------------[ cut here ]------------
generic_make_request: Trying to write to read-only block-device sda1 (partno 1)
WARNING: CPU: 1 PID: 3021 at block/blk-core.c:2182 bio_check_ro block/blk-core.c:2182 [inline]
WARNING: CPU: 1 PID: 3021 at block/blk-core.c:2182 blk_partition_remap block/blk-core.c:2233 [inline]
WARNING: CPU: 1 PID: 3021 at block/blk-core.c:2182 generic_make_request_checks+0x20c7/0x2420 block/blk-core.c:2284
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3021 Comm: kworker/u4:5 Not tainted 4.19.150-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+0x22c/0x33e lib/dump_stack.c:118
 panic+0x2ac/0x565 kernel/panic.c:186
 __warn.cold+0x20/0x5a 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+0x1e1/0x330 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:blk_partition_remap block/blk-core.c:2233 [inline]
RIP: 0010:generic_make_request_checks+0x20c7/0x2420 block/blk-core.c:2284
Code: fe 01 00 00 45 8b be 9c 04 00 00 48 8d 74 24 70 48 89 ef e8 5b 82 06 00 48 c7 c7 00 1e 50 88 48 89 c6 44 89 fa e8 bf a1 b7 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 10 48 c1 ea 03 0f
RSP: 0018:ffff88809d6f7198 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8880a2813080 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815b623f RDI: ffffed1013adee25
RBP: ffff88808f395300 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88808f395308 R14: ffff88809d62ed80 R15: 0000000000000001
 generic_make_request+0x279/0xe40 block/blk-core.c:2411
 submit_bio+0xb1/0x480 block/blk-core.c:2575
 ext4_io_submit+0x181/0x210 fs/ext4/page-io.c:356
 ext4_writepages+0x1841/0x3a90 fs/ext4/inode.c:2902
 do_writepages+0xe5/0x290 mm/page-writeback.c:2344
 __writeback_single_inode+0x113/0x13e0 fs/fs-writeback.c:1382
 writeback_sb_inodes+0x537/0xf10 fs/fs-writeback.c:1646
 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1715
 wb_writeback+0x841/0xd20 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+0x924/0x1230 fs/fs-writeback.c:2005
 process_one_work+0x796/0x14e0 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..