------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.7.0-rc2-next-20231121-syzkaller #0 Not tainted
------------------------------------------------------
jbd2/sda1-8/4474 is trying to acquire lock:
ffffffff8cf9aab8 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0x12/0x70 kernel/locking/semaphore.c:139

but task is already holding lock:
ffffffff8da732f8 (pool_rwlock){----}-{2:2}, at: stack_depot_put lib/stackdepot.c:621 [inline]
ffffffff8da732f8 (pool_rwlock){----}-{2:2}, at: stack_depot_put+0x24/0x110 lib/stackdepot.c:613

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (pool_rwlock){----}-{2:2}:
       __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
       _raw_read_lock_irqsave+0x46/0x90 kernel/locking/spinlock.c:236
       stack_depot_save_flags+0x169/0x740 lib/stackdepot.c:508
       kasan_save_stack+0x42/0x50 mm/kasan/common.c:47
       __kasan_record_aux_stack+0xc2/0xd0 mm/kasan/generic.c:508
       task_work_add+0x88/0x2a0 kernel/task_work.c:48
       task_tick_numa kernel/sched/fair.c:3512 [inline]
       task_tick_fair+0x5a5/0xc30 kernel/sched/fair.c:12570
       scheduler_tick+0x210/0x650 kernel/sched/core.c:5674
       update_process_times+0x19e/0x220 kernel/time/timer.c:2076
       tick_sched_handle+0x8e/0x170 kernel/time/tick-sched.c:255
       tick_nohz_highres_handler+0xe9/0x110 kernel/time/tick-sched.c:1516
       __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
       __hrtimer_run_queues+0x654/0xc20 kernel/time/hrtimer.c:1752
       hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814
       local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
       __sysvec_apic_timer_interrupt+0x10c/0x410 arch/x86/kernel/apic/apic.c:1082
       sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076
       asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
       __sanitizer_cov_trace_cmp8+0x4/0x20 kernel/kcov.c:283
       __orc_find+0xc4/0x130 arch/x86/kernel/unwind_orc.c:102
       orc_find arch/x86/kernel/unwind_orc.c:227 [inline]
       unwind_next_frame+0x329/0x2390 arch/x86/kernel/unwind_orc.c:494
       arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25
       stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
       kasan_save_stack+0x33/0x50 mm/kasan/common.c:46
       __kasan_record_aux_stack+0xc2/0xd0 mm/kasan/generic.c:508
       __call_rcu_common.constprop.0+0x9a/0x7a0 kernel/rcu/tree.c:2681
       destroy_inode+0x129/0x1b0 fs/inode.c:314
       iput_final fs/inode.c:1775 [inline]
       iput.part.0+0x570/0x7c0 fs/inode.c:1801
       iput+0x5c/0x80 fs/inode.c:1791
       dentry_unlink_inode+0x292/0x430 fs/dcache.c:401
       __dentry_kill+0x3b8/0x640 fs/dcache.c:607
       shrink_dentry_list+0x11e/0x4a0 fs/dcache.c:1201
       shrink_dcache_parent+0xdf/0x3b0 fs/dcache.c:1652
       do_one_tree fs/dcache.c:1681 [inline]
       shrink_dcache_for_umount+0x79/0x340 fs/dcache.c:1698
       generic_shutdown_super+0x76/0x3d0 fs/super.c:646
       kill_anon_super+0x3a/0x60 fs/super.c:1253
       proc_kill_sb+0x99/0x100 fs/proc/root.c:272
       deactivate_locked_super+0xbc/0x1a0 fs/super.c:487
       deactivate_super+0xde/0x100 fs/super.c:520
       cleanup_mnt+0x222/0x450 fs/namespace.c:1266
       mntput_no_expire+0x81f/0xaf0 fs/namespace.c:1352
       mntput+0x6b/0x90 fs/namespace.c:1362
       __fput+0x3da/0xbb0 fs/file_table.c:405
       task_work_run+0x14c/0x240 kernel/task_work.c:180
       resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
       exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
       exit_to_user_mode_prepare+0x214/0x240 kernel/entry/common.c:204
       __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
       syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296
       ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

