[v6.1] possible deadlock in dqget (2)
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syzbot
Jun 30, 2025, 1:34:29 PM6/30/25
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 7e69c33e4858 Linux 6.1.142
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1639988c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c13e5b1e791632f6
dashboard link: https://syzkaller.appspot.com/bug?extid=48f6149796b9cd8dc4e4
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/66227cc7a961/disk-7e69c33e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/800396fbefa3/vmlinux-7e69c33e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9164f62e8709/bzImage-7e69c33e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+48f614...@syzkaller.appspotmail.com
EXT4-fs: Journaled quota options ignored when QUOTA feature is enabled
EXT4-fs (loop2): mounted filesystem without journal. Quota mode: writeback.
======================================================
WARNING: possible circular locking dependency detected
6.1.142-syzkaller #0 Not tainted
------------------------------------------------------
syz.2.11138/30581 is trying to acquire lock:
ffff888072421228 (&dquot->dq_lock){+.+.}-{3:3}, at: wait_on_dquot fs/quota/dquot.c:356 [inline]
ffff888072421228 (&dquot->dq_lock){+.+.}-{3:3}, at: dqget+0x6f8/0xeb0 fs/quota/dquot.c:983
but task is already holding lock:
ffff888059085b10 (&ei->xattr_sem){++++}-{3:3}, at: ext4_setattr+0x92a/0x19f0 fs/ext4/inode.c:5501
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #5 (&ei->xattr_sem){++++}-{3:3}:
down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520
ext4_setattr+0x92a/0x19f0 fs/ext4/inode.c:5501
notify_change+0xc74/0xf40 fs/attr.c:499
chown_common+0x486/0x620 fs/open.c:736
do_fchownat+0x164/0x270 fs/open.c:767
__do_sys_chown fs/open.c:787 [inline]
__se_sys_chown fs/open.c:785 [inline]
__x64_sys_chown+0x7e/0x90 fs/open.c:785
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #4 (jbd2_handle){++++}-{0:0}:
start_this_handle+0x1f49/0x2150 fs/jbd2/transaction.c:463
jbd2__journal_start+0x2b7/0x5a0 fs/jbd2/transaction.c:520
jbd2_journal_start+0x26/0x30 fs/jbd2/transaction.c:559
ocfs2_start_trans+0x372/0x6c0 fs/ocfs2/journal.c:376
ocfs2_shutdown_local_alloc+0x1fd/0xa10 fs/ocfs2/localalloc.c:416
ocfs2_dismount_volume+0x1fc/0x930 fs/ocfs2/super.c:1882
generic_shutdown_super+0x130/0x340 fs/super.c:501
kill_block_super+0x7c/0xe0 fs/super.c:1470
deactivate_locked_super+0x93/0xf0 fs/super.c:332
cleanup_mnt+0x463/0x4f0 fs/namespace.c:1182
task_work_run+0x1ca/0x250 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #3 (&journal->j_trans_barrier){.+.+}-{3:3}:
down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520
ocfs2_start_trans+0x366/0x6c0 fs/ocfs2/journal.c:374
ocfs2_shutdown_local_alloc+0x1fd/0xa10 fs/ocfs2/localalloc.c:416
ocfs2_dismount_volume+0x1fc/0x930 fs/ocfs2/super.c:1882
generic_shutdown_super+0x130/0x340 fs/super.c:501
kill_block_super+0x7c/0xe0 fs/super.c:1470
deactivate_locked_super+0x93/0xf0 fs/super.c:332
cleanup_mnt+0x463/0x4f0 fs/namespace.c:1182
task_work_run+0x1ca/0x250 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #2 (sb_internal#2){.+.+}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1891 [inline]
sb_start_intwrite include/linux/fs.h:2013 [inline]
ocfs2_start_trans+0x267/0x6c0 fs/ocfs2/journal.c:372
ocfs2_acquire_dquot+0x66e/0xb10 fs/ocfs2/quota_global.c:848
dqget+0x778/0xeb0 fs/quota/dquot.c:988
dquot_set_dqblk+0x27/0xf90 fs/quota/dquot.c:2833
quota_setquota+0x4ac/0x530 fs/quota/quota.c:310
__do_sys_quotactl fs/quota/quota.c:960 [inline]
__se_sys_quotactl+0x295/0x6b0 fs/quota/quota.c:916
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #1 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}:
down_write+0x36/0x60 kernel/locking/rwsem.c:1573
ocfs2_create_local_dquot+0x1a0/0x1790 fs/ocfs2/quota_local.c:1224
ocfs2_acquire_dquot+0x7ae/0xb10 fs/ocfs2/quota_global.c:871
dqget+0x778/0xeb0 fs/quota/dquot.c:988
dquot_set_dqblk+0x27/0xf90 fs/quota/dquot.c:2833
quota_setquota+0x4ac/0x530 fs/quota/quota.c:310
