audit: type=1400 audit(1539689281.126:36): avc:  denied  { map } for  pid=5520 comm="syz-executor289" path="/root/syz-executor289618659" 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
audit: type=1400 audit(1539689281.126:37): avc:  denied  { map } for  pid=5520 comm="syz-executor289" path="/dev/nullb0" dev="devtmpfs" ino=14151 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:device_t:s0 tclass=blk_file permissive=1
------------[ cut here ]------------
generic_make_request: Trying to write to read-only block-device nullb0 (partno 0)
WARNING: CPU: 0 PID: 5520 at block/blk-core.c:2175 bio_check_ro block/blk-core.c:2172 [inline]
WARNING: CPU: 0 PID: 5520 at block/blk-core.c:2175 generic_make_request_checks+0xef9/0x26c0 block/blk-core.c:2277
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 5520 Comm: syz-executor289 Not tainted 4.19.0-rc8+ #64
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+0x1c4/0x2b4 lib/dump_stack.c:113
 panic+0x238/0x4e7 kernel/panic.c:184
 __warn.cold.8+0x163/0x1ba kernel/panic.c:536
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:993
RIP: 0010:bio_check_ro block/blk-core.c:2172 [inline]
RIP: 0010:generic_make_request_checks+0xef9/0x26c0 block/blk-core.c:2277
Code: 8b ad e4 04 00 00 4c 8d b5 78 ff ff ff 48 89 df 4c 89 f6 e8 29 82 07 00 48 c7 c7 a0 f3 3e 88 48 89 c6 44 89 ea e8 57 61 d5 fd <0f> 0b e9 c1 f4 ff ff e8 1b 92 0b fe e8 d6 32 f5 fd e8 11 92 0b fe
RSP: 0018:ffff8801c389e430 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff8801d8bd9980 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8164d435 RDI: 0000000000000005
RBP: ffff8801c389e730 R08: ffff8801c3400600 R09: ffffed003b5c4fe8
R10: ffffed003b5c4fe8 R11: ffff8801dae27f47 R12: ffff8801d8bd9988
R13: 0000000000000000 R14: ffff8801c389e6a8 R15: ffff8801d14c4080
 generic_make_request+0x2bd/0x15a0 block/blk-core.c:2401
 submit_bio+0xba/0x460 block/blk-core.c:2566
 submit_bh_wbc+0x5de/0x790 fs/buffer.c:3087
 __block_write_full_page+0x931/0x1490 fs/buffer.c:1765
 block_write_full_page+0x221/0x270 fs/buffer.c:2955
 blkdev_writepage+0x24/0x30 fs/block_dev.c:567
 __writepage+0x69/0xe0 mm/page-writeback.c:2301
 write_cache_pages+0xd8e/0x1e50 mm/page-writeback.c:2239
 generic_writepages+0xda/0x150 mm/page-writeback.c:2325
 blkdev_writepages+0x1d/0x30 fs/block_dev.c:1957
 do_writepages+0x9a/0x1a0 mm/page-writeback.c:2340
 __filemap_fdatawrite_range+0x364/0x4a0 mm/filemap.c:445
 __filemap_fdatawrite mm/filemap.c:453 [inline]
 filemap_fdatawrite mm/filemap.c:458 [inline]
 filemap_write_and_wait+0x44/0xc0 mm/filemap.c:617
 __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+0x385/0xa30 fs/file_table.c:278
 ____fput+0x15/0x20 fs/file_table.c:309
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1ad7/0x2610 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: Bad RIP value.
RSP: 002b:00007ffdc260ad68 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..