[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 72.843743][ T27] audit: type=1800 audit(1576411800.511:25): pid=9104 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 72.866061][ T27] audit: type=1800 audit(1576411800.511:26): pid=9104 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 72.886738][ T27] audit: type=1800 audit(1576411800.521:27): pid=9104 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 '10.128.1.25' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 84.540993][ T9260] ------------[ cut here ]------------ [ 84.547603][ T9260] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 84.560012][ T9260] WARNING: CPU: 1 PID: 9260 at block/blk-core.c:829 generic_make_request_checks+0x1c78/0x2190 [ 84.571803][ T9260] Kernel panic - not syncing: panic_on_warn set ... [ 84.580077][ T9260] CPU: 1 PID: 9260 Comm: syz-executor183 Not tainted 5.5.0-rc1-next-20191213-syzkaller #0 [ 84.592029][ T9260] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 84.606258][ T9260] Call Trace: [ 84.610077][ T9260] dump_stack+0x197/0x210 [ 84.615899][ T9260] ? generic_make_request_checks+0x1be0/0x2190 [ 84.623461][ T9260] panic+0x2e3/0x75c [ 84.628332][ T9260] ? add_taint.cold+0x16/0x16 [ 84.634499][ T9260] ? __kasan_check_write+0x14/0x20 [ 84.644027][ T9260] ? __warn.cold+0x14/0x3e [ 84.650011][ T9260] ? __warn+0xd9/0x1cf [ 84.655726][ T9260] ? generic_make_request_checks+0x1c78/0x2190 [ 84.664010][ T9260] __warn.cold+0x2f/0x3e [ 84.669494][ T9260] ? generic_make_request_checks+0x1c78/0x2190 [ 84.677425][ T9260] report_bug+0x289/0x300 [ 84.684198][ T9260] do_error_trap+0x11b/0x200 [ 84.691994][ T9260] do_invalid_op+0x37/0x50 [ 84.697862][ T9260] ? generic_make_request_checks+0x1c78/0x2190 [ 84.704838][ T9260] invalid_op+0x23/0x30 [ 84.709617][ T9260] RIP: 0010:generic_make_request_checks+0x1c78/0x2190 [ 84.720228][ T9260] Code: 00 00 44 8b ab 5c 05 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 7a 97 05 00 48 c7 c7 00 2e 6e 88 48 89 c6 44 89 ea e8 77 7b ca fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 84.745185][ T9260] RSP: 0018:ffffc90001df71c0 EFLAGS: 00010286 [ 84.752343][ T9260] RAX: 0000000000000000 RBX: ffff8880a1518000 RCX: 0000000000000000 [ 84.760562][ T9260] RDX: 0000000000000000 RSI: ffffffff815e8b66 RDI: fffff520003bee2a [ 84.769381][ T9260] RBP: ffffc90001df72c0 R08: ffff8880903245c0 R09: ffffed1015d26659 [ 84.777952][ T9260] R10: ffffed1015d26658 R11: ffff8880ae9332c7 R12: ffff88809f35e508 [ 84.786672][ T9260] R13: 0000000000000000 R14: 0000000000000001 R15: ffff88809f35e500 [ 84.797336][ T9260] ? vprintk_func+0x86/0x189 [ 84.802512][ T9260] ? __kasan_check_read+0x11/0x20 [ 84.807931][ T9260] ? mark_lock+0xc2/0x1220 [ 84.812788][ T9260] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 84.821044][ T9260] ? __lock_acquire+0x8a0/0x4a00 [ 84.827329][ T9260] ? __kasan_check_read+0x11/0x20 [ 84.832933][ T9260] ? __kasan_check_read+0x11/0x20 [ 84.838761][ T9260] generic_make_request+0x8f/0xb00 [ 84.846557][ T9260] ? __bio_associate_blkg.isra.0+0x2eb/0x700 [ 84.853311][ T9260] ? blk_queue_enter+0xe10/0xe10 [ 84.858344][ T9260] ? bio_associate_blkg_from_css+0x181/0x270 [ 84.865144][ T9260] ? find_held_lock+0x35/0x130 [ 84.871298][ T9260] submit_bio+0x113/0x600 [ 84.876817][ T9260] ? submit_bio+0x113/0x600 [ 84.881953][ T9260] ? generic_make_request+0xb00/0xb00 [ 84.888456][ T9260] ? __kasan_check_read+0x11/0x20 [ 84.893951][ T9260] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 84.900657][ T9260] submit_bh_wbc+0x6b6/0x900 [ 