-> #2 (&rq->__lock){-.-.}-{2:2}:
       _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:558
       raw_spin_rq_lock kernel/sched/sched.h:1374 [inline]
       rq_lock kernel/sched/sched.h:1688 [inline]
       task_fork_fair+0x70/0x240 kernel/sched/fair.c:12590
       sched_cgroup_fork+0x3cf/0x510 kernel/sched/core.c:4835
       copy_process+0x6a38/0x9770 kernel/fork.c:2601
       kernel_clone+0xfd/0x940 kernel/fork.c:2899
       user_mode_thread+0xb4/0xf0 kernel/fork.c:2977
       rest_init+0x27/0x2b0 init/main.c:695
       arch_call_rest_init+0x13/0x30 init/main.c:827
       start_kernel+0x39e/0x480 init/main.c:1072
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:555
       x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:536
       secondary_startup_64_no_verify+0x166/0x16b

-> #1 (&p->pi_lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:522 [inline]
       try_to_wake_up+0x9a/0x13d0 kernel/sched/core.c:4252
       up+0x79/0xb0 kernel/locking/semaphore.c:191
       __up_console_sem kernel/printk/printk.c:340 [inline]
       __console_unlock kernel/printk/printk.c:2706 [inline]
       console_unlock+0x1cf/0x260 kernel/printk/printk.c:3038
       vprintk_emit+0x17f/0x5f0 kernel/printk/printk.c:2303
       vprintk+0x7b/0x90 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2328
       set_capacity_and_notify+0x1f9/0x2b0 block/genhd.c:86
       loop_set_size drivers/block/loop.c:237 [inline]
       loop_configure+0xddf/0x18b0 drivers/block/loop.c:1100
       lo_ioctl+0x745/0x1a50 drivers/block/loop.c:1550
       blkdev_ioctl+0x2f9/0x770 block/ioctl.c:633
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:871 [inline]
       __se_sys_ioctl fs/ioctl.c:857 [inline]
       __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
       entry_SYSCALL_64_after_hwframe+0x62/0x6a

-> #0 ((console_sem).lock){-.-.}-{2:2}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3868 [inline]
       __lock_acquire+0x2466/0x3b10 kernel/locking/lockdep.c:5136
       lock_acquire kernel/locking/lockdep.c:5753 [inline]
       lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
       down_trylock+0x12/0x70 kernel/locking/semaphore.c:139
       __down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:323
       console_trylock+0x73/0x130 kernel/printk/printk.c:2659
       console_trylock_spinning kernel/printk/printk.c:1923 [inline]
       vprintk_emit+0x162/0x5f0 kernel/printk/printk.c:2302
       vprintk+0x7b/0x90 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2328
       __warn_printk+0x158/0x350 kernel/panic.c:721
       refcount_warn_saturate+0x149/0x210 lib/refcount.c:28
       __refcount_sub_and_test include/linux/refcount.h:283 [inline]
       __refcount_dec_and_test include/linux/refcount.h:315 [inline]
       refcount_dec_and_test include/linux/refcount.h:333 [inline]
       stack_depot_put lib/stackdepot.c:627 [inline]
       stack_depot_put+0xe4/0x110 lib/stackdepot.c:613
       __kasan_record_aux_stack+0xb3/0xd0 mm/kasan/generic.c:506
       insert_work+0x38/0x230 kernel/workqueue.c:1653
       __queue_work+0x633/0x11f0 kernel/workqueue.c:1805
       __queue_delayed_work+0x1bf/0x270 kernel/workqueue.c:1956
       mod_delayed_work_on+0xcc/0x1a0 kernel/workqueue.c:2030
       kblockd_mod_delayed_work_on+0x29/0x40 block/blk-core.c:1038
       blk_kick_flush block/blk-flush.c:348 [inline]
       blk_flush_complete_seq+0xa66/0x10c0 block/blk-flush.c:213
       blk_insert_flush+0x349/0x6d0 block/blk-flush.c:456
       blk_mq_submit_bio+0x16cd/0x2150 block/blk-mq.c:2992
       __submit_bio+0xfd/0x310 block/blk-core.c:599
       __submit_bio_noacct_mq block/blk-core.c:678 [inline]
       submit_bio_noacct_nocheck+0x852/0xbb0 block/blk-core.c:707
       submit_bio_noacct+0x87b/0x1b90 block/blk-core.c:801
       journal_submit_commit_record+0x73b/0xab0 fs/jbd2/commit.c:156
       jbd2_journal_commit_transaction+0x39fd/0x63c0 fs/jbd2/commit.c:880
       kjournald2+0x1f8/0x8f0 fs/jbd2/journal.c:201
       kthread+0x2c1/0x3a0 kernel/kthread.c:388
       ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

