[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 62.777081][ T27] audit: type=1800 audit(1561037717.090:25): pid=8785 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.815333][ T27] audit: type=1800 audit(1561037717.090:26): pid=8785 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.844804][ T27] audit: type=1800 audit(1561037717.090:27): pid=8785 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 '10.128.0.40' (ECDSA) to the list of known hosts. syzkaller login: [ 74.550002][ T8950] IPVS: ftp: loaded support on port[0] = 21 [ 74.551538][ T8949] IPVS: ftp: loaded support on port[0] = 21 [ 74.564719][ T8948] IPVS: ftp: loaded support on port[0] = 21 [ 74.567730][ T8951] IPVS: ftp: loaded support on port[0] = 21 [ 74.573262][ T8952] IPVS: ftp: loaded support on port[0] = 21 [ 74.580428][ T8947] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 77.236268][ T9764] ------------[ cut here ]------------ [ 77.245336][ T9764] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 77.267324][ T9764] WARNING: CPU: 0 PID: 9764 at block/blk-core.c:758 generic_make_request_checks+0x1c0c/0x2070 [ 77.277604][ T9764] Kernel panic - not syncing: panic_on_warn set ... [ 77.284213][ T9764] CPU: 0 PID: 9764 Comm: blkid Not tainted 5.2.0-rc5-next-20190619 #18 [ 77.292441][ T9764] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.302483][ T9764] Call Trace: [ 77.305774][ T9764] dump_stack+0x172/0x1f0 [ 77.310105][ T9764] ? generic_make_request_checks+0x1b10/0x2070 [ 77.316242][ T9764] panic+0x2cb/0x744 [ 77.320119][ T9764] ? __warn_printk+0xf3/0xf3 [ 77.324720][ T9764] ? generic_make_request_checks+0x1c0c/0x2070 [ 77.330856][ T9764] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 77.337087][ T9764] ? __warn.cold+0x5/0x4d [ 77.341417][ T9764] ? __warn+0xe8/0x1d0 [ 77.345484][ T9764] ? generic_make_request_checks+0x1c0c/0x2070 [ 77.351631][ T9764] __warn.cold+0x20/0x4d [ 77.355876][ T9764] ? vprintk_emit+0x1ea/0x700 [ 77.360543][ T9764] ? generic_make_request_checks+0x1c0c/0x2070 [ 77.366768][ T9764] report_bug+0x263/0x2b0 [ 77.371087][ T9764] do_error_trap+0x11b/0x200 [ 77.375675][ T9764] do_invalid_op+0x37/0x50 [ 77.380095][ T9764] ? generic_make_request_checks+0x1c0c/0x2070 [ 77.386242][ T9764] invalid_op+0x14/0x20 [ 77.390376][ T9764] RIP: 0010:generic_make_request_checks+0x1c0c/0x2070 [ 77.397114][ T9764] Code: 00 00 44 8b ab bc 04 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 66 76 05 00 48 c7 c7 60 46 c3 87 48 89 c6 44 89 ea e8 82 b2 20 fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 77.416722][ T9764] RSP: 0018:ffff888091e57340 EFLAGS: 00010282 [ 77.422767][ T9764] RAX: 0000000000000000 RBX: ffff8880a37aeb40 RCX: 0000000000000000 [ 77.430732][ T9764] RDX: 0000000000000000 RSI: ffffffff815b0c06 RDI: ffffed10123cae5a [ 77.438730][ T9764] RBP: ffff888091e57440 R08: ffff88809b2f46c0 R09: ffffed1015d060a9 [ 77.446685][ T9764] R10: ffffed1015d060a8 R11: ffff8880ae830547 R12: ffff88808cd49608 [ 77.454636][ T9764] R13: 0000000000000000 R14: 0000000000000001 R15: ffff88808cd49600 [ 77.462602][ T9764] ? vprintk_func+0x86/0x189 [ 77.467184][ T9764] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 77.474120][ T9764] ? __lock_acquire+0x537/0x4af0 [ 77.479078][ T9764] generic_make_request+0x8f/0xb40 [ 77.484175][ T9764] ? bio_associate_blkg_from_css+0x4e5/0x990 [ 77.490146][ T9764] ? blk_queue_enter+0xe90/0xe90 [ 77.495090][ T9764] ? lock_downgrade+0x920/0x920 [ 77.499939][ T9764] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 77.506160][ T9764] submit_bio+0xba/0x480 [ 77.510397][ T9764] ? submit_bio+0xba/0x480 [ 77.514814][ T9764] ? generic_make_request+0xb40/0xb40 [ 77.520169][ T9764] ? bio_reset+0x3b0/0x3b0 [ 77.524580][ T9764] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 77.530282][ T9764] ? guard_bio_eod+0x295/0x6c0 [ 77.535029][ T9764] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 77.540732][ T9764] submit_bh_wbc+0x5f7/0x7f0 [ 77.545316][ T9764] __block_write_full_page+0x76e/0x1020 [ 77.550855][ T9764] ? check_disk_change+0x140/0x140 [ 77.555970][ T9764] block_write_full_page+0x21f/0x270 [ 77.561254][ T9764] ? check_disk_change+0x140/0x140 [ 77.566360][ T9764] blkdev_writepage+0x25/0x30 [ 77.571030][ T9764] __writepage+0x62/0xe0 [ 77.575259][ T9764] write_cache_pages+0x7bf/0x1380 [ 77.580267][ T9764] ? __wb_update_bandwidth+0x670/0x670 [ 77.585719][ T9764] ? clear_page_dirty_for_io+0xdc0/0xdc0 [ 77.591333][ T9764] ? inode_init_owner+0x340/0x340 [ 77.596357][ T9764] ? ktime_get_coarse_real_ts64+0x1ba/0x2b0 [ 77.602249][ T9764] ? current_time+0xd8/0x140 [ 77.606829][ T9764] ? timespec64_trunc+0x180/0x180 [ 77.611865][ T9764] generic_writepages+0xed/0x160 [ 77.616790][ T9764] ? write_cache_pages+0x1380/0x1380 [ 77.622083][ T9764] ? wbc_attach_and_unlock_inode+0x51a/0x930 [ 77.628054][ T9764] ? find_held_lock+0x35/0x130 [ 77.632814][ T9764] ? wbc_attach_and_unlock_inode+0x51a/0x930 [ 77.638772][ T9764] ? blkdev_readpages+0x40/0x40 [ 77.643608][ T9764] blkdev_writepages+0x1e/0x30 [ 77.648367][ T9764] do_writepages+0xfa/0x2a0 [ 77.652855][ T9764] ? page_writeback_cpu_online+0x20/0x20 [ 77.658467][ T9764] ? kasan_check_read+0x11/0x20 [ 77.663314][ T9764] ? do_raw_spin_unlock+0x57/0x270 [ 77.668413][ T9764] ? _raw_spin_unlock+0x2d/0x50 [ 77.673242][ T9764] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 77.679463][ T9764] ? wbc_attach_and_unlock_inode+0x5c4/0x930 [ 77.685426][ T9764] __filemap_fdatawrite_range+0x26d/0x340 [ 77.691125][ T9764] ? delete_from_page_cache_batch+0xf90/0xf90 [ 77.697193][ T9764] ? lock_downgrade+0x920/0x920 [ 77.702049][ T9764] filemap_write_and_wait+0x47/0xd0 [ 77.707243][ T9764] __blkdev_put+0x204/0x810 [ 77.711750][ T9764] ? bd_set_size+0xb0/0xb0 [ 77.716162][ T9764] ? wait_for_completion+0x440/0x440 [ 77.721442][ T9764] blkdev_put+0x98/0x560 [ 77.725671][ T9764] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 77.731892][ T9764] blkdev_close+0x8b/0xb0 [ 77.736211][ T9764] __fput+0x2ff/0x890 [ 77.740192][ T9764] ? blkdev_put+0x560/0x560 [ 77.744701][ T9764] ____fput+0x16/0x20 [ 77.748680][ T9764] task_work_run+0x145/0x1c0 [ 77.753272][ T9764] exit_to_usermode_loop+0x273/0x2c0 [ 77.758544][ T9764] do_syscall_64+0x58e/0x680 [ 77.763124][ T9764] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 77.768997][ T9764] RIP: 0033:0x7f92104a42b0 [ 77.773393][ T9764] Code: 40 75 0b 31 c0 48 83 c4 08 e9 0c ff ff ff 48 8d 3d c5 32 08 00 e8 c0 07 02 00 83 3d 45 a3 2b 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ce 8a 01 00 48 89 04 24 [ 77.792977][ T9764] RSP: 002b:00007fffe33289f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 77.801370][ T9764] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f92104a42b0 [ 77.809323][ T9764] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 77.817275][ T9764] RBP: 0000000000000000 R08: 0000000000000028 R09: 0000000001680000 [ 77.825235][ T9764] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000012d9030 [ 77.833640][ T9764] R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000005 [ 77.842660][ T9764] Kernel Offset: disabled [ 77.847037][ T9764] Rebooting in 86400 seconds..