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Thu, 09 Sep 2021 17:34:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=7Dh5mijrqSL6MQmilhCXyQSFiAQjt8KP7FPQ6faPMOw=; b=driTY/cgZwcQ++DPNe8eUT09iDJqAdE7pWN9poxLE5gAB1ac7DUl4oiiAa3dQ2RmMh l9kZHcwJGSqKkjpYkTrGB+7rir8eNqNnPlhxQ+FaP9VULsyaMlBJe6qU53Mi48HixANW 9X6xeCfee+EQmilYyJ7E9y1TIMoGYxkkdH+XzBZD7TVghoD/KK4ihE2w6Er/3aff6dd/ yF7BSKppdGHQRN22yErsJUDlo2c89MgBP7QKbkwEpbgrkJe2pUmejPA22P7xtpwG25WB yW79SB7OCNAUzhcwAcj5Pe/BUKeqk1U+MMqETgQGJE/MOCb47+DyraZ8nbmbGi39Ibq+ aFNg== X-Gm-Message-State: AOAM530dhynekQV9/9gR8iUC0O35Qc8ZVnY7dQoU5jiR1YbiCxomlyp6 4xs9eTCRhJKz/CxRTwAd/ianzMjHwsZGjs9sOOSOLq/YvZue X-Google-Smtp-Source: ABdhPJyC+7jV5UnTRapFZb0pUKckB4WZJfmZGQg1CjxY9Nf8jpBYqNWsespvjZZ4H2puy3aKsoqxFOheRqFrEiTeTb3jtBYLkKAH MIME-Version: 1.0 X-Received: by 2002:a92:bf01:: with SMTP id z1mr1018591ilh.155.1631234072620; Thu, 09 Sep 2021 17:34:32 -0700 (PDT) Date: Thu, 09 Sep 2021 17:34:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000071b5b105cb994728@google.com> Subject: [syzbot] kernel panic: panic_on_warn set (3) From: syzbot To: akpm@linux-foundation.org, dvyukov@google.com, elver@google.com, glider@google.com, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Authentication-Results: imf17.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=appspotmail.com (policy=none); spf=pass (imf17.hostedemail.com: domain of 3GKg6YQkbAGMTZaLBMMFSBQQJE.HPPHMFVTFSDPOUFOU.DPN@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com designates 209.85.166.70 as permitted sender) smtp.mailfrom=3GKg6YQkbAGMTZaLBMMFSBQQJE.HPPHMFVTFSDPOUFOU.DPN@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com X-Stat-Signature: guf5xydok3h1psfx7juha9awgoby9gme X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 2ACADF000090 X-HE-Tag: 1631234073-687556 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: Hello, syzbot found the following issue on: HEAD commit: ac08b1c68d1b Merge tag 'pci-v5.15-changes' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16144a63300000 kernel config: https://syzkaller.appspot.com/x/.config?x=16e23f04679ec35e dashboard link: https://syzkaller.appspot.com/bug?extid=8d41ad9c88279d71f7c9 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=136aedb5300000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8d41ad9c88279d71f7c9@syzkaller.appspotmail.com handle drivers/base/devtmpfs.c:382 [inline] devtmpfs_work_loop drivers/base/devtmpfs.c:395 [inline] devtmpfsd+0x1b9/0x2a3 drivers/base/devtmpfs.c:437 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 22 Comm: kdevtmpfs Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 panic+0x2b0/0x6dd kernel/panic.c:232 kfence_report_error.cold+0x304/0xa56 mm/kfence/report.c:264 kfence_handle_page_fault+0x203/0x630 mm/kfence/core.c:880 page_fault_oops+0x1c5/0x6b0 arch/x86/mm/fault.c:686 kernelmode_fixup_or_oops+0x219/0x280 arch/x86/mm/fault.c:755 __bad_area_nosemaphore+0x36d/0x400 arch/x86/mm/fault.c:801 do_kern_addr_fault+0x5b/0x70 arch/x86/mm/fault.c:1200 handle_page_fault arch/x86/mm/fault.c:1473 [inline] exc_page_fault+0x155/0x180 arch/x86/mm/fault.c:1531 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568 RIP: 0010:kvm_fastop_exception+0xf6a/0x1058 Code: d3 ed e9 ef d4 6e f8 49 8d 0e 48 83 e1 f8 4c 8b 21 41 8d 0e 83 e1 07 c1 e1 03 49 d3 ec e9 45 e2 6e f8 49 8d 4d 00 48 83 e1 f8 <4c> 8b 21 41 8d 4d 00 83 e1 07 c1 e1 03 49 d3 ec e9 35 ec 6e f8 bd RSP: 0018:ffffc90000dcfae8 EFLAGS: 00010282 RAX: 0000003361736376 RBX: ffff88806f1e3068 RCX: ffff88823bd14020 RDX: ffffed100de3c614 RSI: 0000000000000005 RDI: 0000000000000007 RBP: 0000000000000005 R08: 0000000000000000 R09: ffff88806f1e3098 R10: ffffed100de3c613 R11: 0000000000000000 R12: ffff88823bd14020 R13: ffff88823bd14020 R14: ffff88806f1e3098 R15: dffffc0000000000 d_lookup+0xd8/0x170 fs/dcache.c:2370 lookup_dcache+0x1e/0x130 fs/namei.c:1520 __lookup_hash+0x29/0x180 fs/namei.c:1543 kern_path_locked+0x17e/0x320 fs/namei.c:2567 handle_remove+0xa2/0x5fe drivers/base/devtmpfs.c:312 handle drivers/base/devtmpfs.c:382 [inline] devtmpfs_work_loop drivers/base/devtmpfs.c:395 [inline] devtmpfsd+0x1b9/0x2a3 drivers/base/devtmpfs.c:437 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Kernel Offset: disabled ---------------- Code disassembly (best guess): 0: d3 ed shr %cl,%ebp 2: e9 ef d4 6e f8 jmpq 0xf86ed4f6 7: 49 8d 0e lea (%r14),%rcx a: 48 83 e1 f8 and $0xfffffffffffffff8,%rcx e: 4c 8b 21 mov (%rcx),%r12 11: 41 8d 0e lea (%r14),%ecx 14: 83 e1 07 and $0x7,%ecx 17: c1 e1 03 shl $0x3,%ecx 1a: 49 d3 ec shr %cl,%r12 1d: e9 45 e2 6e f8 jmpq 0xf86ee267 22: 49 8d 4d 00 lea 0x0(%r13),%rcx 26: 48 83 e1 f8 and $0xfffffffffffffff8,%rcx * 2a: 4c 8b 21 mov (%rcx),%r12 <-- trapping instruction 2d: 41 8d 4d 00 lea 0x0(%r13),%ecx 31: 83 e1 07 and $0x7,%ecx 34: c1 e1 03 shl $0x3,%ecx 37: 49 d3 ec shr %cl,%r12 3a: e9 35 ec 6e f8 jmpq 0xf86eec74 3f: bd .byte 0xbd --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches