -> #1 (&mm->mmap_lock){++++}-{4:4}: > > [ 62.340646][ T9229] __might_fault+0xed/0x170 > > [ 62.341763][ T9229] _copy_to_iter+0x118/0x1720 > > [ 62.342913][ T9229] copy_page_to_iter+0x12d/0x1e0 > > [ 62.344167][ T9229] filemap_read+0x720/0x10a0 > > [ 62.345298][ T9229] blkdev_read_iter+0x2b5/0x4e0 > > [ 62.346480][ T9229] vfs_read+0x7f4/0xae0 > > [ 62.347518][ T9229] ksys_read+0x12a/0x250 > > [ 62.348584][ T9229] do_syscall_64+0xcb/0xf80 > > [ 62.349707][ T9229] entry_SYSCALL_64_after_hwframe+0x77/0x7f > > [ 62.351116][ T9229] > > [ 62.351116][ T9229] -> #0 (&sb->s_type->i_mutex_key#8){++++}-{4:4}: > > [ 62.353012][ T9229] __lock_acquire+0x1509/0x26d0 > > [ 62.354213][ T9229] lock_acquire+0x185/0x340 > > [ 62.355323][ T9229] down_read+0x98/0x490 > > [ 62.356441][ T9229] blkdev_read_iter+0x2a7/0x4e0 > > [ 62.357619][ T9229] __kernel_read+0x39a/0xa90 > > [ 62.358767][ T9229] freader_fetch+0x1d5/0xa80 > > [ 62.359927][ T9229] __build_id_parse.isra.0+0xea/0x6a0 > > [ 62.361232][ T9229] do_procmap_query+0xd75/0x1050 > > [ 62.362434][ T9229] procfs_procmap_ioctl+0x7a/0xb0 > > [ 62.363687][ T9229] __x64_sys_ioctl+0x18e/0x210 > > [ 62.364863][ T9229] do_syscall_64+0xcb/0xf80 > > [ 62.365977][ T9229] entry_SYSCALL_64_after_hwframe+0x77/0x7f > > [ 62.367394][ T9229] > > [ 62.367394][ T9229] other info that might help us debug this: > > [ 62.367394][ T9229] > > [ 62.369637][ T9229] Possible unsafe locking scenario: > > [ 62.369637][ T9229] > > [ 62.371237][ T9229] CPU0 CPU1 > > [ 62.372441][ T9229] ---- ---- > > [ 62.373687][ T9229] rlock(&mm->mmap_lock); > > [ 62.374688][ T9229] > > lock(&sb->s_type->i_mutex_key#8); > > [ 62.376444][ T9229] lock(&mm->mmap_lo= ck); > > [ 62.377956][ T9229] rlock(&sb->s_type->i_mutex_key#8); > > [ 62.379165][ T9229] > > [ 62.379165][ T9229] *** DEADLOCK *** > > [ 62.379165][ T9229] > > [ 62.380952][ T9229] 1 lock held by hillf/9229: > > [ 62.381971][ T9229] #0: ffff888183a6e540 > > (&mm->mmap_lock){++++}-{4:4}, at: do_procmap_query+0x39f/0x1050 > > [ 62.384162][ T9229] > > [ 62.384162][ T9229] stack backtrace: > > [ 62.385458][ T9229] CPU: 3 UID: 0 PID: 9229 Comm: hillf Not tainted > > 6.19.0-rc6-00001-g40bea6261b2a #42 PREEMPT(full) > > [ 62.385471][ T9229] Hardware name: QEMU Standard PC (i440FX + PIIX, > > 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014 > > [ 62.385477][ T9229] Call Trace: > > [ 62.385482][ T9229] > > [ 62.385487][ T9229] dump_stack_lvl+0x100/0x190 > > [ 62.385505][ T9229] print_circular_bug.cold+0x185/0x1d5 > > [ 62.385521][ T9229] check_noncircular+0x14a/0x170 > > [ 62.385534][ T9229] __lock_acquire+0x1509/0x26d0 > > [ 62.385547][ T9229] lock_acquire+0x185/0x340 > > [ 62.385557][ T9229] ? blkdev_read_iter+0x2a7/0x4e0 > > [ 62.385569][ T9229] ? __pfx___might_resched+0x10/0x10 > > [ 62.385583][ T9229] down_read+0x98/0x490 > > [ 62.385593][ T9229] ? blkdev_read_iter+0x2a7/0x4e0 > > [ 62.385603][ T9229] ? __pfx_down_read+0x10/0x10 > > [ 62.385612][ T9229] ? lock_acquire+0x185/0x340 > > [ 62.385622][ T9229] ? is_bpf_text_address+0x25/0x1a0 > > [ 62.385634][ T9229] blkdev_read_iter+0x2a7/0x4e0 > > [ 62.385645][ T9229] __kernel_read+0x39a/0xa90 > > [ 62.385658][ T9229] ? __pfx___kernel_read+0x10/0x10 > > [ 62.385671][ T9229] ? __lock_acquire+0x481/0x26d0 > > [ 62.385683][ T9229] freader_fetch+0x1d5/0xa80 > > [ 62.385697][ T9229] ? find_held_lock+0x2b/0x80 > > [ 62.385712][ T9229] ? __pfx_freader_fetch+0x10/0x10 > > [ 62.385725][ T9229] ? __asan_memset+0x27/0x50 > > [ 62.385737][ T9229] __build_id_parse.isra.0+0xea/0x6a0 > > [ 62.385751][ T9229] ? __pfx___build_id_parse.isra.0+0x10/0x10 > > [ 62.385766][ T9229] ? __pfx_find_vma+0x10/0x10 > > [ 62.385774][ T9229] ? __might_fault+0x129/0x170 > > [ 62.385788][ T9229] do_procmap_query+0xd75/0x1050 > > [ 62.385798][ T9229] ? __pfx_do_procmap_query+0x10/0x10 > > [ 62.385807][ T9229] ? __sanitizer_cov_trace_switch+0x53/0x90 > > [ 62.385817][ T9229] ? do_vfs_ioctl+0x226/0x13b0 > > [ 62.385828][ T9229] ? __pfx_do_vfs_ioctl+0x10/0x10 > > [ 62.385839][ T9229] ? putname+0xfc/0x1b0 > > [ 62.385846][ T9229] ? putname+0x101/0x1b0 > > [ 62.385857][ T9229] ? __x64_sys_openat+0x143/0x210 > > [ 62.385867][ T9229] procfs_procmap_ioctl+0x7a/0xb0 > > [ 62.385877][ T9229] ? __pfx_procfs_procmap_ioctl+0x10/0x10 > > [ 62.385888][ T9229] __x64_sys_ioctl+0x18e/0x210 > > [ 62.385899][ T9229] do_syscall_64+0xcb/0xf80 > > [ 62.385913][ T9229] entry_SYSCALL_64_after_hwframe+0x77/0x7f > > [ 62.385923][ T9229] RIP: 0033:0x412209 > > [ 62.385931][ T9229] Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f > > 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b > > 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 > > 64 89 01 48 > > [ 62.385940][ T9229] RSP: 002b:00007fff380d5588 EFLAGS: 00000217 > > ORIG_RAX: 0000000000000010 > > [ 62.385950][ T9229] RAX: ffffffffffffffda RBX: 00007fff380d56c8 > > RCX: 0000000000412209 > > [ 62.385956][ T9229] RDX: 0000200000000180 RSI: 00000000c0686611 > > RDI: 0000000000000004 > > [ 62.385962][ T9229] RBP: 00007fff380d55a0 R08: 0000000000000000 > > R09: 00007fff380d5640 > > [ 62.385968][ T9229] R10: 0000000000000000 R11: 0000000000000217 > > R12: 00007fff380d56b8 > > [ 62.385974][ T9229] R13: 0000000000000002 R14: 00000000004a0e40 > > R15: 0000000000000002 > > [ 62.385982][ T9229] > > > > > > > > > > > > > > other info that might help us debug this: > > > > > > > > > > Chain exists of: > > > > > &sb->s_type->i_mutex_key#8 --> &mm->mmap_lock --> vm_lock > > > > > > > > > > Possible unsafe locking scenario: > > > > > > > > > > CPU0 CPU1 > > > > > ---- ---- > > > > > rlock(vm_lock); > > > > > lock(&mm->mmap_lock); > > > > > lock(vm_lock); > > > > > rlock(&sb->s_type->i_mutex_key#8); > > > > > > > > > > *** DEADLOCK *** > > > > > > > > > > 1 lock held by syz.0.17/6091: > > > > > #0: ffff888012aa0448 (vm_lock){++++}-{0:0}, at: lock_next_vma+0x= 10e/0xed0 mm/mmap_lock.c:334 > > > > > > > > > > stack backtrace: > > > > > CPU: 2 UID: 0 PID: 6091 Comm: syz.0.17 Not tainted syzkaller #0 P= REEMPT(full) > > > > > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-d= ebian-1.16.3-2~bpo12+1 04/01/2014 > > > > > Call Trace: > > > > > > > > > > __dump_stack lib/dump_stack.c:94 [inline] > > > > > dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 > > > > > print_circular_bug+0x275/0x340 kernel/locking/lockdep.c:2043 > > > > > check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175 > > > > > check_prev_add kernel/locking/lockdep.c:3165 [inline] > > > > > check_prevs_add kernel/locking/lockdep.c:3284 [inline] > > > > > validate_chain kernel/locking/lockdep.c:3908 [inline] > > > > > __lock_acquire+0x1669/0x2890 kernel/locking/lockdep.c:5237 > > > > > lock_acquire kernel/locking/lockdep.c:5868 [inline] > > > > > lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825 > > > > > down_read+0x9b/0x460 kernel/locking/rwsem.c:1537 > > > > > inode_lock_shared include/linux/fs.h:1042 [inline] > > > > > blkdev_read_iter+0x19e/0x500 block/fops.c:855 > > > > > __kernel_read+0x3f3/0xbf0 fs/read_write.c:530 > > > > > freader_fetch+0x1d7/0x9d0 lib/buildid.c:100 > > > > > __build_id_parse.isra.0+0xdd/0x6c0 lib/buildid.c:297 > > > > > do_procmap_query+0xb0e/0x1080 fs/proc/task_mmu.c:733 > > > > > procfs_procmap_ioctl+0x9d/0xe0 fs/proc/task_mmu.c:813 > > > > > vfs_ioctl fs/ioctl.c:51 [inline] > > > > > __do_sys_ioctl fs/ioctl.c:597 [inline] > > > > > __se_sys_ioctl fs/ioctl.c:583 [inline] > > > > > __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 > > > > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > > > > do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 > > > > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > > > > RIP: 0033:0x7ff1a238f7c9 > > > > > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8= 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d = 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 > > > > > RSP: 002b:00007ffebbe538b8 EFLAGS: 00000246 ORIG_RAX: 00000000000= 00010 > > > > > RAX: ffffffffffffffda RBX: 00007ff1a25e5fa0 RCX: 00007ff1a238f7c9 > > > > > RDX: 0000200000000180 RSI: 00000000c0686611 RDI: 0000000000000004 > > > > > RBP: 00007ff1a2413f91 R08: 0000000000000000 R09: 0000000000000000 > > > > > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > > > > > R13: 00007ff1a25e5fa0 R14: 00007ff1a25e5fa0 R15: 0000000000000003 > > > > >