__do_sys_quotactl fs/quota/quota.c:960 [inline]
__se_sys_quotactl+0x295/0x6b0 fs/quota/quota.c:916
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #0 (&dquot->dq_lock){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain kernel/locking/lockdep.c:3825 [inline]
__lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049
lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x120/0xaf0 kernel/locking/mutex.c:747
wait_on_dquot fs/quota/dquot.c:356 [inline]
dqget+0x6f8/0xeb0 fs/quota/dquot.c:983
dquot_transfer+0x63f/0x820 fs/quota/dquot.c:2164
ext4_setattr+0x93d/0x19f0 fs/ext4/inode.c:5502
notify_change+0xc74/0xf40 fs/attr.c:499
chown_common+0x486/0x620 fs/open.c:736
do_fchownat+0x164/0x270 fs/open.c:767
__do_sys_chown fs/open.c:787 [inline]
__se_sys_chown fs/open.c:785 [inline]
__x64_sys_chown+0x7e/0x90 fs/open.c:785
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
other info that might help us debug this:
Chain exists of:
&dquot->dq_lock --> jbd2_handle --> &ei->xattr_sem
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ei->xattr_sem);
lock(jbd2_handle);
lock(&ei->xattr_sem);
lock(&dquot->dq_lock);
*** DEADLOCK ***
3 locks held by syz.2.11138/30581:
#0: ffff88801a6c2460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393
#1: ffff888059085e48 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
#1: ffff888059085e48 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: chown_common+0x320/0x620 fs/open.c:726
#2: ffff888059085b10 (&ei->xattr_sem){++++}-{3:3}, at: ext4_setattr+0x92a/0x19f0 fs/ext4/inode.c:5501
stack backtrace:
CPU: 1 PID: 30581 Comm: syz.2.11138 Not tainted 6.1.142-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
check_noncircular+0x274/0x310 kernel/locking/lockdep.c:2170
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain kernel/locking/lockdep.c:3825 [inline]
__lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049
lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x120/0xaf0 kernel/locking/mutex.c:747
wait_on_dquot fs/quota/dquot.c:356 [inline]
dqget+0x6f8/0xeb0 fs/quota/dquot.c:983
dquot_transfer+0x63f/0x820 fs/quota/dquot.c:2164
ext4_setattr+0x93d/0x19f0 fs/ext4/inode.c:5502
notify_change+0xc74/0xf40 fs/attr.c:499
chown_common+0x486/0x620 fs/open.c:736
do_fchownat+0x164/0x270 fs/open.c:767
__do_sys_chown fs/open.c:787 [inline]
__se_sys_chown fs/open.c:785 [inline]
__x64_sys_chown+0x7e/0x90 fs/open.c:785
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f941618e929
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:00007f9416f88038 EFLAGS: 00000246 ORIG_RAX: 000000000000005c
RAX: ffffffffffffffda RBX: 00007f94163b5fa0 RCX: 00007f941618e929
RDX: 000000000000ee00 RSI: ffffffffffffffff RDI: 0000200000000040
RBP: 00007f9416210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f94163b5fa0 R15: 00007ffd7573a0d8
</TASK>
Quota error (device loop2): do_check_range: Getting dqdh_prev_free 1792 out of range 0-6
Quota error (device loop2): qtree_write_dquot: Error -117 occurred while creating quota
EXT4-fs error (device loop2): ext4_acquire_dquot:6814: comm syz.2.11138: Failed to acquire dquot type 1
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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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:
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If you want to overwrite report's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 7e69c33e4858 Linux 6.1.142
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1639988c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c13e5b1e791632f6
dashboard link: https://syzkaller.appspot.com/bug?extid=48f6149796b9cd8dc4e4
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/66227cc7a961/disk-7e69c33e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/800396fbefa3/vmlinux-7e69c33e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9164f62e8709/bzImage-7e69c33e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+48f614...@syzkaller.appspotmail.com
EXT4-fs: Journaled quota options ignored when QUOTA feature is enabled
EXT4-fs (loop2): mounted filesystem without journal. Quota mode: writeback.
