audit: type=1400 audit(1575203355.922:36): avc:  denied  { map } for  pid=7887 comm="syz-executor322" path="/root/syz-executor322734621" 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(1575203355.962:37): avc:  denied  { map } for  pid=7887 comm="syz-executor322" path="/dev/nullb0" dev="devtmpfs" ino=17394 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: 7889 at block/blk-core.c:2180 bio_check_ro block/blk-core.c:2180 [inline]
WARNING: CPU: 0 PID: 7889 at block/blk-core.c:2180 generic_make_request_checks+0x1fc5/0x24c0 block/blk-core.c:2285
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 7889 Comm: syz-executor322 Not tainted 4.19.87-syzkaller #0
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+0x197/0x210 lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x53 kernel/panic.c:541
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x204/0x360 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:1037
RIP: 0010:bio_check_ro block/blk-core.c:2180 [inline]
RIP: 0010:generic_make_request_checks+0x1fc5/0x24c0 block/blk-core.c:2285
Code: 85 1f 04 00 00 45 8b b6 e4 04 00 00 48 8d 73 a0 4c 89 e7 e8 fd 67 06 00 48 c7 c7 a0 8f e8 87 48 89 c6 44 89 f2 e8 d9 42 f2 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02
RSP: 0018:ffff888088936f08 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff888088936fd8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81558bd6 RDI: ffffed1011126dd3
RBP: ffff888088937000 R08: ffff8880a5414100 R09: ffffed1015d05079
R10: ffffed1015d05078 R11: ffff8880ae8283c7 R12: ffff888096ab4200
R13: ffff888096ab4208 R14: 0000000000000000 R15: 0000000000000000
 generic_make_request+0x24c/0x12d0 block/blk-core.c:2409
 submit_bio+0xba/0x480 block/blk-core.c:2573
 submit_bh_wbc+0x5dc/0x790 fs/buffer.c:3095
 __block_write_full_page+0x76e/0x1010 fs/buffer.c:1766
 block_write_full_page+0x21f/0x270 fs/buffer.c:2956
 blkdev_writepage+0x25/0x30 fs/block_dev.c:581
 __writepage+0x62/0xe0 mm/page-writeback.c:2305
 write_cache_pages+0x8ac/0x1560 mm/page-writeback.c:2240
 generic_writepages mm/page-writeback.c:2329 [inline]
 generic_writepages+0xe6/0x160 mm/page-writeback.c:2318
 blkdev_writepages+0x1e/0x30 fs/block_dev.c:1965
 do_writepages+0xf3/0x2a0 mm/page-writeback.c:2344
 __filemap_fdatawrite_range+0x28d/0x370 mm/filemap.c:446
 __filemap_fdatawrite mm/filemap.c:454 [inline]
 filemap_fdatawrite mm/filemap.c:459 [inline]
 filemap_write_and_wait mm/filemap.c:640 [inline]
 filemap_write_and_wait+0x47/0xd0 mm/filemap.c:635
 __sync_blockdev fs/block_dev.c:463 [inline]
 sync_blockdev fs/block_dev.c:472 [inline]
 __blkdev_put+0x204/0x810 fs/block_dev.c:1797
 blkdev_put+0x98/0x560 fs/block_dev.c:1866
 blkdev_close+0x8b/0xb0 fs/block_dev.c:1873
 __fput+0x2dd/0x8b0 fs/file_table.c:278
 ____fput+0x16/0x20 fs/file_table.c:309
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x994/0x3080 kernel/exit.c:876
 do_group_exit+0x135/0x370 kernel/exit.c:979
 get_signal+0x3ec/0x1fc0 kernel/signal.c:2578
 do_signal+0x95/0x1960 arch/x86/kernel/signal.c:821
 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445819
Code: Bad RIP value.
RSP: 002b:00007f4d0fb52db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006dac38 RCX: 0000000000445819
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dac38
RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c
R13: 00007ffc6acaf60f R14: 00007f4d0fb539c0 R15: 20c49ba5e353f7cf
Kernel Offset: disabled
Rebooting in 86400 seconds..