#11920: PANIC: Unexpected exception "General Protection Exception" occurred in
kernel mode!
----------------------------------+----------------------------
Reporter: darfo | Owner: nobody
Type: bug | Status: new
Priority: normal | Milestone: Unscheduled
Component: Network & Internet | Version: R1/Development
Resolution: | Keywords: atheroswifi
Blocked By: | Blocking:
Has a Patch: 0 | Platform: x86-64
----------------------------------+----------------------------
Comment (by simonsouth):
From looking at the disassembly it seems the problem happens in
`getchannels` at [http://cgit.haiku-os.org/haiku/tree/src/add-
ons/kernel/drivers/network/wlan/atheroswifi/dev/ath/ath_hal/ah_regdomain.c?id=hrev48926#n549
ath_regdomain.c:549] when the driver tries to zero-out a 16-byte
`ieee80211_channel` structure in the array passed to it:
{{{
OS_MEMZERO(ic, sizeof(*ic));
}}}
The actual exception occurs in `memset_small` at [http://cgit.haiku-
os.org/haiku/tree/src/system/libroot/posix/string/arch/x86_64/arch_string.cpp?id=hrev48926#n188
x86_64/arch_string.cpp:188] when writing to memory, so presumably `ic` is
invalid at this point.
All the code that sets up the channel array seems to be contained in the
driver itself though, and I can't find in
[https://bugs.freebsd.org/bugzilla/query.cgi the FreeBSD bug tracker]
anyone reporting a similar problem on that platform, so the root cause
probably lies in some Haiku-specific code elsewhere.
I'm tempted to finger `memset_small` (especially since the driver works on
other architectures) except [http://cgit.haiku-
os.org/haiku/tree/src/system/libroot/posix/string/arch/x86_64/arch_string.cpp?id=hrev48926#n180
the code is so simple] it's hard to see how there could be a problem with
it.
I'm convinced now this is not a stack-alignment issue (#10509), anyway.
--
Ticket URL: <https://dev.haiku-os.org/ticket/11920#comment:15>
Haiku <https://dev.haiku-os.org>
Haiku - the operating system.