======================================================
WARNING: possible circular locking dependency detected
6.1.142-syzkaller #0 Not tainted
------------------------------------------------------
syz.2.11138/30581 is trying to acquire lock:
ffff888072421228 (&dquot->dq_lock){+.+.}-{3:3}, at: wait_on_dquot fs/quota/dquot.c:356 [inline]
ffff888072421228 (&dquot->dq_lock){+.+.}-{3:3}, at: dqget+0x6f8/0xeb0 fs/quota/dquot.c:983
but task is already holding lock:
ffff888059085b10 (&ei->xattr_sem){++++}-{3:3}, at: ext4_setattr+0x92a/0x19f0 fs/ext4/inode.c:5501
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #5 (&ei->xattr_sem){++++}-{3:3}:
down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520
ext4_setattr+0x92a/0x19f0 fs/ext4/inode.c:5501
notify_change+0xc74/0xf40 fs/attr.c:499
chown_common+0x486/0x620 fs/open.c:736
do_fchownat+0x164/0x270 fs/open.c:767
__do_sys_chown fs/open.c:787 [inline]
__se_sys_chown fs/open.c:785 [inline]
__x64_sys_chown+0x7e/0x90 fs/open.c:785
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #4 (jbd2_handle){++++}-{0:0}:
start_this_handle+0x1f49/0x2150 fs/jbd2/transaction.c:463
jbd2__journal_start+0x2b7/0x5a0 fs/jbd2/transaction.c:520
jbd2_journal_start+0x26/0x30 fs/jbd2/transaction.c:559
ocfs2_start_trans+0x372/0x6c0 fs/ocfs2/journal.c:376
ocfs2_shutdown_local_alloc+0x1fd/0xa10 fs/ocfs2/localalloc.c:416
ocfs2_dismount_volume+0x1fc/0x930 fs/ocfs2/super.c:1882
generic_shutdown_super+0x130/0x340 fs/super.c:501
kill_block_super+0x7c/0xe0 fs/super.c:1470
deactivate_locked_super+0x93/0xf0 fs/super.c:332
cleanup_mnt+0x463/0x4f0 fs/namespace.c:1182
task_work_run+0x1ca/0x250 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #3 (&journal->j_trans_barrier){.+.+}-{3:3}:
down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520
ocfs2_start_trans+0x366/0x6c0 fs/ocfs2/journal.c:374
ocfs2_shutdown_local_alloc+0x1fd/0xa10 fs/ocfs2/localalloc.c:416
ocfs2_dismount_volume+0x1fc/0x930 fs/ocfs2/super.c:1882
generic_shutdown_super+0x130/0x340 fs/super.c:501
kill_block_super+0x7c/0xe0 fs/super.c:1470
deactivate_locked_super+0x93/0xf0 fs/super.c:332
cleanup_mnt+0x463/0x4f0 fs/namespace.c:1182
task_work_run+0x1ca/0x250 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #2 (sb_internal#2){.+.+}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1891 [inline]
sb_start_intwrite include/linux/fs.h:2013 [inline]
ocfs2_start_trans+0x267/0x6c0 fs/ocfs2/journal.c:372
ocfs2_acquire_dquot+0x66e/0xb10 fs/ocfs2/quota_global.c:848
dqget+0x778/0xeb0 fs/quota/dquot.c:988
dquot_set_dqblk+0x27/0xf90 fs/quota/dquot.c:2833
quota_setquota+0x4ac/0x530 fs/quota/quota.c:310
__do_sys_quotactl fs/quota/quota.c:960 [inline]
__se_sys_quotactl+0x295/0x6b0 fs/quota/quota.c:916
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #1 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}:
down_write+0x36/0x60 kernel/locking/rwsem.c:1573
ocfs2_create_local_dquot+0x1a0/0x1790 fs/ocfs2/quota_local.c:1224
ocfs2_acquire_dquot+0x7ae/0xb10 fs/ocfs2/quota_global.c:871
dqget+0x778/0xeb0 fs/quota/dquot.c:988
dquot_set_dqblk+0x27/0xf90 fs/quota/dquot.c:2833
quota_setquota+0x4ac/0x530 fs/quota/quota.c:310
