======================================================
WARNING: possible circular locking dependency detected
6.10.0-rc4-syzkaller-00148-g50736169ecc8 #0 Not tainted
------------------------------------------------------
syz-executor.0/7835 is trying to acquire lock:
ffff88805d7d9870 (&fs_info->qgroup_ioctl_lock){+.+.}-{3:3}, at: btrfs_quota_enable+0x3a1/0x1ef0 fs/btrfs/qgroup.c:1086
but task is already holding lock:
ffff88805d7da418 (btrfs_trans_num_extwriters){++++}-{0:0}
, at: join_transaction+0x137/0xf40 fs/btrfs/transaction.c:314
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (btrfs_trans_num_extwriters){++++}-{0:0}:
join_transaction+0x164/0xf40 fs/btrfs/transaction.c:315
start_transaction+0x427/0x1a70 fs/btrfs/transaction.c:700
flush_space+0x8ed/0xdd0 fs/btrfs/space-info.c:778
btrfs_async_reclaim_metadata_space+0x3cd/0x980 fs/btrfs/space-info.c:1088
process_one_work+0x958/0x1ad0 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #2 (btrfs_trans_num_writers){++++}-{0:0}:
__lock_release kernel/locking/lockdep.c:5468 [inline]
lock_release+0x33e/0x6c0 kernel/locking/lockdep.c:5774
percpu_up_read include/linux/percpu-rwsem.h:99 [inline]
__sb_end_write include/linux/fs.h:1650 [inline]
sb_end_intwrite include/linux/fs.h:1767 [inline]
__btrfs_end_transaction+0x5ca/0x920 fs/btrfs/transaction.c:1071
btrfs_commit_inode_delayed_inode+0x228/0x330 fs/btrfs/delayed-inode.c:1301
btrfs_evict_inode+0x960/0xe80 fs/btrfs/inode.c:5291
evict+0x2ed/0x6c0 fs/inode.c:667
iput_final fs/inode.c:1741 [inline]
iput.part.0+0x5a8/0x7f0 fs/inode.c:1767
iput+0x5c/0x80 fs/inode.c:1757
dentry_unlink_inode+0x295/0x480 fs/dcache.c:400
__dentry_kill+0x1d0/0x600 fs/dcache.c:603
dput.part.0+0x4b1/0x9b0 fs/dcache.c:845
dput+0x1f/0x30 fs/dcache.c:835
ovl_destroy_inode+0x3e/0x190 fs/overlayfs/super.c:181
destroy_inode+0xc4/0x1b0 fs/inode.c:311
iput_final fs/inode.c:1741 [inline]
iput.part.0+0x5a8/0x7f0 fs/inode.c:1767
iput+0x5c/0x80 fs/inode.c:1757
dentry_unlink_inode+0x295/0x480 fs/dcache.c:400
__dentry_kill+0x1d0/0x600 fs/dcache.c:603
shrink_kill fs/dcache.c:1048 [inline]
shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1075
prune_dcache_sb+0xeb/0x150 fs/dcache.c:1156
super_cache_scan+0x32a/0x550 fs/super.c:221
do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435
shrink_slab_memcg mm/shrinker.c:548 [inline]
shrink_slab+0xa87/0x1310 mm/shrinker.c:626
shrink_one+0x493/0x7c0 mm/vmscan.c:4790
shrink_many mm/vmscan.c:4851 [inline]
lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4951
shrink_node mm/vmscan.c:5910 [inline]
kswapd_shrink_node mm/vmscan.c:6720 [inline]
balance_pgdat+0x1105/0x1970 mm/vmscan.c:6911
kswapd+0x5ea/0xbf0 mm/vmscan.c:7180
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #1 (fs_reclaim){+.+.}-{0:0}:
__fs_reclaim_acquire mm/page_alloc.c:3801 [inline]
fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3815
might_alloc include/linux/sched/mm.h:334 [inline]
slab_pre_alloc_hook mm/slub.c:3891 [inline]
slab_alloc_node mm/slub.c:3981 [inline]
kmalloc_trace_noprof+0x51/0x310 mm/slub.c:4148
kmalloc_noprof include/linux/slab.h:660 [inline]
ulist_alloc+0x77/0x1c0 fs/btrfs/ulist.c:98
btrfs_quota_enable+0x342/0x1ef0 fs/btrfs/qgroup.c:1051
btrfs_ioctl_quota_ctl fs/btrfs/ioctl.c:3765 [inline]
btrfs_ioctl+0x6af4/0x8290 fs/btrfs/ioctl.c:4762
__do_compat_sys_ioctl+0x2c3/0x330 fs/ioctl.c:1007
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
-> #0 (&fs_info->qgroup_ioctl_lock){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752
btrfs_quota_enable+0x3a1/0x1ef0 fs/btrfs/qgroup.c:1086
btrfs_ioctl_quota_ctl fs/btrfs/ioctl.c:3765 [inline]
btrfs_ioctl+0x6af4/0x8290 fs/btrfs/ioctl.c:4762
__do_compat_sys_ioctl+0x2c3/0x330 fs/ioctl.c:1007
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
other info that might help us debug this:
Chain exists of:
&fs_info->qgroup_ioctl_lock --> btrfs_trans_num_writers --> btrfs_trans_num_extwriters
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
rlock(btrfs_trans_num_extwriters);
lock(btrfs_trans_num_writers);
lock(btrfs_trans_num_extwriters);
lock(&fs_info->qgroup_ioctl_lock);
*** DEADLOCK ***
5 locks held by syz-executor.0/7835:
#0: ffff88805dd94420 (sb_writers#12){.+.+}-{0:0}, at: btrfs_ioctl_quota_ctl fs/btrfs/ioctl.c:3751 [inline]
#0: ffff88805dd94420 (sb_writers#12){.+.+}-{0:0}, at: btrfs_ioctl+0x20a0/0x8290 fs/btrfs/ioctl.c:4762
#1: ffff88805d7d8bd0 (&fs_info->subvol_sem){+.+.}-{3:3}, at: btrfs_ioctl_quota_ctl fs/btrfs/ioctl.c:3764 [inline]
#1: ffff88805d7d8bd0 (&fs_info->subvol_sem){+.+.}-{3:3}, at: btrfs_ioctl+0x6ae9/0x8290 fs/btrfs/ioctl.c:4762
#2: ffff88805dd94610 (sb_internal#2){.+.+}-{0:0}, at: btrfs_quota_enable+0x392/0x1ef0 fs/btrfs/qgroup.c:1084
#3: ffff88805d7da3f0 (btrfs_trans_num_writers){++++}-{0:0}, at: join_transaction+0x137/0xf40 fs/btrfs/transaction.c:314
#4: ffff88805d7da418 (btrfs_trans_num_extwriters){++++}-{0:0}, at: join_transaction+0x137/0xf40 fs/btrfs/transaction.c:314
stack backtrace:
CPU: 1 PID: 7835 Comm: syz-executor.0 Not tainted 6.10.0-rc4-syzkaller-00148-g50736169ecc8 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752
btrfs_quota_enable+0x3a1/0x1ef0 fs/btrfs/qgroup.c:1086
btrfs_ioctl_quota_ctl fs/btrfs/ioctl.c:3765 [inline]
btrfs_ioctl+0x6af4/0x8290 fs/btrfs/ioctl.c:4762
__do_compat_sys_ioctl+0x2c3/0x330 fs/ioctl.c:1007
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7325579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f5f175ac EFLAGS: 00000292 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000c0109428
RDX: 0000000020000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi