======================================================
WARNING: possible circular locking dependency detected
6.13.0-syzkaller-05001-gd0d106a2bd21 #0 Not tainted
------------------------------------------------------
syz.3.66/6304 is trying to acquire lock:
ffff88803456aa00 (&lp->qli_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff88803456aa00 (&lp->qli_lock){+.+.}-{3:3}, at: xfs_dquot_detach_buf+0x2f/0x1b0 fs/xfs/xfs_dquot.c:83
but task is already holding lock:
ffff888030101030 (&l->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff888030101030 (&l->lock){+.+.}-{3:3}, at: lock_list_lru_of_memcg+0x24c/0x4d0 mm/list_lru.c:77
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&l->lock){+.+.}-{3:3}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
lock_list_lru_of_memcg+0x24c/0x4d0 mm/list_lru.c:77
list_lru_del+0x58/0x1f0 mm/list_lru.c:202
xfs_buf_stale+0x1f5/0x320 fs/xfs/xfs_buf.c:178
xfs_buf_read_map+0x68d/0xa50 fs/xfs/xfs_buf.c:915
xfs_trans_read_buf_map+0x260/0xab0 fs/xfs/xfs_trans_buf.c:304
xfs_trans_read_buf fs/xfs/xfs_trans.h:213 [inline]
xfs_read_agf+0x2dc/0x630 fs/xfs/libxfs/xfs_alloc.c:3378
xfs_alloc_read_agf+0x196/0xbe0 fs/xfs/libxfs/xfs_alloc.c:3413
xfs_rmapbt_calc_reserves+0x117/0x490 fs/xfs/libxfs/xfs_rmap_btree.c:852
xfs_ag_resv_init+0x201/0x8e0 fs/xfs/libxfs/xfs_ag_resv.c:291
xfs_fs_reserve_ag_blocks+0x90/0x1c0 fs/xfs/xfs_fsops.c:535
xfs_mountfs+0x1b97/0x2410 fs/xfs/xfs_mount.c:1000
xfs_fs_fill_super+0x12db/0x1590 fs/xfs/xfs_super.c:1791
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 (&bp->b_lock){+.+.}-{3:3}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
xfs_buf_rele_cached fs/xfs/xfs_buf.c:1084 [inline]
xfs_buf_rele+0x164/0x15b0 fs/xfs/xfs_buf.c:1151
xfs_dquot_attach_buf+0x33e/0x560 fs/xfs/xfs_dquot.c:1346
xfs_qm_quotacheck_dqadjust+0x13f/0x5e0 fs/xfs/xfs_qm.c:1341
xfs_qm_dqusage_adjust+0x5e1/0x850 fs/xfs/xfs_qm.c:1457
xfs_iwalk_ag_recs+0x4e3/0x820 fs/xfs/xfs_iwalk.c:209
xfs_iwalk_run_callbacks+0x218/0x470 fs/xfs/xfs_iwalk.c:370
xfs_iwalk_ag+0xa9a/0xbb0 fs/xfs/xfs_iwalk.c:476
xfs_iwalk_ag_work+0xfb/0x1b0 fs/xfs/xfs_iwalk.c:625
xfs_pwork_work+0x7f/0x190 fs/xfs/xfs_pwork.c:47
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317
worker_thread+0x870/0xd30 kernel/workqueue.c:3398
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
-> #0 (&lp->qli_lock){+.+.}-{3:3}:
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
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
xfs_dquot_detach_buf+0x2f/0x1b0 fs/xfs/xfs_dquot.c:83
xfs_qm_dquot_isolate+0x49d/0x1420 fs/xfs/xfs_qm.c:528
__list_lru_walk_one+0x170/0x470 mm/list_lru.c:300
list_lru_walk_one+0x3c/0x50 mm/list_lru.c:337
list_lru_shrink_walk include/linux/list_lru.h:240 [inline]
xfs_qm_shrink_scan+0x1e1/0x400 fs/xfs/xfs_qm.c:574
do_shrink_slab+0x72d/0x1160 mm/shrinker.c:437
shrink_slab+0x1093/0x14d0 mm/shrinker.c:664
drop_slab_node mm/vmscan.c:421 [inline]
drop_slab+0x142/0x280 mm/vmscan.c:439
drop_caches_sysctl_handler+0xbc/0x160 fs/drop_caches.c:68
proc_sys_call_handler+0x5ec/0x920 fs/proc/proc_sysctl.c:601
do_iter_readv_writev+0x71a/0x9d0
vfs_writev+0x376/0xba0 fs/read_write.c:1050
do_writev+0x1b6/0x360 fs/read_write.c:1096
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
other info that might help us debug this:
Chain exists of:
&lp->qli_lock --> &bp->b_lock --> &l->lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&l->lock);
lock(&bp->b_lock);
lock(&l->lock);
lock(&lp->qli_lock);
*** DEADLOCK ***
4 locks held by syz.3.66/6304:
#0: ffff8880250d6478 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x254/0x320 fs/file.c:1192
#1: ffff88802a194420 (sb_writers#3){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2980 [inline]
#1: ffff88802a194420 (sb_writers#3){.+.+}-{0:0}, at: vfs_writev+0x2d1/0xba0 fs/read_write.c:1048
#2: ffff888030101030 (&l->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
#2: ffff888030101030 (&l->lock){+.+.}-{3:3}, at: lock_list_lru_of_memcg+0x24c/0x4d0 mm/list_lru.c:77
#3: ffff88803456aae8 (&dqp->q_qlock){+.+.}-{4:4}, at: xfs_dqlock_nowait fs/xfs/xfs_dquot.h:126 [inline]
#3: ffff88803456aae8 (&dqp->q_qlock){+.+.}-{4:4}, at: xfs_qm_dquot_isolate+0x8d/0x1420 fs/xfs/xfs_qm.c:467
stack backtrace:
CPU: 1 UID: 0 PID: 6304 Comm: syz.3.66 Not tainted 6.13.0-syzkaller-05001-gd0d106a2bd21 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
xfs_dquot_detach_buf+0x2f/0x1b0 fs/xfs/xfs_dquot.c:83
xfs_qm_dquot_isolate+0x49d/0x1420 fs/xfs/xfs_qm.c:528
__list_lru_walk_one+0x170/0x470 mm/list_lru.c:300
list_lru_walk_one+0x3c/0x50 mm/list_lru.c:337
list_lru_shrink_walk include/linux/list_lru.h:240 [inline]
xfs_qm_shrink_scan+0x1e1/0x400 fs/xfs/xfs_qm.c:574
do_shrink_slab+0x72d/0x1160 mm/shrinker.c:437
shrink_slab+0x1093/0x14d0 mm/shrinker.c:664
drop_slab_node mm/vmscan.c:421 [inline]
drop_slab+0x142/0x280 mm/vmscan.c:439
drop_caches_sysctl_handler+0xbc/0x160 fs/drop_caches.c:68
proc_sys_call_handler+0x5ec/0x920 fs/proc/proc_sysctl.c:601
do_iter_readv_writev+0x71a/0x9d0
vfs_writev+0x376/0xba0 fs/read_write.c:1050
do_writev+0x1b6/0x360 fs/read_write.c:1096
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
RIP: 0033:0x7fcf0438cd29
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:00007fcf052cb038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fcf045a5fa0 RCX: 00007fcf0438cd29
RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000004
RBP: 00007fcf0440e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fcf045a5fa0 R15: 00007ffcdbaceac8
</TASK>
syz.3.66 (6304): drop_caches: 2