Warning: Permanently added '10.128.0.145' (ECDSA) to the list of known hosts.
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syzkaller login: [   49.953405][    C1] 
[   49.955843][    C1] ======================================================
[   49.962853][    C1] WARNING: possible circular locking dependency detected
[   49.969862][    C1] 5.19.0-rc4-next-20220628-syzkaller #0 Not tainted
[   49.976443][    C1] ------------------------------------------------------
[   49.983441][    C1] syz-executor358/3597 is trying to acquire lock:
[   49.989866][    C1] ffff888146f83aa0 (&q->queue_lock){..-.}-{2:2}, at: throtl_pending_timer_fn+0xf7/0x1690
[   49.999705][    C1] 
[   49.999705][    C1] but task is already holding lock:
[   50.007054][    C1] ffffc900001e0d70 ((&sq->pending_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x6b0
[   50.016453][    C1] 
[   50.016453][    C1] which lock already depends on the new lock.
[   50.016453][    C1] 
[   50.026887][    C1] 
[   50.026887][    C1] the existing dependency chain (in reverse order) is:
[   50.035910][    C1] 
[   50.035910][    C1] -> #2 ((&sq->pending_timer)){+.-.}-{0:0}:
[   50.044002][    C1]        del_timer_sync+0x5b/0x1b0
[   50.049136][    C1]        throtl_pd_free+0x15/0x40
[   50.054169][    C1]        blkcg_deactivate_policy+0x2d2/0x4e0
[   50.060152][    C1]        blk_throtl_exit+0x8a/0x1a0
[   50.065351][    C1]        blkcg_init_queue+0x19b/0x620
[   50.070722][    C1]        __alloc_disk_node+0x260/0x610
[   50.076182][    C1]        __blk_mq_alloc_disk+0x133/0x1c0
[   50.081810][    C1]        loop_add+0x3e2/0xaf0
[   50.086487][    C1]        loop_control_ioctl+0x133/0x540
[   50.092055][    C1]        __x64_sys_ioctl+0x193/0x200
[   50.097368][    C1]        do_syscall_64+0x35/0xb0
[   50.102317][    C1]        entry_SYSCALL_64_after_hwframe+0x46/0xb0
[   50.108762][    C1] 
[   50.108762][    C1] -> #1 (&blkcg->lock){....}-{2:2}:
[   50.116156][    C1]        _raw_spin_lock+0x2a/0x40
[   50.121209][    C1]        blkg_create+0x45e/0x1000
[   50.126249][    C1]        blkcg_init_queue+0xb2/0x620
[   50.131570][    C1]        __alloc_disk_node+0x260/0x610
[   50.137055][    C1]        __blk_alloc_disk+0x35/0x70
[   50.142267][    C1]        brd_alloc.part.0+0x27f/0x7a0
[   50.147656][    C1]        brd_init+0x1b8/0x24b
[   50.152346][    C1]        do_one_initcall+0xfe/0x650
[   50.157565][    C1]        kernel_init_freeable+0x6b1/0x73a
[   50.163292][    C1]        kernel_init+0x1a/0x1d0
[   50.168168][    C1]        ret_from_fork+0x1f/0x30
[   50.173128][    C1] 
[   50.173128][    C1] -> #0 (&q->queue_lock){..-.}-{2:2}:
[   50.180695][    C1]        __lock_acquire+0x2abe/0x5660
[   50.186072][    C1]        lock_acquire+0x1ab/0x570
[   50.191088][    C1]        _raw_spin_lock_irq+0x32/0x50
[   50.196478][    C1]        throtl_pending_timer_fn+0xf7/0x1690
[   50.202474][    C1]        call_timer_fn+0x1a0/0x6b0
[   50.207587][    C1]        __run_timers.part.0+0x674/0xa80
[   50.213221][    C1]        run_timer_softirq+0xb3/0x1d0
[   50.218591][    C1]        __do_softirq+0x29b/0x9c2
[   50.223610][    C1]        __irq_exit_rcu+0x123/0x180
[   50.228825][    C1]        irq_exit_rcu+0x5/0x20
[   50.233601][    C1]        sysvec_apic_timer_interrupt+0x93/0xc0
[   50.239790][    C1]        asm_sysvec_apic_timer_interrupt+0x1b/0x20
[   50.246303][    C1]        lock_acquire+0x1ef/0x570
[   50.251350][    C1]        _raw_spin_lock+0x2a/0x40
