[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.43' (ECDSA) to the list of known hosts. syzkaller login: [ 33.334196] IPVS: ftp: loaded support on port[0] = 21 executing program [ 33.419874] UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/09/12 12:00 (1000) [ 33.452990] VFS: brelse: Trying to free free buffer [ 33.458092] ------------[ cut here ]------------ [ 33.462841] WARNING: CPU: 1 PID: 2819 at fs/buffer.c:1206 __brelse.part.0+0x11/0x14 [ 33.470611] Kernel panic - not syncing: panic_on_warn set ... [ 33.470611] [ 33.477958] CPU: 1 PID: 2819 Comm: kworker/u4:3 Not tainted 4.14.296-syzkaller #0 [ 33.485554] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 [ 33.494890] Workqueue: netns cleanup_net [ 33.498938] Call Trace: [ 33.501499] [ 33.503630] dump_stack+0x1b2/0x281 [ 33.507236] panic+0x1f9/0x42d [ 33.510406] ? add_taint.cold+0x16/0x16 [ 33.514448] ? __brelse.part.0+0x11/0x14 [ 33.518488] ? __brelse.part.0+0x11/0x14 [ 33.522526] __warn.cold+0x20/0x44 [ 33.526068] ? ist_end_non_atomic+0x10/0x10 [ 33.530386] ? __brelse.part.0+0x11/0x14 [ 33.534442] report_bug+0x208/0x250 [ 33.538068] do_error_trap+0x195/0x2d0 [ 33.541937] ? math_error+0x2d0/0x2d0 [ 33.545721] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.550547] invalid_op+0x1b/0x40 [ 33.553979] RIP: 0010:__brelse.part.0+0x11/0x14 [ 33.558622] RSP: 0018:ffff8880ba507f68 EFLAGS: 00010086 [ 33.563962] RAX: 0000000000000027 RBX: ffff8880ba531cb0 RCX: 0000000000000000 [ 33.571215] RDX: 0000000000010000 RSI: ffffffff878bc9e0 RDI: ffffed10174a0fe3 [ 33.578637] RBP: ffff88808e43fb28 R08: 0000000000000027 R09: 0000000000000006 [ 33.585973] R10: 0000000000000000 R11: ffff8880ae76a500 R12: dffffc0000000000 [ 33.593232] R13: ffff8880ba531d20 R14: ffffffff8192f760 R15: 0000000000000000 [ 33.600500] ? buffer_exit_cpu_dead+0x1e0/0x1e0 [ 33.605163] ? __brelse.part.0+0x11/0x14 [ 33.609208] invalidate_bh_lru.cold+0xa/0xf [ 33.613514] flush_smp_call_function_queue+0xd1/0x2f0 [ 33.618689] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 33.624144] smp_call_function_single_interrupt+0xa3/0x4e0 [ 33.629748] call_function_single_interrupt+0x93/0xa0 [ 33.634916] [ 33.637136] RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 [ 33.642827] RSP: 0018:ffff8880ae777b58 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff04 [ 33.650517] RAX: 1ffffffff11e1359 RBX: 0000000000000282 RCX: 1ffff11015ced5ce [ 33.657769] RDX: dffffc0000000000 RSI: ffff8880ae76ae50 RDI: 0000000000000282 [ 33.665018] RBP: ffffffff89007ac0 R08: ffffffff8b9ba2b0 R09: 0000000000000000 [ 33.672312] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880aad23e00 [ 33.679561] R13: ffff8880ae777bd8 R14: 0000000000000000 R15: ffff8880a186b250 [ 33.686827] quarantine_remove_cache+0x72/0xd0 [ 33.691409] shutdown_cache+0xe/0x1e0 [ 33.695192] kmem_cache_destroy+0x1d2/0x240 [ 33.699495] ? destroy_workqueue+0x5f2/0x710 [ 33.703885] tipc_server_stop+0x13a/0x180 [ 33.708194] tipc_topsrv_exit_net+0x168/0x290 [ 33.712671] ? tipc_topsrv_init_net+0x730/0x730 [ 33.717323] ops_exit_list+0xad/0x160 [ 33.721103] cleanup_net+0x3b3/0x840 [ 33.724803] ? net_drop_ns+0x70/0x70 [ 33.728495] ? lock_acquire+0x170/0x3f0 [ 33.732454] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 33.737884] process_one_work+0x793/0x14a0 [ 33.742103] ? work_busy+0x320/0x320 [ 33.745797] ? worker_thread+0x158/0xff0 [ 33.749868] ? _raw_spin_unlock_irq+0x24/0x80 [ 33.754346] worker_thread+0x5cc/0xff0 [ 33.758219] ? rescuer_thread+0xc80/0xc80 [ 33.762347] kthread+0x30d/0x420 [ 33.765693] ? kthread_create_on_node+0xd0/0xd0 [ 33.770342] ret_from_fork+0x24/0x30 [ 33.774332] Kernel Offset: disabled [ 33.777988] Rebooting in 86400 seconds..