[ 38.853076] audit: type=1800 audit(1551578694.024:32): pid=7703 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 43.806746] kauditd_printk_skb: 2 callbacks suppressed [ 43.806760] audit: type=1400 audit(1551578699.074:35): avc: denied { map } for pid=7882 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.55' (ECDSA) to the list of known hosts. executing program [ 50.430303] audit: type=1400 audit(1551578705.694:36): avc: denied { map } for pid=7894 comm="syz-executor013" path="/root/syz-executor013962655" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 50.457489] audit: type=1400 audit(1551578705.704:37): avc: denied { map } for pid=7894 comm="syz-executor013" path="/dev/loop0" dev="devtmpfs" ino=87 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:fixed_disk_device_t:s0 tclass=blk_file permissive=1 [ 50.483956] ------------[ cut here ]------------ [ 50.489170] generic_make_request: Trying to write to read-only block-device loop0 (partno 0) [ 50.498458] WARNING: CPU: 0 PID: 7896 at block/blk-core.c:802 generic_make_request_checks+0x1c8a/0x2140 [ 50.507980] Kernel panic - not syncing: panic_on_warn set ... [ 50.513925] CPU: 0 PID: 7896 Comm: syz-executor013 Not tainted 5.0.0-rc8+ #2 [ 50.521099] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.530540] Call Trace: [ 50.533115] dump_stack+0x172/0x1f0 [ 50.536826] ? generic_make_request_checks+0x1bb0/0x2140 [ 50.542396] panic+0x2cb/0x65c [ 50.545572] ? __warn_printk+0xf3/0xf3 [ 50.549447] ? generic_make_request_checks+0x1c8a/0x2140 [ 50.554997] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.560519] ? __warn.cold+0x5/0x45 [ 50.564128] ? __warn+0xe8/0x1d0 [ 50.567485] ? generic_make_request_checks+0x1c8a/0x2140 [ 50.572935] __warn.cold+0x20/0x45 [ 50.576462] ? vprintk_emit+0x1ce/0x6d0 [ 50.580417] ? generic_make_request_checks+0x1c8a/0x2140 [ 50.585851] report_bug+0x263/0x2b0 [ 50.589464] do_error_trap+0x11b/0x200 [ 50.593350] do_invalid_op+0x37/0x50 [ 50.597042] ? generic_make_request_checks+0x1c8a/0x2140 [ 50.602543] invalid_op+0x14/0x20 [ 50.605986] RIP: 0010:generic_make_request_checks+0x1c8a/0x2140 [ 50.612025] Code: 00 00 44 8b ab dc 04 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 98 7c 05 00 48 c7 c7 80 a3 a0 87 48 89 c6 44 89 ea e8 c4 be 2b fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 50.631027] RSP: 0018:ffff888097d06f80 EFLAGS: 00010286 [ 50.636717] RAX: 0000000000000000 RBX: ffff8880a3dcd300 RCX: 0000000000000000 [ 50.644000] RDX: 0000000000000000 RSI: ffffffff815a9066 RDI: ffffed1012fa0de2 [ 50.651252] RBP: ffff888097d07080 R08: ffff88808585a440 R09: ffffed1015d05021 [ 50.658637] R10: ffffed1015d05020 R11: ffff8880ae828107 R12: ffff8880838a0188 [ 50.665897] R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880838a0180 [ 50.673161] ? vprintk_func+0x86/0x189 [ 50.677037] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 50.683260] ? mark_held_locks+0x100/0x100 [ 50.689011] generic_make_request+0x24c/0x12d0 [ 50.693584] ? find_held_lock+0x35/0x130 [ 50.697702] ? bio_associate_blkg_from_css+0x513/0x9d0 [ 50.702964] ? blk_queue_enter+0xe90/0xe90 [ 50.707182] ? lock_downgrade+0x810/0x810 [ 50.711315] submit_bio+0xba/0x480 [ 50.714834] ? submit_bio+0xba/0x480 [ 50.718530] ? generic_make_request+0x12d0/0x12d0 [ 50.723358] ? bio_reset+0x3b0/0x3b0 [ 50.727058] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 50.732077] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 50.737198] ? wbc_account_io+0x17e/0x2a0 [ 50.741351] submit_bh_wbc+0x5f7/0x7f0 [ 