------------[ cut here ]------------
generic_make_request: Trying to write to read-only block-device loop4 (partno 0)
WARNING: CPU: 0 PID: 10401 at block/blk-core.c:797 bio_check_ro block/blk-core.c:797 [inline]
WARNING: CPU: 0 PID: 10401 at block/blk-core.c:797 generic_make_request_checks+0x1d5c/0x2210 block/blk-core.c:902
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 10401 Comm: syz-executor.4 Not tainted 5.4.0-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+0x2e3/0x75c kernel/panic.c:221
 __warn.cold+0x2f/0x35 kernel/panic.c:582
 report_bug+0x289/0x300 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x37/0x50 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+0x1d5c/0x2210 block/blk-core.c:902
Code: 00 00 44 8b ab 3c 05 00 00 48 8d b5 78 ff ff ff 4c 89 f7 e8 c6 87 05 00 48 c7 c7 60 18 e5 87 48 89 c6 44 89 ea e8 5c f9 13 fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02
RSP: 0018:ffff88809887f550 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8880a3b13000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815cf7d6 RDI: ffffed101310fe9c
RBP: ffff88809887f650 R08: ffff88806122c300 R09: ffffed1015d06159
R10: ffffed1015d06158 R11: ffff8880ae830ac7 R12: ffff8880a4a61c88
R13: 0000000000000000 R14: ffff8880a4a61c80 R15: ffff8880a3bdb138
 generic_make_request+0x8f/0xb50 block/blk-core.c:1018
 submit_bio+0x113/0x600 block/blk-core.c:1190
 submit_bh_wbc+0x6b6/0x900 fs/buffer.c:3095
 submit_bh fs/buffer.c:3101 [inline]
 __sync_dirty_buffer+0x12b/0x350 fs/buffer.c:3187
 sync_dirty_buffer+0x1b/0x20 fs/buffer.c:3200
 fat_set_state+0x242/0x330 fs/fat/inode.c:708
 fat_put_super+0x46/0xd0 fs/fat/inode.c:734
 generic_shutdown_super+0x14c/0x370 fs/super.c:462
 kill_block_super+0xa0/0x100 fs/super.c:1442
 deactivate_locked_super+0x95/0x100 fs/super.c:335
 deactivate_super fs/super.c:366 [inline]
 deactivate_super+0x1b2/0x1d0 fs/super.c:362
 cleanup_mnt+0x351/0x4c0 fs/namespace.c:1102
 __cleanup_mnt+0x16/0x20 fs/namespace.c:1109
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x904/0x2e60 kernel/exit.c:817
 do_group_exit+0x135/0x360 kernel/exit.c:921
 get_signal+0x47c/0x2500 kernel/signal.c:2734
 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a639
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f5e10e66cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075bfd0 RCX: 000000000045a639
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bfd0
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bfd4
R13: 00007ffe24ff70ff R14: 00007f5e10e679c0 R15: 000000000075bfd4
Kernel Offset: disabled
Rebooting in 86400 seconds..