[   50.256400][    C1]        new_inode+0x48/0x270
[   50.261120][    C1]        debugfs_get_inode+0x1a/0x130
[   50.266590][    C1]        debugfs_create_dir+0xdc/0x4d0
[   50.272061][    C1]        bdi_register_va.part.0+0x22d/0x800
[   50.277976][    C1]        bdi_register+0x12a/0x140
[   50.283007][    C1]        device_add_disk+0x83c/0xe20
[   50.288315][    C1]        loop_add+0x884/0xaf0
[   50.292998][    C1]        loop_control_ioctl+0x133/0x540
[   50.298549][    C1]        __x64_sys_ioctl+0x193/0x200
[   50.303853][    C1]        do_syscall_64+0x35/0xb0
[   50.308788][    C1]        entry_SYSCALL_64_after_hwframe+0x46/0xb0
[   50.315197][    C1] 
[   50.315197][    C1] other info that might help us debug this:
[   50.315197][    C1] 
[   50.325412][    C1] Chain exists of:
[   50.325412][    C1]   &q->queue_lock --> &blkcg->lock --> (&sq->pending_timer)
[   50.325412][    C1] 
[   50.338529][    C1]  Possible unsafe locking scenario:
[   50.338529][    C1] 
[   50.345967][    C1]        CPU0                    CPU1
[   50.351317][    C1]        ----                    ----
[   50.356670][    C1]   lock((&sq->pending_timer));
[   50.361513][    C1]                                lock(&blkcg->lock);
[   50.368203][    C1]                                lock((&sq->pending_timer));
[   50.375565][    C1]   lock(&q->queue_lock);
[   50.379888][    C1] 
[   50.379888][    C1]  *** DEADLOCK ***
[   50.379888][    C1] 
[   50.388018][    C1] 3 locks held by syz-executor358/3597:
[   50.393555][    C1]  #0: ffff888140c48b70 (&sb->s_type->i_mutex_key#3){+.+.}-{3:3}, at: start_creating.part.0+0xb2/0x280
[   50.404614][    C1]  #1: ffff8880761cf340 (&sb->s_type->i_lock_key#7){+.+.}-{2:2}, at: new_inode+0x48/0x270
[   50.414553][    C1]  #2: ffffc900001e0d70 ((&sq->pending_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x6b0
[   50.424401][    C1] 
[   50.424401][    C1] stack backtrace:
[   50.430280][    C1] CPU: 1 PID: 3597 Comm: syz-executor358 Not tainted 5.19.0-rc4-next-20220628-syzkaller #0
[   50.440250][    C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
[   50.450294][    C1] Call Trace:
[   50.453567][    C1]  <IRQ>
[   50.456407][    C1]  dump_stack_lvl+0xcd/0x134
[   50.461006][    C1]  check_noncircular+0x25f/0x2e0
[   50.465938][    C1]  ? print_circular_bug+0x1e0/0x1e0
[   50.471136][    C1]  ? lock_chain_count+0x20/0x20
[   50.475983][    C1]  ? register_lock_class+0xbe/0x1130
[   50.481276][    C1]  __lock_acquire+0x2abe/0x5660
[   50.486128][    C1]  ? lockdep_hardirqs_on_prepare+0x400/0x400
[   50.492108][    C1]  lock_acquire+0x1ab/0x570
[   50.496612][    C1]  ? throtl_pending_timer_fn+0xf7/0x1690
[   50.502252][    C1]  ? lock_release+0x780/0x780
[   50.506925][    C1]  ? _raw_spin_lock_irq+0x41/0x50
[   50.511954][    C1]  ? throtl_pd_offline+0x1d0/0x1d0
[   50.517068][    C1]  _raw_spin_lock_irq+0x32/0x50
[   50.521923][    C1]  ? throtl_pending_timer_fn+0xf7/0x1690
[   50.527560][    C1]  throtl_pending_timer_fn+0xf7/0x1690
[   50.533030][    C1]  ? throtl_pd_offline+0x1d0/0x1d0
[   50.538158][    C1]  call_timer_fn+0x1a0/0x6b0
[   50.542770][    C1]  ? timer_fixup_activate+0x350/0x350
[   50.548158][    C1]  ? _raw_spin_unlock_irq+0x1f/0x40
[   50.553372][    C1]  ? _raw_spin_unlock_irq+0x1f/0x40
[   50.558576][    C1]  ? throtl_pd_offline+0x1d0/0x1d0
[   50.563705][    C1]  __run_timers.part.0+0x674/0xa80
[   50.568853][    C1]  ? call_timer_fn+0x6b0/0x6b0
[   50.573630][    C1]  ? set_next_task_stop+0x140/0x140
