[Bug runtime/2725] Attempting to probe all kernel functions hangs FC5

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

------- Additional Comments From wcohen at redhat dot com  2006-11-17 15:40 -------
Logged into each machine remotely and ran the 20061117 snapshot with the
following script:

  ./stap_testing_200611170930/install/bin/stap -v -p5 -e 'probe
kernel.function("*")  { printf ("%s  %s  %d  %s  ","test-> ", execname(), pid(),
 probefunc() ) }'



fc6 i686 UP
kernel: 2.6.18-1.2849.fc6 #1 SMP Fri Nov 10 12:36:14 EST 2006 i686 i686 i386
GNU/Linux

Got the following output to the console when running the mentioned script:

BUG: unable to handle kernel paging request atf printing eip:
8c60c02f
*pde = 00000000
Oops: 0000 [#1]
BUG: unable to handle kernel paging request at virtual address 8c60c02f
 printing eip:
c0629c0b
*pde = 00000000
Oops: 0000 [#2]
BUG: unable to handle kernel NULL pointer dereference at virtual address 0000000
printing eip:
c0629c0b
*pde = 00000000
Recursive die() failure, output suppressed
 <0>BUG: spinlock lockup on CPU#0, staprun/2683, c066fbac (Not tainted)

Got same output even when printf taken out of script.



rawhide i686 SMP
 2.6.18-1.2849.fc6PAE #1 SMP Fri Nov 10 13:27:10 EST 2006 i686 i686 i386 GNU/Linux

The machine hangs with the script with the printf in the body. No
output or oops or anything However, the following script didn't kill
the machine:

./stap_testing_200611170930/install/bin/stap -v -p5 -e 'probe
kernel.function("*")  { }'

It took significant time for the probes to be removed (about a minute).



rawhide x86-64

Linux dhcp59-198.rdu.redhat.com 2.6.18-1.2849.fc6 #1 SMP Fri Nov 10 12:34:46 EST
2006 x86_64 x86_64 x86_64 GNU/Linux

The machine oops with the printf script. Simplified the script. 
The following script killed the machine by setting off the watchdog timer:

./stap_testing_200611170930/install/bin/stap -v -p5 -e 'probe
kernel.function("*")  { }'
Following transcribed from the screen:

 [<ffffffff802636c0>] do_nmi+0x45/0x63
 [<ffffffff80262bb7>] nmi+0x7f/0x88
 [<ffffffff80262bb8>] nmi+0x80/0x88
 <<EOE>>   [<ffffffff80262bb8>] nmi+0x80/0x88

Kernel panic- not syncing: Aiee, killing interrupt handler!
 Bug: warning at kernel/panic.c:137/panic() (Not tainted)

Call Trace:
 [<ffffffff802691db>] show_trace+0x34/0x47
 [<ffffffff802691e2>] dump_stack+0x12/0x17
 [<ffffffff8028b933>] panic_0x1e3/0x1f4
 [<ffffffff80214ee0>] do_exit+0x8c/0x8c2
 [<ffffffff80262fcb>] sync_regs+0x0/0x67
 [<ffffffff80678290>]
DWARF2 unwinder stuck at 0xffffffff80678290
Leftover inexact backtrace:
 <NMI>  [<ffffffff802635a>] nmi_watchdog_tick+0x105/0x1a6
 [<ffffffff802632f7>] default_do_nmi+0x86/0x1de
 [<ffffffff802636c0>] do_nmi+0x45/0x63
 [<ffffffff80262bb7>] nmi+0x7f/0x88
 [<ffffffff80262bb8>] nmi+0x80/0x88
 <<EOE>>   [<ffffffff80262bb8>] nmi+0x80/0x88




-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=2725

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