other info that might help us debug this:

Chain exists of:
  (console_sem).lock --> &rq->__lock --> pool_rwlock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(pool_rwlock);
                               lock(&rq->__lock);
                               lock(pool_rwlock);
  lock((console_sem).lock);

 *** DEADLOCK ***

4 locks held by jbd2/sda1-8/4474:
 #0: ffff88801ec88318 (&fq->mq_flush_lock){..-.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
 #0: ffff88801ec88318 (&fq->mq_flush_lock){..-.}-{2:2}, at: blk_insert_flush+0x337/0x6d0 block/blk-flush.c:455
 #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #1: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: __queue_work+0xf2/0x11f0 kernel/workqueue.c:1733
 #2: ffff8880b983c2f8 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x38e/0x11f0 kernel/workqueue.c:1766
 #3: ffffffff8da732f8 (pool_rwlock){----}-{2:2}, at: stack_depot_put lib/stackdepot.c:621 [inline]
 #3: ffffffff8da732f8 (pool_rwlock){----}-{2:2}, at: stack_depot_put+0x24/0x110 lib/stackdepot.c:613

stack backtrace:
CPU: 0 PID: 4474 Comm: jbd2/sda1-8 Not tainted 6.7.0-rc2-next-20231121-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 check_noncircular+0x316/0x400 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:3868 [inline]
 __lock_acquire+0x2466/0x3b10 kernel/locking/lockdep.c:5136
 lock_acquire kernel/locking/lockdep.c:5753 [inline]
 lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5718
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
 down_trylock+0x12/0x70 kernel/locking/semaphore.c:139
 __down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:323
 console_trylock+0x73/0x130 kernel/printk/printk.c:2659
 console_trylock_spinning kernel/printk/printk.c:1923 [inline]
 vprintk_emit+0x162/0x5f0 kernel/printk/printk.c:2302
 vprintk+0x7b/0x90 kernel/printk/printk_safe.c:45
 _printk+0xc8/0x100 kernel/printk/printk.c:2328
 __warn_printk+0x158/0x350 kernel/panic.c:721
 refcount_warn_saturate+0x149/0x210 lib/refcount.c:28
 __refcount_sub_and_test include/linux/refcount.h:283 [inline]
 __refcount_dec_and_test include/linux/refcount.h:315 [inline]
 refcount_dec_and_test include/linux/refcount.h:333 [inline]
 stack_depot_put lib/stackdepot.c:627 [inline]
 stack_depot_put+0xe4/0x110 lib/stackdepot.c:613
 __kasan_record_aux_stack+0xb3/0xd0 mm/kasan/generic.c:506
 insert_work+0x38/0x230 kernel/workqueue.c:1653
 __queue_work+0x633/0x11f0 kernel/workqueue.c:1805
 __queue_delayed_work+0x1bf/0x270 kernel/workqueue.c:1956
 mod_delayed_work_on+0xcc/0x1a0 kernel/workqueue.c:2030
 kblockd_mod_delayed_work_on+0x29/0x40 block/blk-core.c:1038
 blk_kick_flush block/blk-flush.c:348 [inline]
 blk_flush_complete_seq+0xa66/0x10c0 block/blk-flush.c:213
