XFS (loop0): Quotacheck needed: Please wait.
XFS (loop0): Quotacheck: Done.
======================================================
WARNING: possible circular locking dependency detected
6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted
------------------------------------------------------
syz-executor.0/15543 is trying to acquire lock:
ffffffff8d928ce0 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline]
ffffffff8d928ce0 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:3746 [inline]
ffffffff8d928ce0 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3827 [inline]
ffffffff8d928ce0 (fs_reclaim){+.+.}-{0:0}, at: kmem_cache_alloc+0x4f/0x320 mm/slub.c:3852
but task is already holding lock:
ffff88802600a958 (&qinf->qi_tree_lock){+.+.}-{3:3}, at: xfs_qm_dqget_cache_insert.constprop.0+0x2a/0x2c0 fs/xfs/xfs_dquot.c:825
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&qinf->qi_tree_lock){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752
xfs_qm_dqget_cache_lookup+0x66/0x820 fs/xfs/xfs_dquot.c:784
xfs_qm_dqget_inode+0x1e7/0x6d0 fs/xfs/xfs_dquot.c:986
xfs_qm_dqattach_one+0x26f/0x530 fs/xfs/xfs_qm.c:278
xfs_qm_dqattach_locked+0x1a8/0x2d0 fs/xfs/xfs_qm.c:345
xfs_qm_vop_dqalloc+0x344/0xe10 fs/xfs/xfs_qm.c:1710
xfs_create+0x422/0x1140 fs/xfs/xfs_inode.c:1041
xfs_generic_create+0x631/0x7c0 fs/xfs/xfs_iops.c:199
lookup_open.isra.0+0x10a1/0x13c0 fs/namei.c:3497
open_last_lookups fs/namei.c:3566 [inline]
path_openat+0x92f/0x2990 fs/namei.c:3796
do_filp_open+0x1dc/0x430 fs/namei.c:3826
do_sys_openat2+0x17a/0x1e0 fs/open.c:1406
do_sys_open fs/open.c:1421 [inline]
__do_sys_open fs/open.c:1429 [inline]
__se_sys_open fs/open.c:1425 [inline]
__x64_sys_open+0x154/0x1e0 fs/open.c:1425
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6d/0x75
-> #1 (&xfs_dir_ilock_class){++++}-{3:3}:
down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1695
xfs_ilock+0x2ef/0x3e0 fs/xfs/xfs_inode.c:206
xfs_reclaim_inode fs/xfs/xfs_icache.c:945 [inline]
xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1631 [inline]
xfs_icwalk_ag+0xca6/0x1740 fs/xfs/xfs_icache.c:1713
xfs_icwalk+0x57/0x100 fs/xfs/xfs_icache.c:1762
xfs_reclaim_inodes_nr+0x182/0x250 fs/xfs/xfs_icache.c:1011
super_cache_scan+0x409/0x550 fs/super.c:227
do_shrink_slab+0x44f/0x1160 mm/shrinker.c:435
shrink_slab+0x18a/0x1310 mm/shrinker.c:662
shrink_one+0x493/0x7b0 mm/vmscan.c:4767
shrink_many mm/vmscan.c:4828 [inline]
lru_gen_shrink_node mm/vmscan.c:4929 [inline]
shrink_node+0x2123/0x3750 mm/vmscan.c:5888
kswapd_shrink_node mm/vmscan.c:6696 [inline]
balance_pgdat+0x9d0/0x1a90 mm/vmscan.c:6886
kswapd+0x5c1/0xc10 mm/vmscan.c:7146
kthread+0x2c1/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
-> #0 (fs_reclaim){+.+.}-{0:0}:
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+0x1b1/0x540 kernel/locking/lockdep.c:5719
__fs_reclaim_acquire mm/page_alloc.c:3692 [inline]
fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:3706
might_alloc include/linux/sched/mm.h:303 [inline]
slab_pre_alloc_hook mm/slub.c:3746 [inline]
slab_alloc_node mm/slub.c:3827 [inline]
kmem_cache_alloc+0x4f/0x320 mm/slub.c:3852
radix_tree_node_alloc.constprop.0+0x7c/0x350 lib/radix-tree.c:276
