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Mon, 24 Oct 2022 02:35:53 +0000 Date: Mon, 24 Oct 2022 03:35:53 +0100 From: Matthew Wilcox To: syzbot Cc: akpm@linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] inconsistent lock state in _atomic_dec_and_lock Message-ID: References: <000000000000cd8af105ebb7e570@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <000000000000cd8af105ebb7e570@google.com> ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1666578953; 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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=1+M0C9J3MwcVvah0KT62unV/jmKo053Y3vHawSUO1dA=; b=MYQJZGzN4vIhmDkIO6rn5PWmMkegR2jcidh979jTgiiwbFuwToQExGhRR0RyxKpRXe1vSa 9JFV3Puw3QFQ1XNGmISMtbcpAx12vHEOHGYT8mnI57pzmZF+XwUZDTV0/Oh4TghxaWL34E iDg6Rndw/LX7aDKTezlWo5wjsIOU5GQ= ARC-Authentication-Results: i=1; imf10.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=M0hL9qCU; spf=none (imf10.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1666578953; a=rsa-sha256; cv=none; b=wHYe3S9LY2Sa/7Yf0ohZixa6GYddLMPr6QQvYZaIxNpjScwpSLFelbZO6Imwj9odnmGNQ5 bfwpiF4WUIkbL/pZG9DQu286ACns47y5/jrCgw/tE4ghfVUrQLVRg1lGPq2Sg6wNyU0Ro9 tzM/am201FeLYg5EyYM67/xjmusqJXU= X-Stat-Signature: utcem77xmj39izdfexcsjfdfdiujm4oe X-Rspam-User: Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=M0hL9qCU; spf=none (imf10.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org; dmarc=none X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 46ED7C0034 X-HE-Tag: 1666578952-271582 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: On Sun, Oct 23, 2022 at 11:32:30AM -0700, syzbot wrote: > ================================ > WARNING: inconsistent lock state > 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Not tainted > -------------------------------- > inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage. > syz-executor.3/9712 [HC0[0]:SC0[0]:HE1:SE1] takes: > ffff0000d10c2577 (&folio_wait_table[i]){?.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline] > ffff0000d10c2577 (&folio_wait_table[i]){?.-.}-{2:2}, at: _atomic_dec_and_lock+0xc8/0x130 lib/dec_and_lock.c:28 > {IN-HARDIRQ-W} state was registered at: > lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 > __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] > _raw_spin_lock_irqsave+0x6c/0xb4 kernel/locking/spinlock.c:162 > folio_wake_bit+0x88/0x254 mm/filemap.c:1143 This is clearly complete garbage. If we're using spin_lock_irqsave(), then we can't have a {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} problem. > stack backtrace: > CPU: 1 PID: 9712 Comm: syz-executor.3 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 > Call trace: > dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156 > show_stack+0x2c/0x54 arch/arm64/kernel/stacktrace.c:163 > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106 > dump_stack+0x1c/0x58 lib/dump_stack.c:113 > print_usage_bug+0x39c/0x3cc kernel/locking/lockdep.c:3961 > mark_lock_irq+0x4a8/0x4b4 > mark_lock+0x154/0x1b4 kernel/locking/lockdep.c:4632 > mark_usage kernel/locking/lockdep.c:4541 [inline] > __lock_acquire+0x5f8/0x30a4 kernel/locking/lockdep.c:5007 > lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 > __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] > _raw_spin_lock+0x54/0x6c kernel/locking/spinlock.c:154 > spin_lock include/linux/spinlock.h:349 [inline] > _atomic_dec_and_lock+0xc8/0x130 lib/dec_and_lock.c:28 > iput+0x50/0x324 fs/inode.c:1766 > ntfs_fill_super+0x1254/0x14a4 fs/ntfs3/super.c:1190 Oh. ntfs probably corrupted the lockdep state. Also, this is a completely different lock from the first one. So I'm going to ignore this report.