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SubjectSpurious Fatal exception in interrupt, 4.1.43

Let me report a difficulty with the Linux kernel -- unknown root cause.
Basically, this is a FYI message, unless someone sees appropriate to
investigate -- thanks in advance.

This is an on-line server with services like DNS, postfix mail, Apache,
local wifi, IP forwarding. No GUI. Distribution is Crux, which means a
customized installation (e.g. kernel manually configured).

The system ran for two years without significant problems (except for an
episode of instability in disk access). Then it started to crash about
two months ago and does so once or twice a week. Difficult to pinpoint
any environmental factor from the occurrence pattern.

Here is the trace I get from the console.

Code: ff e0 0f 1f 80 00 00 00 00 48 8b 5f 50 89 74 24 0c e8 c3 fc ff ff
8b 74 24 84 00 00 00 00 00 f0 ff 47 44 e9 57 ff
RIP [<ffffffff8137dd62>] bio_endio+0x92/0xa0
RSP <ffff88021ea03dc8>
---[ end trace b293c5209809c889 ]---
Kernel panic - not syncing: Fatal exception in interrupt
Kernel Offset: disabled
---[ end Kernel panic - not syncing: Fatal exception in interrupt

I upgraded the kernel from 4.1.3 to 4.1.43 and got exactly the same
trace after a few days of up-time.

Here are some options I see for the next step:

(A) Upgrade once more to 4.4.x, 4.9.x, or 4.12.x (or 4.13).

(B) Investigate kernel configuration for reliability-impacting options.

(C) Review the system BIOS configuration (e.g. under the hypothesis that
interrupt processing calls for a special memory/cache access cycle that
is borderline with the current BIOS confguration).

(D) Remove the wifi service (the only "option" from an operational

(E) Provision a replacement system and remove other services in order to
isolate environmental factors (likely to confirm that a useless system
is working fine generally!).

(F) Give up with this hardware (and thus deprive the Linux community
from possible improvement if some kernel issue was to be identified in
troubleshooting ???).

Any suggestion?

- Thierry Moreau

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