------------[ cut here ]------------
generic_make_request: Trying to write to read-only block-device sda1 (partno 1)
WARNING: CPU: 1 PID: 359 at block/blk-core.c:2183 bio_check_ro block/blk-core.c:2183 [inline]
WARNING: CPU: 1 PID: 359 at block/blk-core.c:2183 blk_partition_remap block/blk-core.c:2234 [inline]
WARNING: CPU: 1 PID: 359 at block/blk-core.c:2183 generic_make_request_checks+0x1f9b/0x22e0 block/blk-core.c:2285
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 359 Comm: kworker/u4:3 Not tainted 4.19.204-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/0x2ef lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x5a kernel/panic.c:541
 report_bug+0x262/0x2b0 lib/bug.c:183
 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:2183 [inline]
RIP: 0010:blk_partition_remap block/blk-core.c:2234 [inline]
RIP: 0010:generic_make_request_checks+0x1f9b/0x22e0 block/blk-core.c:2285
Code: 2c 03 00 00 45 8b be 9c 04 00 00 48 8d 74 24 68 48 89 ef e8 f7 0c 06 00 48 c7 c7 00 28 b2 88 48 89 c6 44 89 fa e8 45 56 91 04 <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 0f b6 04
RSP: 0018:ffff8880b4f37170 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8880ac26e000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff814e0d61 RDI: ffffed10169e6e20
RBP: ffff8880b25202c0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880b25202f0
R13: ffff8880b25202c8 R14: ffff8880a8838480 R15: 0000000000000001
 generic_make_request+0x23f/0xdf0 block/blk-core.c:2412
 submit_bio+0xb1/0x430 block/blk-core.c:2576
 submit_bh_wbc+0x5a7/0x760 fs/buffer.c:3090
 __block_write_full_page+0x71a/0xf60 fs/buffer.c:1777
 block_write_full_page+0x1f3/0x260 fs/buffer.c:2951
 __writepage+0x5e/0xe0 mm/page-writeback.c:2305
 write_cache_pages+0x802/0x12d0 mm/page-writeback.c:2240
 generic_writepages mm/page-writeback.c:2329 [inline]
 generic_writepages+0xdb/0x150 mm/page-writeback.c:2318
 do_writepages+0xe5/0x290 mm/page-writeback.c:2344
 __writeback_single_inode+0x10c/0x11d0 fs/fs-writeback.c:1385
 writeback_sb_inodes+0x537/0xef0 fs/fs-writeback.c:1647
 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1716
 wb_writeback+0x841/0xcc0 fs/fs-writeback.c:1822
 wb_check_old_data_flush fs/fs-writeback.c:1924 [inline]
 wb_do_writeback fs/fs-writeback.c:1977 [inline]
 wb_workfn+0x8ba/0x1250 fs/fs-writeback.c:2006
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 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..
----------------
Code disassembly (best guess):
   0:	2c 03                	sub    $0x3,%al
   2:	00 00                	add    %al,(%rax)
   4:	45 8b be 9c 04 00 00 	mov    0x49c(%r14),%r15d
   b:	48 8d 74 24 68       	lea    0x68(%rsp),%rsi
  10:	48 89 ef             	mov    %rbp,%rdi
  13:	e8 f7 0c 06 00       	callq  0x60d0f
  18:	48 c7 c7 00 28 b2 88 	mov    $0xffffffff88b22800,%rdi
  1f:	48 89 c6             	mov    %rax,%rsi
  22:	44 89 fa             	mov    %r15d,%edx
  25:	e8 45 56 91 04       	callq  0x491566f
  2a:	0f 0b                	ud2     <-- trapping instruction
  2c:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  33:	fc ff df 
  36:	4c 89 e2             	mov    %r12,%rdx
  39:	48 c1 ea 03          	shr    $0x3,%rdx
  3d:	0f                   	.byte 0xf
  3e:	b6 04                	mov    $0x4,%dh