------------[ cut here ]------------
WARNING: CPU: 0 PID: 13253 at fs/read_write.c:528 __kernel_write+0x84e/0x9e0 fs/read_write.c:528
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 13253 Comm: kworker/0:6 Not tainted 5.8.0-rc5-next-20200716-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_write_work
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:234
 exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:542
RIP: 0010:__kernel_write+0x84e/0x9e0 fs/read_write.c:528
Code: 01 89 c6 89 04 24 e8 61 83 b5 ff 8b 04 24 85 c0 0f 84 a1 fa ff ff e9 93 fa ff ff e8 cc 86 b5 ff e9 e1 fd ff ff e8 c2 86 b5 ff <0f> 0b 49 c7 c5 f7 ff ff ff e9 06 fe ff ff 4c 89 f7 e8 cc 33 f5 ff
RSP: 0018:ffffc9001756fb18 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff92002eadf67 RCX: ffffffff81bea19e
RDX: ffff8880a6c18380 RSI: ffffffff81bea91e RDI: 0000000000000005
RBP: ffff8880a1eb1418 R08: 0000000000000001 R09: ffffffff8c7cdcdf
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a1eb1300
R13: 0000000000000000 R14: ffff8880a1eb1384 R15: 00000000080a801d
 kernel_write fs/read_write.c:569 [inline]
 kernel_write+0xe2/0x200 fs/read_write.c:559
 p9_fd_write net/9p/trans_fd.c:424 [inline]
 p9_write_work+0x25e/0xca0 net/9p/trans_fd.c:475
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Kernel Offset: disabled
Rebooting in 86400 seconds..