Warning: Permanently added '10.128.1.6' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 33.556850] ------------[ cut here ]------------ [ 33.562340] refcount_t: underflow; use-after-free. [ 33.569730] WARNING: CPU: 0 PID: 8269 at lib/refcount.c:280 refcount_dec_not_one+0x1bc/0x1d0 [ 33.578297] Kernel panic - not syncing: panic_on_warn set ... [ 33.578297] [ 33.585641] CPU: 0 PID: 8269 Comm: systemd-udevd Not tainted 4.19.211-syzkaller #0 [ 33.593330] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.602659] Call Trace: [ 33.605229] dump_stack+0x1fc/0x2ef [ 33.608838] panic+0x26a/0x50e [ 33.612010] ? __warn_printk+0xf3/0xf3 [ 33.615882] ? refcount_dec_not_one+0x1bc/0x1d0 [ 33.620535] ? __probe_kernel_read+0x130/0x1b0 [ 33.625097] ? __warn.cold+0x5/0x5a [ 33.628704] ? __warn+0xe4/0x200 [ 33.632053] ? refcount_dec_not_one+0x1bc/0x1d0 [ 33.636700] __warn.cold+0x20/0x5a [ 33.640231] ? refcount_dec_not_one+0x1bc/0x1d0 [ 33.644890] report_bug+0x262/0x2b0 [ 33.648499] do_error_trap+0x1d7/0x310 [ 33.652380] ? math_error+0x310/0x310 [ 33.656172] ? __irq_work_queue_local+0x101/0x160 [ 33.660997] ? irq_work_queue+0x29/0x80 [ 33.664952] ? error_entry+0x72/0xd0 [ 33.668649] ? trace_hardirqs_off_caller+0x6e/0x210 [ 33.673647] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.678477] invalid_op+0x14/0x20 [ 33.681916] RIP: 0010:refcount_dec_not_one+0x1bc/0x1d0 [ 33.687172] Code: 1d d5 96 98 07 31 ff 89 de e8 f0 71 ec fd 84 db 75 89 e8 b7 70 ec fd 48 c7 c7 e0 c0 b3 88 c6 05 b5 96 98 07 01 e8 89 a8 7c 04 <0f> 0b 41 bc 01 00 00 00 e9 6a ff ff ff e8 22 91 c1 fd 66 90 41 54 [ 33.706055] RSP: 0018:ffff8880978cfbd0 EFLAGS: 00010282 [ 33.711398] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 33.718648] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1012f19f6c [ 33.725904] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 33.733153] R10: 0000000000000005 R11: 0000000000000000 R12: 00000000ffffffff [ 33.740401] R13: 1ffff11012f19f7b R14: ffff8880978cfbf8 R15: ffff88809bc80168 [ 33.747659] ? vprintk_func+0x81/0x180 [ 33.751532] ? __mutex_unlock_slowpath+0x2be/0x610 [ 33.756441] ? refcount_dec_and_test_checked+0x20/0x20 [ 33.761702] ? wait_for_completion_io+0x10/0x10 [ 33.766357] refcount_dec_and_mutex_lock+0x1c/0x80 [ 33.771272] nbd_config_put+0x5bb/0x870 [ 33.775234] nbd_release+0xf4/0x170 [ 33.778852] ? nbd_queue_rq+0xe60/0xe60 [ 33.782817] __blkdev_put+0x636/0x870 [ 33.786605] ? fsync_bdev+0xc0/0xc0 [ 33.790211] ? locks_remove_file+0x2cd/0x450 [ 33.794602] ? blkdev_put+0x85/0x520 [ 33.798305] ? blkdev_put+0x520/0x520 [ 33.802095] blkdev_close+0x86/0xb0 [ 33.805711] __fput+0x2ce/0x890 [ 33.808977] task_work_run+0x148/0x1c0 [ 33.812848] exit_to_usermode_loop+0x251/0x2a0 [ 33.817410] do_syscall_64+0x538/0x620 [ 33.821283] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.826457] RIP: 0033:0x7fbeb4d9b270 [ 33.830154] Code: 73 01 c3 48 8b 0d 38 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 59 c1 20 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ee fb ff ff 48 89 04 24 [ 33.849036] RSP: 002b:00007ffff29d0928 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 33.856724] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fbeb4d9b270 [ 33.863973] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007 [ 33.871224] RBP: 00007fbeb5c55710 R08: 00005555d4300ef0 R09: 0000000000000018 [ 33.878474] R10: 00005555d42fa758 R11: 0000000000000246 R12: 0000000000000000 [ 33.885730] R13: 00005555d42fa860 R14: 0000000000000003 R15: 000000000000000e [ 33.893354] Kernel Offset: disabled [ 33.897013] Rebooting in 86400 seconds..