[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 68.978529][ T26] kauditd_printk_skb: 5 callbacks suppressed [ 68.978539][ T26] audit: type=1800 audit(1573223026.843:39): pid=9186 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 69.019121][ T26] audit: type=1800 audit(1573223026.843:40): pid=9186 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 [ 69.834290][ T26] audit: type=1400 audit(1573223027.693:41): avc: denied { map } for pid=9364 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.230' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 408.003809][ T26] audit: type=1400 audit(1573223365.863:42): avc: denied { map } for pid=9376 comm="syz-executor279" path="/root/syz-executor279145861" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 408.070412][ T9386] ------------[ cut here ]------------ [ 408.076737][ T9386] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 408.090518][ T9386] WARNING: CPU: 1 PID: 9386 at block/blk-core.c:797 generic_make_request_checks+0x1d5c/0x2210 [ 408.100770][ T9386] Kernel panic - not syncing: panic_on_warn set ... [ 408.102178][ T3901] kobject: 'nullb0' (000000004663d9d2): kobject_uevent_env [ 408.107364][ T9386] CPU: 1 PID: 9386 Comm: syz-executor279 Not tainted 5.4.0-rc6+ #0 [ 408.107373][ T9386] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 408.107379][ T9386] Call Trace: [ 408.107452][ T9386] dump_stack+0x197/0x210 [ 408.107475][ T9386] ? generic_make_request_checks+0x1ce0/0x2210 [ 408.146481][ T9386] panic+0x2e3/0x75c [ 408.150379][ T9386] ? add_taint.cold+0x16/0x16 [ 408.155062][ T9386] ? __kasan_check_write+0x14/0x20 [ 408.160174][ T9386] ? __warn.cold+0x14/0x35 [ 408.164585][ T9386] ? __warn+0xd9/0x1d0 [ 408.166375][ T3901] kobject: 'nullb0' (000000004663d9d2): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 408.168666][ T9386] ? generic_make_request_checks+0x1d5c/0x2210 [ 408.168681][ T9386] __warn.cold+0x2f/0x35 [ 408.168697][ T9386] ? generic_make_request_checks+0x1d5c/0x2210 [ 408.168714][ T9386] report_bug+0x289/0x300 [ 408.168738][ T9386] do_error_trap+0x11b/0x200 [ 408.168754][ T9386] do_invalid_op+0x37/0x50 [ 408.208845][ T9386] ? generic_make_request_checks+0x1d5c/0x2210 [ 408.215080][ T9386] invalid_op+0x23/0x30 [ 408.219244][ T9386] RIP: 0010:generic_make_request_checks+0x1d5c/0x2210 [ 408.226007][ T9386] Code: 00 00 44 8b ab 3c 05 00 00 48 8d b5 78 ff ff ff 4c 89 f7 e8 c6 87 05 00 48 c7 c7 60 0e e5 87 48 89 c6 44 89 ea e8 5c 0b 14 fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 408.245613][ T9386] RSP: 0018:ffff8880a863f370 EFLAGS: 00010286 [ 408.251683][ T9386] RAX: 0000000000000000 RBX: ffff8880a3301000 RCX: 0000000000000000 [ 408.259664][ T9386] RDX: 0000000000000000 RSI: ffffffff815cc5a6 RDI: ffffed10150c7e60 [ 408.267640][ T9386] RBP: ffff8880a863f470 R08: ffff8880a0ec26c0 R09: ffffed1015d26159 [ 408.275615][ T9386] R10: ffffed1015d26158 R11: ffff8880ae930ac7 R12: ffff88809c53f448 [ 408.283594][ T9386] R13: 0000000000000000 R14: ffff88809c53f440 R15: ffff8880a33b2ef8 [ 408.291714][ T9386] ? vprintk_func+0x86/0x189 [ 408.296319][ T9386] ? __bio_clone_fast+0x445/0x5a0 [ 408.299444][ T3901] kobject: 'nullb0' (000000004663d9d2): kobject_uevent_env [ 408.301359][ T9386] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 408.308819][ T3901] kobject: 'nullb0' (000000004663d9d2): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 408.315461][ T9386] ? ktime_get+0x105/0x300 [ 408.315478][ T9386] ? __bio_clone_fast+0x445/0x5a0 [ 408.315491][ T9386] ? ktime_get+0x105/0x300 [ 408.315504][ T9386] ? lockdep_hardirqs_on+0x421/0x5e0 [ 408.315523][ T9386] generic_make_request+0x8f/0xb50 [ 408.349995][ T9386] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 408.356247][ T9386] ? blk_queue_enter+0xe50/0xe50 [ 408.361202][ T9386] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 