[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.708691][ T26] audit: type=1800 audit(1555607463.847:25): pid=7761 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.728317][ T26] audit: type=1800 audit(1555607463.847:26): pid=7761 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.748695][ T26] audit: type=1800 audit(1555607463.847:27): pid=7761 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.137' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 50.176466][ T7914] ------------[ cut here ]------------ [ 50.182339][ T7914] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 50.182665][ T7914] WARNING: CPU: 0 PID: 7914 at block/blk-core.c:801 generic_make_request_checks+0x1c2f/0x2090 [ 50.202183][ T7914] Kernel panic - not syncing: panic_on_warn set ... [ 50.208803][ T7914] CPU: 0 PID: 7914 Comm: syz-executor910 Not tainted 5.1.0-rc5+ #73 [ 50.216825][ T7914] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.227027][ T7914] Call Trace: [ 50.230739][ T7914] dump_stack+0x172/0x1f0 [ 50.235086][ T7914] ? generic_make_request_checks+0x1bd0/0x2090 [ 50.241283][ T7914] panic+0x2cb/0x65c [ 50.245291][ T7914] ? __warn_printk+0xf3/0xf3 [ 50.249905][ T7914] ? generic_make_request_checks+0x1c2f/0x2090 [ 50.262444][ T7914] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.268702][ T7914] ? __warn.cold+0x5/0x45 [ 50.273092][ T7914] ? __warn+0xe8/0x1d0 [ 50.277166][ T7914] ? generic_make_request_checks+0x1c2f/0x2090 [ 50.283360][ T7914] __warn.cold+0x20/0x45 [ 50.287615][ T7914] ? vprintk_emit+0x1ce/0x6d0 [ 50.292296][ T7914] ? generic_make_request_checks+0x1c2f/0x2090 [ 50.298467][ T7914] report_bug+0x263/0x2b0 [ 50.302830][ T7914] do_error_trap+0x11b/0x200 [ 50.307438][ T7914] do_invalid_op+0x37/0x50 [ 50.311866][ T7914] ? generic_make_request_checks+0x1c2f/0x2090 [ 50.318058][ T7914] invalid_op+0x14/0x20 [ 50.322245][ T7914] RIP: 0010:generic_make_request_checks+0x1c2f/0x2090 [ 50.329013][ T7914] Code: 00 00 44 8b ab b4 04 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 c3 8a 05 00 48 c7 c7 60 02 a0 87 48 89 c6 44 89 ea e8 4f 96 25 fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 50.348662][ T7914] RSP: 0018:ffff88808ba771e0 EFLAGS: 00010286 [ 50.354765][ T7914] RAX: 0000000000000000 RBX: ffff8880a313d100 RCX: 0000000000000000 [ 50.366762][ T7914] RDX: 0000000000000000 RSI: ffffffff815afcb6 RDI: ffffed101174ee2e [ 50.374766][ T7914] RBP: ffff88808ba772e0 R08: ffff888085e48240 R09: ffffed1015d03ef1 [ 50.382759][ T7914] R10: ffffed1015d03ef0 R11: ffff8880ae81f787 R12: ffff8880a687e088 [ 50.390735][ T7914] R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a687e080 [ 50.398744][ T7914] ? vprintk_func+0x86/0x189 [ 50.403366][ T7914] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 50.410317][ T7914] generic_make_request+0x24c/0x12d0 [ 50.415610][ T7914] ? find_held_lock+0x35/0x130 [ 50.420383][ T7914] ? bio_associate_blkg_from_css+0x4e5/0x990 [ 50.426376][ T7914] ? blk_queue_enter+0xe90/0xe90 [ 50.431347][ T7914] ? lock_downgrade+0x880/0x880 [ 50.436219][ T7914] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.442482][ T7914] submit_bio+0xba/0x480 [ 50.446746][ T7914] ? submit_bio+0xba/0x480 [ 50.451164][ T7914] ? generic_make_request+0x12d0/0x12d0 [ 50.456746][ T7914] ? bio_reset+0x3b0/0x3b0 [ 50.461186][ T7914] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 50.466925][ T7914] ? guard_bio_eod+0x295/0x6e0 [ 50.471680][ T7914] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 50.477392][ T7914] ? wbc_account_io+0x17e/0x2a0 [ 50.482236][ T7914] submit_bh_wbc+0x5f7/0x7f0 [ 50.486838][ T7914] __block_write_full_page+0x771/0x1020 [ 50.492372][ T7914] ? check_disk_change+0x140/0x140 [ 50.497500][ T7914] block_write_full_page+0x21f/0x270 [ 50.502786][ T7914] ? check_disk_change+0x140/0x140 [ 50.507897][ T7914] blkdev_writepage+0x25/0x30 [ 50.512567][ T7914] __writepage+0x67/0xe0 [ 50.516826][ T7914] write_cache_pages+0x8af/0x1560 [ 50.521871][ T7914] ? __wb_update_bandwidth+0x670/0x670 [ 50.527344][ T7914] ? clear_page_dirty_for_io+0xff0/0xff0 [ 50.532982][ T7914] ? lock_downgrade+0x880/0x880 [ 50.537833][ T7914] ? trace_hardirqs_off+0x62/0x220 [ 50.542965][ T7914] ? ep_poll_callback+0x730/0xe70 [ 50.547987][ T7914] ? find_held_lock+0x35/0x130 [ 50.552824][ T7914] ? ep_poll_callback+0x730/0xe70 [ 50.557873][ T7914] generic_writepages+0xed/0x160 [ 50.562818][ T7914] ? write_cache_pages+0x1560/0x1560 [ 50.568095][ T7914] ? __lock_acquire+0x548/0x3fb0 [ 50.576161][ T7914] ? mark_held_locks+0xf0/0xf0 [ 50.580919][ T7914] ? wbc_attach_and_unlock_inode+0x51a/0x930 [ 50.586901][ T7914] ? find_held_lock+0x35/0x130 [ 50.591661][ T7914] ? blkdev_readpages+0x40/0x40 [ 50.596502][ T7914] blkdev_writepages+0x1e/0x30 [ 50.601261][ T7914] do_writepages+0xfc/0x2a0 [ 50.605775][ T7914] ? page_writeback_cpu_online+0x20/0x20 [ 50.611416][ T7914] ? kasan_check_read+0x11/0x20 [ 50.616261][ T7914] ? do_raw_spin_unlock+0x57/0x270 [ 50.621376][ T7914] ? _raw_spin_unlock+0x2d/0x50 [ 50.626251][ T7914] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.632504][ T7914] ? wbc_attach_and_unlock_inode+0x5c4/0x930 [ 50.638497][ T7914] __filemap_fdatawrite_range+0x26d/0x340 [ 50.644226][ T7914] ? delete_from_page_cache_batch+0x1100/0x1100 [ 50.650496][ T7914] ? fsnotify+0x7e0/0xbc0 [ 50.654871][ T7914] filemap_write_and_wait+0x47/0xd0 [ 50.660084][ T7914] __blkdev_put+0x204/0x810 [ 50.664587][ T7914] ? bd_set_size+0xb0/0xb0 [ 50.669006][ T7914] ? wait_for_completion+0x440/0x440 [ 50.674316][ T7914] blkdev_put+0x98/0x560 [ 50.678560][ T7914] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 50.684802][ T7914] ? blkdev_put+0x560/0x560 [ 50.689297][ T7914] blkdev_close+0x8b/0xb0 [ 50.693613][ T7914] __fput+0x2e5/0x8d0 [ 50.697586][ T7914] ____fput+0x16/0x20 [ 50.701601][ T7914] task_work_run+0x14a/0x1c0 [ 50.706212][ T7914] do_exit+0x90a/0x2fa0 [ 50.710368][ T7914] ? smack_inode_rename+0x2d0/0x2d0 [ 50.715580][ T7914] ? mm_update_next_owner+0x640/0x640 [ 50.720960][ T7914] ? tomoyo_file_ioctl+0x23/0x30 [ 50.725891][ T7914] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.732118][ T7914] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 50.737562][ T7914] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 50.743011][ T7914] do_group_exit+0x135/0x370 [ 50.747589][ T7914] __x64_sys_exit_group+0x44/0x50 [ 50.752605][ T7914] do_syscall_64+0x103/0x610 [ 50.757185][ T7914] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.763066][ T7914] RIP: 0033:0x43edf8 [ 50.766952][ T7914] Code: Bad RIP value. [ 50.771017][ T7914] RSP: 002b:00007ffe53204e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 50.779422][ T7914] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043edf8 [ 50.787648][ T7914] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 50.795651][ T7914] RBP: 00000000004be608 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 50.803624][ T7914] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000001 [ 50.811602][ T7914] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 50.820661][ T7914] Kernel Offset: disabled [ 50.825095][ T7914] Rebooting in 86400 seconds..