======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc7-syzkaller-00067-g76b6905c11fd #0 Not tainted
------------------------------------------------------
kswapd0/80 is trying to acquire lock:
ffff888012af6018 (&xfs_dir_ilock_class){++++}-{4:4}, at: xfs_reclaim_inode fs/xfs/xfs_icache.c:1037 [inline]
ffff888012af6018 (&xfs_dir_ilock_class){++++}-{4:4}, at: xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1729 [inline]
ffff888012af6018 (&xfs_dir_ilock_class){++++}-{4:4}, at: xfs_icwalk_ag+0x1211/0x1ac0 fs/xfs/xfs_icache.c:1811
but task is already holding lock:
ffffffff8ec3a6c0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6886 [inline]
ffffffff8ec3a6c0 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0xb9f/0x3b10 mm/vmscan.c:7264
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (fs_reclaim){+.+.}-{0:0}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__fs_reclaim_acquire mm/page_alloc.c:3853 [inline]
fs_reclaim_acquire+0x88/0x130 mm/page_alloc.c:3867
might_alloc include/linux/sched/mm.h:318 [inline]
slab_pre_alloc_hook mm/slub.c:4066 [inline]
slab_alloc_node mm/slub.c:4144 [inline]
kmem_cache_alloc_node_noprof+0x48/0x380 mm/slub.c:4216
__alloc_skb+0x1c3/0x440 net/core/skbuff.c:596
alloc_skb include/linux/skbuff.h:1331 [inline]
alloc_uevent_skb+0x74/0x230 lib/kobject_uevent.c:289
uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline]
kobject_uevent_net_broadcast+0x2fd/0x580 lib/kobject_uevent.c:410
kobject_uevent_env+0x57d/0x8e0 lib/kobject_uevent.c:608
kobject_synth_uevent+0x4ef/0xae0 lib/kobject_uevent.c:207
bus_uevent_store+0x116/0x170 drivers/base/bus.c:832
kernfs_fop_write_iter+0x3a0/0x500 fs/kernfs/file.c:334
new_sync_write fs/read_write.c:586 [inline]
vfs_write+0xacf/0xd10 fs/read_write.c:679
ksys_write+0x18f/0x2b0 fs/read_write.c:731
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #3 (uevent_sock_mutex){+.+.}-{4:4}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730
uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline]
kobject_uevent_net_broadcast+0x280/0x580 lib/kobject_uevent.c:410
kobject_uevent_env+0x57d/0x8e0 lib/kobject_uevent.c:608
loop_set_size drivers/block/loop.c:235 [inline]
loop_set_status+0x4f8/0x800 drivers/block/loop.c:1292
lo_ioctl+0xce6/0x2870
blkdev_ioctl+0x5d0/0x6f0 block/ioctl.c:693
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (&q->q_usage_counter(io)#17){++++}-{0:0}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
bio_queue_enter block/blk.h:78 [inline]
blk_mq_submit_bio+0x14e1/0x25d0 block/blk-mq.c:3091
__submit_bio+0x2cf/0x6a0 block/blk-core.c:628
__submit_bio_noacct_mq block/blk-core.c:715 [inline]
submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:744
xlog_state_release_iclog+0x41d/0x7b0 fs/xfs/xfs_log.c:567
xlog_force_iclog fs/xfs/xfs_log.c:802 [inline]
xlog_force_and_check_iclog fs/xfs/xfs_log.c:2864 [inline]
xfs_log_force+0x616/0x960 fs/xfs/xfs_log.c:2941
xfs_qm_dqflush+0x9ae/0x1130 fs/xfs/xfs_dquot.c:1463
xfs_qm_flush_one+0x295/0x490 fs/xfs/xfs_qm.c:1537
xfs_qm_dquot_walk+0x232/0x4a0 fs/xfs/xfs_qm.c:90
xfs_qm_quotacheck+0x357/0x6f0 fs/xfs/xfs_qm.c:1615
xfs_qm_mount_quotas+0x38f/0x680 fs/xfs/xfs_qm.c:1739
xfs_mountfs+0x1f3d/0x2500 fs/xfs/xfs_mount.c:1041
xfs_fs_fill_super+0x1223/0x1550 fs/xfs/xfs_super.c:1817
get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636
vfs_get_tree+0x90/0x2b0 fs/super.c:1814
do_new_mount+0x2be/0xb40 fs/namespace.c:3560
do_mount fs/namespace.c:3900 [inline]
__do_sys_mount fs/namespace.c:4111 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&dqp->q_qlock){+.+.}-{4:4}:
reacquire_held_locks+0x3eb/0x690 kernel/locking/lockdep.c:5376
