Warning: Permanently added '10.128.0.213' (ECDSA) to the list of known hosts. executing program executing program executing program executing program syzkaller login: [ 53.041738][ T3610] [ 53.044086][ T3610] ====================================================== [ 53.051106][ T3610] WARNING: possible circular locking dependency detected [ 53.058105][ T3610] 5.19.0-rc4-syzkaller #0 Not tainted [ 53.063481][ T3610] ------------------------------------------------------ [ 53.070489][ T3610] syz-executor831/3610 is trying to acquire lock: [ 53.076885][ T3610] ffff88807856d0a8 ((&sq->pending_timer)){+.-.}-{0:0}, at: del_timer_sync+0x33/0x1b0 [ 53.086355][ T3610] [ 53.086355][ T3610] but task is already holding lock: [ 53.093715][ T3610] ffffffff910dbf30 (&blkcg->lock){....}-{2:2}, at: blkcg_deactivate_policy+0x1e7/0x4e0 [ 53.103372][ T3610] [ 53.103372][ T3610] which lock already depends on the new lock. [ 53.103372][ T3610] [ 53.113766][ T3610] [ 53.113766][ T3610] the existing dependency chain (in reverse order) is: [ 53.122782][ T3610] [ 53.122782][ T3610] -> #2 (&blkcg->lock){....}-{2:2}: [ 53.130170][ T3610] _raw_spin_lock+0x2a/0x40 [ 53.135200][ T3610] blkg_create+0x45e/0x1000 [ 53.140225][ T3610] blkcg_init_queue+0xb2/0x610 [ 53.145514][ T3610] __alloc_disk_node+0x260/0x610 [ 53.150978][ T3610] __blk_alloc_disk+0x35/0x70 [ 53.156180][ T3610] brd_alloc.part.0+0x27f/0x7a0 [ 53.161558][ T3610] brd_init+0x1b8/0x24b [ 53.166237][ T3610] do_one_initcall+0x103/0x650 [ 53.171528][ T3610] kernel_init_freeable+0x6b1/0x73a [ 53.177251][ T3610] kernel_init+0x1a/0x1d0 [ 53.182106][ T3610] ret_from_fork+0x1f/0x30 [ 53.187048][ T3610] [ 53.187048][ T3610] -> #1 (&q->queue_lock){..-.}-{2:2}: [ 53.194608][ T3610] _raw_spin_lock_irq+0x32/0x50 [ 53.199989][ T3610] throtl_pending_timer_fn+0xf7/0x1690 [ 53.205975][ T3610] call_timer_fn+0x1a5/0x6b0 [ 53.211178][ T3610] __run_timers.part.0+0x679/0xa80 [ 53.216820][ T3610] run_timer_softirq+0xb3/0x1d0 [ 53.222194][ T3610] __do_softirq+0x29b/0x9c2 [ 53.227223][ T3610] __irq_exit_rcu+0x123/0x180 [ 53.232423][ T3610] irq_exit_rcu+0x5/0x20 [ 53.237187][ T3610] sysvec_apic_timer_interrupt+0x93/0xc0 [ 53.243347][ T3610] asm_sysvec_apic_timer_interrupt+0x1b/0x20 [ 53.249855][ T3610] acpi_idle_do_entry+0x1c9/0x240 [ 53.255408][ T3610] acpi_idle_enter+0x369/0x510 [ 53.260699][ T3610] cpuidle_enter_state+0x1b1/0xc80 [ 53.266335][ T3610] cpuidle_enter+0x4a/0xa0 [ 53.271274][ T3610] do_idle+0x3e8/0x590 [ 53.275874][ T3610] cpu_startup_entry+0x14/0x20 [ 53.281162][ T3610] start_secondary+0x21d/0x2b0 [ 53.286453][ T3610] secondary_startup_64_no_verify+0xce/0xdb [ 53.292892][ T3610] [ 53.292892][ T3610] -> #0 ((&sq->pending_timer)){+.-.}-{0:0}: [ 53.300977][ T3610] __lock_acquire+0x2abe/0x5660 [ 53.306356][ T3610] lock_acquire+0x1ab/0x570 [ 53.311385][ T3610] del_timer_sync+0x5b/0x1b0 [ 53.316499][ T3610] throtl_pd_free+0x15/0x40 [ 53.321537][ T3610] blkcg_deactivate_policy+0x2d2/0x4e0 [ 53.327517][ T3610] blk_throtl_exit+0x8a/0x1a0 [ 53.332723][ T3610] blkcg_init_queue+0x19b/0x610 [ 53.338097][ T3610] __alloc_disk_node+0x260/0x610 [ 53.343568][ T3610] __blk_mq_alloc_disk+0x133/0x1c0 [ 53.349208][ T3610] loop_add+0x3e2/0xaf0 [ 53.353887][ T3610] loop_control_ioctl+0x133/0x540 [ 53.359435][ T3610] __do_compat_sys_ioctl+0x1c7/0x290 [ 53.365251][ T3610] __do_fast_syscall_32+0x65/0xf0 [ 53.370807][ T3610] do_fast_syscall_32+0x2f/0x70 [ 53.376185][ T3610] entry_SYSENTER_compat_after_hwframe+0x53/0x62 [ 53.383044][ T3610] [ 53.383044][ T3610] other info that might help us debug this: [ 53.383044][ T3610] [ 53.393263][ T3610] Chain exists of: [ 53.393263][ T3610] (&sq->pending_timer) --> &q->queue_lock --> &blkcg->lock [ 53.393263][ T3610] [ 53.406396][ T3610] Possible unsafe locking scenario: [ 53.406396][ T3610] [ 53.413836][ T3610] CPU0 CPU1 [ 53.419194][ T3610] ---- ---- [ 53.424552][ T3610] lock(&blkcg->lock); [ 53.428711][ T3610] lock(&q->queue_lock); [ 53.435569][ T3610] lock(&blkcg->lock); [ 53.442246][ T3610] lock((&sq->pending_timer)); [ 53.447096][ T3610] [ 53.447096][ T3610] *** DEADLOCK *** [ 53.447096][ T3610] [ 53.455234][ T3610] 2 locks held by syz-executor831/3610: [ 53.460777][ T3610] #0: ffff88802029a380 (&q->queue_lock){..-.}-{2:2}, at: blkcg_deactivate_policy+0xfe/0x4e0 [ 53.470972][ T3610] #1: ffffffff910dbf30 (&blkcg->lock){....}-{2:2}, at: blkcg_deactivate_policy+0x1e7/0x4e0 [ 53.481092][ T3610] [ 53.481092][ T3610] stack backtrace: [ 53.486970][ T3610] CPU: 1 PID: 3610 Comm: syz-executor831 Not tainted 5.19.0-rc4-syzkaller #0 [ 53.495731][ T3610] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.505784][ T3610] Call Trace: [ 53.509061][ T3610] [ 53.511989][ T3610] dump_stack_lvl+0xcd/0x134 [ 53.516587][ T3610] check_noncircular+0x25f/0x2e0 [ 53.521539][ T3610] ? register_lock_class+0xbe/0x1130 [ 53.526834][ T3610] ? print_circular_bug+0x1e0/0x1e0 [ 53.532039][ T3610] ? __lock_acquire+0x163e/0x5660 [ 53.537076][ T3610] ? find_held_lock+0x2d/0x110 [ 53.541854][ T3610] __lock_acquire+0x2abe/0x5660 [ 53.546722][ T3610] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 53.552716][ T3610] lock_acquire+0x1ab/0x570 [ 53.557227][ T3610] ? del_timer_sync+0x33/0x1b0 [ 53.562003][ T3610] ? lock_release+0x780/0x780 [ 53.566690][ T3610] ? lock_release+0x780/0x780 [ 53.571374][ T3610] ? blk_mq_freeze_queue_wait+0xab/0x160 [ 53.577017][ T3610] ? blk_mq_queue_inflight+0xa0/0xa0 [ 53.582311][ T3610] ? do_raw_spin_lock+0x120/0x2a0 [ 53.587342][ T3610] del_timer_sync+0x5b/0x1b0 [ 53.591938][ T3610] ? del_timer_sync+0x33/0x1b0 [ 53.596715][ T3610] throtl_pd_free+0x15/0x40 [ 53.601222][ T3610] blkcg_deactivate_policy+0x2d2/0x4e0 [ 53.606688][ T3610] ? throtl_upgrade_state+0xee0/0xee0 [ 53.612069][ T3610] blk_throtl_exit+0x8a/0x1a0 [ 53.616753][ T3610] blkcg_init_queue+0x19b/0x610 [ 53.621616][ T3610] __alloc_disk_node+0x260/0x610 [ 53.626564][ T3610] __blk_mq_alloc_disk+0x133/0x1c0 [ 53.631692][ T3610] loop_add+0x3e2/0xaf0 [ 53.635857][ T3610] loop_control_ioctl+0x133/0x540 [ 53.640885][ T3610] ? loop_probe+0x80/0x80 [ 53.645220][ T3610] ? bpf_lsm_file_ioctl+0x5/0x10 [ 53.650166][ T3610] ? loop_probe+0x80/0x80 [ 53.654499][ T3610] __do_compat_sys_ioctl+0x1c7/0x290 [ 53.659797][ T3610] __do_fast_syscall_32+0x65/0xf0 [ 53.664833][ T3610] do_fast_syscall_32+0x2f/0x70 [ 53.669693][ T3610] entry_SYSENTER_compat_after_hwframe+0x53/0x62 [ 53.676030][ T3610] RIP: 0023:0xf7f02549 [ 53.680099][ T3610] Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 [ 53.699708][ T3610] RSP: 002b:00000000f7efd6ec EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 53.708126][ T3610] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004c80 [ 53.716098][ T3610] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002 [ 53.724069][ T3610] RBP: 00000000f7f86021 R08: 0000000000000000 R09: 0000000000000000 [ 53.732051][ T3610] R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000000 executing program executing program executing program executing program executing program executing program [ 53.740023][ T3610] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 53.747998][ T3610] executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program