radix_tree_extend+0x1a2/0x4d0 lib/radix-tree.c:425
__radix_tree_create lib/radix-tree.c:613 [inline]
radix_tree_insert+0x499/0x630 lib/radix-tree.c:712
xfs_qm_dqget_cache_insert.constprop.0+0x38/0x2c0 fs/xfs/xfs_dquot.c:826
xfs_qm_dqget+0x182/0x4a0 fs/xfs/xfs_dquot.c:901
xfs_qm_vop_dqalloc+0x627/0xe10 fs/xfs/xfs_qm.c:1773
xfs_fileattr_set+0x7e8/0x2590 fs/xfs/xfs_ioctl.c:1347
vfs_fileattr_set+0x7cc/0xc00 fs/ioctl.c:697
ioctl_fssetxattr fs/ioctl.c:759 [inline]
do_vfs_ioctl+0x24f/0x1ac0 fs/ioctl.c:873
__do_sys_ioctl fs/ioctl.c:902 [inline]
__se_sys_ioctl fs/ioctl.c:890 [inline]
__x64_sys_ioctl+0x116/0x220 fs/ioctl.c:890
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6d/0x75
other info that might help us debug this:
Chain exists of:
fs_reclaim --> &xfs_dir_ilock_class --> &qinf->qi_tree_lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&qinf->qi_tree_lock);
lock(&xfs_dir_ilock_class);
lock(&qinf->qi_tree_lock);
lock(fs_reclaim);
*** DEADLOCK ***
3 locks held by syz-executor.0/15543:
#0: ffff8880656ec420 (sb_writers#16){.+.+}-{0:0}, at: ioctl_fssetxattr fs/ioctl.c:757 [inline]
#0: ffff8880656ec420 (sb_writers#16){.+.+}-{0:0}, at: do_vfs_ioctl+0x14ef/0x1ac0 fs/ioctl.c:873
#1: ffff88802e6429f8 (&sb->s_type->i_mutex_key#24){++++}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
#1: ffff88802e6429f8 (&sb->s_type->i_mutex_key#24){++++}-{3:3}, at: vfs_fileattr_set+0x153/0xc00 fs/ioctl.c:682
#2: ffff88802600a958 (&qinf->qi_tree_lock){+.+.}-{3:3}, at: xfs_qm_dqget_cache_insert.constprop.0+0x2a/0x2c0 fs/xfs/xfs_dquot.c:825
stack backtrace:
CPU: 1 PID: 15543 Comm: syz-executor.0 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #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+0x1b1/0x540 kernel/locking/lockdep.c:5719
__fs_reclaim_acquire mm/page_alloc.c:3692 [inline]
fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:3706
might_alloc include/linux/sched/mm.h:303 [inline]
slab_pre_alloc_hook mm/slub.c:3746 [inline]
slab_alloc_node mm/slub.c:3827 [inline]
kmem_cache_alloc+0x4f/0x320 mm/slub.c:3852
radix_tree_node_alloc.constprop.0+0x7c/0x350 lib/radix-tree.c:276
radix_tree_extend+0x1a2/0x4d0 lib/radix-tree.c:425
__radix_tree_create lib/radix-tree.c:613 [inline]
radix_tree_insert+0x499/0x630 lib/radix-tree.c:712
xfs_qm_dqget_cache_insert.constprop.0+0x38/0x2c0 fs/xfs/xfs_dquot.c:826
xfs_qm_dqget+0x182/0x4a0 fs/xfs/xfs_dquot.c:901
xfs_qm_vop_dqalloc+0x627/0xe10 fs/xfs/xfs_qm.c:1773
xfs_fileattr_set+0x7e8/0x2590 fs/xfs/xfs_ioctl.c:1347
vfs_fileattr_set+0x7cc/0xc00 fs/ioctl.c:697
ioctl_fssetxattr fs/ioctl.c:759 [inline]
do_vfs_ioctl+0x24f/0x1ac0 fs/ioctl.c:873
__do_sys_ioctl fs/ioctl.c:902 [inline]
__se_sys_ioctl fs/ioctl.c:890 [inline]
__x64_sys_ioctl+0x116/0x220 fs/ioctl.c:890
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f98b547dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f98b61000c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f98b55abf80 RCX: 00007f98b547dda9
RDX: 0000000020000000 RSI: 00000000401c5820 RDI: 0000000000000005
RBP: 00007f98b54ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f98b55abf80 R15: 00007ffc3d4bc918
</TASK>