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Date:   Thu, 30 Aug 2018 08:31:02 -0700
From:   syzbot <>
Subject: WARNING in handle_irq (3)


syzbot found the following crash on:

HEAD commit:    58c3f14f86c9 Merge tag 'riscv-for-linus-4.19-rc2' of git:/..
git tree:       upstream
console output:
kernel config:
dashboard link:
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:

TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending  
cookies.  Check SNMP counters.
------------[ cut here ]------------
do_IRQ(): syz-executor5 has overflown the kernel stack  
(cur:ffff88018aec0000,sp:ffff88018aeb0e18,irq stk  
top-bottom:ffff8801db000080-ffff8801db008000,exception stk  
WARNING: CPU: 0 PID: 13805 at arch/x86/kernel/irq_64.c:64  
stack_overflow_check arch/x86/kernel/irq_64.c:61 [inline]
WARNING: CPU: 0 PID: 13805 at arch/x86/kernel/irq_64.c:64  
handle_irq+0x1fb/0x2e7 arch/x86/kernel/irq_64.c:73
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 13805 Comm: syz-executor5 Not tainted 4.19.0-rc1+ #215
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+0x1c9/0x2b4 lib/dump_stack.c:113
  panic+0x238/0x4e7 kernel/panic.c:184
  __warn.cold.8+0x163/0x1ba kernel/panic.c:536
  report_bug+0x252/0x2d0 lib/bug.c:186
  fixup_bug arch/x86/kernel/traps.c:178 [inline]
  do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
  invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:993
RIP: 0010:stack_overflow_check arch/x86/kernel/irq_64.c:61 [inline]
RIP: 0010:handle_irq+0x1fb/0x2e7 arch/x86/kernel/irq_64.c:73
Code: 00 00 ff b6 80 00 00 00 48 c7 c7 80 ca 24 87 41 54 41 55 65 48 8b 04  
25 40 ee 01 00 48 05 68 06 00 00 48 89 c6 e8 95 c4 1c 00 <0f> 0b 48 83 c4  
18 e9 3f ff ff ff 48 89 75 e0 e8 c1 fe 90 00 48 8b
RSP: 0018:ffff8801db007f58 EFLAGS: 00010082
RAX: 0000000000000000 RBX: ffff8801cee0ad80 RCX: 0000000000000000
RDX: 0000000000010000 RSI: ffffffff8163ac01 RDI: 0000000000000001
RBP: ffff8801db007fb0 R08: ffff8801c9b4a700 R09: ffffed003b603eca
R10: ffffed003b603eca R11: ffff8801db01f657 R12: fffffe0000011000
R13: fffffe0000007080 R14: 000000000000002a R15: 0000000000000000
  do_IRQ+0x80/0x1a0 arch/x86/kernel/irq.c:246
  common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:643
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

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