50.745238] __block_write_full_page+0x771/0x1020 [ 50.750094] ? check_disk_change+0x140/0x140 [ 50.754489] block_write_full_page+0x21f/0x270 [ 50.759051] ? check_disk_change+0x140/0x140 [ 50.763440] blkdev_writepage+0x25/0x30 [ 50.767397] __writepage+0x67/0xe0 [ 50.770921] write_cache_pages+0x8af/0x1560 [ 50.775225] ? __wb_update_bandwidth+0x670/0x670 [ 50.779981] ? clear_page_dirty_for_io+0xff0/0xff0 [ 50.784892] ? __lock_acquire+0x53b/0x4700 [ 50.789109] ? _raw_spin_unlock_irq+0x28/0x90 [ 50.793597] ? lockdep_hardirqs_on+0x415/0x5d0 [ 50.798169] ? __lock_acquire+0x53b/0x4700 [ 50.802392] generic_writepages+0xed/0x160 [ 50.806624] ? write_cache_pages+0x1560/0x1560 [ 50.811196] ? 0xffffffff81000000 [ 50.814635] ? wbc_attach_and_unlock_inode+0x51a/0x930 [ 50.819908] ? find_held_lock+0x35/0x130 [ 50.823994] ? blkdev_readpages+0x40/0x40 [ 50.828147] blkdev_writepages+0x1e/0x30 [ 50.832471] do_writepages+0xfc/0x2a0 [ 50.836259] ? page_writeback_cpu_online+0x20/0x20 [ 50.841189] ? do_raw_spin_lock+0x12a/0x2e0 [ 50.845558] ? kasan_check_read+0x11/0x20 [ 50.849692] ? do_raw_spin_unlock+0x57/0x270 [ 50.854081] ? _raw_spin_unlock+0x2d/0x50 [ 50.858275] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.863805] ? wbc_attach_and_unlock_inode+0x5c4/0x930 [ 50.869077] __filemap_fdatawrite_range+0x26d/0x340 [ 50.874121] ? delete_from_page_cache_batch+0x10e0/0x10e0 [ 50.879699] filemap_write_and_wait+0x47/0xd0 [ 50.884182] __blkdev_put+0x204/0x810 [ 50.887971] ? bd_set_size+0xb0/0xb0 [ 50.891675] ? wait_for_completion+0x440/0x440 [ 50.896246] ? kasan_check_read+0x11/0x20 [ 50.900378] blkdev_put+0x98/0x560 [ 50.903901] ? blkdev_put+0x560/0x560 [ 50.907679] blkdev_close+0x8b/0xb0 [ 50.911289] __fput+0x2df/0x8d0 [ 50.914553] ____fput+0x16/0x20 [ 50.917890] task_work_run+0x14a/0x1c0 [ 50.921775] do_exit+0x92c/0x2fd0 [ 50.925217] ? get_signal+0x331/0x1d50 [ 50.929094] ? mm_update_next_owner+0x660/0x660 [ 50.933752] ? kasan_check_read+0x11/0x20 [ 50.937894] ? _raw_spin_unlock_irq+0x28/0x90 [ 50.942374] ? get_signal+0x331/0x1d50 [ 50.946244] ? _raw_spin_unlock_irq+0x28/0x90 [ 50.950723] do_group_exit+0x135/0x370 [ 50.954602] get_signal+0x399/0x1d50 [ 50.958300] ? kasan_check_read+0x11/0x20 [ 50.962438] do_signal+0x87/0x1940 [ 50.965959] ? iterate_fd+0x360/0x360 [ 50.969740] ? kasan_check_read+0x11/0x20 [ 50.973876] ? setup_sigcontext+0x7d0/0x7d0 [ 50.978242] ? exit_to_usermode_loop+0x43/0x2c0 [ 50.982898] ? do_syscall_64+0x52d/0x610 [ 50.986946] ? exit_to_usermode_loop+0x43/0x2c0 [ 50.991619] ? lockdep_hardirqs_on+0x415/0x5d0 [ 50.996185] ? trace_hardirqs_on+0x67/0x230 [ 51.000502] exit_to_usermode_loop+0x244/0x2c0 [ 51.005077] do_syscall_64+0x52d/0x610 [ 51.008957] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.014134] RIP: 0033:0x449739 [ 51.017310] Code: 20 62 65 20 70 72 6f 63 65 73 73 65 64 0a 00 00 00 72 75 6c 65 73 65 74 2e 50 72 6f 63 65 73 73 4d 73 67 28 29 20 72 65 74 75 <72> 6e 73 20 25 64 0a 00 00 00 00 00 00 00 00 77 61 72 6e 69 6e 67 [ 51.036196] RSP: 002b:00007fccb46abcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 51.043885] RAX: 0000000000000001 RBX: 00000000006dac58 RCX: 0000000000449739 [ 51.051136] RDX: 0000000000449739 RSI: 0000000000000081 RDI: 00000000006dac5c [ 51.058388] RBP: 00000000006dac50 R08: 0000000000000000 R09: 0000000000000000 [ 51.065640] R10: 0000000000000006 R11: 0000000000000246 R12: 00000000006dac5c [ 51.072895] R13: 00007fff0c35fb1f R14: 00007fccb46ac9c0 R15: 20c49ba5e353f7cf [ 51.081324] Kernel Offset: disabled [ 51.084994] Rebooting in 86400 seconds..