[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 61.930330][ T25] audit: type=1800 audit(1575233492.009:25): pid=9083 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 61.951089][ T25] audit: type=1800 audit(1575233492.009:26): pid=9083 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 61.972311][ T25] audit: type=1800 audit(1575233492.009:27): pid=9083 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 '10.128.0.109' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 73.050732][ T9235] ------------[ cut here ]------------ [ 73.056382][ T9235] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 73.056770][ T9235] WARNING: CPU: 0 PID: 9235 at block/blk-core.c:800 generic_make_request_checks+0x1c78/0x2190 [ 73.066043][ T4086] kobject: 'nullb0' (00000000159da955): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 73.076105][ T9235] Kernel panic - not syncing: panic_on_warn set ... [ 73.076121][ T9235] CPU: 0 PID: 9235 Comm: syz-executor365 Not tainted 5.4.0-syzkaller #0 [ 73.076128][ T9235] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.076133][ T9235] Call Trace: [ 73.076165][ T9235] dump_stack+0x197/0x210 [ 73.076183][ T9235] ? generic_make_request_checks+0x1c30/0x2190 [ 73.076196][ T9235] panic+0x2e3/0x75c [ 73.076208][ T9235] ? add_taint.cold+0x16/0x16 [ 73.076224][ T9235] ? __kasan_check_write+0x14/0x20 [ 73.076236][ T9235] ? __warn.cold+0x14/0x3e [ 73.076246][ T9235] ? __warn+0xd9/0x1cf [ 73.076261][ T9235] ? generic_make_request_checks+0x1c78/0x2190 [ 73.076273][ T9235] __warn.cold+0x2f/0x3e [ 73.076287][ T9235] ? generic_make_request_checks+0x1c78/0x2190 [ 73.076305][ T9235] report_bug+0x289/0x300 [ 73.076323][ T9235] do_error_trap+0x11b/0x200 [ 73.076338][ T9235] do_invalid_op+0x37/0x50 [ 73.076350][ T9235] ? generic_make_request_checks+0x1c78/0x2190 [ 73.076367][ T9235] invalid_op+0x23/0x30 [ 73.076386][ T9235] RIP: 0010:generic_make_request_checks+0x1c78/0x2190 [ 73.194341][ T9235] Code: 00 00 44 8b ab 5c 05 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 4a 95 05 00 48 c7 c7 80 cb 4d 88 48 89 c6 44 89 ea e8 57 33 cc fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 73.213922][ T9235] RSP: 0018:ffff888095dc71c0 EFLAGS: 00010286 [ 73.219963][ T9235] RAX: 0000000000000000 RBX: ffff8880a2adc000 RCX: 0000000000000000 [ 73.227918][ T9235] RDX: 0000000000000000 RSI: ffffffff815e4336 RDI: ffffed1012bb8e2a [ 73.235864][ T9235] RBP: ffff888095dc72c0 R08: ffff88809659c2c0 R09: ffffed1015d045c9 [ 73.243810][ T9235] R10: ffffed1015d045c8 R11: ffff8880ae822e47 R12: ffff8880a0a33b08 [ 73.251778][ T9235] R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a0a33b00 [ 73.259752][ T9235] ? vprintk_func+0x86/0x189 [ 73.264336][ T9235] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 73.271253][ T9235] ? __kasan_check_read+0x11/0x20 [ 73.276256][ T9235] ? __lock_acquire+0x8a0/0x4a00 [ 73.281169][ T9235] ? __kasan_check_read+0x11/0x20 [ 73.286177][ T9235] generic_make_request+0x8f/0xb50 [ 73.291339][ T9235] ? blk_queue_enter+0xe30/0xe30 [ 73.296253][ T9235] ? lock_downgrade+0x920/0x920 [ 73.301079][ T9235] submit_bio+0x113/0x600 [ 73.305433][ T9235] ? submit_bio+0x113/0x600 [ 73.309915][ T9235] ? generic_make_request+0xb50/0xb50 [ 73.315265][ T9235] ? bio_associate_blkg_from_css+0x4fd/0x980 [ 73.321220][ T9235] ? bio_reset+0x3a0/0x3a0 [ 73.325614][ T9235] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 73.331307][ T9235] ? guard_bio_eod+0x28f/0x6c0 [ 73.336045][ T9235] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 73.341740][ T9235] submit_bh_wbc+0x6b6/0x900 [ 73.346311][ T9235] __block_write_full_page+0x7fe/0x11b0 [ 73.351831][ T9235] ? bdev_evict_inode+0x5c0/0x5c0 [ 73.356829][ T9235] ? try_to_free_buffers+0x7e0/0x7e0 [ 73.362105][ T9235] block_write_full_page+0x21f/0x270 [ 73.367362][ T9235] ? bdev_evict_inode+0x5c0/0x5c0 [ 73.372360][ T9235] blkdev_writepage+0x25/0x30 [ 73.377027][ T9235] __writepage+0x66/0x110 [ 73.381333][ T9235] write_cache_pages+0x80c/0x13f0 [ 73.386334][ T9235] ? tag_pages_for_writeback+0x4b0/0x4b0 [ 73.391945][ T9235] ? clear_page_dirty_for_io+0xde0/0xde0 [ 73.397551][ T9235] ? lock_downgrade+0x920/0x920 [ 73.402383][ T9235] ? ep_poll_callback+0x730/0xe60 [ 73.407387][ T9235] ? __kasan_check_read+0x11/0x20 [ 73.412386][ T9235] ? mark_lock+0xc2/0x1220 [ 73.416783][ T9235] generic_writepages+0xed/0x160 [ 73.421696][ T9235] ? write_cache_pages+0x13f0/0x13f0 [ 73.426961][ T9235] ? wbc_attach_and_unlock_inode+0x515/0xa00 [ 73.432914][ T9235] ? find_held_lock+0x35/0x130 [ 73.437653][ T9235] ? blkdev_readpages+0x40/0x40 [ 73.442475][ T9235] blkdev_writepages+0x1e/0x30 [ 73.447225][ T9235] do_writepages+0xfa/0x2a0 [ 73.451706][ T9235] ? page_writeback_cpu_online+0x20/0x20 [ 73.457314][ T9235] ? do_raw_spin_unlock+0x178/0x270 [ 73.462507][ T9235] ? _raw_spin_unlock+0x28/0x40 [ 73.467334][ T9235] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 73.473550][ T9235] ? wbc_attach_and_unlock_inode+0x637/0xa00 [ 73.479510][ T9235] __filemap_fdatawrite_range+0x2bc/0x3b0 [ 73.485215][ T9235] ? delete_from_page_cache_batch+0xfe0/0xfe0 [ 73.491275][ T9235] ? lock_downgrade+0x920/0x920 [ 73.496130][ T9235] filemap_write_and_wait+0xf8/0x1e0 [ 73.501390][ T9235] __blkdev_put+0x204/0x810 [ 73.505916][ T9235] ? bd_set_size+0xb0/0xb0 [ 73.510336][ T9235] ? wait_for_completion+0x440/0x440 [ 73.515613][ T9235] blkdev_put+0x98/0x560 [ 73.519842][ T9235] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 73.526069][ T9235] blkdev_close+0x8b/0xb0 [ 73.530383][ T9235] __fput+0x2ff/0x890 [ 73.534347][ T9235] ? blkdev_put+0x560/0x560 [ 73.538828][ T9235] ____fput+0x16/0x20 [ 73.542789][ T9235] task_work_run+0x145/0x1c0 [ 73.547364][ T9235] do_exit+0x8e7/0x2ef0 [ 73.551501][ T9235] ? mm_update_next_owner+0x7c0/0x7c0 [ 73.556861][ T9235] ? tomoyo_file_ioctl+0x23/0x30 [ 73.561812][ T9235] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.568029][ T9235] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 73.573488][ T9235] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 73.578933][ T9235] do_group_exit+0x135/0x360 [ 73.583523][ T9235] __x64_sys_exit_group+0x44/0x50 [ 73.588530][ T9235] do_syscall_64+0xfa/0x790 [ 73.593051][ T9235] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 73.598944][ T9235] RIP: 0033:0x43edf8 [ 73.602829][ T9235] Code: Bad RIP value. [ 73.606873][ T9235] RSP: 002b:00007ffd381cbde8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 73.615267][ T9235] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043edf8 [ 73.623225][ T9235] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 73.631307][ T9235] RBP: 00000000004be608 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 73.639279][ T9235] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000001 [ 73.647283][ T9235] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 73.656803][ T9235] Kernel Offset: disabled [ 73.661211][ T9235] Rebooting in 86400 seconds..