408.366757][ T9386] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 408.372744][ T9386] __blk_queue_split+0xb55/0x1560 [ 408.377770][ T9386] ? __blk_queue_split+0xb55/0x1560 [ 408.380346][ T3901] kobject: 'nullb0' (000000004663d9d2): kobject_uevent_env [ 408.382970][ T9386] ? blk_rq_map_sg+0x1b10/0x1b10 [ 408.393446][ T3901] kobject: 'nullb0' (000000004663d9d2): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 408.395067][ T9386] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 408.395091][ T9386] blk_mq_make_request+0x17d/0x2280 [ 408.395109][ T9386] ? blk_queue_enter+0xbb3/0xe50 [ 408.421743][ T9386] ? blk_mq_try_issue_directly+0x1c0/0x1c0 [ 408.427582][ T9386] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 408.433826][ T9386] ? __kasan_check_read+0x11/0x20 [ 408.438870][ T9386] generic_make_request+0x23c/0xb50 [ 408.444080][ T9386] ? blk_queue_enter+0xe50/0xe50 [ 408.449036][ T9386] ? lock_downgrade+0x920/0x920 [ 408.453915][ T9386] submit_bio+0x113/0x600 [ 408.458276][ T9386] ? submit_bio+0x113/0x600 [ 408.462786][ T9386] ? generic_make_request+0xb50/0xb50 [ 408.468167][ T9386] ? bvec_alloc+0x2f0/0x2f0 [ 408.469643][ T3901] kobject: 'nullb0' (000000004663d9d2): kobject_uevent_env [ 408.472671][ T9386] ? bio_add_page+0x1ac/0x220 [ 408.480231][ T3901] kobject: 'nullb0' (000000004663d9d2): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 408.484523][ T9386] blk_next_bio+0x4a/0x60 [ 408.484539][ T9386] __blkdev_issue_zero_pages+0x151/0x430 [ 408.484562][ T9386] blkdev_issue_zeroout+0x434/0x4c0 [ 408.484579][ T9386] ? __blkdev_issue_zeroout+0x1a0/0x1a0 [ 408.515537][ T9386] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 408.521795][ T9386] blkdev_ioctl+0x13d4/0x1c20 [ 408.526480][ T9386] ? blkpg_ioctl+0xa90/0xa90 [ 408.531077][ T9386] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 408.536898][ T9386] ? ___might_sleep+0x163/0x2c0 [ 408.541757][ T9386] block_ioctl+0xee/0x130 [ 408.546092][ T9386] ? blkdev_fallocate+0x410/0x410 [ 408.549347][ T3901] kobject: 'nullb0' (000000004663d9d2): kobject_uevent_env [ 408.551146][ T9386] do_vfs_ioctl+0xdb6/0x13e0 [ 408.559232][ T3901] kobject: 'nullb0' (000000004663d9d2): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 408.562906][ T9386] ? ioctl_preallocate+0x210/0x210 [ 408.562923][ T9386] ? selinux_file_mprotect+0x620/0x620 [ 408.562934][ T9386] ? __fget+0x384/0x560 [ 408.562953][ T9386] ? ksys_dup3+0x3e0/0x3e0 [ 408.592321][ T9386] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 408.597870][ T9386] ? tomoyo_file_ioctl+0x23/0x30 [ 408.602815][ T9386] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 408.609061][ T9386] ? security_file_ioctl+0x8d/0xc0 [ 408.614177][ T9386] ksys_ioctl+0xab/0xd0 [ 408.618341][ T9386] __x64_sys_ioctl+0x73/0xb0 [ 408.622935][ T9386] do_syscall_64+0xfa/0x760 [ 408.627458][ T9386] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 408.633343][ T9386] RIP: 0033:0x446799 [ 408.636619][ T3901] kobject: 'nullb0' (000000004663d9d2): kobject_uevent_env [ 408.637237][ T9386] 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 [ 408.644434][ T3901] kobject: 'nullb0' (000000004663d9d2): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 408.663990][ T9386] RSP: 002b:00007f7741a7adb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 408.664003][ T9386] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446799 [ 408.664009][ T9386] RDX: 0000000020000080 RSI: 000000000000127f RDI: 0000000000000003 [ 408.664016][ T9386] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 408.664023][ T9386] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 408.664029][ T9386] R13: 00007fffb63da31f R14: 00007f7741a7b9c0 R15: 000000000000002d [ 408.675599][ T9386] Kernel Offset: disabled [ 408.727991][ T9386] Rebooting in 86400 seconds..