[ 38.824605] audit: type=1800 audit(1575695377.741:32): pid=7510 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 res=0 Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.672586] audit: type=1800 audit(1575695378.661:33): pid=7510 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=2465 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.88' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 48.136038] kauditd_printk_skb: 2 callbacks suppressed [ 48.136052] audit: type=1400 audit(1575695387.121:36): avc: denied { map } for pid=7693 comm="syz-executor107" path="/root/syz-executor107682441" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program [ 48.204067] ------------[ cut here ]------------ [ 48.217555] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) executing program executing program [ 48.260927] WARNING: CPU: 0 PID: 7704 at block/blk-core.c:2180 generic_make_request_checks+0x1fc5/0x24c0 [ 48.270594] Kernel panic - not syncing: panic_on_warn set ... [ 48.270594] [ 48.277984] CPU: 0 PID: 7704 Comm: syz-executor107 Not tainted 4.19.88-syzkaller #0 [ 48.285790] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.295178] Call Trace: [ 48.296566] kobject: 'nullb0' (00000000130d9cd6): kobject_uevent_env [ 48.297775] dump_stack+0x197/0x210 [ 48.297798] panic+0x26a/0x50e executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 48.307451] kobject: 'nullb0' (00000000130d9cd6): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 48.307961] ? __warn_printk+0xf3/0xf3 [ 48.307981] ? generic_make_request_checks+0x1fc5/0x24c0 [ 48.330108] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.335662] ? __warn.cold+0x5/0x53 [ 48.339308] ? __warn+0xe8/0x1d0 [ 48.342697] ? generic_make_request_checks+0x1fc5/0x24c0 [ 48.348161] __warn.cold+0x20/0x53 [ 48.351844] ? generic_make_request_checks+0x1fc5/0x24c0 [ 48.357325] report_bug+0x263/0x2b0 executing program executing program executing program executing program executing program executing program executing program executing program [ 48.360985] do_error_trap+0x204/0x360 [ 48.364892] ? math_error+0x340/0x340 [ 48.368702] ? wake_up_klogd+0x99/0xd0 [ 48.372605] ? vprintk_emit+0x2a8/0x6d0 [ 48.376592] ? vprintk_emit+0x1ce/0x6d0 [ 48.380586] ? error_entry+0x7c/0xe0 [ 48.384316] ? trace_hardirqs_off_caller+0x65/0x220 [ 48.389338] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.394194] do_invalid_op+0x1b/0x20 [ 48.397922] invalid_op+0x14/0x20 [ 48.401392] RIP: 0010:generic_make_request_checks+0x1fc5/0x24c0 executing program executing program executing program executing program [ 48.407461] Code: 85 1f 04 00 00 45 8b b6 e4 04 00 00 48 8d 73 a0 4c 89 e7 e8 fd 67 06 00 48 c7 c7 60 90 e8 87 48 89 c6 44 89 f2 e8 49 3c f2 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 48.426586] RSP: 0018:ffff88808ef073a8 EFLAGS: 00010286 [ 48.431964] RAX: 0000000000000000 RBX: ffff88808ef07478 RCX: 0000000000000000 [ 48.439254] RDX: 0000000000000000 RSI: ffffffff81558b96 RDI: ffffed1011de0e67 [ 48.446559] RBP: ffff88808ef074a0 R08: ffff88808ec9e180 R09: ffffed1015d05079 [ 48.453849] R10: ffffed1015d05078 R11: ffff8880ae8283c7 R12: ffff888091fcb080 executing program executing program [ 48.461136] R13: ffff888091fcb088 R14: 0000000000000000 R15: 0000000000000000 [ 48.468439] ? vprintk_func+0x86/0x189 [ 48.472353] ? generic_make_request_checks+0x1fc5/0x24c0 [ 48.475212] kobject: 'nullb0' (00000000130d9cd6): kobject_uevent_env [ 48.477829] ? trace_event_raw_event_block_rq_requeue+0x630/0x630 [ 48.484651] kobject: 'nullb0' (00000000130d9cd6): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 48.490531] ? lock_downgrade+0x880/0x880 [ 48.490551] ? kasan_check_read+0x11/0x20 executing program executing program [ 48.490573] generic_make_request+0x24c/0x12d0 [ 48.513047] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.518605] ? bio_clone_blkcg_association+0xea/0x330 [ 48.523825] ? blk_get_request+0x710/0x710 [ 48.528091] ? check_preemption_disabled+0x48/0x290 [ 48.533136] blk_queue_split+0x8fa/0x1bd0 [ 48.537308] ? blk_queue_split+0x8fa/0x1bd0 [ 48.541660] ? blk_execute_rq_nowait.cold+0x3c/0x3c [ 48.546025] kobject: 'nullb0' (00000000130d9cd6): kobject_uevent_env [ 48.546695] blk_mq_make_request+0x15e/0x1de0 executing program executing program [ 48.553494] kobject: 'nullb0' (00000000130d9cd6): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 48.557663] ? blk_mq_try_issue_directly+0x1b0/0x1b0 [ 48.557686] ? trace_event_raw_event_block_rq_requeue+0x630/0x630 [ 48.557703] ? mempool_alloc+0x176/0x380 [ 48.582715] generic_make_request+0x747/0x12d0 [ 48.587324] ? blk_get_request+0x710/0x710 [ 48.591576] ? lockdep_hardirqs_on+0x415/0x5d0 [ 48.596183] submit_bio+0xba/0x480 [ 48.599742] ? submit_bio+0xba/0x480 [ 48.602721] kobject: 'nullb0' (00000000130d9cd6): kobject_uevent_env executing program executing program executing program [ 48.603478] ? generic_make_request+0x12d0/0x12d0 [ 48.609970] kobject: 'nullb0' (00000000130d9cd6): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 48.614779] ? bvec_alloc+0x2f0/0x2f0 [ 48.614805] next_bio+0x4a/0x60 [ 48.614820] __blkdev_issue_zero_pages+0x151/0x430 [ 48.614839] blkdev_issue_zeroout+0x42c/0x4c0 [ 48.614857] ? __blkdev_issue_zeroout+0x1a0/0x1a0 [ 48.645865] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 48.651425] blkdev_ioctl+0x113b/0x1ab6 [ 48.655419] ? blkpg_ioctl+0xa90/0xa90 executing program executing program executing program executing program executing program executing program [ 48.660364] ? do_futex+0x17d/0x1d70 [ 48.664093] ? debug_check_no_obj_freed+0x200/0x464 [ 48.669129] ? __fget+0x340/0x540 [ 48.669878] kobject: 'nullb0' (00000000130d9cd6): kobject_uevent_env [ 48.672590] block_ioctl+0xee/0x130 [ 48.672603] ? blkdev_fallocate+0x410/0x410 [ 48.672617] do_vfs_ioctl+0xd5f/0x1380 [ 48.672631] ? selinux_file_ioctl+0x46f/0x5e0 [ 48.672645] ? selinux_file_ioctl+0x125/0x5e0 [ 48.679378] kobject: 'nullb0' (00000000130d9cd6): fill_kobj_path: path = '/devices/virtual/block/nullb0' executing program executing program [ 48.682736] ? ioctl_preallocate+0x210/0x210 [ 48.682751] ? selinux_file_mprotect+0x620/0x620 [ 48.682771] ? iterate_fd+0x360/0x360 [ 48.682798] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.682810] ? security_file_ioctl+0x8d/0xc0 [ 48.682825] ksys_ioctl+0xab/0xd0 [ 48.682841] __x64_sys_ioctl+0x73/0xb0 [ 48.739891] do_syscall_64+0xfd/0x620 [ 48.743736] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.747994] kobject: 'nullb0' (00000000130d9cd6): kobject_uevent_env [ 48.748936] RIP: 0033:0x446799 executing program executing program executing program [ 48.755766] kobject: 'nullb0' (00000000130d9cd6): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 48.758600] 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 [ 48.758608] RSP: 002b:00007f201d640db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 48.758622] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446799 [ 48.758630] RDX: 0000000020000080 RSI: 000000000000127f RDI: 0000000000000003 [ 48.758637] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 48.758648] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 48.809910] kobject: 'nullb0' (00000000130d9cd6): kobject_uevent_env [ 48.816663] R13: 00007ffd99e3edaf R14: 00007f201d6419c0 R15: 000000000000002d [ 48.825258] Kernel Offset: disabled [ 48.842644] Rebooting in 86400 seconds..