[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 65.518659][ T26] audit: type=1800 audit(1575792800.319:25): pid=9176 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 65.545716][ T26] audit: type=1800 audit(1575792800.319:26): pid=9176 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 65.605712][ T26] audit: type=1800 audit(1575792800.319:27): pid=9176 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 '10.128.10.44' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 76.058736][ T9344] ------------[ cut here ]------------ [ 76.075962][ T9344] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 76.089910][ T9344] WARNING: CPU: 0 PID: 9344 at block/blk-core.c:800 generic_make_request_checks+0x1c78/0x2190 [ 76.101256][ T9344] Kernel panic - not syncing: panic_on_warn set ... [ 76.108133][ T9344] CPU: 0 PID: 9344 Comm: syz-executor233 Not tainted 5.4.0-syzkaller #0 [ 76.117255][ T9344] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.127581][ T9344] Call Trace: [ 76.131779][ T9344] dump_stack+0x197/0x210 [ 76.136582][ T9344] ? generic_make_request_checks+0x1bb0/0x2190 [ 76.142764][ T9344] panic+0x2e3/0x75c [ 76.146687][ T9344] ? add_taint.cold+0x16/0x16 [ 76.151514][ T9344] ? __kasan_check_write+0x14/0x20 [ 76.156660][ T9344] ? __warn.cold+0x14/0x3e [ 76.161194][ T9344] ? __warn+0xd9/0x1cf [ 76.165293][ T9344] ? generic_make_request_checks+0x1c78/0x2190 [ 76.171611][ T9344] __warn.cold+0x2f/0x3e [ 76.175881][ T9344] ? generic_make_request_checks+0x1c78/0x2190 [ 76.182067][ T9344] report_bug+0x289/0x300 [ 76.186426][ T9344] do_error_trap+0x11b/0x200 [ 76.191139][ T9344] do_invalid_op+0x37/0x50 [ 76.195582][ T9344] ? generic_make_request_checks+0x1c78/0x2190 [ 76.201770][ T9344] invalid_op+0x23/0x30 executing program [ 76.205938][ T9344] RIP: 0010:generic_make_request_checks+0x1c78/0x2190 [ 76.212723][ T9344] Code: 00 00 44 8b ab 5c 05 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 ca 92 05 00 48 c7 c7 00 fd 6d 88 48 89 c6 44 89 ea e8 97 d7 cb fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 76.233622][ T9344] RSP: 0018:ffffc90001ed7710 EFLAGS: 00010286 [ 76.239792][ T9344] RAX: 0000000000000000 RBX: ffff8880a146a000 RCX: 0000000000000000 [ 76.246941][ T4090] kobject: 'nullb0' (000000002702d8e2): kobject_uevent_env executing program [ 76.247772][ T9344] RDX: 0000000000000000 RSI: ffffffff815e88f6 RDI: fffff520003daed4 [ 76.247782][ T9344] RBP: ffffc90001ed7810 R08: ffff88809a2e4140 R09: ffffed1015d06621 [ 76.255803][ T4090] kobject: 'nullb0' (000000002702d8e2): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 76.263197][ T9344] R10: ffffed1015d06620 R11: ffff8880ae833107 R12: ffff88809c023f08 [ 76.263206][ T9344] R13: 0000000000000000 R14: 0000000000000001 R15: ffff88809c023f00 [ 76.263236][ T9344] ? vprintk_func+0x86/0x189 executing program executing program [ 76.263264][ T9344] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 76.263284][ T9344] ? mempool_alloc+0x380/0x380 [ 76.278726][ T4090] kobject: 'nullb0' (000000002702d8e2): kobject_uevent_env [ 76.281972][ T9344] ? mempool_alloc_slab+0x47/0x60 [ 76.281988][ T9344] ? mempool_alloc+0x176/0x380 [ 76.282007][ T9344] generic_make_request+0x8f/0xb00 [ 76.282032][ T9344] ? blk_queue_enter+0xdd0/0xdd0 [ 76.293612][ T4090] kobject: 'nullb0' (000000002702d8e2): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 76.299099][ T9344] ? mempool_destroy+0x40/0x40 [ 76.299118][ T9344] ? lock_downgrade+0x920/0x920 [ 76.299140][ T9344] submit_bio+0x113/0x600 [ 76.299151][ T9344] ? submit_bio+0x113/0x600 [ 76.299165][ T9344] ? generic_make_request+0xb00/0xb00 [ 76.299182][ T9344] ? bvec_alloc+0x2f0/0x2f0 [ 76.299194][ T9344] ? bio_add_page+0x1ac/0x220 [ 76.299219][ T9344] blk_next_bio+0x4a/0x60 [ 76.308851][ T4090] kobject: 'nullb0' (000000002702d8e2): kobject_uevent_env [ 76.311993][ T9344] __blkdev_issue_zero_pages+0x151/0x430 [ 76.312018][ T9344] blkdev_issue_zeroout+0x434/0x4c0 [ 76.312038][ T9344] ? __blkdev_issue_zeroout+0x1a0/0x1a0 [ 76.312076][ T9344] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 76.321741][ T4090] kobject: 'nullb0' (000000002702d8e2): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 76.325045][ T9344] blkdev_ioctl+0x146f/0x1df0 [ 76.325063][ T9344] ? blkpg_ioctl+0xa90/0xa90 [ 76.325080][ T9344] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 76.325116][ T9344] block_ioctl+0xee/0x130 [ 76.339998][ T4090] kobject: 'nullb0' (000000002702d8e2): kobject_uevent_env [ 76.344011][ T9344] ? blkdev_fallocate+0x410/0x410 [ 76.344030][ T9344] do_vfs_ioctl+0x977/0x14e0 [ 76.344049][ T9344] ? compat_ioctl_preallocate+0x220/0x220 [ 76.344062][ T9344] ? __fget+0x37f/0x550 [ 76.344084][ T9344] ? ksys_dup3+0x3e0/0x3e0 [ 76.355970][ T4090] kobject: 'nullb0' (000000002702d8e2): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 76.361566][ T9344] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 76.361588][ T9344] ? tomoyo_file_ioctl+0x23/0x30 [ 76.361606][ T9344] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 76.361621][ T9344] ? security_file_ioctl+0x8d/0xc0 [ 76.361643][ T9344] ksys_ioctl+0xab/0xd0 [ 76.373086][ T4090] kobject: 'nullb0' (000000002702d8e2): kobject_uevent_env [ 76.376890][ T9344] __x64_sys_ioctl+0x73/0xb0 [ 76.376909][ T9344] do_syscall_64+0xfa/0x790 [ 76.376928][ T9344] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.376938][ T9344] RIP: 0033:0x4467b9 [ 76.376952][ T9344] 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 [ 76.376959][ T9344] RSP: 002b:00007f398f552db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 76.376971][ T9344] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 00000000004467b9 [ 76.376978][ T9344] RDX: 0000000020000080 RSI: 000000000000127f RDI: 0000000000000003 [ 76.376984][ T9344] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 76.376991][ T9344] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 76.376998][ T9344] R13: 00007ffcdb301f3f R14: 00007f398f5539c0 R15: 0000000000000000 [ 76.383324][ T9344] Kernel Offset: disabled [ 76.653697][ T9344] Rebooting in 86400 seconds..