[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 57.646884][ T26] audit: type=1800 audit(1575003957.638:25): pid=8876 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 57.676890][ T26] audit: type=1800 audit(1575003957.638:26): pid=8876 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 57.717681][ T26] audit: type=1800 audit(1575003957.638:27): pid=8876 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 '10.128.1.33' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 68.109268][ T26] kauditd_printk_skb: 3 callbacks suppressed [ 68.109280][ T26] audit: type=1804 audit(1575003968.098:31): pid=9028 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor042" name="/root/file0" dev="sda1" ino=16485 res=1 [ 68.140927][ T9028] ------------[ cut here ]------------ [ 68.146679][ T9028] generic_make_request: Trying to write to read-only block-device loop0 (partno 0) [ 68.156421][ T9028] WARNING: CPU: 1 PID: 9028 at block/blk-core.c:800 generic_make_request_checks+0x1c78/0x2190 [ 68.166661][ T9028] Kernel panic - not syncing: panic_on_warn set ... [ 68.173258][ T9028] CPU: 1 PID: 9028 Comm: syz-executor042 Not tainted 5.4.0-syzkaller #0 [ 68.181566][ T9028] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.191624][ T9028] Call Trace: [ 68.194904][ T9028] dump_stack+0x197/0x210 [ 68.199216][ T9028] ? generic_make_request_checks+0x1be0/0x2190 [ 68.205350][ T9028] panic+0x2e3/0x75c [ 68.209280][ T9028] ? add_taint.cold+0x16/0x16 [ 68.213942][ T9028] ? __kasan_check_write+0x14/0x20 [ 68.219031][ T9028] ? __warn.cold+0x14/0x3e [ 68.223428][ T9028] ? __warn+0xd9/0x1cf [ 68.227521][ T9028] ? generic_make_request_checks+0x1c78/0x2190 [ 68.233656][ T9028] __warn.cold+0x2f/0x3e [ 68.237886][ T9028] ? generic_make_request_checks+0x1c78/0x2190 [ 68.244016][ T9028] report_bug+0x289/0x300 [ 68.248337][ T9028] do_error_trap+0x11b/0x200 [ 68.252903][ T9028] do_invalid_op+0x37/0x50 [ 68.257300][ T9028] ? generic_make_request_checks+0x1c78/0x2190 [ 68.263440][ T9028] invalid_op+0x23/0x30 [ 68.267594][ T9028] RIP: 0010:generic_make_request_checks+0x1c78/0x2190 [ 68.274346][ T9028] 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 80 49 05 88 48 89 c6 44 89 ea e8 27 ce 0e fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 68.295343][ T9028] RSP: 0018:ffff8880a14ff1c0 EFLAGS: 00010286 [ 68.301394][ T9028] RAX: 0000000000000000 RBX: ffff8880a3ad6000 RCX: 0000000000000000 [ 68.309351][ T9028] RDX: 0000000000000000 RSI: ffffffff815dc196 RDI: ffffed101429fe2a [ 68.317307][ T9028] RBP: ffff8880a14ff2c0 R08: ffff8880a5aba5c0 R09: ffffed1015d26621 [ 68.325258][ T9028] R10: ffffed1015d26620 R11: ffff8880ae933107 R12: ffff8880a22a7508 [ 68.333207][ T9028] R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a22a7500 [ 68.341176][ T9028] ? vprintk_func+0x86/0x189 [ 68.345753][ T9028] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 68.352672][ T9028] ? __kasan_check_read+0x11/0x20 [ 68.357681][ T9028] ? __lock_acquire+0x8a0/0x4a00 [ 68.362592][ T9028] ? __kasan_check_read+0x11/0x20 [ 68.367595][ T9028] generic_make_request+0x8f/0xb50 [ 68.372686][ T9028] ? blk_queue_enter+0xe30/0xe30 [ 68.377611][ T9028] ? lock_downgrade+0x920/0x920 [ 68.382440][ T9028] submit_bio+0x113/0x600 [ 68.386754][ T9028] ? submit_bio+0x113/0x600 [ 68.391233][ T9028] ? generic_make_request+0xb50/0xb50 [ 68.396591][ T9028] ? bio_associate_blkg_from_css+0x4fd/0x980 [ 68.402644][ T9028] ? bio_reset+0x3a0/0x3a0 [ 68.407048][ T9028] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 68.412755][ T9028] ? guard_bio_eod+0x28f/0x6c0 [ 68.417514][ T9028] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 68.423210][ T9028] submit_bh_wbc+0x6b6/0x900 [ 68.427778][ T9028] __block_write_full_page+0x7fe/0x11b0 [ 68.433300][ T9028] ? bdev_evict_inode+0x5c0/0x5c0 [ 68.438300][ T9028] ? __getblk_gfp+0xa10/0xa10 [ 68.442953][ T9028] block_write_full_page+0x21f/0x270 [ 68.448213][ T9028] ? bdev_evict_inode+0x5c0/0x5c0 [ 68.453214][ T9028] blkdev_writepage+0x25/0x30 [ 68.457867][ T9028] __writepage+0x66/0x110 [ 68.462174][ T9028] write_cache_pages+0x80c/0x13f0 [ 68.467178][ T9028] ? tag_pages_for_writeback+0x4b0/0x4b0 [ 68.472801][ T9028] ? clear_page_dirty_for_io+0xde0/0xde0 [ 68.478415][ T9028] ? rwsem_down_write_slowpath+0xbdf/0xf80 [ 68.484205][ T9028] ? lock_downgrade+0x920/0x920 [ 68.489053][ T9028] generic_writepages+0xed/0x160 [ 68.493966][ T9028] ? write_cache_pages+0x13f0/0x13f0 [ 68.499246][ T9028] ? wbc_attach_and_unlock_inode+0x515/0xa00 [ 68.505211][ T9028] ? find_held_lock+0x35/0x130 [ 68.509966][ T9028] ? blkdev_readpages+0x40/0x40 [ 68.514796][ T9028] blkdev_writepages+0x1e/0x30 [ 68.519553][ T9028] do_writepages+0xfa/0x2a0 [ 68.524034][ T9028] ? page_writeback_cpu_online+0x20/0x20 [ 68.529647][ T9028] ? do_raw_spin_unlock+0x178/0x270 [ 68.534995][ T9028] ? _raw_spin_unlock+0x28/0x40 [ 68.539824][ T9028] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 68.546042][ T9028] ? wbc_attach_and_unlock_inode+0x637/0xa00 [ 68.552012][ T9028] __filemap_fdatawrite_range+0x2bc/0x3b0 [ 68.557720][ T9028] ? delete_from_page_cache_batch+0xfe0/0xfe0 [ 68.563768][ T9028] ? lock_downgrade+0x920/0x920 [ 68.568599][ T9028] filemap_write_and_wait+0xf8/0x1e0 [ 68.573872][ T9028] __blkdev_put+0x204/0x810 [ 68.578355][ T9028] ? bd_set_size+0xb0/0xb0 [ 68.582751][ T9028] ? wait_for_completion+0x440/0x440 [ 68.588026][ T9028] blkdev_put+0x98/0x560 [ 68.592245][ T9028] blkdev_close+0x8b/0xb0 [ 68.596555][ T9028] __fput+0x2ff/0x890 [ 68.601044][ T9028] ? blkdev_put+0x560/0x560 [ 68.605535][ T9028] ____fput+0x16/0x20 [ 68.609496][ T9028] task_work_run+0x145/0x1c0 [ 68.614063][ T9028] do_exit+0x8e7/0x2e00 [ 68.618198][ T9028] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 68.624688][ T9028] ? mm_update_next_owner+0x7c0/0x7c0 [ 68.630043][ T9028] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 68.635478][ T9028] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 68.641012][ T9028] do_group_exit+0x135/0x360 [ 68.645587][ T9028] __x64_sys_exit_group+0x44/0x50 [ 68.650611][ T9028] do_syscall_64+0xfa/0x790 [ 68.655128][ T9028] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.661004][ T9028] RIP: 0033:0x442c38 [ 68.664909][ T9028] Code: Bad RIP value. [ 68.669067][ T9028] RSP: 002b:00007ffd6b5e77d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 68.677456][ T9028] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442c38 [ 68.685580][ T9028] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 68.693535][ T9028] RBP: 00000000004c2548 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 68.701514][ T9028] R10: 00000000004002e0 R11: 0000000000000246 R12: 0000000000000001 [ 68.709555][ T9028] R13: 00000000006d41a0 R14: 0000000000000000 R15: 0000000000000000 [ 68.719203][ T9028] Kernel Offset: disabled [ 68.723653][ T9028] Rebooting in 86400 seconds..