[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 58.877608][ T25] audit: type=1800 audit(1574956295.907:25): pid=8961 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.905568][ T25] audit: type=1800 audit(1574956295.907:26): pid=8961 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.975432][ T25] audit: type=1800 audit(1574956295.917:27): pid=8961 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.200' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 81.358446][ T25] kauditd_printk_skb: 3 callbacks suppressed [ 81.358459][ T25] audit: type=1804 audit(1574956318.387:31): pid=9114 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor056" name="/root/file0" dev="sda1" ino=1426 res=1 [ 81.390391][ T9114] ------------[ cut here ]------------ [ 81.396462][ T9114] generic_make_request: Trying to write to read-only block-device loop0 (partno 0) [ 81.406392][ T9114] WARNING: CPU: 0 PID: 9114 at block/blk-core.c:800 generic_make_request_checks+0x1c78/0x2190 [ 81.416626][ T9114] Kernel panic - not syncing: panic_on_warn set ... [ 81.423218][ T9114] CPU: 0 PID: 9114 Comm: syz-executor056 Not tainted 5.4.0-syzkaller #0 [ 81.431524][ T9114] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.441576][ T9114] Call Trace: [ 81.444854][ T9114] dump_stack+0x197/0x210 [ 81.449171][ T9114] ? generic_make_request_checks+0x1c60/0x2190 [ 81.455307][ T9114] panic+0x2e3/0x75c [ 81.459199][ T9114] ? add_taint.cold+0x16/0x16 [ 81.463869][ T9114] ? __kasan_check_write+0x14/0x20 [ 81.468963][ T9114] ? __warn.cold+0x14/0x3e [ 81.473368][ T9114] ? __warn+0xd9/0x1cf [ 81.477438][ T9114] ? generic_make_request_checks+0x1c78/0x2190 [ 81.483572][ T9114] __warn.cold+0x2f/0x3e [ 81.487805][ T9114] ? generic_make_request_checks+0x1c78/0x2190 [ 81.493945][ T9114] report_bug+0x289/0x300 [ 81.498261][ T9114] do_error_trap+0x11b/0x200 [ 81.502842][ T9114] do_invalid_op+0x37/0x50 [ 81.507238][ T9114] ? generic_make_request_checks+0x1c78/0x2190 [ 81.513375][ T9114] invalid_op+0x23/0x30 [ 81.517521][ T9114] RIP: 0010:generic_make_request_checks+0x1c78/0x2190 [ 81.524368][ T9114] Code: 00 00 44 8b ab 5c 05 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 5a 94 05 00 48 c7 c7 c0 47 05 88 48 89 c6 44 89 ea e8 a7 e4 0e fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 81.543963][ T9114] RSP: 0018:ffff8880957071c0 EFLAGS: 00010286 [ 81.550014][ T9114] RAX: 0000000000000000 RBX: ffff8880a3af2000 RCX: 0000000000000000 [ 81.557969][ T9114] RDX: 0000000000000000 RSI: ffffffff815dc196 RDI: ffffed1012ae0e2a [ 81.565925][ T9114] RBP: ffff8880957072c0 R08: ffff888093ace600 R09: ffffed1015d06621 [ 81.573877][ T9114] R10: ffffed1015d06620 R11: ffff8880ae833107 R12: ffff8880a8dbc008 [ 81.581828][ T9114] R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a8dbc000 [ 81.589797][ T9114] ? vprintk_func+0x86/0x189 [ 81.594383][ T9114] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 81.601301][ T9114] ? __kasan_check_read+0x11/0x20 [ 81.606327][ T9114] ? __lock_acquire+0x8a0/0x4a00 [ 81.611258][ T9114] ? __kasan_check_read+0x11/0x20 [ 81.616276][ T9114] generic_make_request+0x8f/0xb50 [ 81.621374][ T9114] ? blk_queue_enter+0xe30/0xe30 [ 81.626297][ T9114] ? lock_downgrade+0x920/0x920 [ 81.631285][ T9114] submit_bio+0x113/0x600 [ 81.635606][ T9114] ? submit_bio+0x113/0x600 [ 81.640100][ T9114] ? generic_make_request+0xb50/0xb50 [ 81.645457][ T9114] ? bio_associate_blkg_from_css+0x4fd/0x980 [ 81.651423][ T9114] ? bio_reset+0x3a0/0x3a0 [ 81.655852][ T9114] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 