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Trying to write to read-only block-device sda1 (partno 1)
WARNING: CPU: 1 PID: 515 at block/blk-core.c:704 bio_check_ro block/blk-core.c:704 [inline]
WARNING: CPU: 1 PID: 515 at block/blk-core.c:704 submit_bio_checks+0x165c/0x1aa0 block/blk-core.c:817
Modules linked in:
CPU: 0 PID: 515 Comm: kworker/u4:7 Not tainted 5.13.0-rc7-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:704 [inline]
RIP: 0010:submit_bio_checks+0x165c/0x1aa0 block/blk-core.c:817
Code: 00 00 45 0f b6 a4 24 e0 05 00 00 48 8d 74 24 60 48 89 ef e8 76 42 fe ff 48 c7 c7 a0 d9 c0 89 48 89 c6 44 89 e2 e8 3f 34 1c 05 <0f> 0b e9 36 f3 ff ff e8 e8 8f bb fd 0f 0b e9 bf f1 ff ff e8 dc 8f
RSP: 0018:ffffc90002abf0d0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888145fa1bc0 RCX: 0000000000000000
RDX: ffff888016aad4c0 RSI: ffffffff815ce185 RDI: fffff52000557e0c
RBP: ffff8880220f4c80 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815c7fee R11: 0000000000000000 R12: 0000000000000001
R13: ffff8880220f4c90 R14: ffff88823bc44000 R15: ffff888145fa20c4
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055665e848928 CR3: 000000002027e000 CR4: 0000000000350ef0
Call Trace:
 submit_bio_noacct+0x81/0xf20 block/blk-core.c:1032
 submit_bio+0x263/0x5e0 block/blk-core.c:1118
 ext4_io_submit+0x181/0x210 fs/ext4/page-io.c:379
 ext4_writepages+0x1370/0x3b70 fs/ext4/inode.c:2820
 do_writepages+0xec/0x290 mm/page-writeback.c:2352
 __writeback_single_inode+0x126/0xfd0 fs/fs-writeback.c:1467
 writeback_sb_inodes+0x53d/0xef0 fs/fs-writeback.c:1732
 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1801
 wb_writeback+0x814/0xc40 fs/fs-writeback.c:1907
 wb_check_old_data_flush fs/fs-writeback.c:2009 [inline]
 wb_do_writeback fs/fs-writeback.c:2062 [inline]
 wb_workfn+0x891/0x12d0 fs/fs-writeback.c:2091
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2276
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2422
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294