Warning: Permanently added '10.128.1.33' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 37.358776] netlink: 4 bytes leftover after parsing attributes in process `syz-executor096'. executing program [ 37.424409] netlink: 4 bytes leftover after parsing attributes in process `syz-executor096'. executing program [ 37.473527] netlink: 4 bytes leftover after parsing attributes in process `syz-executor096'. executing program [ 37.514309] netlink: 4 bytes leftover after parsing attributes in process `syz-executor096'. executing program executing program [ 37.573009] netlink: 4 bytes leftover after parsing attributes in process `syz-executor096'. [ 37.613001] netlink: 4 bytes leftover after parsing attributes in process `syz-executor096'. executing program [ 37.663027] netlink: 4 bytes leftover after parsing attributes in process `syz-executor096'. executing program [ 37.703542] netlink: 4 bytes leftover after parsing attributes in process `syz-executor096'. executing program [ 37.753101] netlink: 4 bytes leftover after parsing attributes in process `syz-executor096'. executing program executing program [ 37.802836] netlink: 4 bytes leftover after parsing attributes in process `syz-executor096'. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 40.006719] ------------[ cut here ]------------ [ 40.014481] refcount_t: underflow; use-after-free. [ 40.019813] WARNING: CPU: 1 PID: 8490 at lib/refcount.c:280 refcount_dec_not_one+0x1bc/0x1d0 [ 40.028387] Kernel panic - not syncing: panic_on_warn set ... [ 40.028387] [ 40.035752] CPU: 1 PID: 8490 Comm: systemd-udevd Not tainted 4.19.187-syzkaller #0 [ 40.043438] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.052774] Call Trace: [ 40.055356] dump_stack+0x1fc/0x2ef [ 40.058971] panic+0x26a/0x50e [ 40.062148] ? __warn_printk+0xf3/0xf3 [ 40.066020] ? refcount_dec_not_one+0x1bc/0x1d0 [ 40.070669] ? __probe_kernel_read+0x130/0x1b0 [ 40.075234] ? __warn.cold+0x5/0x5a [ 40.078849] ? __warn+0xe4/0x200 [ 40.082198] ? refcount_dec_not_one+0x1bc/0x1d0 [ 40.086847] __warn.cold+0x20/0x5a [ 40.090723] ? refcount_dec_not_one+0x1bc/0x1d0 [ 40.095372] report_bug+0x262/0x2b0 [ 40.098998] do_error_trap+0x1d7/0x310 [ 40.102880] ? math_error+0x310/0x310 [ 40.107002] ? irq_work_claim+0xa6/0xc0 [ 40.110972] ? irq_work_queue+0x29/0x80 [ 40.114935] ? error_entry+0x72/0xd0 [ 40.118641] ? trace_hardirqs_off_caller+0x6e/0x210 [ 40.123639] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.128561] invalid_op+0x14/0x20 [ 40.131998] RIP: 0010:refcount_dec_not_one+0x1bc/0x1d0 [ 40.137254] Code: 1d 21 e6 98 07 31 ff 89 de e8 b0 93 ec fd 84 db 75 89 e8 77 92 ec fd 48 c7 c7 40 b8 b3 88 c6 05 01 e6 98 07 01 e8 94 8b 7b 04 <0f> 0b 41 bc 01 00 00 00 e9 6a ff ff ff e8 c2 d9 c1 fd 66 90 41 54 [ 40.156150] RSP: 0018:ffff8880ab5ffbd0 EFLAGS: 00010282 [ 40.161585] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 40.168837] RDX: 0000000000000000 RSI: ffffffff814dddb1 RDI: ffffed10156bff6c [ 40.176087] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 40.183340] R10: 0000000000000005 R11: 0000000000000000 R12: 00000000ffffffff [ 40.190591] R13: 1ffff110156bff7b R14: ffff8880ab5ffbf8 R15: ffff8880a338a128 [ 40.197876] ? vprintk_func+0x81/0x180 [ 40.201772] ? __mutex_unlock_slowpath+0x2be/0x610 [ 40.206710] ? refcount_dec_and_test_checked+0x20/0x20 [ 40.211980] ? wait_for_completion_io+0x10/0x10 [ 40.216638] refcount_dec_and_mutex_lock+0x1c/0x80 [ 40.221550] nbd_config_put+0x5bb/0x870 [ 40.225526] nbd_release+0xf4/0x170 [ 40.229143] ? nbd_queue_rq+0xe60/0xe60 [ 40.233131] __blkdev_put+0x636/0x870 [ 40.236924] ? fsync_bdev+0xc0/0xc0 [ 40.240532] ? locks_remove_file+0x2cd/0x450 [ 40.253430] ? blkdev_put+0x85/0x520 [ 40.257127] ? blkdev_put+0x520/0x520 [ 40.260910] blkdev_close+0x86/0xb0 [ 40.264520] __fput+0x2ce/0x890 [ 40.267783] task_work_run+0x148/0x1c0 [ 40.271653] exit_to_usermode_loop+0x251/0x2a0 [ 40.276240] do_syscall_64+0x538/0x620 [ 40.280120] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.285310] RIP: 0033:0x7fcfca695270 [ 40.289004] 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 [ 40.307887] RSP: 002b:00007fff14fdea98 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 40.315577] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fcfca695270 [ 40.322917] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007 [ 40.330257] RBP: 00007fcfcb54f710 R08: 0000000000000045 R09: 0000000000000018 [ 40.337510] R10: 00005640dd86dc48 R11: 0000000000000246 R12: 0000000000000000 [ 40.344767] R13: 00005640dd86dcd0 R14: 0000000000000003 R15: 000000000000000e [ 40.352870] Kernel Offset: disabled [ 40.356531] Rebooting in 86400 seconds..