[[0;32m OK [0m] Started Serial Getty on ttyS0.
[[0;32m OK [0m] Reached target Login Prompts.
[[0;32m OK [0m] Reached target Multi-User System.
[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.148' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 42.740925][ T6828] ------------[ cut here ]------------
[ 42.746535][ T6828] Trying to write to read-only block-device nullb0 (partno 0)
[ 42.754968][ T6828] WARNING: CPU: 1 PID: 6828 at block/blk-core.c:859 submit_bio_checks+0x1422/0x19e0
[ 42.764561][ T6828] Kernel panic - not syncing: panic_on_warn set ...
[ 42.771243][ T6828] CPU: 1 PID: 6828 Comm: syz-executor900 Not tainted 5.9.0-rc1-syzkaller #0
[ 42.780376][ T6828] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 42.790405][ T6828] Call Trace:
[ 42.793683][ T6828] dump_stack+0x1f0/0x31e
[ 42.797987][ T6828] panic+0x264/0x7a0
[ 42.801852][ T6828] ? __warn+0x102/0x250
[ 42.805978][ T6828] ? submit_bio_checks+0x1422/0x19e0
[ 42.811265][ T6828] ? submit_bio_checks+0x1422/0x19e0
[ 42.818266][ T6828] __warn+0x227/0x250
[ 42.822225][ T6828] ? submit_bio_checks+0x1422/0x19e0
[ 42.827493][ T6828] report_bug+0x1b1/0x2e0
[ 42.831800][ T6828] handle_bug+0x42/0x80
[ 42.835928][ T6828] exc_invalid_op+0x16/0x40
[ 42.840406][ T6828] asm_exc_invalid_op+0x12/0x20
[ 42.845232][ T6828] RIP: 0010:submit_bio_checks+0x1422/0x19e0
[ 42.851116][ T6828] Code: 48 b9 00 00 00 00 00 fc ff df 8a 04 08 84 c0 0f 85 ab 05 00 00 41 8b 14 24 48 c7 c7 ae 4c 15 89 4c 89 fe 31 c0 e8 8e b9 ba fd <0f> 0b 4c 8b 6c 24 10 4c 8b 7c 24 20 e9 ac f4 ff ff 44 89 f9 80 e1
[ 42.870712][ T6828] RSP: 0018:ffffc90001c07430 EFLAGS: 00010246
[ 42.876762][ T6828] RAX: 05ec74c8d25bb200 RBX: 0000000000000001 RCX: ffff8880972d23c0
[ 42.884719][ T6828] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
[ 42.892676][ T6828] RBP: ffffc90001c07500 R08: ffffffff815e2109 R09: ffffed1015d262c0
[ 42.900633][ T6828] R10: ffffed1015d262c0 R11: 0000000000000000 R12: ffff8880a08135a4
[ 42.908579][ T6828] R13: ffff8880a17d8440 R14: 1ffff110142fb089 R15: ffffc90001c074a0
[ 42.916534][ T6828] ? vprintk_emit+0x339/0x3c0
[ 42.921211][ T6828] submit_bio_noacct+0x36/0xf90
[ 42.926147][ T6828] ? rcu_lock_release+0x5/0x20
[ 42.930885][ T6828] submit_bio+0x1a4/0x620
[ 42.935190][ T6828] __block_write_full_page+0x8bb/0x1000
[ 42.940824][ T6828] ? mark_buffer_write_io_error+0x320/0x320
[ 42.946702][ T6828] ? blkdev_direct_IO+0xd0/0xd0
[ 42.951525][ T6828] __writepage+0x60/0x110
[ 42.955826][ T6828] write_cache_pages+0x8bb/0xda0
[ 42.960738][ T6828] ? generic_writepages+0xd0/0xd0
[ 42.965733][ T6828] ? locks_remove_posix+0x315/0x450
[ 42.970906][ T6828] generic_writepages+0x8f/0xd0
[ 42.975728][ T6828] ? blkdev_readpage+0x20/0x20
[ 42.980463][ T6828] do_writepages+0xda/0x1f0
[ 42.984958][ T6828] __filemap_fdatawrite_range+0x2a5/0x350
[ 42.990677][ T6828] filemap_write_and_wait_range+0xca/0x160
[ 42.996494][ T6828] __blkdev_put+0x111/0x7a0
[ 43.000995][ T6828] ? __mutex_unlock_slowpath+0x12d/0x590
[ 43.006626][ T6828] ? blkdev_put+0x2e0/0x3d0
[ 43.011130][ T6828] blkdev_close+0x7a/0xa0
[ 43.015455][ T6828] ? blkdev_open+0x2e0/0x2e0
[ 43.020040][ T6828] __fput+0x34f/0x7b0
[ 43.024030][ T6828] task_work_run+0x137/0x1c0
[ 43.028618][ T6828] do_exit+0x5f3/0x1f20
[ 43.032781][ T6828] ? trace_lock_release+0x137/0x1a0
[ 43.037956][ T6828] do_group_exit+0x161/0x2d0
[ 43.042518][ T6828] get_signal+0x13bb/0x1d50
[ 43.047014][ T6828] ? trace_lock_release+0x137/0x1a0
[ 43.052314][ T6828] ? up_write+0xe9/0x450
[ 43.056780][ T6828] arch_do_signal+0x33/0x610
[ 43.061360][ T6828] ? __se_sys_futex+0x2a7/0x390
[ 43.066291][ T6828] ? exit_to_user_mode_prepare+0x3d/0x1b0
[ 43.071993][ T6828] exit_to_user_mode_prepare+0x8d/0x1b0
[ 43.077521][ T6828] syscall_exit_to_user_mode+0x5e/0x1a0
[ 43.083051][ T6828] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 43.088918][ T6828] RIP: 0033:0x445949
[ 43.092781][ T6828] Code: Bad RIP value.
[ 43.096830][ T6828] RSP: 002b:00007f00d610adb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
[ 43.105225][ T6828] RAX: fffffffffffffe00 RBX: 00000000006dac38 RCX: 0000000000445949
[ 43.113170][ T6828] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dac38
[ 43.121118][ T6828] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000
[ 43.129082][ T6828] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c
[ 43.137027][ T6828] R13: 00007ffda417b05f R14: 00007f00d610b9c0 R15: 20c49ba5e353f7cf
[ 43.146654][ T6828] Kernel Offset: disabled
[ 43.151043][ T6828] Rebooting in 86400 seconds..