84.905540][ T9260] __block_write_full_page+0x7fe/0x11b0 [ 84.913348][ T9260] ? bdev_evict_inode+0x590/0x590 [ 84.919665][ T9260] ? block_commit_write+0x30/0x30 [ 84.925454][ T9260] block_write_full_page+0x21f/0x270 [ 84.931282][ T9260] ? bdev_evict_inode+0x590/0x590 [ 84.936447][ T9260] blkdev_writepage+0x25/0x30 [ 84.942393][ T9260] __writepage+0x66/0x110 [ 84.951008][ T9260] write_cache_pages+0x80c/0x13f0 [ 84.956594][ T9260] ? tag_pages_for_writeback+0x4b0/0x4b0 [ 84.963147][ T9260] ? clear_page_dirty_for_io+0xde0/0xde0 [ 84.969484][ T9260] ? lock_downgrade+0x920/0x920 [ 84.974807][ T9260] ? ep_poll_callback+0x730/0xe60 [ 84.981258][ T9260] ? __kasan_check_read+0x11/0x20 [ 84.986304][ T9260] ? mark_lock+0xc2/0x1220 [ 84.990960][ T9260] generic_writepages+0xed/0x160 [ 84.996234][ T9260] ? write_cache_pages+0x13f0/0x13f0 [ 85.002180][ T9260] ? wbc_attach_and_unlock_inode+0x4f5/0x9d0 [ 85.008779][ T9260] ? find_held_lock+0x35/0x130 [ 85.014079][ T9260] ? blkdev_readpages+0x40/0x40 [ 85.018946][ T9260] blkdev_writepages+0x1e/0x30 [ 85.024484][ T9260] do_writepages+0xfa/0x2a0 [ 85.029500][ T9260] ? page_writeback_cpu_online+0x20/0x20 [ 85.037087][ T9260] ? do_raw_spin_unlock+0x181/0x270 [ 85.043881][ T9260] ? _raw_spin_unlock+0x28/0x40 [ 85.049955][ T9260] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 85.056689][ T9260] ? wbc_attach_and_unlock_inode+0x617/0x9d0 [ 85.063059][ T9260] __filemap_fdatawrite_range+0x2bc/0x3b0 [ 85.069567][ T9260] ? delete_from_page_cache_batch+0xfe0/0xfe0 [ 85.079675][ T9260] ? lock_downgrade+0x920/0x920 [ 85.087884][ T9260] filemap_write_and_wait+0xf8/0x1e0 [ 85.095615][ T9260] __blkdev_put+0x204/0x810 [ 85.101254][ T9260] ? bd_set_size+0xb0/0xb0 [ 85.106743][ T9260] ? wait_for_completion+0x440/0x440 [ 85.113644][ T9260] blkdev_put+0x98/0x560 [ 85.119522][ T9260] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 85.127368][ T9260] blkdev_close+0x8b/0xb0 [ 85.134429][ T9260] __fput+0x2ff/0x890 [ 85.139438][ T9260] ? blkdev_put+0x560/0x560 [ 85.144485][ T9260] ____fput+0x16/0x20 [ 85.149050][ T9260] task_work_run+0x145/0x1c0 [ 85.154149][ T9260] do_exit+0x909/0x2f20 [ 85.158571][ T9260] ? mm_update_next_owner+0x7c0/0x7c0 [ 85.164637][ T9260] ? tomoyo_file_ioctl+0x23/0x30 [ 85.170302][ T9260] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 85.181702][ T9260] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 85.188460][ T9260] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 85.194103][ T9260] do_group_exit+0x135/0x360 [ 85.200290][ T9260] __x64_sys_exit_group+0x44/0x50 [ 85.208341][ T9260] do_syscall_64+0xfa/0x790 [ 85.214915][ T9260] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 85.223005][ T9260] RIP: 0033:0x43edf8 [ 85.228329][ T9260] Code: c9 01 c0 29 c1 83 c1 30 42 88 0c 06 44 0f b6 47 08 44 89 c0 f6 ea 66 c1 e8 08 89 c1 44 89 c0 c0 f8 07 c0 f9 02 29 c1 41 8d 43 <03> 8d 0c 89 48 98 01 c9 41 29 c8 41 83 c0 30 46 88 04 0e c6 04 06 [ 85.255587][ T9260] RSP: 002b:00007ffdbe020968 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 85.268323][ T9260] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043edf8 [ 85.278601][ T9260] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 85.288955][ T9260] RBP: 00000000004be608 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 85.297690][ T9260] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000001 [ 85.309348][ T9260] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 85.321742][ T9260] Kernel Offset: disabled [ 85.327875][ T9260] Rebooting in 86400 seconds..