[ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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. [ 47.800783][ T6721] sshd (6721) used greatest stack depth: 23560 bytes left Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.128' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 55.436738][ T6821] ------------[ cut here ]------------ [ 55.442201][ T6821] Trying to write to read-only block-device nullb0 (partno 0) [ 55.450606][ T6821] WARNING: CPU: 0 PID: 6821 at block/blk-core.c:857 submit_bio_checks+0x1aba/0x1f70 [ 55.460587][ T6821] Kernel panic - not syncing: panic_on_warn set ... [ 55.467166][ T6821] CPU: 0 PID: 6821 Comm: syz-executor914 Not tainted 5.8.0-rc3-next-20200703-syzkaller #0 [ 55.477064][ T6821] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.487093][ T6821] Call Trace: [ 55.490452][ T6821] dump_stack+0x18f/0x20d [ 55.494758][ T6821] panic+0x2e3/0x75c [ 55.498628][ T6821] ? __warn_printk+0xf3/0xf3 [ 55.503195][ T6821] ? __warn.cold+0x5/0x45 [ 55.507498][ T6821] ? __warn+0xd6/0x1f2 [ 55.511539][ T6821] ? submit_bio_checks+0x1aba/0x1f70 [ 55.516796][ T6821] __warn.cold+0x20/0x45 [ 55.521008][ T6821] ? wake_up_klogd.part.0+0x8c/0xc0 [ 55.526178][ T6821] ? submit_bio_checks+0x1aba/0x1f70 [ 55.531468][ T6821] report_bug+0x1bd/0x210 [ 55.535783][ T6821] handle_bug+0x38/0x90 [ 55.539910][ T6821] exc_invalid_op+0x13/0x40 [ 55.544385][ T6821] asm_exc_invalid_op+0x12/0x20 [ 55.549207][ T6821] RIP: 0010:submit_bio_checks+0x1aba/0x1f70 [ 55.555072][ T6821] Code: 04 00 00 45 8b a4 24 a4 05 00 00 48 8d 74 24 68 48 89 ef e8 b8 21 fe ff 48 c7 c7 e0 ce 91 88 48 89 c6 44 89 e2 e8 08 df c0 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 55.574648][ T6821] RSP: 0018:ffffc90001277338 EFLAGS: 00010286 [ 55.580683][ T6821] RAX: 0000000000000000 RBX: ffff8880a0cb2240 RCX: 0000000000000000 [ 55.588627][ T6821] RDX: ffff8880a8ebc180 RSI: ffffffff815d7d27 RDI: fffff5200024ee59 [ 55.596570][ T6821] RBP: ffff8880a03101c0 R08: 0000000000000001 R09: ffff8880ae6318e7 [ 55.604513][ T6821] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 55.612457][ T6821] R13: ffff8880a03101c8 R14: 0000000000000000 R15: ffff8880a03101e8 [ 55.620413][ T6821] ? vprintk_func+0x97/0x1a6 [ 55.624980][ T6821] ? submit_bio_checks+0x1aba/0x1f70 [ 55.630237][ T6821] ? mark_lock+0xbc/0x1710 [ 55.634625][ T6821] ? blk_update_request+0x1230/0x1230 [ 55.639967][ T6821] ? __lock_acquire+0xc1e/0x56e0 [ 55.644880][ T6821] submit_bio_noacct+0x89/0x12d0 [ 55.649800][ T6821] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 55.655754][ T6821] ? blk_queue_enter+0xcd0/0xcd0 [ 55.660660][ T6821] ? find_held_lock+0x2d/0x110 [ 55.665398][ T6821] ? bio_associate_blkg_from_css+0x5f3/0x1080 [ 55.671434][ T6821] ? lock_acquire+0x1f1/0xad0 [ 55.676081][ T6821] ? bio_truncate+0x70/0x70 [ 55.680559][ T6821] submit_bio+0x263/0x5b0 [ 55.684862][ T6821] ? submit_bio_noacct+0x12d0/0x12d0 [ 55.690118][ T6821] ? lock_is_held_type+0xb0/0xe0 [ 55.695031][ T6821] submit_bh_wbc+0x685/0x8e0 [ 55.699595][ T6821] __block_write_full_page+0x837/0x12e0 [ 55.705112][ T6821] ? bdev_evict_inode+0x410/0x410 [ 55.710107][ T6821] block_write_full_page+0x214/0x270 [ 55.715363][ T6821] ? bdev_evict_inode+0x410/0x410 [ 55.720357][ T6821] __writepage+0x60/0x170 [ 55.724662][ T6821] write_cache_pages+0x736/0x11b0 [ 55.729658][ T6821] ? tag_pages_for_writeback+0x450/0x450 [ 55.735265][ T6821] ? clear_page_dirty_for_io+0x920/0x920 [ 55.740880][ T6821] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 55.746834][ T6821] ? find_held_lock+0x2d/0x110 [ 55.751570][ T6821] ? __lock_acquire+0x16e3/0x56e0 [ 55.756570][ T6821] ? blkdev_readahead+0x20/0x20 [ 55.761403][ T6821] generic_writepages+0xe2/0x150 [ 55.766314][ T6821] ? write_cache_pages+0x11b0/0x11b0 [ 55.771585][ T6821] ? find_held_lock+0x2d/0x110 [ 55.776320][ T6821] ? wbc_attach_and_unlock_inode+0x11d/0x9d0 [ 55.782271][ T6821] do_writepages+0xec/0x290 [ 55.786747][ T6821] ? writeback_set_ratelimit+0x150/0x150 [ 55.792349][ T6821] ? do_raw_spin_lock+0x120/0x2b0 [ 55.797345][ T6821] ? do_raw_spin_unlock+0x171/0x230 [ 55.802515][ T6821] ? _raw_spin_unlock+0x24/0x40 [ 55.807350][ T6821] ? wbc_attach_and_unlock_inode+0x11d/0x9d0 [ 55.813390][ T6821] __filemap_fdatawrite_range+0x2a1/0x380 [ 55.819094][ T6821] ? lock_is_held_type+0xb0/0xe0 [ 55.824004][ T6821] ? delete_from_page_cache_batch+0xe20/0xe20 [ 55.830051][ T6821] ? lock_downgrade+0x820/0x820 [ 55.834872][ T6821] ? blkdev_put+0x30/0x520 [ 55.839264][ T6821] filemap_write_and_wait_range+0xe1/0x1c0 [ 55.845042][ T6821] __blkdev_put+0x69a/0x890 [ 55.849518][ T6821] ? fsync_bdev+0xd0/0xd0 [ 55.853821][ T6821] ? locks_remove_file+0x319/0x580 [ 55.858905][ T6821] ? blkdev_put+0x520/0x520 [ 55.863379][ T6821] ? blkdev_put+0x85/0x520 [ 55.867781][ T6821] ? blkdev_put+0x520/0x520 [ 55.872257][ T6821] blkdev_close+0x8c/0xb0 [ 55.876563][ T6821] __fput+0x33c/0x880 [ 55.880519][ T6821] task_work_run+0xdd/0x190 [ 55.885008][ T6821] do_exit+0xb72/0x2a40 [ 55.889137][ T6821] ? blkdev_ioctl+0xc9/0x700 [ 55.893719][ T6821] ? mm_update_next_owner+0x7a0/0x7a0 [ 55.899073][ T6821] do_group_exit+0x125/0x310 [ 55.903634][ T6821] __x64_sys_exit_group+0x3a/0x50 [ 55.908630][ T6821] do_syscall_64+0x60/0xe0 [ 55.913032][ T6821] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.918896][ T6821] RIP: 0033:0x43ee48 [ 55.922760][ T6821] Code: Bad RIP value. [ 55.926796][ T6821] RSP: 002b:00007ffdd4c8f808 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 55.935178][ T6821] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee48 [ 55.943132][ T6821] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 55.951078][ T6821] RBP: 00000000004be648 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 55.959030][ T6821] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000001 [ 55.966977][ T6821] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 55.976246][ T6821] Kernel Offset: disabled [ 55.980608][ T6821] Rebooting in 86400 seconds..