From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f71.google.com (mail-io1-f71.google.com [209.85.166.71]) (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 A6B2F23D7D1 for ; Fri, 24 Oct 2025 09:51:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761299465; cv=none; b=VHB8tx2BMoKUQpuhD+uYkMMLek0yIHrv/NlUDqk3XmP2uuM+vqII9oKj7XBwStw4y42+6k9gyd4DYfJ4ZtA1aJ8yWtvGrpyJTcqkuIAGHO3XQsPADu84216kqqRK2gR4wDkmwSTSeDHQTkSfX45WoVb+ycFAeUypkkHdEJPtipM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761299465; c=relaxed/simple; bh=mj3tJ0KoIYmbSbflgAmOwnO+ELBWng642y2BwWnt6h4=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:144d:b0:42f:8eeb:49a1 with SMTP id e9e14a558f8ab-430c523d6fdmr426346795ab.13.1761299462803; Fri, 24 Oct 2025 02:51:02 -0700 (PDT) Date: Fri, 24 Oct 2025 02:51:02 -0700 In-Reply-To: <20251024071531.Cp40p%dmantipov@yandex.ru> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68fb4c06.050a0220.346f24.00ba.GAE@google.com> Subject: Re: [syzbot] [ocfs2?] kernel BUG in __ocfs2_move_extent From: syzbot To: dmantipov@yandex.ru, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: possible deadlock in __ocfs2_flush_truncate_log ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz-executor/5793 is trying to acquire lock: ffff88804461d100 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:815 [inline] ffff88804461d100 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}, at: __ocfs2_flush_truncate_log+0x33d/0x10f0 fs/ocfs2/alloc.c:6054 but task is already holding lock: ffff888040ccb480 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:815 [inline] ffff888040ccb480 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{4:4}, at: ocfs2_flush_truncate_log+0x47/0x70 fs/ocfs2/alloc.c:6083 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{4:4}: lock_acquire+0x1a1/0x430 kernel/locking/lockdep.c:5825 down_write+0x97/0x1f0 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:815 [inline] ocfs2_move_extent fs/ocfs2/move_extents.c:646 [inline] __ocfs2_move_extents_range+0x1a6a/0x3380 fs/ocfs2/move_extents.c:866 ocfs2_move_extents+0x379/0x960 fs/ocfs2/move_extents.c:933 ocfs2_ioctl_move_extents+0x569/0x740 fs/ocfs2/move_extents.c:1065 ocfs2_ioctl+0x192/0x750 fs/ocfs2/ioctl.c:946 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0x100/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x188e/0x5720 kernel/locking/lockdep.c:3904 __lock_acquire+0x138a/0x20c0 kernel/locking/lockdep.c:5202 lock_acquire+0x1a1/0x430 kernel/locking/lockdep.c:5825 down_write+0x97/0x1f0 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:815 [inline] __ocfs2_flush_truncate_log+0x33d/0x10f0 fs/ocfs2/alloc.c:6054 ocfs2_flush_truncate_log+0x4f/0x70 fs/ocfs2/alloc.c:6084 ocfs2_sync_fs+0x117/0x320 fs/ocfs2/super.c:402 sync_filesystem+0x1cf/0x230 fs/sync.c:66 generic_shutdown_super+0x6f/0x2c0 fs/super.c:621 kill_block_super+0x44/0x90 fs/super.c:1710 deactivate_locked_super+0xb9/0x130 fs/super.c:473 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1378 task_work_run+0x1d5/0x260 kernel/task_work.c:239 resume_user_mode_work+0x5e/0x80 include/linux/resume_user_mode.h:50 exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x87/0x130 kernel/entry/common.c:218 do_syscall_64+0x103/0x210 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6); lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5); lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6); lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5); *** DEADLOCK *** 2 locks held by syz-executor/5793: #0: ffff88803ef880e0 (&type->s_umount_key#54){+.+.}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88803ef880e0 (&type->s_umount_key#54){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88803ef880e0 (&type->s_umount_key#54){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505 #1: ffff888040ccb480 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:815 [inline] #1: ffff888040ccb480 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{4:4}, at: ocfs2_flush_truncate_log+0x47/0x70 fs/ocfs2/alloc.c:6083 stack backtrace: CPU: 0 UID: 0 PID: 5793 Comm: syz-executor Not tainted syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: dump_stack_lvl+0x18a/0x250 lib/dump_stack.c:120 print_circular_bug+0x13b/0x1b0 kernel/locking/lockdep.c:2074 check_noncircular+0x2b5/0x3b0 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x188e/0x5720 kernel/locking/lockdep.c:3904 __lock_acquire+0x138a/0x20c0 kernel/locking/lockdep.c:5202 lock_acquire+0x1a1/0x430 kernel/locking/lockdep.c:5825 down_write+0x97/0x1f0 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:815 [inline] __ocfs2_flush_truncate_log+0x33d/0x10f0 fs/ocfs2/alloc.c:6054 ocfs2_flush_truncate_log+0x4f/0x70 fs/ocfs2/alloc.c:6084 ocfs2_sync_fs+0x117/0x320 fs/ocfs2/super.c:402 sync_filesystem+0x1cf/0x230 fs/sync.c:66 generic_shutdown_super+0x6f/0x2c0 fs/super.c:621 kill_block_super+0x44/0x90 fs/super.c:1710 deactivate_locked_super+0xb9/0x130 fs/super.c:473 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1378 task_work_run+0x1d5/0x260 kernel/task_work.c:239 resume_user_mode_work+0x5e/0x80 include/linux/resume_user_mode.h:50 exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x87/0x130 kernel/entry/common.c:218 do_syscall_64+0x103/0x210 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd40db901f7 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffd33164b08 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007fd40dc11d7d RCX: 00007fd40db901f7 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd33164bc0 RBP: 00007ffd33164bc0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd33165c50 R13: 00007fd40dc11d7d R14: 000000000002060d R15: 00007ffd33165c90 (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) (syz-executor,5793,0):ocfs2_inode_is_valid_to_delete:872 ERROR: Skipping delete of system file 72 ocfs2: Unmounting device (7,0) on (node local) Tested on: commit: 4fc43deb Linux 6.12.55 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-6.12.y console output: https://syzkaller.appspot.com/x/log.txt?x=126ddb04580000 kernel config: https://syzkaller.appspot.com/x/.config?x=fe7b438dcda9b036 dashboard link: https://syzkaller.appspot.com/bug?extid=727d161855d11d81e411 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=177c7734580000