forked to background, child pid 3186 no interfaces have a carrier [ 26.854717][ T3187] 8021q: adding VLAN 0 to HW filter on device bond0 [ 26.868166][ T3187] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.1.28' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 62.213022][ T3617] [ 62.215726][ T3617] ====================================================== [ 62.223292][ T3617] WARNING: possible circular locking dependency detected [ 62.230303][ T3617] 5.19.0-rc4-syzkaller-00044-g1a0e93df1e10 #0 Not tainted [ 62.237402][ T3617] ------------------------------------------------------ [ 62.244418][ T3617] syz-executor209/3617 is trying to acquire lock: [ 62.250874][ T3617] ffff8880173e60a8 ((&sq->pending_timer)){+.-.}-{0:0}, at: del_timer_sync+0x33/0x1b0 [ 62.260351][ T3617] [ 62.260351][ T3617] but task is already holding lock: [ 62.267720][ T3617] ffffffff910dbf30 (&blkcg->lock){....}-{2:2}, at: blkcg_deactivate_policy+0x1e7/0x4e0 [ 62.277435][ T3617] [ 62.277435][ T3617] which lock already depends on the new lock. [ 62.277435][ T3617] [ 62.287838][ T3617] [ 62.287838][ T3617] the existing dependency chain (in reverse order) is: [ 62.296879][ T3617] [ 62.296879][ T3617] -> #2 (&blkcg->lock){....}-{2:2}: [ 62.304256][ T3617] _raw_spin_lock+0x2a/0x40 [ 62.309304][ T3617] blkg_create+0x45e/0x1000 [ 62.314322][ T3617] blkcg_init_queue+0xb2/0x610 [ 62.319601][ T3617] __alloc_disk_node+0x260/0x610 [ 62.325077][ T3617] __blk_alloc_disk+0x35/0x70 [ 62.330457][ T3617] brd_alloc.part.0+0x27f/0x7a0 [ 62.335820][ T3617] brd_init+0x1b8/0x24b [ 62.340486][ T3617] do_one_initcall+0x103/0x650 [ 62.345790][ T3617] kernel_init_freeable+0x6b1/0x73a [ 62.351522][ T3617] kernel_init+0x1a/0x1d0 [ 62.356361][ T3617] ret_from_fork+0x1f/0x30 [ 62.361287][ T3617] [ 62.361287][ T3617] -> #1 (&q->queue_lock){..-.}-{2:2}: [ 62.368840][ T3617] _raw_spin_lock_irq+0x32/0x50 [ 62.374204][ T3617] throtl_pending_timer_fn+0xf7/0x1690 [ 62.380281][ T3617] call_timer_fn+0x1a5/0x6b0 [ 62.385413][ T3617] __run_timers.part.0+0x679/0xa80 [ 62.391038][ T3617] run_timer_softirq+0xb3/0x1d0 [ 62.396401][ T3617] __do_softirq+0x29b/0x9c2 [ 62.401416][ T3617] __irq_exit_rcu+0x123/0x180 [ 62.406604][ T3617] irq_exit_rcu+0x5/0x20 [ 62.411365][ T3617] sysvec_apic_timer_interrupt+0x93/0xc0 [ 62.417510][ T3617] asm_sysvec_apic_timer_interrupt+0x1b/0x20 [ 62.424118][ T3617] ___slab_alloc+0x7a1/0xe20 [ 62.429236][ T3617] __slab_alloc.constprop.0+0x4d/0xa0 [ 62.435137][ T3617] kmem_cache_alloc_lru+0x504/0x720 [ 62.440986][ T3617] alloc_inode+0x168/0x230 [ 62.445934][ T3617] iget_locked+0x1cc/0x740 [ 62.450892][ T3617] kernfs_get_inode+0x47/0x520 [ 62.456169][ T3617] kernfs_iop_lookup+0x1e5/0x320 [ 62.461664][ T3617] __lookup_slow+0x24c/0x480 [ 62.466774][ T3617] walk_component+0x40f/0x6a0 [ 62.472152][ T3617] link_path_walk.part.0+0x7ef/0xf70 [ 62.477950][ T3617] path_openat+0x260/0x2910 [ 62.482971][ T3617] do_filp_open+0x1aa/0x400 [ 62.488004][ T3617] do_sys_openat2+0x16d/0x4c0 [ 62.493197][ T3617] __x64_sys_openat+0x13f/0x1f0 [ 62.498593][ T3617] do_syscall_64+0x35/0xb0 [ 62.503538][ T3617] entry_SYSCALL_64_after_hwframe+0x46/0xb0 [ 62.509964][ T3617] [ 62.509964][ T3617] -> #0 ((&sq->pending_timer)){+.-.}-{0:0}: [ 62.518037][ T3617] __lock_acquire+0x2abe/0x5660 [ 62.523411][ T3617] lock_acquire+0x1ab/0x570 [ 62.528430][ T3617] del_timer_sync+0x5b/0x1b0 [ 62.533658][ T3617] throtl_pd_free+0x15/0x40 [ 62.538676][ T3617] blkcg_deactivate_policy+0x2d2/0x4e0 [ 62.544684][ T3617] blk_throtl_exit+0x8a/0x1a0 [ 62.549875][ T3617] blkcg_init_queue+0x19b/0x610 [ 62.555262][ T3617] __alloc_disk_node+0x260/0x610 [ 62.560714][ T3617] __blk_mq_alloc_disk+0x133/0x1c0 [ 62.566348][ T3617] loop_add+0x3e2/0xaf0 [ 62.571016][ T3617] loop_control_ioctl+0x133/0x540 [ 62.576551][ T3617] __do_compat_sys_ioctl+0x1c7/0x290 [ 62.582346][ T3617] __do_fast_syscall_32+0x65/0xf0 [ 62.587886][ T3617] do_fast_syscall_32+0x2f/0x70 [ 62.593248][ T3617] entry_SYSENTER_compat_after_hwframe+0x53/0x62 [ 62.600099][ T3617] [ 62.600099][ T3617] other info that might help us debug this: [ 62.600099][ T3617] [ 62.610318][ T3617] Chain exists of: [ 62.610318][ T3617] (&sq->pending_timer) --> &q->queue_lock --> &blkcg->lock [ 62.610318][ T3617] [ 62.623526][ T3617] Possible unsafe locking scenario: [ 62.623526][ T3617] [ 62.630962][ T3617] CPU0 CPU1 [ 62.636331][ T3617] ---- ---- [ 62.641681][ T3617] lock(&blkcg->lock); [ 62.645824][ T3617] lock(&q->queue_lock); [ 62.652678][ T3617] lock(&blkcg->lock); [ 62.659337][ T3617] lock((&sq->pending_timer)); [ 62.664173][ T3617] [ 62.664173][ T3617] *** DEADLOCK *** [ 62.664173][ T3617] [ 62.672300][ T3617] 2 locks held by syz-executor209/3617: [ 62.677828][ T3617] #0: ffff88801fd080d0 (&q->queue_lock){..-.}-{2:2}, at: blkcg_deactivate_policy+0xfe/0x4e0 [ 62.688094][ T3617] #1: ffffffff910dbf30 (&blkcg->lock){....}-{2:2}, at: blkcg_deactivate_policy+0x1e7/0x4e0 [ 62.698275][ T3617] [ 62.698275][ T3617] stack backtrace: [ 62.704148][ T3617] CPU: 0 PID: 3617 Comm: syz-executor209 Not tainted 5.19.0-rc4-syzkaller-00044-g1a0e93df1e10 #0 [ 62.715089][ T3617] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2022 [ 62.725136][ T3617] Call Trace: [ 62.728417][ T3617] [ 62.731356][ T3617] dump_stack_lvl+0xcd/0x134 [ 62.735977][ T3617] check_noncircular+0x25f/0x2e0 [ 62.740920][ T3617] ? register_lock_class+0xbe/0x1130 [ 62.746217][ T3617] ? print_circular_bug+0x1e0/0x1e0 [ 62.751468][ T3617] ? __lock_acquire+0x163e/0x5660 [ 62.756498][ T3617] ? find_held_lock+0x2d/0x110 [ 62.761342][ T3617] __lock_acquire+0x2abe/0x5660 [ 62.766214][ T3617] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 62.772212][ T3617] lock_acquire+0x1ab/0x570 [ 62.776713][ T3617] ? del_timer_sync+0x33/0x1b0 [ 62.781468][ T3617] ? lock_release+0x780/0x780 [ 62.786152][ T3617] ? lock_release+0x780/0x780 [ 62.790830][ T3617] ? blk_mq_freeze_queue_wait+0xab/0x160 [ 62.796472][ T3617] ? blk_mq_queue_inflight+0xa0/0xa0 [ 62.801760][ T3617] ? do_raw_spin_lock+0x120/0x2a0 [ 62.806772][ T3617] del_timer_sync+0x5b/0x1b0 [ 62.811350][ T3617] ? del_timer_sync+0x33/0x1b0 [ 62.816113][ T3617] throtl_pd_free+0x15/0x40 [ 62.820622][ T3617] blkcg_deactivate_policy+0x2d2/0x4e0 [ 62.826164][ T3617] ? throtl_upgrade_state+0xee0/0xee0 [ 62.831542][ T3617] blk_throtl_exit+0x8a/0x1a0 [ 62.836279][ T3617] blkcg_init_queue+0x19b/0x610 [ 62.841141][ T3617] __alloc_disk_node+0x260/0x610 [ 62.846078][ T3617] __blk_mq_alloc_disk+0x133/0x1c0 [ 62.851189][ T3617] loop_add+0x3e2/0xaf0 [ 62.855350][ T3617] ? lock_downgrade+0x6e0/0x6e0 [ 62.860204][ T3617] loop_control_ioctl+0x133/0x540 [ 62.865227][ T3617] ? loop_probe+0x80/0x80 [ 62.869580][ T3617] ? bpf_lsm_file_ioctl+0x5/0x10 [ 62.874542][ T3617] ? loop_probe+0x80/0x80 [ 62.878958][ T3617] __do_compat_sys_ioctl+0x1c7/0x290 [ 62.884273][ T3617] __do_fast_syscall_32+0x65/0xf0 [ 62.889306][ T3617] do_fast_syscall_32+0x2f/0x70 [ 62.894161][ T3617] entry_SYSENTER_compat_after_hwframe+0x53/0x62 [ 62.900497][ T3617] RIP: 0023:0xf7ec3549 [ 62.904734][ T3617] 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 [ 62.924351][ T3617] RSP: 002b:00000000ffc8bd1c EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 62.932791][ T3617] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004c80 [ 62.940756][ T3617] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000040000 [ 62.948732][ T3617] RBP: 000000000000f2dd R08: 0000000000000000 R09: 0000000000000000 [ 62.956697][ T3617] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 executing program executing program executing program executing program executing program executing program executing program [ 62.964659][ T3617] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 62.972936][ T3617] executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program