------------[ cut here ]------------
generic_make_request: Trying to write to read-only block-device loop0 (partno 0)
WARNING: CPU: 1 PID: 6005 at block/blk-core.c:2170 bio_check_ro block/blk-core.c:2167 [inline]
WARNING: CPU: 1 PID: 6005 at block/blk-core.c:2170 generic_make_request_checks+0xef9/0x26c0 block/blk-core.c:2272
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 6005 Comm: syz-executor820 Not tainted 4.20.0-rc4+ #350
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:2167 [inline]
RIP: 0010:generic_make_request_checks+0xef9/0x26c0 block/blk-core.c:2272
Code: 8b ad e4 04 00 00 4c 8d b5 78 ff ff ff 48 89 df 4c 89 f6 e8 99 93 07 00 48 c7 c7 20 2b 5f 88 48 89 c6 44 89 ea e8 57 d0 cf fd <0f> 0b e9 c1 f4 ff ff e8 fb 6f 06 fe e8 a6 47 f0 fd e8 f1 6f 06 fe
RSP: 0018:ffff8881b60ce010 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8881ce19f280 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005
RBP: ffff8881b60ce310 R08: ffff8881c2c64280 R09: ffffed103b5e5020
R10: ffffed103b5e5020 R11: ffff8881daf28107 R12: ffff8881ce19f288
R13: 0000000000000000 R14: ffff8881b60ce288 R15: ffff8881d18d6000
 generic_make_request+0x2c7/0x18a0 block/blk-core.c:2395
 submit_bio+0xba/0x460 block/blk-core.c:2560
 submit_bh_wbc+0x5de/0x790 fs/buffer.c:3087
 __block_write_full_page+0x93b/0x14a0 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:2289
 write_cache_pages+0xc91/0x1e20 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+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+0x1ad6/0x26d0 kernel/exit.c:867
 do_group_exit+0x177/0x440 kernel/exit.c:970
 get_signal+0x8b0/0x1980 kernel/signal.c:2517
 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x44a4f9
Code: 53 5f 52 45 54 5f 44 45 46 45 52 5f 43 4f 4d 4d 49 54 20 2d 20 69 67 6e 6f 72 65 64 0a 00 00 00 00 6f 75 74 70 75 74 20 70 6c <75> 67 69 6e 20 65 72 72 6f 72 3a 20 65 6e 64 54 72 61 6e 73 61 63
RSP: 002b:00007f16a1d09cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006dbc78 RCX: 000000000044a4f9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc78
RBP: 00000000006dbc70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc7c
R13: 00007fffc231cccf R14: 00007f16a1d0a9c0 R15: 00000000006dbd6c
Kernel Offset: disabled
Rebooting in 86400 seconds..