[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 60.528995][ T27] audit: type=1800 audit(1576239940.141:25): pid=8829 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 60.549188][ T27] audit: type=1800 audit(1576239940.141:26): pid=8829 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 60.585221][ T27] audit: type=1800 audit(1576239940.141:27): pid=8829 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 '10.128.0.210' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 68.640327][ T27] kauditd_printk_skb: 3 callbacks suppressed [ 68.640339][ T27] audit: type=1804 audit(1576239948.251:31): pid=8982 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor967" name="/root/file0" dev="sda1" ino=16484 res=1 [ 68.671207][ T8982] ------------[ cut here ]------------ [ 68.677014][ T8982] generic_make_request: Trying to write to read-only block-device loop0 (partno 0) [ 68.695812][ T8982] WARNING: CPU: 1 PID: 8982 at block/blk-core.c:829 generic_make_request_checks+0x1c78/0x2190 [ 68.706068][ T8982] Kernel panic - not syncing: panic_on_warn set ... [ 68.712637][ T8982] CPU: 1 PID: 8982 Comm: syz-executor967 Not tainted 5.5.0-rc1-next-20191212-syzkaller #0 [ 68.722547][ T8982] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.732577][ T8982] Call Trace: [ 68.735852][ T8982] dump_stack+0x197/0x210 [ 68.740162][ T8982] ? generic_make_request_checks+0x1c60/0x2190 [ 68.746292][ T8982] panic+0x2e3/0x75c [ 68.750180][ T8982] ? add_taint.cold+0x16/0x16 [ 68.754838][ T8982] ? __kasan_check_write+0x14/0x20 [ 68.759968][ T8982] ? __warn.cold+0x14/0x3e [ 68.764359][ T8982] ? __warn+0xd9/0x1cf [ 68.768408][ T8982] ? generic_make_request_checks+0x1c78/0x2190 [ 68.774575][ T8982] __warn.cold+0x2f/0x3e [ 68.778795][ T8982] ? generic_make_request_checks+0x1c78/0x2190 [ 68.784959][ T8982] report_bug+0x289/0x300 [ 68.789271][ T8982] do_error_trap+0x11b/0x200 [ 68.793841][ T8982] do_invalid_op+0x37/0x50 [ 68.798238][ T8982] ? generic_make_request_checks+0x1c78/0x2190 [ 68.804369][ T8982] invalid_op+0x23/0x30 [ 68.808503][ T8982] RIP: 0010:generic_make_request_checks+0x1c78/0x2190 [ 68.815256][ T8982] 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 f7 7a ca fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 68.834875][ T8982] RSP: 0018:ffffc900075371c0 EFLAGS: 00010286 [ 68.840924][ T8982] RAX: 0000000000000000 RBX: ffff8880a2200000 RCX: 0000000000000000 [ 68.848873][ T8982] RDX: 0000000000000000 RSI: ffffffff815e8b66 RDI: fffff52000ea6e2a [ 68.856820][ T8982] RBP: ffffc900075372c0 R08: ffff8880a2d1a280 R09: ffffed1015d26659 [ 68.864772][ T8982] R10: ffffed1015d26658 R11: ffff8880ae9332c7 R12: ffff8880a881ac08 [ 68.872720][ T8982] R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a881ac00 [ 68.880689][ T8982] ? vprintk_func+0x86/0x189 [ 68.885261][ T8982] ? __kasan_check_read+0x11/0x20 [ 68.890372][ T8982] ? mark_lock+0xc2/0x1220 [ 68.894790][ T8982] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 68.901758][ T8982] ? __lock_acquire+0x8a0/0x4a00 [ 68.906921][ T8982] ? __kasan_check_read+0x11/0x20 [ 68.911926][ T8982] ? __kasan_check_read+0x11/0x20 [ 68.916938][ T8982] generic_make_request+0x8f/0xb00 [ 68.922034][ T8982] ? __bio_associate_blkg.isra.0+0x2eb/0x700 [ 68.927997][ T8982] ? blk_queue_enter+0xe10/0xe10 [ 68.932918][ T8982] ? bio_associate_blkg_from_css+0x181/0x270 [ 68.938877][ T8982] ? find_held_lock+0x35/0x130 [ 68.943642][ T8982] submit_bio+0x113/0x600 [ 68.948023][ T8982] ? submit_bio+0x113/0x600 [ 68.952521][ T8982] ? generic_make_request+0xb00/0xb00 [ 68.957885][ T8982] ? __kasan_check_read+0x11/0x20 [ 68.962892][ T8982] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 68.968634][ T8982] submit_bh_wbc+0x6b6/0x900 [ 68.973330][ T8982] __block_write_full_page+0x7fe/0x11b0 [ 68.978892][ T8982] ? bdev_evict_inode+0x590/0x590 [ 68.983891][ T8982] ? block_commit_write+0x30/0x30 [ 68.988896][ T8982] block_write_full_page+0x21f/0x270 [ 68.994176][ T8982] ? bdev_evict_inode+0x590/0x590 [ 68.999181][ T8982] blkdev_writepage+0x25/0x30 [ 69.003849][ T8982] __writepage+0x66/0x110 [ 69.008169][ T8982] write_cache_pages+0x80c/0x13f0 [ 69.013212][ T8982] ? tag_pages_for_writeback+0x4b0/0x4b0 [ 69.018830][ T8982] ? clear_page_dirty_for_io+0xde0/0xde0 [ 69.024450][ T8982] ? mutex_destroy+0x6f/0x100 [ 69.029113][ T8982] ? lock_downgrade+0x920/0x920 [ 69.033950][ T8982] generic_writepages+0xed/0x160 [ 69.039043][ T8982] ? write_cache_pages+0x13f0/0x13f0 [ 69.044410][ T8982] ? wbc_attach_and_unlock_inode+0x4f5/0x9d0 [ 69.050367][ T8982] ? find_held_lock+0x35/0x130 [ 69.055111][ T8982] ? blkdev_readpages+0x40/0x40 [ 69.059938][ T8982] blkdev_writepages+0x1e/0x30 [ 69.064681][ T8982] do_writepages+0xfa/0x2a0 [ 69.069164][ T8982] ? page_writeback_cpu_online+0x20/0x20 [ 69.074789][ T8982] ? do_raw_spin_unlock+0x181/0x270 [ 69.079967][ T8982] ? _raw_spin_unlock+0x28/0x40 [ 69.084796][ T8982] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 69.091012][ T8982] ? wbc_attach_and_unlock_inode+0x617/0x9d0 [ 69.096970][ T8982] __filemap_fdatawrite_range+0x2bc/0x3b0 [ 69.102667][ T8982] ? delete_from_page_cache_batch+0xfe0/0xfe0 [ 69.108715][ T8982] ? lock_downgrade+0x920/0x920 [ 69.113559][ T8982] filemap_write_and_wait+0xf8/0x1e0 [ 69.118821][ T8982] __blkdev_put+0x204/0x810 [ 69.123305][ T8982] ? bd_set_size+0xb0/0xb0 [ 69.127699][ T8982] ? wait_for_completion+0x440/0x440 [ 69.132965][ T8982] blkdev_put+0x98/0x560 [ 69.137201][ T8982] blkdev_close+0x8b/0xb0 [ 69.141511][ T8982] __fput+0x2ff/0x890 [ 69.145472][ T8982] ? blkdev_put+0x560/0x560 [ 69.149955][ T8982] ____fput+0x16/0x20 [ 69.153913][ T8982] task_work_run+0x145/0x1c0 [ 69.158489][ T8982] do_exit+0x909/0x2f20 [ 69.162623][ T8982] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 69.168847][ T8982] ? mm_update_next_owner+0x7c0/0x7c0 [ 69.174198][ T8982] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 69.179649][ T8982] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 69.185086][ T8982] do_group_exit+0x135/0x360 [ 69.189654][ T8982] __x64_sys_exit_group+0x44/0x50 [ 69.194655][ T8982] do_syscall_64+0xfa/0x790 [ 69.199149][ T8982] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 69.205017][ T8982] RIP: 0033:0x442c38 [ 69.208911][ T8982] Code: Bad RIP value. [ 69.212953][ T8982] RSP: 002b:00007ffdc8751938 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 69.221339][ T8982] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442c38 [ 69.229561][ T8982] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 69.237510][ T8982] RBP: 00000000004c2548 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 69.245456][ T8982] R10: 00000000004002e0 R11: 0000000000000246 R12: 0000000000000001 [ 69.253419][ T8982] R13: 00000000006d41a0 R14: 0000000000000000 R15: 0000000000000000 [ 69.262805][ T8982] Kernel Offset: disabled [ 69.267204][ T8982] Rebooting in 86400 seconds..