[ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.235' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 59.458846][ T6819] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 61.204611][ T6844] ------------[ cut here ]------------ [ 61.210575][ T6844] WARNING: CPU: 1 PID: 6844 at kernel/kthread.c:819 kthread_queue_work+0x16d/0x1b0 [ 61.219848][ T6844] Kernel panic - not syncing: panic_on_warn set ... [ 61.226429][ T6844] CPU: 1 PID: 6844 Comm: systemd-udevd Not tainted 5.8.0-rc4-next-20200708-syzkaller #0 [ 61.236127][ T6844] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.246171][ T6844] Call Trace: [ 61.249649][ T6844] dump_stack+0x18f/0x20d [ 61.253970][ T6844] panic+0x2e3/0x75c [ 61.257857][ T6844] ? __warn_printk+0xf3/0xf3 [ 61.262437][ T6844] ? printk+0xba/0xed [ 61.266406][ T6844] ? log_store.cold+0x16/0x16 [ 61.271069][ T6844] ? __warn.cold+0x5/0x45 [ 61.275389][ T6844] ? __warn+0xd6/0x1f2 [ 61.279448][ T6844] ? kthread_queue_work+0x16d/0x1b0 [ 61.284643][ T6844] __warn.cold+0x20/0x45 [ 61.288878][ T6844] ? kthread_queue_work+0x16d/0x1b0 [ 61.294081][ T6844] report_bug+0x1bd/0x210 [ 61.298408][ T6844] handle_bug+0x38/0x90 [ 61.302557][ T6844] exc_invalid_op+0x13/0x40 [ 61.307066][ T6844] asm_exc_invalid_op+0x12/0x20 [ 61.312209][ T6844] RIP: 0010:kthread_queue_work+0x16d/0x1b0 [ 61.318006][ T6844] Code: 0f 85 72 ff ff ff e8 62 49 26 00 48 8d 55 48 4c 89 e6 48 89 ef e8 63 ec ff ff 41 bc 01 00 00 00 e9 56 ff ff ff e8 43 49 26 00 <0f> 0b 45 31 e4 e9 47 ff ff ff 48 c7 c7 f4 61 af 8a e8 dd fd 65 00 [ 61.337929][ T6844] RSP: 0018:ffffc900016e72b8 EFLAGS: 00010093 [ 61.344153][ T6844] RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff814db478 [ 61.352111][ T6844] RDX: ffff888095b08440 RSI: ffffffff814db4ed RDI: ffff8880a1d731c0 [ 61.360227][ T6844] RBP: ffff8880a1d73158 R08: 0000000000000001 R09: 0000000000000003 [ 61.368186][ T6844] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a14d6328 [ 61.376145][ T6844] R13: 0000000000000286 R14: ffff8880a1d73160 R15: dffffc0000000000 [ 61.384121][ T6844] ? kthread_queue_work+0xf8/0x1b0 [ 61.389329][ T6844] ? kthread_queue_work+0x16d/0x1b0 [ 61.394659][ T6844] ? kthread_queue_work+0x16d/0x1b0 [ 61.399978][ T6844] loop_queue_rq+0x428/0x590 [ 61.404567][ T6844] blk_mq_dispatch_rq_list+0x2e0/0x1e40 [ 61.410116][ T6844] ? elv_rb_del+0x50/0x90 [ 61.414438][ T6844] ? blk_mq_dequeue_from_ctx+0x810/0x810 [ 61.420182][ T6844] ? do_raw_spin_unlock+0x171/0x230 [ 61.425368][ T6844] ? _raw_spin_unlock+0x24/0x40 [ 61.430290][ T6844] ? dd_dispatch_request+0x225/0x880 [ 61.435733][ T6844] __blk_mq_do_dispatch_sched+0x3bc/0x870 [ 61.441445][ T6844] ? blk_mq_sched_free_hctx_data+0x1e0/0x1e0 [ 61.447413][ T6844] ? lock_acquire+0x1f1/0xad0 [ 61.452071][ T6844] ? hctx_lock+0x7f/0x1d0 [ 61.456396][ T6844] __blk_mq_sched_dispatch_requests+0x394/0x490 [ 61.462624][ T6844] ? blk_mq_do_dispatch_ctx+0x610/0x610 [ 61.468415][ T6844] ? lock_acquire+0x1f1/0xad0 [ 61.473122][ T6844] blk_mq_sched_dispatch_requests+0xfb/0x180 [ 61.479124][ T6844] __blk_mq_run_hw_queue+0x13a/0x2d0 [ 61.484394][ T6844] ? trace_block_unplug+0x300/0x300 [ 61.489583][ T6844] ? do_raw_spin_lock+0x120/0x2b0 [ 61.494693][ T6844] ? find_held_lock+0x2d/0x110 [ 61.499447][ T6844] __blk_mq_delay_run_hw_queue+0x522/0x5f0 [ 61.505238][ T6844] blk_mq_run_hw_queue+0x16c/0x2f0 [ 61.510335][ T6844] ? blk_mq_delay_run_hw_queues+0x1a0/0x1a0 [ 61.516220][ T6844] ? dd_merged_requests+0x3d0/0x3d0 [ 61.521405][ T6844] blk_mq_sched_insert_requests+0x286/0x620 [ 61.527285][ T6844] blk_mq_flush_plug_list+0x3d8/0x560 [ 61.532646][ T6844] ? blk_mq_insert_requests+0x600/0x600 [ 61.538180][ T6844] ? kblockd_mod_delayed_work_on+0x30/0x30 [ 61.543988][ T6844] blk_finish_plug+0x83/0xe0 [ 61.548575][ T6844] read_pages+0x4a5/0x8d0 [ 61.552893][ T6844] ? read_cache_pages+0x750/0x750 [ 61.557990][ T6844] ? add_to_page_cache_lru+0x2ab/0x5b0 [ 61.563435][ T6844] ? alloc_pages_current+0x18f/0x280 [ 61.568708][ T6844] ? __page_cache_alloc+0x10b/0x450 [ 61.573894][ T6844] page_cache_readahead_unbounded+0x572/0x850 [ 61.579950][ T6844] ? lock_acquire+0x1f1/0xad0 [ 61.584619][ T6844] ? read_pages+0x8d0/0x8d0 [ 61.589110][ T6844] ? blk_cgroup_congested+0x1f9/0x3e0 [ 61.594476][ T6844] force_page_cache_readahead+0x2e9/0x460 [ 61.600195][ T6844] page_cache_sync_readahead+0x113/0x130 [ 61.605814][ T6844] generic_file_buffered_read+0x159d/0x3150 [ 61.611809][ T6844] generic_file_read_iter+0x396/0x4e0 [ 61.617255][ T6844] ? aa_path_link+0x2f0/0x2f0 [ 61.621929][ T6844] blkdev_read_iter+0x11b/0x180 [ 61.626768][ T6844] new_sync_read+0x41a/0x6e0 [ 61.631345][ T6844] ? vfs_dedupe_file_range+0x780/0x780 [ 61.636801][ T6844] vfs_read+0x45c/0x520 [ 61.640943][ T6844] ksys_read+0x12d/0x250 [ 61.645169][ T6844] ? vfs_write+0x6b0/0x6b0 [ 61.649576][ T6844] do_syscall_64+0x60/0xe0 [ 61.653980][ T6844] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 61.659862][ T6844] RIP: 0033:0x7ff65bf6a210 [ 61.664263][ T6844] Code: Bad RIP value. [ 61.668404][ T6844] RSP: 002b:00007ffde963e968 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 61.676821][ T6844] RAX: ffffffffffffffda RBX: 0000557d6f90c200 RCX: 00007ff65bf6a210 [ 61.684831][ T6844] RDX: 0000000000000400 RSI: 0000557d6f90c228 RDI: 000000000000000f [ 61.692785][ T6844] RBP: 0000557d6f90ed90 R08: 00007ff65bf54fe8 R09: 0000000000000430 [ 61.700857][ T6844] R10: 0000557d6f90c218 R11: 0000000000000246 R12: 0000000000000000 [ 61.708812][ T6844] R13: 0000000000000400 R14: 0000557d6f90ede0 R15: 0000000000000400 [ 62.806498][ T6844] Shutting down cpus with NMI [ 62.812594][ T6844] Kernel Offset: disabled [ 62.816968][ T6844] Rebooting in 86400 seconds..