__do_sys_quotactl fs/quota/quota.c:960 [inline]
__se_sys_quotactl+0x295/0x6b0 fs/quota/quota.c:916
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #0 (&dquot->dq_lock){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain kernel/locking/lockdep.c:3825 [inline]
__lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049
lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x120/0xaf0 kernel/locking/mutex.c:747
wait_on_dquot fs/quota/dquot.c:356 [inline]
dqget+0x6f8/0xeb0 fs/quota/dquot.c:983
dquot_transfer+0x63f/0x820 fs/quota/dquot.c:2164
ext4_setattr+0x93d/0x19f0 fs/ext4/inode.c:5502
notify_change+0xc74/0xf40 fs/attr.c:499
chown_common+0x486/0x620 fs/open.c:736
do_fchownat+0x164/0x270 fs/open.c:767
__do_sys_chown fs/open.c:787 [inline]
__se_sys_chown fs/open.c:785 [inline]
__x64_sys_chown+0x7e/0x90 fs/open.c:785
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
other info that might help us debug this:
Chain exists of:
&dquot->dq_lock --> jbd2_handle --> &ei->xattr_sem
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ei->xattr_sem);
lock(jbd2_handle);
lock(&ei->xattr_sem);
lock(&dquot->dq_lock);
*** DEADLOCK ***
3 locks held by syz.2.11138/30581:
#0: ffff88801a6c2460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393
#1: ffff888059085e48 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
#1: ffff888059085e48 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: chown_common+0x320/0x620 fs/open.c:726
#2: ffff888059085b10 (&ei->xattr_sem){++++}-{3:3}, at: ext4_setattr+0x92a/0x19f0 fs/ext4/inode.c:5501
stack backtrace:
CPU: 1 PID: 30581 Comm: syz.2.11138 Not tainted 6.1.142-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
check_noncircular+0x274/0x310 kernel/locking/lockdep.c:2170
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain kernel/locking/lockdep.c:3825 [inline]
__lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049
lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x120/0xaf0 kernel/locking/mutex.c:747
wait_on_dquot fs/quota/dquot.c:356 [inline]
dqget+0x6f8/0xeb0 fs/quota/dquot.c:983
dquot_transfer+0x63f/0x820 fs/quota/dquot.c:2164
ext4_setattr+0x93d/0x19f0 fs/ext4/inode.c:5502
notify_change+0xc74/0xf40 fs/attr.c:499
chown_common+0x486/0x620 fs/open.c:736
do_fchownat+0x164/0x270 fs/open.c:767
__do_sys_chown fs/open.c:787 [inline]
__se_sys_chown fs/open.c:785 [inline]
__x64_sys_chown+0x7e/0x90 fs/open.c:785
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f941618e929
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:00007f9416f88038 EFLAGS: 00000246 ORIG_RAX: 000000000000005c
RAX: ffffffffffffffda RBX: 00007f94163b5fa0 RCX: 00007f941618e929
RDX: 000000000000ee00 RSI: ffffffffffffffff RDI: 0000200000000040
RBP: 00007f9416210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f94163b5fa0 R15: 00007ffd7573a0d8
</TASK>
Quota error (device loop2): do_check_range: Getting dqdh_prev_free 1792 out of range 0-6
Quota error (device loop2): qtree_write_dquot: Error -117 occurred while creating quota
EXT4-fs error (device loop2): ext4_acquire_dquot:6814: comm syz.2.11138: Failed to acquire dquot type 1
---
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syzbot
Jan 30, 2026, 1:00:14 PMJan 30
to syzkaller...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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