Hello, syzbot found the following crash on: HEAD commit: 89032636 Add linux-next specific files for 20200708 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=15c4af2f100000 kernel config: https://syzkaller.appspot.com/x/.config?x=64a250ebabc6c320 dashboard link: https://syzkaller.appspot.com/bug?extid=e6f77e16ff68b2434a2c compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15898b97100000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14463a47100000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+e6f77e16ff68b2434a2c@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 0 PID: 12 at fs/read_write.c:528 __kernel_write+0x828/0x9b0 fs/read_write.c:528 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.8.0-rc4-next-20200708-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+0x828/0x9b0 fs/read_write.c:528 Code: 01 89 c6 89 04 24 e8 d7 90 b5 ff 8b 04 24 85 c0 0f 84 c7 fa ff ff e9 b9 fa ff ff e8 42 94 b5 ff e9 e9 fe ff ff e8 38 94 b5 ff <0f> 0b 49 c7 c5 f7 ff ff ff e9 0e ff ff ff 4c 89 f7 e8 d2 48 f5 ff RSP: 0018:ffffc90000d2fb18 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 1ffff920001a5f67 RCX: ffffffff81be629e RDX: ffff8880a95f4300 RSI: ffffffff81be69f8 RDI: 0000000000000005 RBP: ffff888094301158 R08: 0000000000000001 R09: ffff8880a95f4bd0 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888094301040 R13: 0000000000000000 R14: ffff8880943010c4 R15: 0000000000080001 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.. --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
