[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 74.425060][ T27] audit: type=1800 audit(1576903907.815:25): pid=9145 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 74.444873][ T27] audit: type=1800 audit(1576903907.815:26): pid=9145 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 74.470743][ T27] audit: type=1800 audit(1576903907.825:27): pid=9145 uid=0 auid=4294967295 ses=4294967295 subj==unconfined 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 '10.128.0.139' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 82.623797][ T9314] ------------[ cut here ]------------ [ 82.650735][ T9314] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 82.661099][ T9314] WARNING: CPU: 0 PID: 9314 at block/blk-core.c:829 generic_make_request_checks+0x1c78/0x2190 [ 82.671357][ T9314] Kernel panic - not syncing: panic_on_warn set ... [ 82.677950][ T9314] CPU: 0 PID: 9314 Comm: syz-executor764 Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 [ 82.687837][ T9314] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.697895][ T9314] Call Trace: [ 82.701192][ T9314] dump_stack+0x197/0x210 [ 82.705532][ T9314] ? generic_make_request_checks+0x1c00/0x2190 [ 82.711698][ T9314] panic+0x2e3/0x75c [ 82.715602][ T9314] ? add_taint.cold+0x16/0x16 [ 82.720293][ T9314] ? __kasan_check_write+0x14/0x20 [ 82.725492][ T9314] ? __warn.cold+0x14/0x3e [ 82.729915][ T9314] ? __warn+0xd9/0x1cf [ 82.734076][ T9314] ? generic_make_request_checks+0x1c78/0x2190 [ 82.740232][ T9314] __warn.cold+0x2f/0x3e [ 82.744492][ T9314] ? generic_make_request_checks+0x1c78/0x2190 [ 82.750649][ T9314] report_bug+0x289/0x300 [ 82.755014][ T9314] do_error_trap+0x11b/0x200 [ 82.759613][ T9314] do_invalid_op+0x37/0x50 [ 82.764384][ T9314] ? generic_make_request_checks+0x1c78/0x2190 [ 82.770573][ T9314] invalid_op+0x23/0x30 [ 82.774734][ T9314] RIP: 0010:generic_make_request_checks+0x1c78/0x2190 [ 82.781513][ T9314] Code: 00 00 44 8b ab 5c 05 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 ca 9e 05 00 48 c7 c7 80 37 6e 88 48 89 c6 44 89 ea e8 47 a7 c9 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 82.801147][ T9314] RSP: 0018:ffffc90001f57490 EFLAGS: 00010282 [ 82.807214][ T9314] RAX: 0000000000000000 RBX: ffff8880a1ba8000 RCX: 0000000000000000 [ 82.815245][ T9314] RDX: 0000000000000000 RSI: ffffffff815e9f66 RDI: fffff520003eae84 [ 82.823206][ T9314] RBP: ffffc90001f57590 R08: ffff88809ab08540 R09: 0000000000000000 [ 82.831169][ T9314] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a2030108 [ 82.839513][ T9314] R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a2030100 [ 82.847524][ T9314] ? vprintk_func+0x86/0x189 [ 82.852107][ T9314] ? __bio_clone_fast+0x43f/0x5a0 [ 82.857115][ T9314] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 82.864036][ T9314] ? ktime_get+0x100/0x2f0 [ 82.868444][ T9314] ? __bio_clone_fast+0x43f/0x5a0 [ 82.873458][ T9314] ? ktime_get+0x100/0x2f0 [ 82.877863][ T9314] ? lockdep_hardirqs_on+0x421/0x5e0 [ 82.883144][ T9314] ? trace_hardirqs_on+0x67/0x240 [ 82.888169][ T9314] generic_make_request+0x8f/0xb00 [ 82.893270][ T9314] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 82.899501][ T9314] ? debug_smp_processor_id+0x33/0x18a [ 82.904952][ T9314] ? blk_queue_enter+0xe10/0xe10 [ 82.909869][ T9314] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 82.915393][ T9314] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 82.921359][ T9314] __blk_queue_split+0x908/0x17a0 [ 82.926367][ T9314] ? __blk_queue_split+0x908/0x17a0 [ 82.931548][ T9314] ? blk_rq_map_sg+0x1ab0/0x1ab0 [ 82.936461][ T9314] ? lock_downgrade+0x920/0x920 [ 82.941306][ T9314] blk_mq_make_request+0x17d/0x2280 [ 82.946665][ T9314] ? blk_queue_enter+0xb78/0xe10 [ 82.951781][ T9314] ? blk_mq_try_issue_directly+0x1c0/0x1c0 [ 82.957599][ T9314] ? __kasan_check_read+0x11/0x20 [ 82.962613][ T9314] generic_make_request+0x23c/0xb00 [ 82.967799][ T9314] ? blk_queue_enter+0xe10/0xe10 [ 82.972750][ T9314] submit_bio+0x113/0x600 [ 82.977085][ T9314] ? submit_bio+0x113/0x600 [ 82.981577][ T9314] ? generic_make_request+0xb00/0xb00 [ 82.986948][ T9314] ? bvec_alloc+0x2f0/0x2f0 [ 82.991443][ T9314] ? bio_add_page+0x1ac/0x220 [ 82.996135][ T9314] blk_next_bio+0x4a/0x60 [ 83.000452][ T9314] __blkdev_issue_zero_pages+0x151/0x430 [ 83.006085][ T9314] blkdev_issue_zeroout+0x434/0x4c0 [ 83.011268][ T9314] ? __blkdev_issue_zeroout+0x1a0/0x1a0 [ 83.016803][ T9314] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 83.023033][ T9314] ? _copy_from_user+0x12c/0x1a0 [ 83.027949][ T9314] blkdev_common_ioctl+0x59e/0x1810 [ 83.033133][ T9314] ? blk_ioctl_discard+0x370/0x370 [ 83.038223][ T9314] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 83.044098][ T9314] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 83.050325][ T9314] ? do_vfs_ioctl+0x11b/0x1340 [ 83.055070][ T9314] ? __fget+0x37f/0x550 [ 83.059206][ T9314] blkdev_ioctl+0x1aa/0x670 [ 83.063689][ T9314] ? blkdev_common_ioctl+0x1810/0x1810 [ 83.069136][ T9314] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 83.074664][ T9314] block_ioctl+0xee/0x130 [ 83.078994][ T9314] ? blkdev_fallocate+0x410/0x410 [ 83.084022][ T9314] ksys_ioctl+0x123/0x180 [ 83.088367][ T9314] __x64_sys_ioctl+0x73/0xb0 [ 83.092949][ T9314] do_syscall_64+0xfa/0x790 [ 83.097455][ T9314] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 83.103327][ T9314] RIP: 0033:0x4467b9 [ 83.107222][ T9314] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 83.126810][ T9314] RSP: 002b:00007f9deef08db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 83.135201][ T9314] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 00000000004467b9 [ 83.143151][ T9314] RDX: 0000000020000080 RSI: 000000000000127f RDI: 0000000000000003 [ 83.151101][ T9314] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 83.159073][ T9314] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 83.167023][ T9314] R13: 00007ffcf82a8fbf R14: 00007f9deef099c0 R15: 0000000000000000 [ 83.176468][ T9314] Kernel Offset: disabled [ 83.180849][ T9314] Rebooting in 86400 seconds..