[Bug runtime/31472] systemtap.base/tracepoints.stp causes reboot with RHEL9 linux 5.14.0-428.el9.x86_64

["wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31472

William Cohen <wcohen at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #2 from William Cohen <wcohen at redhat dot com> ---
The following message appears to be saying it is attempting to put in a jump
patch on the tracepoint module which is very odd (it should be trying to
instrument itself):

[ 6315.911726] jump_label: Fatal kernel bug, unexpected op at
__access_process_vm_.constprop.0+0x3d/0x1f0 [tracepoints] [0000000071a5b3f1]
(e9 eb 00 00 00 != 0f 1f 44 00 00)) size:5 type:1

The kernel checks to determine whether the location is a valid location for a
jump patch if it doesn't match the expected form the following line prints out
the message followed by a BUG() which cause the reboot:

https://elixir.bootlin.com/linux/v5.14/source/arch/x86/kernel/jump_label.c#L71

There seems to be something that is triggering this due to the number of
tracepoints being instrumented.  The RHEL 427 kernel only list out 21
tracepoints which the 428 kernel that has a problem with the tracepoints.stp
test has 2173 tracepoints listed.  Playing around with the list of tracepoints
in all_tracepoint to see see if can get a smaller set tracepoints that trigger
the reboot.

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