[ 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 '10.128.0.75' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 108.978520] ------------[ cut here ]------------ [ 108.983470] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 108.993569] WARNING: CPU: 1 PID: 8158 at block/blk-core.c:2182 generic_make_request_checks+0x17d9/0x22e0 [ 109.003280] Kernel panic - not syncing: panic_on_warn set ... [ 109.003280] [ 109.010635] CPU: 1 PID: 8158 Comm: syz-executor900 Not tainted 4.19.160-syzkaller #0 [ 109.018501] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 109.029511] Call Trace: [ 109.032120] dump_stack+0x1fc/0x2fe [ 109.035755] panic+0x26a/0x50e [ 109.038936] ? __warn_printk+0xf3/0xf3 [ 109.042921] ? generic_make_request_checks+0x17d9/0x22e0 [ 109.048369] ? __probe_kernel_read+0x130/0x1b0 [ 109.052944] ? __warn.cold+0x5/0x61 [ 109.056569] ? __warn+0xe4/0x200 [ 109.059942] ? generic_make_request_checks+0x17d9/0x22e0 [ 109.065390] __warn.cold+0x20/0x61 [ 109.068934] ? generic_make_request_checks+0x17d9/0x22e0 [ 109.074380] report_bug+0x262/0x2b0 [ 109.078022] do_error_trap+0x1d7/0x310 [ 109.081895] ? math_error+0x310/0x310 [ 109.085677] ? __irq_work_queue_local+0x101/0x160 [ 109.090522] ? irq_work_queue+0x29/0x80 [ 109.094479] ? error_entry+0x72/0xd0 [ 109.098186] ? trace_hardirqs_off_caller+0x6e/0x210 [ 109.103185] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 109.108032] invalid_op+0x14/0x20 [ 109.111493] RIP: 0010:generic_make_request_checks+0x17d9/0x22e0 [ 109.117544] Code: ca 0a 00 00 45 8b b6 e4 04 00 00 48 8d 74 24 68 48 89 ef e8 39 2c 06 00 48 c7 c7 a0 ff b1 88 48 89 c6 44 89 f2 e8 f2 ce ce fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 109.136425] RSP: 0018:ffff888094cef360 EFLAGS: 00010282 [ 109.141771] RAX: 0000000000000000 RBX: ffff8880ae0d60c0 RCX: 0000000000000000 [ 109.149028] RDX: 0000000000000000 RSI: ffffffff814fdb91 RDI: ffffed101299de5e [ 109.156293] RBP: ffff8880a464aa80 R08: 0000000000000001 R09: 0000000000000000 [ 109.163543] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880a464aab0 [ 109.170793] R13: ffff8880a464aa88 R14: 0000000000000000 R15: 0000000000000000 [ 109.178063] ? vprintk_func+0x81/0x17e [ 109.181942] ? should_fail_bio.isra.0+0xa0/0xa0 [ 109.186631] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 109.191660] ? kmem_cache_alloc+0x315/0x370 [ 109.195992] generic_make_request+0x23f/0xdf0 [ 109.200511] ? blk_put_request+0x110/0x110 [ 109.204734] ? sb_mark_inode_writeback+0xc8/0x490 [ 109.209565] submit_bio+0xb1/0x430 [ 109.213100] ? generic_make_request+0xdf0/0xdf0 [ 109.217749] ? check_preemption_disabled+0x41/0x280 [ 109.222836] ? guard_bio_eod+0x2a0/0x640 [ 109.226880] submit_bh_wbc+0x5a7/0x760 [ 109.230752] __block_write_full_page+0x71a/0xf60 [ 109.235490] ? block_llseek+0xc0/0xc0 [ 109.239275] block_write_full_page+0x1f3/0x260 [ 109.243836] ? block_llseek+0xc0/0xc0 [ 109.247705] __writepage+0x5e/0xe0 [ 109.251242] write_cache_pages+0x802/0x12d0 [ 109.255631] ? tag_pages_for_writeback+0x2f0/0x2f0 [ 109.260630] ? clear_page_dirty_for_io+0xee0/0xee0 [ 109.265539] ? unwind_next_frame+0x10a9/0x1c60 [ 109.270192] ? __save_stack_trace+0x72/0x190 [ 109.274587] ? __lock_acquire+0x6de/0x3ff0 [ 109.278893] ? blkdev_readpages+0x30/0x30 [ 109.283201] generic_writepages+0xdb/0x150 [ 109.287417] ? dirty_poll_interval.part.0+0x30/0x30 [ 109.292424] ? mark_held_locks+0xf0/0xf0 [ 109.296574] do_writepages+0xe5/0x290 [ 109.300456] ? page_writeback_cpu_online+0x10/0x10 [ 109.305469] ? do_raw_spin_unlock+0x171/0x230 [ 109.309948] ? _raw_spin_unlock+0x29/0x40 [ 109.314079] ? wbc_attach_and_unlock_inode+0x11d/0x9e0 [ 109.319340] __filemap_fdatawrite_range+0x27d/0x350 [ 109.324338] ? delete_from_page_cache_batch+0xcc0/0xcc0 [ 109.329862] ? lock_downgrade+0x720/0x720 [ 109.334011] ? locks_remove_file+0x2c8/0x450 [ 109.338417] ? blkdev_put+0x30/0x520 [ 109.342210] ? blkdev_put+0x520/0x520 [ 109.345991] filemap_write_and_wait+0x42/0xd0 [ 109.350488] __blkdev_put+0x682/0x870 [ 109.354272] ? fsync_bdev+0xc0/0xc0 [ 109.357880] ? locks_remove_file+0x2cd/0x450 [ 109.362357] ? blkdev_put+0x85/0x520 [ 109.366052] ? blkdev_put+0x520/0x520 [ 109.369851] blkdev_close+0x86/0xb0 [ 109.373475] __fput+0x2ce/0x890 [ 109.376740] task_work_run+0x148/0x1c0 [ 109.380625] do_exit+0xbed/0x2be0 [ 109.384062] ? putname+0xe1/0x120 [ 109.387500] ? kmem_cache_free+0x226/0x260 [ 109.391730] ? mm_update_next_owner+0x650/0x650 [ 109.396379] ? putname+0xe1/0x120 [ 109.399827] ? do_sys_open+0x2bf/0x520 [ 109.403710] ? filp_open+0x70/0x70 [ 109.407234] do_group_exit+0x125/0x310 [ 109.411101] __x64_sys_exit_group+0x3a/0x50 [ 109.415421] do_syscall_64+0xf9/0x620 [ 109.419208] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 109.424480] RIP: 0033:0x43f308 [ 109.427672] Code: Bad RIP value. [ 109.431014] RSP: 002b:00007ffe6b97d218 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 109.438791] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f308 [ 109.446061] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 109.453343] RBP: 00000000004be9e8 R08: 00000000000000e7 R09: ffffffffffffffd4 [ 109.460707] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 109.467982] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 109.476303] Kernel Offset: disabled [ 109.479997] Rebooting in 86400 seconds..