From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f79.google.com (mail-ot1-f79.google.com [209.85.210.79]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 620572F39C7 for ; Sun, 26 Apr 2026 21:18:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777238310; cv=none; b=pDd3z/PceBC2UsdJgHBbw22eYGacBhHwtZ4Y1WVRR+PMkkctT1xnRt0MxLtlvqKFacqI8ww3FpCurR4DqCIUtJIS9LV8Si8xk76JpyzWdfEEGi5RsQAel7RlGmBJZ3delMET+DUBGZ87ZO1SFxU13xixX0u26vcuoVv5aJXjWWU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777238310; c=relaxed/simple; bh=Q+gw/1KFdgX/E/Ofdk68AVFDrDMppizub1NBy5OtBDs=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=RL7t4rSQaaYumFLKfrcNs4gZ9RsFczvPSAsY2Ih5N0d42ZzSxiA+g6CBpEajs4FXEgcjGO8gY0i6jzIsWl60eGmwDyhaZjuzHmMr0dEhIUcIN8NePArQGl42qwZB8WmG5JoIZlEhS+MniAQyLGzaMv9IuloqYCjjEpU7zhMNteo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.79 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f79.google.com with SMTP id 46e09a7af769-7dbd60b7ecbso19512340a34.1 for ; Sun, 26 Apr 2026 14:18:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777238308; x=1777843108; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=94k/1Ss9fpvg6ryXUn00EOh1/+r0EKV7MciQNFc6mRE=; b=szdzkHh27OO/iU3qm0hDsu/kDL0AJmRmCCZ1cgIMZeaXYam/AWKJbVkOldfNIsVVv0 +SRMEyZfqLvSFnlfTrQiyaZ2/L2pdK0MRsmzmCaeISlZ+3r6AzvuXaQdMHwzlp214fvT 9bzdLwNiWIrY3HK5BtMRnfXyakAWZ6+BEI+gjxw17QKep4rJzpQ8ov79eZ/6h8uKk2/z aBDi67I/wY7GetNH0y4X0ok5mLQpXYxoJluhX65DydZTzzKJRinUR1n4XLq1jSOYrV3v IdORRzMuvsL7lBYrDJS0y6N1KF3bYbAyA1pgyr11GZnpRmlDK/MHA5k1CDbjODUN70Lz YNvg== X-Forwarded-Encrypted: i=1; AFNElJ/aQE+CCDk5/MEpmAhSiDk2wgrvi+gNBq9IcHCKBoJg/aINBDOj15mbJ8nAN6gg5/RM0L+q1lvz25DX@vger.kernel.org X-Gm-Message-State: AOJu0YzXNhpmH4pD/aUobRqtZM+jbLZ/AFSFOedw6S9bw+QCAXJnNyKr jlf1i6g24RBOL4z59vQQdp6SaCxnU2Q0pTQ9eiVLCgcFMp+SqabLSCQUBtVagI8Ef+bORt0f2cC WZIHBrxg+lBhlQHgAlRjREMCHTyGlEZKm2o7CgH5e0NQCmqcKwoy1SvH4I8c= Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:c90:b0:688:6d55:195 with SMTP id 006d021491bc7-69462f2f14fmr24547672eaf.57.1777238308293; Sun, 26 Apr 2026 14:18:28 -0700 (PDT) Date: Sun, 26 Apr 2026 14:18:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69ee8124.170a0220.11de9.0012.GAE@google.com> Subject: [syzbot] [ext4?] BUG: sleeping function called from invalid context in jbd2_journal_commit_transaction From: syzbot To: jack@suse.com, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tytso@mit.edu Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 6596a02b2078 Merge tag 'drm-next-2026-04-22' of https://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=120d3702580000 kernel config: https://syzkaller.appspot.com/x/.config?x=80b28e8d6ef9384a dashboard link: https://syzkaller.appspot.com/bug?extid=06294fd562f060379c91 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5b2b3122db47/disk-6596a02b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7ee12b37f6e5/vmlinux-6596a02b.xz kernel image: https://storage.googleapis.com/syzbot-assets/aca25073993c/bzImage-6596a02b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+06294fd562f060379c91@syzkaller.appspotmail.com BUG: sleeping function ca[ 92.150581][ T5155] BUG: sleeping function called from invalid context at fs/jbd2/commit.c:1071 in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 5155, name: jbd2/sda1-8 preempt_count: 0, expected: 0 RCU nest depth: 2, expected: 1 3 locks held by jbd2/sda1-8/5155: #0: ffffffff8dfc80c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffffffff8dfc80c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff8dfc80c0 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline] #0: ffffffff8dfc80c0 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400 kernel/locking/spinlock_rt.c:57 #1: ffff888036ea4920 (&journal->j_list_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline] #1: ffff888036ea4920 (&journal->j_list_lock){+.+.}-{3:3}, at: jbd2_journal_commit_transaction+0x3ad1/0x5b20 fs/jbd2/commit.c:993 #2: ffffffff8dfc80c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #2: ffffffff8dfc80c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #2: ffffffff8dfc80c0 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline] #2: ffffffff8dfc80c0 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400 kernel/locking/spinlock_rt.c:57 CPU: 0 UID: 0 PID: 5155 Comm: jbd2/sda1-8 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 __might_resched+0x329/0x480 kernel/sched/core.c:9162 jbd2_journal_commit_transaction+0x3f59/0x5b20 fs/jbd2/commit.c:1071 kjournald2+0x3e0/0x760 fs/jbd2/journal.c:201 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ------------[ cut here ]------------ Voluntary context switch within RCU read-side critical section! WARNING: kernel/rcu/tree_plugin.h:332 at rcu_note_context_switch+0xcac/0xf40 kernel/rcu/tree_plugin.h:332, CPU#0: jbd2/sda1-8/5155 Modules linked in: CPU: 0 UID: 0 PID: 5155 Comm: jbd2/sda1-8 Tainted: G W syzkaller #0 PREEMPT_{RT,(full)} Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:rcu_note_context_switch+0xcac/0xf40 kernel/rcu/tree_plugin.h:332 Code: 00 41 c6 45 00 00 48 8b 3d a1 20 e1 0d 48 81 c4 b8 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d e9 bb 5f ff ff 48 8d 3d a4 e2 e4 0d <67> 48 0f b9 3a e9 1b f4 ff ff 90 0f 0b 90 45 84 e4 0f 84 ea f3 ff RSP: 0018:ffffc90010177930 EFLAGS: 00010002 RAX: 0000000000000000 RBX: ffff888036ec5c40 RCX: 0000000080000002 RDX: 0000000000000000 RSI: ffffffff8ba74040 RDI: ffffffff8f8f3dd0 RBP: dffffc0000000000 R08: ffffffff8f8bcef7 R09: 1ffffffff1f179de R10: dffffc0000000000 R11: fffffbfff1f179df R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8880b883c800 R15: ffff888036ec6104 FS: 0000000000000000(0000) GS:ffff8881260fb000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055557df50340 CR3: 0000000011b24000 CR4: 00000000003526f0 Call Trace: __schedule+0x291/0x54c0 kernel/sched/core.c:7043 __schedule_loop kernel/sched/core.c:7267 [inline] schedule+0x164/0x360 kernel/sched/core.c:7282 kjournald2+0x410/0x760 fs/jbd2/journal.c:230 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: 00 41 c6 add %al,-0x3a(%rcx) 3: 45 00 00 add %r8b,(%r8) 6: 48 8b 3d a1 20 e1 0d mov 0xde120a1(%rip),%rdi # 0xde120ae d: 48 81 c4 b8 00 00 00 add $0xb8,%rsp 14: 5b pop %rbx 15: 41 5c pop %r12 17: 41 5d pop %r13 19: 41 5e pop %r14 1b: 41 5f pop %r15 1d: 5d pop %rbp 1e: e9 bb 5f ff ff jmp 0xffff5fde 23: 48 8d 3d a4 e2 e4 0d lea 0xde4e2a4(%rip),%rdi # 0xde4e2ce * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 1b f4 ff ff jmp 0xfffff44f 34: 90 nop 35: 0f 0b ud2 37: 90 nop 38: 45 84 e4 test %r12b,%r12b 3b: 0f .byte 0xf 3c: 84 ea test %ch,%dl 3e: f3 repz 3f: ff .byte 0xff --- 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. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup