[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.222' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 33.906973] ------------[ cut here ]------------ [ 33.911746] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 33.921527] WARNING: CPU: 1 PID: 8099 at block/blk-core.c:2183 generic_make_request_checks+0x17d9/0x22e0 [ 33.931227] Kernel panic - not syncing: panic_on_warn set ... [ 33.931227] [ 33.938593] CPU: 1 PID: 8099 Comm: syz-executor892 Not tainted 4.19.208-syzkaller #0 [ 33.946457] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.955809] Call Trace: [ 33.958380] dump_stack+0x1fc/0x2ef [ 33.961994] panic+0x26a/0x50e [ 33.965174] ? __warn_printk+0xf3/0xf3 [ 33.969065] ? generic_make_request_checks+0x17d9/0x22e0 [ 33.974499] ? __probe_kernel_read+0x130/0x1b0 [ 33.979063] ? __warn.cold+0x5/0x5a [ 33.982671] ? __warn+0xe4/0x200 [ 33.986029] ? generic_make_request_checks+0x17d9/0x22e0 [ 33.991466] __warn.cold+0x20/0x5a [ 33.994986] ? io_schedule_timeout+0x140/0x140 [ 33.999555] ? generic_make_request_checks+0x17d9/0x22e0 [ 34.004986] report_bug+0x262/0x2b0 [ 34.008604] do_error_trap+0x1d7/0x310 [ 34.012525] ? math_error+0x310/0x310 [ 34.016323] ? __irq_work_queue_local+0x101/0x160 [ 34.021149] ? irq_work_queue+0x29/0x80 [ 34.025106] ? error_entry+0x72/0xd0 [ 34.028805] ? trace_hardirqs_off_caller+0x6e/0x210 [ 34.033822] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.039082] invalid_op+0x14/0x20 [ 34.042525] RIP: 0010:generic_make_request_checks+0x17d9/0x22e0 [ 34.048570] 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 3c 7e 91 04 <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 34.067466] RSP: 0018:ffff88808cde7368 EFLAGS: 00010286 [ 34.072813] RAX: 0000000000000000 RBX: ffff8880adcfc040 RCX: 0000000000000000 [ 34.080150] RDX: 0000000000000000 RSI: ffffffff814dfe11 RDI: ffffed10119bce5f [ 34.087400] RBP: ffff8880a08857c0 R08: 0000000000000001 R09: 0000000000000000 [ 34.094657] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880a08857f0 [ 34.101906] R13: ffff8880a08857c8 R14: 0000000000000000 R15: 0000000000000000 [ 34.109170] ? vprintk_func+0x81/0x180 [ 34.113043] ? generic_make_request_checks+0x17d9/0x22e0 [ 34.118492] ? should_fail_bio.isra.0+0xa0/0xa0 [ 34.123144] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 34.128150] ? kmem_cache_alloc+0x315/0x370 [ 34.132471] generic_make_request+0x23f/0xdf0 [ 34.136950] ? blk_put_request+0x110/0x110 [ 34.141169] ? sb_mark_inode_writeback+0xc8/0x490 [ 34.145999] submit_bio+0xb1/0x430 [ 34.149615] ? generic_make_request+0xdf0/0xdf0 [ 34.154334] ? check_preemption_disabled+0x41/0x280 [ 34.159338] ? guard_bio_eod+0x2a0/0x650 [ 34.163384] submit_bh_wbc+0x5a7/0x760 [ 34.167256] __block_write_full_page+0x71a/0xf60 [ 34.172014] ? block_llseek+0xc0/0xc0 [ 34.175799] block_write_full_page+0x1f3/0x260 [ 34.180374] ? block_llseek+0xc0/0xc0 [ 34.184159] __writepage+0x5e/0xe0 [ 34.187683] write_cache_pages+0x802/0x12d0 [ 34.191990] ? tag_pages_for_writeback+0x2f0/0x2f0 [ 34.196900] ? clear_page_dirty_for_io+0xee0/0xee0 [ 34.201826] ? deref_stack_reg+0x134/0x1d0 [ 34.206041] ? get_reg+0x176/0x1f0 [ 34.209569] ? __read_once_size_nocheck.constprop.0+0x10/0x10 [ 34.215434] ? deref_stack_reg+0x1d0/0x1d0 [ 34.219652] ? __lock_acquire+0x6de/0x3ff0 [ 34.223879] ? blkdev_readpages+0x30/0x30 [ 34.228010] generic_writepages+0xdb/0x150 [ 34.232242] ? dirty_poll_interval.part.0+0x30/0x30 [ 34.237238] ? mark_held_locks+0xf0/0xf0 [ 34.241375] do_writepages+0xe5/0x290 [ 34.245164] ? page_writeback_cpu_online+0x10/0x10 [ 34.250079] ? do_raw_spin_unlock+0x171/0x230 [ 34.254565] ? _raw_spin_unlock+0x29/0x40 [ 34.258708] ? wbc_attach_and_unlock_inode+0x11d/0x9e0 [ 34.263970] __filemap_fdatawrite_range+0x27d/0x350 [ 34.268982] ? blkdev_put+0x30/0x520 [ 34.272686] ? delete_from_page_cache_batch+0xcc0/0xcc0 [ 34.278050] ? lock_downgrade+0x720/0x720 [ 34.282253] ? locks_remove_file+0x2c8/0x450 [ 34.286649] ? blkdev_put+0x30/0x520 [ 34.290342] ? blkdev_put+0x520/0x520 [ 34.294121] filemap_write_and_wait+0x42/0xd0 [ 34.298597] __blkdev_put+0x682/0x870 [ 34.302400] ? fsync_bdev+0xc0/0xc0 [ 34.306019] ? locks_remove_file+0x2cd/0x450 [ 34.310411] ? blkdev_put+0x85/0x520 [ 34.314104] ? blkdev_put+0x520/0x520 [ 34.317887] blkdev_close+0x86/0xb0 [ 34.321505] __fput+0x2ce/0x890 [ 34.324781] task_work_run+0x148/0x1c0 [ 34.328652] do_exit+0xbf3/0x2be0 [ 34.332095] ? try_to_wake_up+0x733/0x1050 [ 34.336321] ? do_group_exit+0x2a1/0x310 [ 34.340362] ? mm_update_next_owner+0x650/0x650 [ 34.345013] ? lock_downgrade+0x720/0x720 [ 34.349139] ? lock_acquire+0x170/0x3c0 [ 34.353112] ? _raw_spin_unlock_irq+0x24/0x80 [ 34.357590] do_group_exit+0x125/0x310 [ 34.361462] __x64_sys_exit_group+0x3a/0x50 [ 34.365769] do_syscall_64+0xf9/0x620 [ 34.369560] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.374729] RIP: 0033:0x7f9eac9e84d9 [ 34.378423] Code: Bad RIP value. [ 34.381872] RSP: 002b:00007ffd0d9eed48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 34.389654] RAX: ffffffffffffffda RBX: 00007f9eaca713b0 RCX: 00007f9eac9e84d9 [ 34.396916] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 34.404179] RBP: 0000000000000000 R08: ffffffffffffffb8 R09: 0000000000f0b5ff [ 34.411434] R10: 00007ffd0d9eedd0 R11: 0000000000000246 R12: 00007f9eaca713b0 [ 34.418685] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 34.426368] Kernel Offset: disabled [ 34.430026] Rebooting in 86400 seconds..