__lock_release kernel/locking/lockdep.c:5565 [inline]
lock_release+0x396/0xa30 kernel/locking/lockdep.c:5872
__mutex_unlock_slowpath+0xec/0x800 kernel/locking/mutex.c:891
xfs_qm_dqget_cache_lookup+0x340/0x8b0 fs/xfs/xfs_dquot.c:829
xfs_qm_dqget_inode+0x308/0xb40 fs/xfs/xfs_dquot.c:1022
xfs_qm_dqattach_one+0x17d/0x610 fs/xfs/xfs_qm.c:320
xfs_qm_dqattach_locked+0x41b/0x530 fs/xfs/xfs_qm.c:374
xfs_qm_vop_dqalloc+0x3fd/0xef0 fs/xfs/xfs_qm.c:1978
xfs_icreate_dqalloc+0x311/0x360 fs/xfs/xfs_inode.c:643
xfs_create+0x4be/0xf50 fs/xfs/xfs_inode.c:678
xfs_generic_create+0x5d5/0xf50 fs/xfs/xfs_iops.c:215
lookup_open fs/namei.c:3651 [inline]
open_last_lookups fs/namei.c:3750 [inline]
path_openat+0x193c/0x3590 fs/namei.c:3986
do_filp_open+0x27f/0x4e0 fs/namei.c:4016
do_sys_openat2+0x13e/0x1d0 fs/open.c:1428
do_sys_open fs/open.c:1443 [inline]
__do_sys_openat fs/open.c:1459 [inline]
__se_sys_openat fs/open.c:1454 [inline]
__x64_sys_openat+0x247/0x2a0 fs/open.c:1454
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&xfs_dir_ilock_class){++++}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
down_write_nested+0xa2/0x220 kernel/locking/rwsem.c:1693
xfs_reclaim_inode fs/xfs/xfs_icache.c:1037 [inline]
xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1729 [inline]
xfs_icwalk_ag+0x1211/0x1ac0 fs/xfs/xfs_icache.c:1811
xfs_icwalk fs/xfs/xfs_icache.c:1859 [inline]
xfs_reclaim_inodes_nr+0x2b0/0x390 fs/xfs/xfs_icache.c:1103
super_cache_scan+0x40f/0x4b0 fs/super.c:227
do_shrink_slab+0x72d/0x1160 mm/shrinker.c:437
shrink_slab+0x1093/0x14d0 mm/shrinker.c:664
shrink_one+0x43b/0x850 mm/vmscan.c:4868
shrink_many mm/vmscan.c:4929 [inline]
lru_gen_shrink_node mm/vmscan.c:5007 [inline]
shrink_node+0x379b/0x3e20 mm/vmscan.c:5978
kswapd_shrink_node mm/vmscan.c:6807 [inline]
balance_pgdat mm/vmscan.c:6999 [inline]
kswapd+0x20f3/0x3b10 mm/vmscan.c:7264
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
other info that might help us debug this:
Chain exists of:
&xfs_dir_ilock_class --> uevent_sock_mutex --> fs_reclaim
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(fs_reclaim);
lock(uevent_sock_mutex);
lock(fs_reclaim);
lock(&xfs_dir_ilock_class);
*** DEADLOCK ***
2 locks held by kswapd0/80:
#0: ffffffff8ec3a6c0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6886 [inline]
#0: ffffffff8ec3a6c0 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0xb9f/0x3b10 mm/vmscan.c:7264
#1: ffff888037dda0e0 (&type->s_umount_key#49){.+.+}-{4:4}, at: super_trylock_shared fs/super.c:562 [inline]
#1: ffff888037dda0e0 (&type->s_umount_key#49){.+.+}-{4:4}, at: super_cache_scan+0x94/0x4b0 fs/super.c:196
stack backtrace:
CPU: 0 UID: 0 PID: 80 Comm: kswapd0 Not tainted 6.14.0-rc7-syzkaller-00067-g76b6905c11fd #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:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
down_write_nested+0xa2/0x220 kernel/locking/rwsem.c:1693
xfs_reclaim_inode fs/xfs/xfs_icache.c:1037 [inline]
xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1729 [inline]
xfs_icwalk_ag+0x1211/0x1ac0 fs/xfs/xfs_icache.c:1811
xfs_icwalk fs/xfs/xfs_icache.c:1859 [inline]
xfs_reclaim_inodes_nr+0x2b0/0x390 fs/xfs/xfs_icache.c:1103
super_cache_scan+0x40f/0x4b0 fs/super.c:227
do_shrink_slab+0x72d/0x1160 mm/shrinker.c:437
shrink_slab+0x1093/0x14d0 mm/shrinker.c:664
shrink_one+0x43b/0x850 mm/vmscan.c:4868
shrink_many mm/vmscan.c:4929 [inline]
lru_gen_shrink_node mm/vmscan.c:5007 [inline]
shrink_node+0x379b/0x3e20 mm/vmscan.c:5978
kswapd_shrink_node mm/vmscan.c:6807 [inline]
balance_pgdat mm/vmscan.c:6999 [inline]
kswapd+0x20f3/0x3b10 mm/vmscan.c:7264
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>