81.661647][ T9114] ? guard_bio_eod+0x28f/0x6c0 [ 81.666398][ T9114] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 81.672142][ T9114] submit_bh_wbc+0x6b6/0x900 [ 81.676738][ T9114] __block_write_full_page+0x7fe/0x11b0 [ 81.682291][ T9114] ? bdev_evict_inode+0x5c0/0x5c0 [ 81.687312][ T9114] ? __getblk_gfp+0xa10/0xa10 [ 81.692002][ T9114] block_write_full_page+0x21f/0x270 [ 81.697276][ T9114] ? bdev_evict_inode+0x5c0/0x5c0 [ 81.702289][ T9114] blkdev_writepage+0x25/0x30 [ 81.706969][ T9114] __writepage+0x66/0x110 [ 81.711285][ T9114] write_cache_pages+0x80c/0x13f0 [ 81.716303][ T9114] ? tag_pages_for_writeback+0x4b0/0x4b0 [ 81.721924][ T9114] ? clear_page_dirty_for_io+0xde0/0xde0 [ 81.727549][ T9114] ? rwsem_down_write_slowpath+0xbdf/0xf80 [ 81.733350][ T9114] ? lock_downgrade+0x920/0x920 [ 81.738190][ T9114] generic_writepages+0xed/0x160 [ 81.743115][ T9114] ? write_cache_pages+0x13f0/0x13f0 [ 81.748419][ T9114] ? wbc_attach_and_unlock_inode+0x515/0xa00 [ 81.754386][ T9114] ? find_held_lock+0x35/0x130 [ 81.759140][ T9114] ? blkdev_readpages+0x40/0x40 [ 81.763973][ T9114] blkdev_writepages+0x1e/0x30 [ 81.768724][ T9114] do_writepages+0xfa/0x2a0 [ 81.773233][ T9114] ? page_writeback_cpu_online+0x20/0x20 [ 81.778855][ T9114] ? do_raw_spin_unlock+0x178/0x270 [ 81.784043][ T9114] ? _raw_spin_unlock+0x28/0x40 [ 81.788894][ T9114] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 81.795120][ T9114] ? wbc_attach_and_unlock_inode+0x637/0xa00 [ 81.801089][ T9114] __filemap_fdatawrite_range+0x2bc/0x3b0 [ 81.806794][ T9114] ? delete_from_page_cache_batch+0xfe0/0xfe0 [ 81.812855][ T9114] ? lock_downgrade+0x920/0x920 [ 81.817715][ T9114] filemap_write_and_wait+0xf8/0x1e0 [ 81.823000][ T9114] __blkdev_put+0x204/0x810 [ 81.827513][ T9114] ? bd_set_size+0xb0/0xb0 [ 81.831919][ T9114] ? wait_for_completion+0x440/0x440 [ 81.837196][ T9114] blkdev_put+0x98/0x560 [ 81.841429][ T9114] blkdev_close+0x8b/0xb0 [ 81.845759][ T9114] __fput+0x2ff/0x890 [ 81.849740][ T9114] ? blkdev_put+0x560/0x560 [ 81.854233][ T9114] ____fput+0x16/0x20 [ 81.858201][ T9114] task_work_run+0x145/0x1c0 [ 81.862795][ T9114] do_exit+0x8e7/0x2e00 [ 81.866945][ T9114] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 81.873177][ T9114] ? mm_update_next_owner+0x7c0/0x7c0 [ 81.878544][ T9114] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 81.883994][ T9114] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 81.889440][ T9114] do_group_exit+0x135/0x360 [ 81.894019][ T9114] __x64_sys_exit_group+0x44/0x50 [ 81.899030][ T9114] do_syscall_64+0xfa/0x790 [ 81.903528][ T9114] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 81.909419][ T9114] RIP: 0033:0x442c38 [ 81.913448][ T9114] Code: 00 00 ea dc 40 00 00 00 00 00 c8 de 40 00 00 00 00 00 ea dc 40 00 00 00 00 00 ea dc 40 00 00 00 00 00 ea dc 40 00 00 00 00 00 <ea> dc 40 00 00 00 00 00 ea dc 40 00 00 00 00 00 ea dc 40 00 00 00 [ 81.933066][ T9114] RSP: 002b:00007fffc31b9748 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 81.941475][ T9114] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442c38 [ 81.949432][ T9114] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 81.957403][ T9114] RBP: 00000000004c2548 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 81.965879][ T9114] R10: 00000000004002e0 R11: 0000000000000246 R12: 0000000000000001 [ 81.973833][ T9114] R13: 00000000006d41a0 R14: 0000000000000000 R15: 0000000000000000 [ 81.983494][ T9114] Kernel Offset: disabled [ 81.987970][ T9114] Rebooting in 86400 seconds..