------------[ cut here ]------------
Trying to write to read-only block-device sda1 (partno 1)
WARNING: CPU: 1 PID: 3123 at block/blk-core.c:701 bio_check_ro block/blk-core.c:701 [inline]
WARNING: CPU: 1 PID: 3123 at block/blk-core.c:701 submit_bio_checks+0x160c/0x1a80 block/blk-core.c:814
Modules linked in:
CPU: 1 PID: 3123 Comm: kworker/u4:6 Not tainted 5.14.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
RIP: 0010:bio_check_ro block/blk-core.c:701 [inline]
RIP: 0010:submit_bio_checks+0x160c/0x1a80 block/blk-core.c:814
Code: 00 00 45 0f b6 a4 24 50 05 00 00 48 8d 74 24 60 48 89 ef e8 76 47 fe ff 48 c7 c7 c0 11 e1 89 48 89 c6 44 89 e2 e8 c8 2b 28 05 <0f> 0b e9 86 f3 ff ff e8 68 ad b4 fd e8 b3 7d 6a 05 31 ff 89 c3 89
RSP: 0018:ffffc90002f17130 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff88801d8cb140 RCX: 0000000000000000
RDX: ffff8880216661c0 RSI: ffffffff815cb9a5 RDI: fffff520005e2e18
RBP: ffff88801beaf080 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815c57ae R11: 0000000000000000 R12: 0000000000000001
R13: ffff88801beaf090 R14: ffff8880204ad000 R15: ffff88801d8cb6b4
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6cfb17b000 CR3: 0000000017123000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 submit_bio_noacct+0x81/0xf20 block/blk-core.c:1029
 submit_bio+0x1ea/0x470 block/blk-core.c:1106
 ext4_io_submit+0x181/0x210 fs/ext4/page-io.c:379
 ext4_writepages+0x1452/0x3ba0 fs/ext4/inode.c:2820
 do_writepages+0xec/0x290 mm/page-writeback.c:2355
 __writeback_single_inode+0x126/0xff0 fs/fs-writeback.c:1613
 writeback_sb_inodes+0x53d/0xf00 fs/fs-writeback.c:1878
 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1947
 wb_writeback+0x814/0xc50 fs/fs-writeback.c:2053
 wb_check_old_data_flush fs/fs-writeback.c:2155 [inline]
 wb_do_writeback fs/fs-writeback.c:2208 [inline]
 wb_workfn+0x8cf/0x12d0 fs/fs-writeback.c:2237
 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	45 0f b6 a4 24 50 05 	movzbl 0x550(%r12),%r12d
   9:	00 00 
   b:	48 8d 74 24 60       	lea    0x60(%rsp),%rsi
  10:	48 89 ef             	mov    %rbp,%rdi
  13:	e8 76 47 fe ff       	callq  0xfffe478e
  18:	48 c7 c7 c0 11 e1 89 	mov    $0xffffffff89e111c0,%rdi
  1f:	48 89 c6             	mov    %rax,%rsi
  22:	44 89 e2             	mov    %r12d,%edx
  25:	e8 c8 2b 28 05       	callq  0x5282bf2
  2a:	0f 0b                	ud2     <-- trapping instruction
  2c:	e9 86 f3 ff ff       	jmpq   0xfffff3b7
  31:	e8 68 ad b4 fd       	callq  0xfdb4ad9e
  36:	e8 b3 7d 6a 05       	callq  0x56a7dee
  3b:	31 ff                	xor    %edi,%edi
  3d:	89 c3                	mov    %eax,%ebx
  3f:	89                   	.byte 0x89