------------[ cut here ]------------
generic_make_request: Trying to write to read-only block-device loop0 (partno 0)
WARNING: CPU: 1 PID: 10935 at block/blk-core.c:800 bio_check_ro block/blk-core.c:797 [inline]
WARNING: CPU: 1 PID: 10935 at block/blk-core.c:800 generic_make_request_checks+0x633/0x1a60 block/blk-core.c:902
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 10935 Comm: syz-executor.0 Not tainted 5.4.0-rc8-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+0x1fb/0x318 lib/dump_stack.c:118
 panic+0x264/0x7a9 kernel/panic.c:221
 __warn+0x20e/0x210 kernel/panic.c:582
 report_bug+0x1b6/0x2f0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0xd7/0x440 arch/x86/kernel/traps.c:272
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:291
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:bio_check_ro block/blk-core.c:797 [inline]
RIP: 0010:generic_make_request_checks+0x633/0x1a60 block/blk-core.c:902
Code: 3c 05 00 00 4c 89 f8 48 c1 e8 03 8a 04 08 84 c0 0f 85 17 14 00 00 41 8b 17 48 c7 c7 73 98 40 88 4c 89 f6 31 c0 e8 8d 5c 14 fe <0f> 0b e9 35 fc ff ff e8 41 c6 41 fe c6 05 b6 55 89 05 01 48 c7 c7
RSP: 0018:ffff8880636bf600 EFLAGS: 00010246
RAX: e1b838d40f386200 RBX: 0000000000000001 RCX: ffff8880a13c2080
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffff8880636bf6c0 R08: ffffffff815cc0f4 R09: fffffbfff12bc2c3
R10: fffffbfff12bc2c3 R11: 0000000000000000 R12: ffff8880a36796c8
R13: 1ffff110146cf2d9 R14: ffff8880636bf660 R15: ffff8880a367c53c
 generic_make_request+0x33/0x980 block/blk-core.c:1018
 submit_bio+0x26b/0x540 block/blk-core.c:1190
 submit_bh_wbc+0x619/0x700 fs/buffer.c:3095
 submit_bh fs/buffer.c:3101 [inline]
 __sync_dirty_buffer+0x1a2/0x2d0 fs/buffer.c:3187
 sync_dirty_buffer+0x1a/0x20 fs/buffer.c:3200
 fat_set_state+0x261/0x340 fs/fat/inode.c:708
 fat_put_super+0x48/0xc0 fs/fat/inode.c:734
 generic_shutdown_super+0x13f/0x2c0 fs/super.c:462
 kill_block_super+0x80/0xe0 fs/super.c:1442
 deactivate_locked_super+0xa8/0x100 fs/super.c:335
 deactivate_super+0x16c/0x200 fs/super.c:366
 cleanup_mnt+0x43b/0x4f0 fs/namespace.c:1102
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1109
 task_work_run+0x17e/0x1b0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x5e8/0x2190 kernel/exit.c:817
 do_group_exit+0x15c/0x2b0 kernel/exit.c:921
 get_signal+0x4ac/0x1d60 kernel/signal.c:2734
 do_signal+0x37/0x640 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop arch/x86/entry/common.c:159 [inline]
 prepare_exit_to_usermode+0x303/0x580 arch/x86/entry/common.c:194
 syscall_return_slowpath+0x113/0x4a0 arch/x86/entry/common.c:274
 do_syscall_64+0x11f/0x1c0 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a639
Code: Bad RIP value.
RSP: 002b:00007ff54bea7cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075bf28 RCX: 000000000045a639
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bf28
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bf2c
R13: 00007fffeeb9e23f R14: 00007ff54bea89c0 R15: 000000000075bf2c
Kernel Offset: disabled
Rebooting in 86400 seconds..