------------[ cut here ]------------
generic_make_request: Trying to write to read-only block-device sda (partno 0)
WARNING: CPU: 0 PID: 47 at block/blk-core.c:2182 bio_check_ro block/blk-core.c:2182 [inline]
WARNING: CPU: 0 PID: 47 at block/blk-core.c:2182 generic_make_request_checks+0x17d9/0x22e0 block/blk-core.c:2287
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 47 Comm: kworker/u4:2 Not tainted 4.19.167-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x61 kernel/panic.c:541
 report_bug+0x262/0x2b0 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+0x1d7/0x310 arch/x86/kernel/traps.c:296
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:bio_check_ro block/blk-core.c:2182 [inline]
RIP: 0010:generic_make_request_checks+0x17d9/0x22e0 block/blk-core.c:2287
Code: ca 0a 00 00 45 8b b6 e4 04 00 00 48 8d 74 24 68 48 89 ef e8 d9 2b 06 00 48 c7 c7 00 06 b2 88 48 89 c6 44 89 f2 e8 d2 b7 ce 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:ffff8880b517edc0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8880ac281000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff814fde01 RDI: ffffed1016a2fdaa
RBP: ffff8880aae89500 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880aae89530
R13: ffff8880aae89508 R14: 0000000000000000 R15: 0000000000000000
 generic_make_request+0x23f/0xdf0 block/blk-core.c:2411
 blk_queue_split+0x83e/0x1700 block/blk-merge.c:226
 blk_mq_make_request+0x15d/0x1c00 block/blk-mq.c:1850
 generic_make_request+0x613/0xdf0 block/blk-core.c:2466
 submit_bio+0xb1/0x430 block/blk-core.c:2575
 ext4_io_submit fs/ext4/page-io.c:356 [inline]
 io_submit_add_bh fs/ext4/page-io.c:396 [inline]
 ext4_bio_write_page+0xa5e/0x16bd fs/ext4/page-io.c:515
 mpage_submit_page+0x14b/0x250 fs/ext4/inode.c:2235
 mpage_map_and_submit_buffers fs/ext4/inode.c:2432 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2570 [inline]
 ext4_writepages+0x20fc/0x37f0 fs/ext4/inode.c:2883
 do_writepages+0xe5/0x290 mm/page-writeback.c:2344
 __writeback_single_inode+0x113/0x1340 fs/fs-writeback.c:1382
 writeback_sb_inodes+0x537/0xef0 fs/fs-writeback.c:1646
 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1715
 wb_writeback+0x841/0xcc0 fs/fs-writeback.c:1821
 wb_check_old_data_flush fs/fs-writeback.c:1923 [inline]
 wb_do_writeback fs/fs-writeback.c:1976 [inline]
 wb_workfn+0x90f/0x12f0 fs/fs-writeback.c:2005
 process_one_work+0x864/0x1570 kernel/workqueue.c:2155
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Kernel Offset: disabled
Rebooting in 86400 seconds..