Hi
I found this warning with blktests block/005 on upstream kernel
6.15.0-rc4, please help check it and let me know if you need any
info/test, thanks.
[ 942.528228] run blktests block/005 at 2025-04-29 14:22:12
[ 943.169303]
[ 943.170811] ======================================================
[ 943.176990] WARNING: possible circular locking dependency detected
[ 943.183172] 6.15.0-rc4 #1 Not tainted
[ 943.186845] ------------------------------------------------------
[ 943.193022] check/13135 is trying to acquire lock:
[ 943.197817] ffff888119e53018 (&q->elevator_lock){+.+.}-{4:4}, at:
elv_iosched_store+0x194/0x530
[ 943.206536]
[ 943.206536] but task is already holding lock:
[ 943.212366] ffff888119e52a90
(&q->q_usage_counter(io)#10){++++}-{0:0}, at:
blk_mq_freeze_queue_nomemsave+0xe/0x20
[ 943.222645]
[ 943.222645] which lock already depends on the new lock.
[ 943.222645]
[ 943.230817]
[ 943.230817] the existing dependency chain (in reverse order) is:
[ 943.238296]
[ 943.238296] -> #2 (&q->q_usage_counter(io)#10){++++}-{0:0}:
[ 943.245361] __lock_acquire+0x573/0xc00
[ 943.249729] lock_acquire.part.0+0xb6/0x240
[ 943.254441] blk_alloc_queue+0x5c5/0x710
[ 943.258890] blk_mq_alloc_queue+0x14c/0x230
[ 943.263604] __blk_mq_alloc_disk+0x15/0xd0
[ 943.268224] nvme_alloc_ns+0x208/0x1690 [nvme_core]
[ 943.273649] nvme_scan_ns+0x360/0x4b0 [nvme_core]
[ 943.278900] async_run_entry_fn+0x96/0x4f0
[ 943.283527] process_one_work+0x8cd/0x1950
[ 943.288155] worker_thread+0x58d/0xcf0
[ 943.292429] kthread+0x3d8/0x7a0
[ 943.296188] ret_from_fork+0x30/0x70
[ 943.300288] ret_from_fork_asm+0x1a/0x30
[ 943.304743]
[ 943.304743] -> #1 (fs_reclaim){+.+.}-{0:0}:
[ 943.310418] __lock_acquire+0x573/0xc00
[ 943.314779] lock_acquire.part.0+0xb6/0x240
[ 943.319492] fs_reclaim_acquire+0x103/0x150
[ 943.324207] kmem_cache_alloc_noprof+0x4f/0x4c0
[ 943.329259] __kernfs_new_node+0xcb/0x7a0
[ 943.333791] kernfs_new_node+0xef/0x1e0
[ 943.338153] kernfs_create_dir_ns+0x27/0x150
[ 943.342954] sysfs_create_dir_ns+0x11c/0x260
[ 943.347755] kobject_add_internal+0x272/0x890
[ 943.352643] kobject_add+0x11f/0x1f0
[ 943.356750] elv_register_queue+0xb7/0x220
[ 943.361368] blk_register_queue+0x347/0x4e0
[ 943.366074] add_disk_fwnode+0x795/0x10c0
[ 943.370609] sd_probe+0x826/0xdb0 [sd_mod]
[ 943.375247] really_probe+0x1e3/0x920
[ 943.379438] __driver_probe_device+0x18a/0x3d0
[ 943.384403] driver_probe_device+0x49/0x120
[ 943.389110] __driver_attach_async_helper+0x102/0x260
[ 943.394682] async_run_entry_fn+0x96/0x4f0
[ 943.399303] process_one_work+0x8cd/0x1950
[ 943.403931] worker_thread+0x58d/0xcf0
[ 943.408213] kthread+0x3d8/0x7a0
[ 943.411972] ret_from_fork+0x30/0x70
[ 943.416073] ret_from_fork_asm+0x1a/0x30
[ 943.420527]
