------------[ cut here ]------------ generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) WARNING: CPU: 0 PID: 29560 at block/blk-core.c:852 bio_check_ro block/blk-core.c:852 [inline] WARNING: CPU: 0 PID: 29560 at block/blk-core.c:852 generic_make_request_checks+0x1cb0/0x21c0 block/blk-core.c:988 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 29560 Comm: kworker/u4:2 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-250:0) Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:231 __warn.cold+0x20/0x45 kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:235 exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:540 RIP: 0010:bio_check_ro block/blk-core.c:852 [inline] RIP: 0010:generic_make_request_checks+0x1cb0/0x21c0 block/blk-core.c:988 Code: 1a 05 00 00 44 8b ab ac 05 00 00 48 8d 74 24 70 48 89 ef e8 92 0f fe ff 48 c7 c7 e0 9b 91 88 48 89 c6 44 89 ea e8 92 72 c2 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 RSP: 0018:ffffc9001739f0a8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff8880a0d15000 RCX: 0000000000000000 RDX: ffff8880a28561c0 RSI: ffffffff815d4ef7 RDI: fffff52002e73e07 RBP: ffff888024447dc0 R08: 0000000000000001 R09: ffff8880ae6318e7 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888024447dc8 R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a0d10080 generic_make_request+0x89/0xc00 block/blk-core.c:1112 submit_bio+0x263/0x5b0 block/blk-core.c:1275 submit_bh_wbc+0x68d/0x8e0 fs/buffer.c:3073 __block_write_full_page+0x837/0x12e0 fs/buffer.c:1811 block_write_full_page+0x214/0x270 fs/buffer.c:2997 __writepage+0x60/0x170 mm/page-writeback.c:2313 write_cache_pages+0x736/0x11b0 mm/page-writeback.c:2248 generic_writepages mm/page-writeback.c:2339 [inline] generic_writepages+0xe2/0x150 mm/page-writeback.c:2328 do_writepages+0xec/0x290 mm/page-writeback.c:2354 __writeback_single_inode+0x125/0x13e0 fs/fs-writeback.c:1452 writeback_sb_inodes+0x5aa/0x1410 fs/fs-writeback.c:1716 __writeback_inodes_wb+0xc6/0x350 fs/fs-writeback.c:1785 wb_writeback+0x8ba/0xd40 fs/fs-writeback.c:1894 wb_check_old_data_flush fs/fs-writeback.c:1996 [inline] wb_do_writeback fs/fs-writeback.c:2049 [inline] wb_workfn+0x8c6/0x12a0 fs/fs-writeback.c:2078 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Kernel Offset: disabled Rebooting in 86400 seconds..