[ 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 '10.128.1.32' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.933993] ------------[ cut here ]------------ [ 34.938795] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 34.948349] WARNING: CPU: 0 PID: 8100 at block/blk-core.c:2183 generic_make_request_checks+0x17d9/0x22e0 [ 34.957975] Kernel panic - not syncing: panic_on_warn set ... [ 34.957975] [ 34.965328] CPU: 0 PID: 8100 Comm: syz-executor480 Not tainted 4.19.211-syzkaller #0 [ 34.973205] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.982648] Call Trace: [ 34.985230] dump_stack+0x1fc/0x2ef [ 34.988867] panic+0x26a/0x50e [ 34.992042] ? __warn_printk+0xf3/0xf3 [ 34.995939] ? generic_make_request_checks+0x17d9/0x22e0 [ 35.001371] ? __probe_kernel_read+0x130/0x1b0 [ 35.005934] ? __warn.cold+0x5/0x5a [ 35.009541] ? __warn+0xe4/0x200 [ 35.012891] ? generic_make_request_checks+0x17d9/0x22e0 [ 35.018326] __warn.cold+0x20/0x5a [ 35.022371] ? generic_make_request_checks+0x17d9/0x22e0 [ 35.027804] report_bug+0x262/0x2b0 [ 35.031414] do_error_trap+0x1d7/0x310 [ 35.035287] ? math_error+0x310/0x310 [ 35.039069] ? __irq_work_queue_local+0x101/0x160 [ 35.043892] ? irq_work_queue+0x29/0x80 [ 35.047848] ? error_entry+0x72/0xd0 [ 35.051564] ? trace_hardirqs_off_caller+0x6e/0x210 [ 35.056565] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.061408] invalid_op+0x14/0x20 [ 35.064845] RIP: 0010:generic_make_request_checks+0x17d9/0x22e0 [ 35.070895] Code: ca 0a 00 00 45 8b b6 1c 05 00 00 48 8d 74 24 68 48 89 ef e8 b9 14 06 00 48 c7 c7 00 29 b2 88 48 89 c6 44 89 f2 e8 4c 94 91 04 <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 35.089779] RSP: 0018:ffff8880b2a47368 EFLAGS: 00010286 [ 35.095135] RAX: 0000000000000000 RBX: ffff8880ade34040 RCX: 0000000000000000 [ 35.102385] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1016548e5f [ 35.109649] RBP: ffff8880a9bf11c0 R08: 0000000000000001 R09: 0000000000000000 [ 35.116997] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880a9bf11f0 [ 35.124249] R13: ffff8880a9bf11c8 R14: 0000000000000000 R15: 0000000000000000 [ 35.131512] ? vprintk_func+0x81/0x180 [ 35.135387] ? generic_make_request_checks+0x17d9/0x22e0 [ 35.140819] ? should_fail_bio.isra.0+0xa0/0xa0 [ 35.145485] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 35.150481] ? kmem_cache_alloc+0x315/0x370 [ 35.154792] generic_make_request+0x23f/0xdf0 [ 35.159274] ? blk_put_request+0x110/0x110 [ 35.163494] ? sb_mark_inode_writeback+0xc8/0x490 [ 35.168391] submit_bio+0xb1/0x430 [ 35.171917] ? generic_make_request+0xdf0/0xdf0 [ 35.176569] ? check_preemption_disabled+0x41/0x280 [ 35.181567] ? guard_bio_eod+0x2a0/0x650 [ 35.185611] submit_bh_wbc+0x5a7/0x760 [ 35.189486] __block_write_full_page+0x71a/0xf60 [ 35.194225] ? block_llseek+0xc0/0xc0 [ 35.198008] block_write_full_page+0x1f3/0x260 [ 35.202567] ? block_llseek+0xc0/0xc0 [ 35.206364] __writepage+0x5e/0xe0 [ 35.209885] write_cache_pages+0x802/0x12d0 [ 35.214192] ? tag_pages_for_writeback+0x2f0/0x2f0 [ 35.219104] ? clear_page_dirty_for_io+0xee0/0xee0 [ 35.224033] ? get_reg+0x1f0/0x1f0 [ 35.227561] ? __lock_acquire+0x6de/0x3ff0 [ 35.231779] ? __save_stack_trace+0x72/0x190 [ 35.236170] ? blkdev_readpages+0x30/0x30 [ 35.240298] generic_writepages+0xdb/0x150 [ 35.244522] ? dirty_poll_interval.part.0+0x30/0x30 [ 35.249517] ? mark_held_locks+0xf0/0xf0 [ 35.253565] do_writepages+0xe5/0x290 [ 35.257349] ? page_writeback_cpu_online+0x10/0x10 [ 35.262259] ? do_raw_spin_unlock+0x171/0x230 [ 35.266755] ? _raw_spin_unlock+0x29/0x40 [ 35.270886] ? wbc_attach_and_unlock_inode+0x11d/0x9e0 [ 35.276145] __filemap_fdatawrite_range+0x27d/0x350 [ 35.281154] ? blkdev_put+0x30/0x520 [ 35.284846] ? delete_from_page_cache_batch+0xcc0/0xcc0 [ 35.290195] ? lock_downgrade+0x720/0x720 [ 35.294326] ? locks_remove_file+0x2c8/0x450 [ 35.298713] ? blkdev_put+0x30/0x520 [ 35.302509] ? blkdev_put+0x520/0x520 [ 35.306313] filemap_write_and_wait+0x42/0xd0 [ 35.310790] __blkdev_put+0x682/0x870 [ 35.314587] ? fsync_bdev+0xc0/0xc0 [ 35.318192] ? locks_remove_file+0x2cd/0x450 [ 35.322597] ? blkdev_put+0x85/0x520 [ 35.326293] ? blkdev_put+0x520/0x520 [ 35.330074] blkdev_close+0x86/0xb0 [ 35.333773] __fput+0x2ce/0x890 [ 35.337054] task_work_run+0x148/0x1c0 [ 35.340926] do_exit+0xbf3/0x2be0 [ 35.344456] ? lock_downgrade+0x720/0x720 [ 35.348587] ? mm_update_next_owner+0x650/0x650 [ 35.353240] ? up_read+0x17/0x110 [ 35.356677] ? __do_page_fault+0x180/0xd60 [ 35.360895] do_group_exit+0x125/0x310 [ 35.364764] __x64_sys_exit_group+0x3a/0x50 [ 35.369065] do_syscall_64+0xf9/0x620 [ 35.372851] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.378021] RIP: 0033:0x7ff440a9cc09 [ 35.381721] Code: Bad RIP value. [ 35.385066] RSP: 002b:00007ffd5b63b578 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 35.392771] RAX: ffffffffffffffda RBX: 00007ff440b10270 RCX: 00007ff440a9cc09 [ 35.400018] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 35.407268] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000 [ 35.414520] R10: 0000000000000004 R11: 0000000000000246 R12: 00007ff440b10270 [ 35.421790] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 35.429425] Kernel Offset: disabled [ 35.433102] Rebooting in 86400 seconds..