[   50.578832][    C1]  run_timer_softirq+0xb3/0x1d0
[   50.583682][    C1]  __do_softirq+0x29b/0x9c2
[   50.588188][    C1]  __irq_exit_rcu+0x123/0x180
[   50.592863][    C1]  irq_exit_rcu+0x5/0x20
[   50.597105][    C1]  sysvec_apic_timer_interrupt+0x93/0xc0
[   50.602743][    C1]  </IRQ>
[   50.605668][    C1]  <TASK>
[   50.608604][    C1]  asm_sysvec_apic_timer_interrupt+0x1b/0x20
[   50.614582][    C1] RIP: 0010:lock_acquire+0x1ef/0x570
[   50.619862][    C1] Code: e7 a3 7e 83 f8 01 0f 85 e8 02 00 00 9c 58 f6 c4 02 0f 85 fb 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
[   50.639465][    C1] RSP: 0018:ffffc90002fffaa0 EFLAGS: 00000206
[   50.645526][    C1] RAX: dffffc0000000000 RBX: 1ffff920005fff56 RCX: ffffffff815e3c0e
[   50.653490][    C1] RDX: 1ffff11004088899 RSI: 0000000000000001 RDI: 0000000000000000
[   50.661454][    C1] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff906a5967
[   50.669506][    C1] R10: fffffbfff20d4b2c R11: 0000000000000001 R12: 0000000000000000
[   50.677472][    C1] R13: 0000000000000000 R14: ffff8880761cf340 R15: 0000000000000000
[   50.685439][    C1]  ? __lock_acquire+0x163e/0x5660
[   50.690477][    C1]  ? lock_release+0x780/0x780
[   50.695150][    C1]  ? lockdep_init_map_type+0x21a/0x7f0
[   50.700616][    C1]  ? inode_init_always+0x9bf/0xd70
[   50.705729][    C1]  ? inode_init_always+0xb00/0xd70
[   50.710845][    C1]  _raw_spin_lock+0x2a/0x40
[   50.715351][    C1]  ? new_inode+0x48/0x270
[   50.719681][    C1]  new_inode+0x48/0x270
[   50.723837][    C1]  debugfs_get_inode+0x1a/0x130
[   50.728702][    C1]  debugfs_create_dir+0xdc/0x4d0
[   50.733642][    C1]  bdi_register_va.part.0+0x22d/0x800
[   50.739029][    C1]  ? bdi_unregister+0x600/0x600
[   50.743877][    C1]  ? blk_register_queue+0x3d5/0x510
[   50.749077][    C1]  bdi_register+0x12a/0x140
[   50.753581][    C1]  ? bdi_register_va.part.0+0x800/0x800
[   50.759126][    C1]  ? _raw_spin_unlock_irqrestore+0x50/0x70
[   50.764939][    C1]  ? lockdep_hardirqs_on+0x79/0x100
[   50.770140][    C1]  ? _raw_spin_unlock_irqrestore+0x3d/0x70
[   50.775954][    C1]  ? blk_register_queue+0x8a/0x510
[   50.781073][    C1]  device_add_disk+0x83c/0xe20
[   50.785848][    C1]  loop_add+0x884/0xaf0
[   50.790011][    C1]  loop_control_ioctl+0x133/0x540
[   50.795041][    C1]  ? loop_probe+0x80/0x80
[   50.799375][    C1]  ? bpf_lsm_file_ioctl+0x5/0x10
[   50.804322][    C1]  ? loop_probe+0x80/0x80
[   50.808657][    C1]  __x64_sys_ioctl+0x193/0x200
[   50.813430][    C1]  do_syscall_64+0x35/0xb0
[   50.817855][    C1]  entry_SYSCALL_64_after_hwframe+0x46/0xb0
[   50.823753][    C1] RIP: 0033:0x7f92d80b4079
[   50.828172][    C1] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 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 c0 ff ff ff f7 d8 64 89 01 48
[   50.847781][    C1] RSP: 002b:00007ffcc0861258 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
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[   50.856192][    C1] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f92d80b4079
[   50.864161][    C1] RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003
[   50.872130][    C1] RBP: 00007ffcc0861270 R08: 0000000000000002 R09: 0000000000000001
[   50.880098][    C1] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
[   50.888064][    C1] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
[   50.896048][    C1]  </TASK>
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