 blk_insert_flush+0x349/0x6d0 block/blk-flush.c:456
 blk_mq_submit_bio+0x16cd/0x2150 block/blk-mq.c:2992
 __submit_bio+0xfd/0x310 block/blk-core.c:599
 __submit_bio_noacct_mq block/blk-core.c:678 [inline]
 submit_bio_noacct_nocheck+0x852/0xbb0 block/blk-core.c:707
 submit_bio_noacct+0x87b/0x1b90 block/blk-core.c:801
 journal_submit_commit_record+0x73b/0xab0 fs/jbd2/commit.c:156
 jbd2_journal_commit_transaction+0x39fd/0x63c0 fs/jbd2/commit.c:880
 kjournald2+0x1f8/0x8f0 fs/jbd2/journal.c:201
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 4474 at lib/refcount.c:28 refcount_warn_saturate+0x14a/0x210 lib/refcount.c:28
Modules linked in:
CPU: 0 PID: 4474 Comm: jbd2/sda1-8 Not tainted 6.7.0-rc2-next-20231121-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:refcount_warn_saturate+0x14a/0x210 lib/refcount.c:28
Code: ff 89 de e8 b8 c7 24 fd 84 db 0f 85 66 ff ff ff e8 7b cc 24 fd c6 05 6c 11 a0 0a 01 90 48 c7 c7 20 bf 2e 8b e8 47 c3 ea fc 90 <0f> 0b 90 90 e9 43 ff ff ff e8 58 cc 24 fd 0f b6 1d 47 11 a0 0a 31
RSP: 0018:ffffc9000ddd7300 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff814e05d9
RDX: ffff88807e439dc0 RSI: ffffffff814e05e6 RDI: 0000000000000001
RBP: ffff888089ebc67c R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000021da0 R12: ffff8881436c08c0
R13: ffff8880182e1000 R14: ffff8880182e105c R15: ffff8880b983c340
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc7e006ff8 CR3: 000000007ab79000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:283 [inline]
 __refcount_dec_and_test include/linux/refcount.h:315 [inline]
 refcount_dec_and_test include/linux/refcount.h:333 [inline]
 stack_depot_put lib/stackdepot.c:627 [inline]
 stack_depot_put+0xe4/0x110 lib/stackdepot.c:613
 __kasan_record_aux_stack+0xb3/0xd0 mm/kasan/generic.c:506
 insert_work+0x38/0x230 kernel/workqueue.c:1653
 __queue_work+0x633/0x11f0 kernel/workqueue.c:1805
 __queue_delayed_work+0x1bf/0x270 kernel/workqueue.c:1956
 mod_delayed_work_on+0xcc/0x1a0 kernel/workqueue.c:2030
 kblockd_mod_delayed_work_on+0x29/0x40 block/blk-core.c:1038
 blk_kick_flush block/blk-flush.c:348 [inline]
 blk_flush_complete_seq+0xa66/0x10c0 block/blk-flush.c:213
 blk_insert_flush+0x349/0x6d0 block/blk-flush.c:456
 blk_mq_submit_bio+0x16cd/0x2150 block/blk-mq.c:2992
 __submit_bio+0xfd/0x310 block/blk-core.c:599
 __submit_bio_noacct_mq block/blk-core.c:678 [inline]
 submit_bio_noacct_nocheck+0x852/0xbb0 block/blk-core.c:707
 submit_bio_noacct+0x87b/0x1b90 block/blk-core.c:801
 journal_submit_commit_record+0x73b/0xab0 fs/jbd2/commit.c:156
 jbd2_journal_commit_transaction+0x39fd/0x63c0 fs/jbd2/commit.c:880
 kjournald2+0x1f8/0x8f0 fs/jbd2/journal.c:201
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>