EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
EXT4-fs (loop5): shut down requested (0)
======================================================
WARNING: possible circular locking dependency detected
6.16.0-rc3-syzkaller-00190-g67a993863163 #0 Not tainted
------------------------------------------------------
syz.5.353/9178 is trying to acquire lock:
ffff88802f9ea618 (sb_internal){++++}-{0:0}, at: sb_wait_write fs/super.c:1900 [inline]
ffff88802f9ea618 (sb_internal){++++}-{0:0}, at: freeze_super+0x8b7/0x1130 fs/super.c:2183
but task is already holding lock:
ffff88802f9ea520 (sb_pagefaults){++++}-{0:0}, at: sb_wait_write fs/super.c:1900 [inline]
ffff88802f9ea520 (sb_pagefaults){++++}-{0:0}, at: freeze_super+0x50a/0x1130 fs/super.c:2169
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (sb_pagefaults){++++}-{0:0}:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
percpu_down_read_internal+0x48/0x1c0 include/linux/percpu-rwsem.h:53
percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
__sb_start_write include/linux/fs.h:1795 [inline]
sb_start_pagefault include/linux/fs.h:1960 [inline]
ext4_page_mkwrite+0x1e3/0x1110 fs/ext4/inode.c:6576
do_page_mkwrite+0x14a/0x310 mm/memory.c:3378
do_shared_fault mm/memory.c:5666 [inline]
do_fault mm/memory.c:5728 [inline]
do_pte_missing mm/memory.c:4251 [inline]
handle_pte_fault mm/memory.c:6069 [inline]
__handle_mm_fault+0x1a60/0x5620 mm/memory.c:6212
handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6381
do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
-> #3 (&mm->mmap_lock){++++}-{4:4}:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
__might_fault+0xcc/0x130 mm/memory.c:6971
_inline_copy_to_user include/linux/uaccess.h:192 [inline]
_copy_to_user+0x2c/0xb0 lib/usercopy.c:26
copy_to_user include/linux/uaccess.h:225 [inline]
fiemap_fill_next_extent+0x1c0/0x390 fs/ioctl.c:145
ocfs2_fiemap+0x888/0xc90 fs/ocfs2/extent_map.c:806
ioctl_fiemap fs/ioctl.c:220 [inline]
do_vfs_ioctl+0x16d3/0x1990 fs/ioctl.c:841
__do_sys_ioctl fs/ioctl.c:905 [inline]
__se_sys_ioctl+0x82/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577
ocfs2_create_local_dquot+0x19d/0x1a40 fs/ocfs2/quota_local.c:1227
ocfs2_acquire_dquot+0x80f/0xb30 fs/ocfs2/quota_global.c:883
dqget+0x7b1/0xf10 fs/quota/dquot.c:977
__dquot_initialize+0x3b3/0xcb0 fs/quota/dquot.c:1505
ocfs2_get_init_inode+0x13b/0x1b0 fs/ocfs2/namei.c:202
ocfs2_mknod+0x863/0x2050 fs/ocfs2/namei.c:310
ocfs2_mkdir+0x191/0x440 fs/ocfs2/namei.c:656
vfs_mkdir+0x306/0x510 fs/namei.c:4375
do_mkdirat+0x247/0x590 fs/namei.c:4408
__do_sys_mkdirat fs/namei.c:4425 [inline]
__se_sys_mkdirat fs/namei.c:4423 [inline]
__x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4423
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&dquot->dq_lock){+.+.}-{4:4}:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
__mutex_lock_common kernel/locking/mutex.c:602 [inline]
__mutex_lock+0x182/0xe80 kernel/locking/mutex.c:747
dquot_release+0x66/0x600 fs/quota/dquot.c:531
ext4_release_dquot+0x3ee/0x6c0 fs/ext4/ext4_jbd2.h:-1
quota_release_workfn+0x35f/0x610 fs/quota/dquot.c:840
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #0 (sb_internal){++++}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3168 [inline]
check_prevs_add kernel/locking/lockdep.c:3287 [inline]
validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911
__lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
percpu_down_write+0x54/0x330 kernel/locking/percpu-rwsem.c:232
sb_wait_write fs/super.c:1900 [inline]
freeze_super+0x8b7/0x1130 fs/super.c:2183
fs_bdev_freeze+0x1a3/0x310 fs/super.c:1529
bdev_freeze+0xd5/0x220 block/bdev.c:298
ext4_force_shutdown+0x322/0x560 fs/ext4/ioctl.c:822
ext4_ioctl_shutdown fs/ext4/ioctl.c:857 [inline]
__ext4_ioctl fs/ext4/ioctl.c:1587 [inline]
ext4_ioctl+0x1d39/0x3510 fs/ext4/ioctl.c:1626
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
sb_internal --> &mm->mmap_lock --> sb_pagefaults
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(sb_pagefaults);
lock(&mm->mmap_lock);
lock(sb_pagefaults);
lock(sb_internal);
*** DEADLOCK ***
4 locks held by syz.5.353/9178:
#0: ffff888148d45230 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:289
#1: ffff88802f9ea428 (sb_writers#4){++++}-{0:0}, at: sb_wait_write fs/super.c:1900 [inline]
#1: ffff88802f9ea428 (sb_writers#4){++++}-{0:0}, at: freeze_super+0x4db/0x1130 fs/super.c:2164
#2: ffff88802f9ea0e0 (&type->s_umount_key#30){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#2: ffff88802f9ea0e0 (&type->s_umount_key#30){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#2: ffff88802f9ea0e0 (&type->s_umount_key#30){++++}-{4:4}, at: freeze_super+0x4e3/0x1130 fs/super.c:2165
#3: ffff88802f9ea520 (sb_pagefaults){++++}-{0:0}, at: sb_wait_write fs/super.c:1900 [inline]
#3: ffff88802f9ea520 (sb_pagefaults){++++}-{0:0}, at: freeze_super+0x50a/0x1130 fs/super.c:2169
stack backtrace:
CPU: 1 UID: 0 PID: 9178 Comm: syz.5.353 Not tainted 6.16.0-rc3-syzkaller-00190-g67a993863163 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2046
check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2178
check_prev_add kernel/locking/lockdep.c:3168 [inline]
check_prevs_add kernel/locking/lockdep.c:3287 [inline]
validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911
__lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
percpu_down_write+0x54/0x330 kernel/locking/percpu-rwsem.c:232
sb_wait_write fs/super.c:1900 [inline]
freeze_super+0x8b7/0x1130 fs/super.c:2183
fs_bdev_freeze+0x1a3/0x310 fs/super.c:1529
bdev_freeze+0xd5/0x220 block/bdev.c:298
ext4_force_shutdown+0x322/0x560 fs/ext4/ioctl.c:822
ext4_ioctl_shutdown fs/ext4/ioctl.c:857 [inline]
__ext4_ioctl fs/ext4/ioctl.c:1587 [inline]
ext4_ioctl+0x1d39/0x3510 fs/ext4/ioctl.c:1626
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f62c818e929
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:00007f62c8fcc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f62c83b5fa0 RCX: 00007f62c818e929
RDX: 0000200000000080 RSI: 000000008004587d RDI: 0000000000000005
RBP: 00007f62c8210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f62c83b5fa0 R15: 00007ffea0f3d678
</TASK>