------------[ cut here ]------------ generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) WARNING: CPU: 1 PID: 6929 at block/blk-core.c:829 bio_check_ro block/blk-core.c:829 [inline] WARNING: CPU: 1 PID: 6929 at block/blk-core.c:829 generic_make_request_checks+0x1c78/0x2190 block/blk-core.c:930 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 6929 Comm: syz-executor.3 Not tainted 5.4.0-rc8-next-20191120-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x35 kernel/panic.c:582 report_bug+0x289/0x300 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] fixup_bug arch/x86/kernel/traps.c:169 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:bio_check_ro block/blk-core.c:829 [inline] RIP: 0010:generic_make_request_checks+0x1c78/0x2190 block/blk-core.c:930 Code: 00 00 44 8b ab 5c 05 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 7a 85 05 00 48 c7 c7 80 93 e5 87 48 89 c6 44 89 ea e8 20 33 11 fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 RSP: 0018:ffff888091cf71c0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff8880a33d7000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815d8d06 RDI: ffffed101239ee2a RBP: ffff888091cf72c0 R08: ffff8880582ea2c0 R09: ffffed1015d26621 R10: ffffed1015d26620 R11: ffff8880ae933107 R12: ffff88809c653c08 R13: 0000000000000000 R14: 0000000000000001 R15: ffff88809c653c00 generic_make_request+0x8f/0xb00 block/blk-core.c:1049 submit_bio+0x113/0x600 block/blk-core.c:1221 submit_bh_wbc+0x6b6/0x900 fs/buffer.c:3172 __block_write_full_page+0x7fe/0x11b0 fs/buffer.c:1844 block_write_full_page+0x21f/0x270 fs/buffer.c:3030 blkdev_writepage+0x25/0x30 fs/block_dev.c:609 __writepage+0x66/0x110 mm/page-writeback.c:2303 write_cache_pages+0x80c/0x13f0 mm/page-writeback.c:2238 generic_writepages mm/page-writeback.c:2329 [inline] generic_writepages+0xed/0x160 mm/page-writeback.c:2318 blkdev_writepages+0x1e/0x30 fs/block_dev.c:2060 do_writepages+0xfa/0x2a0 mm/page-writeback.c:2344 __filemap_fdatawrite_range+0x2bc/0x3b0 mm/filemap.c:421 __filemap_fdatawrite mm/filemap.c:429 [inline] filemap_fdatawrite mm/filemap.c:434 [inline] filemap_write_and_wait mm/filemap.c:640 [inline] filemap_write_and_wait+0xf8/0x1e0 mm/filemap.c:635 __sync_blockdev fs/block_dev.c:491 [inline] sync_blockdev fs/block_dev.c:500 [inline] __blkdev_put+0x204/0x810 fs/block_dev.c:1889 blkdev_put+0x98/0x560 fs/block_dev.c:1958 blkdev_close+0x8b/0xb0 fs/block_dev.c:1965 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x8e7/0x2e00 kernel/exit.c:797 do_group_exit+0x135/0x360 kernel/exit.c:895 __do_sys_exit_group kernel/exit.c:906 [inline] __se_sys_exit_group kernel/exit.c:904 [inline] __x64_sys_exit_group+0x44/0x50 kernel/exit.c:904 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a639 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffdb50cbc38 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 000000000045a639 RDX: 00000000004141d1 RSI: fffffffffffffff7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffff R09: 00007ffdb50cbc90 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffdb50cbc90 R14: 0000000000000000 R15: 00007ffdb50cbca0 Kernel Offset: disabled Rebooting in 86400 seconds..