[Bug kprobes/4420] New: systemtap.samples/lket.exp test crashing RHEL4U4 machine

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

Looking at why RHEL4U4 i686 machine (2.6.9-42.0.10.EL i686 kernel) is
dying during the snapshot testing. Some of the kernel error message
looks similar to an earlier closed bug, 2726. However, the tests from
2726 works. Need to narrow down the problem more. Looking through the
systemtap.log for the testsuite the test that is crashing the machine is:

Running
/home/wcohen/stap_testing_200704240830/src/testsuite/systemtap.samples/lket.exp ...

from systemtap.log

Running
/home/wcohen/stap_testing_200704240830/src/testsuite/systemtap.samples/lket.exp ...
Pass 1: parsed user script and 54 library script(s) in 740usr/30sys/805real ms.

Pass 2: analyzed script: 857 probe(s), 310 function(s), 24 embed(s), 132
global(s) in 70000usr/170sys/70548real ms.

Pass 3: translated to C into
"/tmp/stapfJv2vF/stap_997dc0e24dfee70b8a1d0811d8a016a9_641435.c" in
810usr/20sys/832real ms.


Taking a look at the directory:

$ ls -l /tmp/stapfJv2vF/
total 9656
-rw-r--r--  1 wcohen wcohen     795 Apr 24 04:58 Makefile
-rw-r--r--  1 wcohen wcohen 4378845 Apr 24 04:58
stap_997dc0e24dfee70b8a1d0811d8a016a9_641435.c
-rw-r--r--  1 wcohen wcohen 2722463 Apr 24 04:59
stap_997dc0e24dfee70b8a1d0811d8a016a9_641435.ko
-rw-r--r--  1 wcohen wcohen    3067 Apr 24 04:59
stap_997dc0e24dfee70b8a1d0811d8a016a9_641435.mod.c
-rw-r--r--  1 wcohen wcohen   34604 Apr 24 04:59
stap_997dc0e24dfee70b8a1d0811d8a016a9_641435.mod.o
-rw-r--r--  1 wcohen wcohen 2688948 Apr 24 04:59
stap_997dc0e24dfee70b8a1d0811d8a016a9_641435.o

Pretty big module. The following caused the kernel to crash:

 sudo /home/wcohen/stap_testing_200704240830/install/bin/staprun
/tmp/stapfJv2vF/stap_997dc0e24dfee70b8a1d0811d8a016a9_641435.ko


Oops output on console.



slingshot.devel.redhat.com login: Kernel panic - not syncing: kernel/module.c:24
<0>Kernel panic - not syncing: kernel/sched.c:2430: spin_lock(kernel/sched.c:c5
Badness in panic at kernel/panic.c:118                                         
 [<c0123ea0>] panic+0x135/0x142
 [<c011fdbc>] scheduler_tick+0x21d/0x4aa
 [<c012e6a3>] do_timer+0x29/0xb5
 [<c010d080>] timer_interrupt+0x165/0x25a
 [<c0107f00>] handle_IRQ_event+0x25/0x4f
 [<c01088ce>] do_IRQ+0x18a/0x2bf
 =======================
 [<c01e7149>] search_extable+0x1f/0x36
 [<c03198c4>] common_interrupt+0x18/0x20
 [<c01e7149>] search_extable+0x1f/0x36
 [<c0123e5a>] panic+0xef/0x142
 [<c01e7149>] search_extable+0x1f/0x36
 [<c0141690>] search_module_extables+0x6d/0x13b
 [<c01e7149>] search_extable+0x1f/0x36
 [<c0139dcb>] search_exception_tables+0x1f/0x21
 [<c011e1d3>] fixup_exception+0xb/0x20
 [<c011c300>] kprobe_exceptions_notify+0x187/0x19b
 [<c01348a1>] notifier_call_chain+0x17/0x2e
 [<c011d7d9>] do_page_fault+0x0/0x4dc
 [<c011d82b>] do_page_fault+0x52/0x4dc
 [<c0317627>] __cond_resched+0x14/0x3b
 [<c016f41e>] __getblk+0x2b/0x49
 [<e0822903>] ext3_get_inode_loc+0x4f/0x223 [ext3]
 [<c01089f7>] do_IRQ+0x2b3/0x2bf
 [<c03198c4>] common_interrupt+0x18/0x20
 [<c011d7d9>] do_page_fault+0x0/0x4dc
 [<c0319983>] error_code+0x2f/0x38
 [<e0dab333>]<0>Kernel panic - not syncing: kernel/module.c:2114: spin_lock(ker4

-- 
           Summary: systemtap.samples/lket.exp test crashing RHEL4U4 machine
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: critical
          Priority: P2
         Component: kprobes
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: wcohen at redhat dot com
GCC target triplet: i386-linux


http://sourceware.org/bugzilla/show_bug.cgi?id=4420

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