audit: type=1800 audit(1539689001.895:30): pid=5451 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 ------------[ cut here ]------------ generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) WARNING: CPU: 1 PID: 5606 at block/blk-core.c:2168 bio_check_ro block/blk-core.c:2165 [inline] WARNING: CPU: 1 PID: 5606 at block/blk-core.c:2168 generic_make_request_checks+0xe5c/0x2170 block/blk-core.c:2270 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 5606 Comm: syz-executor834 Not tainted 4.19.0-rc8-next-20181016+ #95 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 panic+0x2ad/0x55c kernel/panic.c:188 __warn.cold.8+0x20/0x45 kernel/panic.c:540 report_bug+0x254/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969 RIP: 0010:bio_check_ro block/blk-core.c:2165 [inline] RIP: 0010:generic_make_request_checks+0xe5c/0x2170 block/blk-core.c:2270 Code: 8b ad e4 04 00 00 4c 8d b5 78 ff ff ff 48 89 df 4c 89 f6 e8 16 a1 07 00 48 c7 c7 20 48 3f 88 48 89 c6 44 89 ea e8 74 c4 cf fd <0f> 0b e9 44 f5 ff ff e8 a8 1b 06 fe e8 a3 e4 ef fd e8 9e 1b 06 fe RSP: 0018:ffff8801d807e488 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff8801d92d8200 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81647515 RDI: 0000000000000005 RBP: ffff8801d807e700 R08: ffff8801d8374180 R09: ffffed003b5e5008 R10: ffffed003b5e5008 R11: ffff8801daf28047 R12: ffff8801d92d8208 R13: 0000000000000000 R14: ffff8801d807e678 R15: ffff8801d179c080 generic_make_request+0x2c7/0x18a0 block/blk-core.c:2394 submit_bio+0xba/0x460 block/blk-core.c:2559 submit_bh_wbc+0x5dc/0x7c0 fs/buffer.c:3118 __block_write_full_page+0x93b/0x14a0 fs/buffer.c:1796 block_write_full_page+0x221/0x270 fs/buffer.c:2986 blkdev_writepage+0x24/0x30 fs/block_dev.c:567 __writepage+0x69/0xe0 mm/page-writeback.c:2289 write_cache_pages+0xc8c/0x1e20 mm/page-writeback.c:2230 generic_writepages+0xda/0x150 mm/page-writeback.c:2313 blkdev_writepages+0x1d/0x30 fs/block_dev.c:1957 do_writepages+0x9a/0x1a0 mm/page-writeback.c:2328 __filemap_fdatawrite_range+0x364/0x4a0 mm/filemap.c:411 __filemap_fdatawrite mm/filemap.c:419 [inline] filemap_fdatawrite mm/filemap.c:424 [inline] filemap_write_and_wait+0x44/0xc0 mm/filemap.c:594 __sync_blockdev fs/block_dev.c:449 [inline] sync_blockdev fs/block_dev.c:458 [inline] __blkdev_put+0x202/0x830 fs/block_dev.c:1789 blkdev_put+0x98/0x540 fs/block_dev.c:1858 blkdev_close+0x8b/0xb0 fs/block_dev.c:1865 __fput+0x3bc/0xa70 fs/file_table.c:279 ____fput+0x15/0x20 fs/file_table.c:312 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x1ad1/0x26d0 kernel/exit.c:867 do_group_exit+0x177/0x440 kernel/exit.c:970 __do_sys_exit_group kernel/exit.c:981 [inline] __se_sys_exit_group kernel/exit.c:979 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:979 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x43eca8 Code: 88 46 0f 44 0f b6 47 05 44 89 c0 f6 ea 41 c0 f8 07 66 c1 e8 08 89 c1 c0 f9 02 44 29 c1 89 c8 89 cb f6 ea c0 fb 07 41 89 d8 66 e8 08 c0 f8 02 44 29 c0 8d 04 80 01 c0 29 c1 83 c1 30 88 4e 11 RSP: 002b:00007fffc3847be8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043eca8 RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds..