[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.16' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 33.979048] ------------[ cut here ]------------ [ 33.983992] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 33.993844] WARNING: CPU: 0 PID: 8107 at block/blk-core.c:2182 generic_make_request_checks+0x17d9/0x22e0 [ 34.003483] Kernel panic - not syncing: panic_on_warn set ... [ 34.003483] [ 34.010829] CPU: 0 PID: 8107 Comm: syz-executor294 Not tainted 4.19.165-syzkaller #0 [ 34.018685] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.028017] Call Trace: [ 34.030592] dump_stack+0x1fc/0x2fe [ 34.034201] panic+0x26a/0x50e [ 34.037372] ? __warn_printk+0xf3/0xf3 [ 34.041244] ? generic_make_request_checks+0x17d9/0x22e0 [ 34.046675] ? __probe_kernel_read+0x130/0x1b0 [ 34.051241] ? __warn.cold+0x5/0x61 [ 34.054849] ? __warn+0xe4/0x200 [ 34.058197] ? generic_make_request_checks+0x17d9/0x22e0 [ 34.063627] __warn.cold+0x20/0x61 [ 34.067165] ? generic_make_request_checks+0x17d9/0x22e0 [ 34.072596] report_bug+0x262/0x2b0 [ 34.076235] do_error_trap+0x1d7/0x310 [ 34.080102] ? math_error+0x310/0x310 [ 34.083885] ? __irq_work_queue_local+0x101/0x160 [ 34.088712] ? irq_work_queue+0x29/0x80 [ 34.092668] ? error_entry+0x72/0xd0 [ 34.096378] ? trace_hardirqs_off_caller+0x6e/0x210 [ 34.101375] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.106197] invalid_op+0x14/0x20 [ 34.109633] RIP: 0010:generic_make_request_checks+0x17d9/0x22e0 [ 34.115670] Code: ca 0a 00 00 45 8b b6 e4 04 00 00 48 8d 74 24 68 48 89 ef e8 d9 2b 06 00 48 c7 c7 00 06 b2 88 48 89 c6 44 89 f2 e8 d2 bc ce fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 34.134552] RSP: 0018:ffff88809fdef360 EFLAGS: 00010282 [ 34.139924] RAX: 0000000000000000 RBX: ffff8880adc5a0c0 RCX: 0000000000000000 [ 34.147189] RDX: 0000000000000000 RSI: ffffffff814fdd11 RDI: ffffed1013fbde5e [ 34.154455] RBP: ffff8880aa545d40 R08: 0000000000000001 R09: 0000000000000000 [ 34.161715] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880aa545d70 [ 34.169090] R13: ffff8880aa545d48 R14: 0000000000000000 R15: 0000000000000000 [ 34.176359] ? vprintk_func+0x81/0x17e [ 34.180241] ? should_fail_bio.isra.0+0xa0/0xa0 [ 34.184892] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 34.189889] ? kmem_cache_alloc+0x315/0x370 [ 34.194192] generic_make_request+0x23f/0xdf0 [ 34.198669] ? blk_put_request+0x110/0x110 [ 34.202886] ? sb_mark_inode_writeback+0xc8/0x490 [ 34.207713] submit_bio+0xb1/0x430 [ 34.211267] ? generic_make_request+0xdf0/0xdf0 [ 34.215924] ? check_preemption_disabled+0x41/0x280 [ 34.220931] ? guard_bio_eod+0x2a0/0x640 [ 34.225063] submit_bh_wbc+0x5a7/0x760 [ 34.228950] __block_write_full_page+0x71a/0xf60 [ 34.233690] ? block_llseek+0xc0/0xc0 [ 34.237581] block_write_full_page+0x1f3/0x260 [ 34.242151] ? block_llseek+0xc0/0xc0 [ 34.245949] __writepage+0x5e/0xe0 [ 34.249467] write_cache_pages+0x802/0x12d0 [ 34.253772] ? tag_pages_for_writeback+0x2f0/0x2f0 [ 34.258706] ? clear_page_dirty_for_io+0xee0/0xee0 [ 34.263706] ? lock_acquire+0x170/0x3c0 [ 34.267660] ? __bpf_address_lookup+0x330/0x330 [ 34.272327] ? __lock_acquire+0x6de/0x3ff0 [ 34.276544] ? blkdev_readpages+0x30/0x30 [ 34.280675] generic_writepages+0xdb/0x150 [ 34.284897] ? dirty_poll_interval.part.0+0x30/0x30 [ 34.289890] ? mark_held_locks+0xf0/0xf0 [ 34.293935] do_writepages+0xe5/0x290 [ 34.297733] ? page_writeback_cpu_online+0x10/0x10 [ 34.302643] ? do_raw_spin_unlock+0x171/0x230 [ 34.307119] ? _raw_spin_unlock+0x29/0x40 [ 34.311259] ? wbc_attach_and_unlock_inode+0x11d/0x9e0 [ 34.316530] __filemap_fdatawrite_range+0x27d/0x350 [ 34.321537] ? delete_from_page_cache_batch+0xcc0/0xcc0 [ 34.326905] ? lock_downgrade+0x720/0x720 [ 34.331041] ? locks_remove_file+0x2c8/0x450 [ 34.335440] ? blkdev_put+0x30/0x520 [ 34.339138] ? blkdev_put+0x520/0x520 [ 34.342926] filemap_write_and_wait+0x42/0xd0 [ 34.347403] __blkdev_put+0x682/0x870 [ 34.351207] ? fsync_bdev+0xc0/0xc0 [ 34.354825] ? locks_remove_file+0x2cd/0x450 [ 34.359400] ? blkdev_put+0x85/0x520 [ 34.363100] ? blkdev_put+0x520/0x520 [ 34.366882] blkdev_close+0x86/0xb0 [ 34.370492] __fput+0x2ce/0x890 [ 34.373757] task_work_run+0x148/0x1c0 [ 34.377628] do_exit+0xbed/0x2be0 [ 34.381064] ? lock_downgrade+0x720/0x720 [ 34.385194] ? mm_update_next_owner+0x650/0x650 [ 34.389860] ? up_read+0x17/0x110 [ 34.393308] ? __do_page_fault+0x180/0xd60 [ 34.397541] do_group_exit+0x125/0x310 [ 34.401413] __x64_sys_exit_group+0x3a/0x50 [ 34.405715] do_syscall_64+0xf9/0x620 [ 34.409498] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.414669] RIP: 0033:0x43eec8 [ 34.417848] Code: Bad RIP value. [ 34.421293] RSP: 002b:00007ffecebc3de8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 34.428979] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043eec8 [ 34.436342] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 34.443596] RBP: 00000000004be6c8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 34.450847] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000001 [ 34.458115] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 34.466039] Kernel Offset: disabled [ 34.469721] Rebooting in 86400 seconds..