[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 59.708423][ T26] audit: type=1800 audit(1574555253.211:25): pid=8758 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 59.728412][ T26] audit: type=1800 audit(1574555253.211:26): pid=8758 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 59.793456][ T26] audit: type=1800 audit(1574555253.211:27): pid=8758 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 '10.128.15.220' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 74.337858][ T8927] ------------[ cut here ]------------ [ 74.343792][ T8927] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 74.360122][ T8927] WARNING: CPU: 1 PID: 8927 at block/blk-core.c:829 generic_make_request_checks+0x1c78/0x2190 [ 74.370420][ T8927] Kernel panic - not syncing: panic_on_warn set ... [ 74.377035][ T8927] CPU: 1 PID: 8927 Comm: syz-executor931 Not tainted 5.4.0-rc8-next-20191122-syzkaller #0 [ 74.386923][ T8927] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.397089][ T8927] Call Trace: [ 74.400389][ T8927] dump_stack+0x197/0x210 [ 74.404732][ T8927] ? generic_make_request_checks+0x1c10/0x2190 [ 74.410887][ T8927] panic+0x2e3/0x75c [ 74.414785][ T8927] ? add_taint.cold+0x16/0x16 [ 74.419477][ T8927] ? __kasan_check_write+0x14/0x20 [ 74.424595][ T8927] ? __warn.cold+0x14/0x35 [ 74.429011][ T8927] ? __warn+0xd9/0x1d0 [ 74.433086][ T8927] ? generic_make_request_checks+0x1c78/0x2190 [ 74.439250][ T8927] __warn.cold+0x2f/0x35 [ 74.443504][ T8927] ? generic_make_request_checks+0x1c78/0x2190 [ 74.449665][ T8927] report_bug+0x289/0x300 [ 74.454003][ T8927] do_error_trap+0x11b/0x200 [ 74.458623][ T8927] do_invalid_op+0x37/0x50 [ 74.463045][ T8927] ? generic_make_request_checks+0x1c78/0x2190 [ 74.469204][ T8927] invalid_op+0x23/0x30 [ 74.473372][ T8927] RIP: 0010:generic_make_request_checks+0x1c78/0x2190 executing program [ 74.480137][ T8927] Code: 00 00 44 8b ab 5c 05 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 aa 91 05 00 48 c7 c7 c0 8f e5 87 48 89 c6 44 89 ea e8 e0 24 11 fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 74.499752][ T8927] RSP: 0018:ffff8880923ff370 EFLAGS: 00010286 [ 74.505911][ T8927] RAX: 0000000000000000 RBX: ffff8880a32ed000 RCX: 0000000000000000 [ 74.513885][ T8927] RDX: 0000000000000000 RSI: ffffffff815d88c6 RDI: ffffed101247fe60 [ 74.522144][ T8927] RBP: ffff8880923ff470 R08: ffff8880919ba300 R09: ffffed1015d26621 [ 74.530120][ T8927] R10: ffffed1015d26620 R11: ffff8880ae933107 R12: ffff88809883d108 executing program executing program [ 74.538098][ T8927] R13: 0000000000000000 R14: 0000000000000001 R15: ffff88809883d100 [ 74.542907][ T4010] kobject: 'nullb0' (000000002590ccc6): kobject_uevent_env [ 74.546108][ T8927] ? vprintk_func+0x86/0x189 [ 74.555768][ T4010] kobject: 'nullb0' (000000002590ccc6): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 74.558370][ T8927] ? __bio_clone_fast+0x43f/0x5a0 [ 74.558390][ T8927] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 74.558408][ T8927] ? ktime_get+0x100/0x2f0 executing program executing program [ 74.573924][ T4010] kobject: 'nullb0' (000000002590ccc6): kobject_uevent_env [ 74.580639][ T8927] ? __bio_clone_fast+0x43f/0x5a0 [ 74.580653][ T8927] ? ktime_get+0x100/0x2f0 [ 74.580669][ T8927] ? lockdep_hardirqs_on+0x421/0x5e0 [ 74.580687][ T8927] generic_make_request+0x8f/0xb00 [ 74.580705][ T8927] ? debug_smp_processor_id+0x33/0x18a [ 74.586806][ T4010] kobject: 'nullb0' (000000002590ccc6): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 74.592289][ T8927] ? blk_queue_enter+0xdd0/0xdd0 [ 74.592317][ T8927] ? rcu_read_lock_sched_held+0x9c/0xd0 executing program executing program executing program [ 74.592332][ T8927] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 74.592355][ T8927] __blk_queue_split+0x4e9/0x1790 [ 74.602210][ T4010] kobject: 'nullb0' (000000002590ccc6): kobject_uevent_env [ 74.607031][ T8927] ? __blk_queue_split+0x4e9/0x1790 [ 74.607055][ T8927] ? blk_rq_map_sg+0x1b10/0x1b10 [ 74.607078][ T8927] blk_mq_make_request+0x17d/0x2280 [ 74.616680][ T4010] kobject: 'nullb0' (000000002590ccc6): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 74.617605][ T8927] ? blk_queue_enter+0xb35/0xdd0 executing program executing program [ 74.634875][ T4010] kobject: 'nullb0' (000000002590ccc6): kobject_uevent_env [ 74.638384][ T8927] ? blk_mq_try_issue_directly+0x1c0/0x1c0 [ 74.638416][ T8927] ? __kasan_check_read+0x11/0x20 [ 74.648864][ T4010] kobject: 'nullb0' (000000002590ccc6): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 74.649415][ T8927] generic_make_request+0x23c/0xb00 [ 74.649432][ T8927] ? blk_queue_enter+0xdd0/0xdd0 [ 74.649458][ T8927] ? lock_downgrade+0x920/0x920 [ 74.660304][ T4010] kobject: 'nullb0' (000000002590ccc6): kobject_uevent_env executing program executing program [ 74.661821][ T8927] submit_bio+0x113/0x600 [ 74.661833][ T8927] ? submit_bio+0x113/0x600 [ 74.661850][ T8927] ? generic_make_request+0xb00/0xb00 [ 74.669561][ T4010] kobject: 'nullb0' (000000002590ccc6): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 74.671957][ T8927] ? bvec_alloc+0x2f0/0x2f0 [ 74.671970][ T8927] ? bio_add_page+0x1ac/0x220 [ 74.671993][ T8927] blk_next_bio+0x4a/0x60 [ 74.672007][ T8927] __blkdev_issue_zero_pages+0x151/0x430 [ 74.672027][ T8927] blkdev_issue_zeroout+0x434/0x4c0 executing program [ 74.689775][ T4010] kobject: 'nullb0' (000000002590ccc6): kobject_uevent_env [ 74.694453][ T8927] ? __blkdev_issue_zeroout+0x1a0/0x1a0 [ 74.694481][ T8927] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 74.694502][ T8927] blkdev_ioctl+0x1451/0x1dc0 [ 74.700629][ T4010] kobject: 'nullb0' (000000002590ccc6): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 74.705311][ T8927] ? blkpg_ioctl+0xa90/0xa90 [ 74.705330][ T8927] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 74.705362][ T8927] block_ioctl+0xee/0x130 [ 74.722489][ T4010] kobject: 'nullb0' (000000002590ccc6): kobject_uevent_env [ 74.725796][ T8927] ? blkdev_fallocate+0x410/0x410 [ 74.725813][ T8927] do_vfs_ioctl+0x977/0x14e0 [ 74.725832][ T8927] ? compat_ioctl_preallocate+0x220/0x220 [ 74.733260][ T4010] kobject: 'nullb0' (000000002590ccc6): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 74.737858][ T8927] ? __fget+0x37f/0x550 [ 74.737880][ T8927] ? ksys_dup3+0x3e0/0x3e0 [ 74.737895][ T8927] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 74.737915][ T8927] ? tomoyo_file_ioctl+0x23/0x30 [ 74.747646][ T4010] kobject: 'nullb0' (000000002590ccc6): kobject_uevent_env [ 74.752087][ T8927] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 74.752104][ T8927] ? security_file_ioctl+0x8d/0xc0 [ 74.752119][ T8927] ksys_ioctl+0xab/0xd0 [ 74.752137][ T8927] __x64_sys_ioctl+0x73/0xb0 [ 74.766838][ T4010] kobject: 'nullb0' (000000002590ccc6): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 74.766961][ T8927] do_syscall_64+0xfa/0x790 [ 74.773786][ T4010] kobject: 'nullb0' (000000002590ccc6): kobject_uevent_env [ 74.775940][ T8927] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 74.775952][ T8927] RIP: 0033:0x446799 [ 74.775969][ T8927] 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 [ 74.785119][ T4010] kobject: 'nullb0' (000000002590ccc6): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 74.786767][ T8927] RSP: 002b:00007f4ca4e0cdb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 74.786782][ T8927] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446799 [ 74.786791][ T8927] RDX: 0000000020000080 RSI: 000000000000127f RDI: 0000000000000003 [ 74.786798][ T8927] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 74.786811][ T8927] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 74.800740][ T4010] kobject: 'nullb0' (000000002590ccc6): kobject_uevent_env [ 74.805958][ T8927] R13: 00007ffe0211433f R14: 00007f4ca4e0d9c0 R15: 000000000000002d [ 74.812142][ T8927] Kernel Offset: disabled [ 75.039280][ T8927] Rebooting in 86400 seconds..