[ 943.420527] -> #0 (&q->elevator_lock){+.+.}-{4:4}:
[ 943.426809] check_prev_add+0xf1/0xce0
[ 943.431092] validate_chain+0x470/0x580
[ 943.435457] __lock_acquire+0x573/0xc00
[ 943.439817] lock_acquire.part.0+0xb6/0x240
[ 943.444523] __mutex_lock+0x17b/0x1690
[ 943.448805] elv_iosched_store+0x194/0x530
[ 943.453423] queue_attr_store+0x232/0x2f0
[ 943.457955] kernfs_fop_write_iter+0x357/0x530
[ 943.462922] vfs_write+0x9bc/0xf60
[ 943.466858] ksys_write+0xf3/0x1d0
[ 943.470791] do_syscall_64+0x8c/0x180
[ 943.474985] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 943.480559]
[ 943.480559] other info that might help us debug this:
[ 943.480559]
[ 943.488557] Chain exists of:
[ 943.488557] &q->elevator_lock --> fs_reclaim --> &q->q_usage_counter(io)#10
[ 943.488557]
[ 943.500050] Possible unsafe locking scenario:
[ 943.500050]
[ 943.505968] CPU0 CPU1
[ 943.510500] ---- ----
[ 943.515032] lock(&q->q_usage_counter(io)#10);
[ 943.519574] lock(fs_reclaim);
[ 943.525241] lock(&q->q_usage_counter(io)#10);
[ 943.532296] lock(&q->elevator_lock);
[ 943.536058]
[ 943.536058] *** DEADLOCK ***
[ 943.536058]
[ 943.541977] 5 locks held by check/13135:
[ 943.545905] #0: ffff88827c452440 (sb_writers#4){.+.+}-{0:0}, at:
ksys_write+0xf3/0x1d0
[ 943.553928] #1: ffff88825891f090 (&of->mutex#2){+.+.}-{4:4}, at:
kernfs_fop_write_iter+0x216/0x530
[ 943.562993] #2: ffff888171c18e90 (kn->active#85){.+.+}-{0:0}, at:
kernfs_fop_write_iter+0x239/0x530
[ 943.572146] #3: ffff888119e52a90
(&q->q_usage_counter(io)#10){++++}-{0:0}, at:
blk_mq_freeze_queue_nomemsave+0xe/0x20
[ 943.582857] #4: ffff888119e52ad0
(&q->q_usage_counter(queue)#10){+.+.}-{0:0}, at:
blk_mq_freeze_queue_nomemsave+0xe/0x20
[ 943.593829]
[ 943.593829] stack backtrace:
[ 943.598189] CPU: 7 UID: 0 PID: 13135 Comm: check Not tainted
6.15.0-rc4 #1 PREEMPT(voluntary)
[ 943.598195] Hardware name: Dell Inc. PowerEdge R6515/07PXPY, BIOS
2.17.0 12/04/2024
[ 943.598199] Call Trace:
[ 943.598203] <TASK>
[ 943.598207] dump_stack_lvl+0x7e/0xc0
[ 943.598215] print_circular_bug+0xdc/0xf0
[ 943.598224] check_noncircular+0x131/0x150
[ 943.598229] ? __lock_acquire+0x573/0xc00
[ 943.598244] check_prev_add+0xf1/0xce0
[ 943.598249] ? srso_return_thunk+0x5/0x5f
[ 943.598254] ? add_chain_cache+0x111/0x320
[ 943.598263] validate_chain+0x470/0x580
[ 943.598269] ? srso_return_thunk+0x5/0x5f
[ 943.598279] __lock_acquire+0x573/0xc00
[ 943.598291] lock_acquire.part.0+0xb6/0x240
[ 943.598298] ? elv_iosched_store+0x194/0x530
[ 943.598306] ? srso_return_thunk+0x5/0x5f
[ 943.598310] ? rcu_is_watching+0x11/0xb0
[ 943.598317] ? srso_return_thunk+0x5/0x5f
[ 943.598321] ? lock_acquire+0x10e/0x160
[ 943.598330] __mutex_lock+0x17b/0x1690
[ 943.598336] ? elv_iosched_store+0x194/0x530
[ 943.598340] ? srso_return_thunk+0x5/0x5f
[ 943.598344] ? local_clock_noinstr+0x9/0xc0
[ 943.598352] ? __lock_release+0x1a2/0x2c0
[ 943.598356] ? elv_iosched_store+0x194/0x530
[ 943.598363] ? srso_return_thunk+0x5/0x5f
[ 943.598367] ? mark_held_locks+0x50/0x80
[ 943.598375] ? __pfx___mutex_lock+0x10/0x10
[ 943.598381] ? srso_return_thunk+0x5/0x5f
[ 943.598384] ? _raw_spin_unlock_irqrestore+0x42/0x70
[ 943.598394] ? blk_mq_freeze_queue_wait+0x126/0x130
[ 943.598399] ? __pfx_blk_mq_freeze_queue_wait+0x10/0x10
[ 943.598407] ? __pfx_autoremove_wake_function+0x10/0x10
[ 943.598422] ? elv_iosched_store+0x194/0x530
[ 943.598426] elv_iosched_store+0x194/0x530
[ 943.598434] ? __pfx_elv_iosched_store+0x10/0x10
[ 943.598441] ? srso_return_thunk+0x5/0x5f
[ 943.598445] ? rcu_is_watching+0x11/0xb0
[ 943.598450] ? srso_return_thunk+0x5/0x5f
[ 943.598459] queue_attr_store+0x232/0x2f0
[ 943.598467] ? __pfx_queue_attr_store+0x10/0x10
[ 943.598477] ? srso_return_thunk+0x5/0x5f
[ 943.598482] ? srso_return_thunk+0x5/0x5f
[ 943.598486] ? find_held_lock+0x32/0x90
[ 943.598491] ? local_clock_noinstr+0x9/0xc0
[ 943.598497] ? srso_return_thunk+0x5/0x5f
[ 943.598501] ? __lock_release+0x1a2/0x2c0
[ 943.598509] ? sysfs_file_kobj+0xb5/0x1c0
[ 943.598516] ? srso_return_thunk+0x5/0x5f
[ 943.598522] ? srso_return_thunk+0x5/0x5f
[ 943.598525] ? sysfs_file_kobj+0xbf/0x1c0
[ 943.598531] ? srso_return_thunk+0x5/0x5f
[ 943.598539] ? __pfx_sysfs_kf_write+0x10/0x10
[ 943.598544] kernfs_fop_write_iter+0x357/0x530
[ 943.598554] vfs_write+0x9bc/0xf60
[ 943.598560] ? __lock_acquire+0x573/0xc00
[ 943.598568] ? __pfx_vfs_write+0x10/0x10
[ 943.598577] ? __print_lock_name+0xa2/0x100
[ 943.598588] ? find_held_lock+0x32/0x90
[ 943.598593] ? local_clock_noinstr+0x9/0xc0
[ 943.598599] ? srso_return_thunk+0x5/0x5f
[ 943.598608] ksys_write+0xf3/0x1d0
[ 943.598614] ? __pfx_ksys_write+0x10/0x10
[ 943.598618] ? srso_return_thunk+0x5/0x5f
[ 943.598632] do_syscall_64+0x8c/0x180
[ 943.598641] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 943.598646] RIP: 0033:0x7fc1f3efdf77
[ 943.598651] Code: 0f 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7
0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00
00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89
74 24
[ 943.598655] RSP: 002b:00007fff8b39da28 EFLAGS: 00000246 ORIG_RAX:
0000000000000001
[ 943.598661] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007fc1f3efdf77
[ 943.598664] RDX: 0000000000000006 RSI: 00005597f8e81690 RDI: 0000000000000001
[ 943.598667] RBP: 00005597f8e81690 R08: 0000000000000000 R09: 00007fc1f3fb0d40
[ 943.598670] R10: 00007fc1f3fb0c40 R11: 0000000000000246 R12: 0000000000000006
[ 943.598673] R13: 00007fc1f3ffa780 R14: 0000000000000006 R15: 00007fc1f3ff59e0
[ 943.598691] </TASK>
--
Best Regards,
Yi Zhang
