From: "Theodore Ts'o" <tytso@mit.edu>
To: systemtap@sourceware.org
Subject: How to debug what I am doing wrong?
Date: Thu, 17 Jul 2008 21:30:00 -0000 [thread overview]
Message-ID: <E1KJb3E-0002qe-Ey@closure.thunk.org> (raw)
I'm trying to run this systemtap script, ext4_check_desc.stp:
probe module("ext4dev").function("ext4_check_descriptors")
{
printf("ext4_check_descriptors: flags %x\n", $sb->s_flags);
}
<tytso@closure> {/usr/projects/systemtap/examples}
4% stap ext4-check-desk.stp
WARNING: cannot find module ext4dev debuginfo: No such file or directory
semantic error: no match while resolving probe point module("ext4dev").function("ext4_check_descriptors")
semantic error: no probes found
Pass 2: analysis failed. Try again with more '-v' (verbose) options.
<tytso@closure> {/usr/projects/systemtap/examples}
5% uname -a
Linux closure 2.6.26-03033-g97438cf #16 SMP Thu Jul 17 01:21:12 EDT 2008 i686 GNU/Linux
<tytso@closure> {/usr/projects/systemtap/examples}
6% ls /usr/lib/debug/lib/modules/2.6.26-03033-g97438cf/kernel/fs/ext4/ext4dev.ko
3428 /usr/lib/debug/lib/modules/2.6.26-03033-g97438cf/kernel/fs/ext4/ext4dev.ko
<tytso@closure> {/usr/projects/systemtap/examples}
7% stap -V
SystemTap translator/driver (version 0.7.1/0.131 git branch master, commit 82737bef)
Copyright (C) 2005-2008 Red Hat, Inc. and others
This is free software; see the source for copying conditions.
<tytso@closure> {/usr/projects/systemtap/examples}
8% stap -vvv ext4-check-desk.stp
SystemTap translator/driver (version 0.7.1/0.131 git branch master, commit 82737bef)
Copyright (C) 2005-2008 Red Hat, Inc. and others
This is free software; see the source for copying conditions.
Session arch: i686 release: 2.6.26-03033-g97438cf
Created temporary directory "/tmp/stapfX7KWk"
Searched '/usr/local/share/systemtap/tapset/i686/*.stp', found 2
Searched '/usr/local/share/systemtap/tapset/*.stp', found 41
Pass 1: parsed user script and 43 library script(s) in 360usr/10sys/725real ms.
control symbols: kts: 0xc02f6e60 kte: 0xc02f9f02 stext: 0xc01010e8
parsed 'ext4_check_descriptors' -> func 'ext4_check_descriptors'
blacklist regexps:
blfn: ^(atomic_notifier_call_chain|default_do_nmi|__die|die_nmi|do_debug|do_general_protection|do_int3|do_IRQ|do_page_fault|do_sparc64_fault|do_trap|dummy_nmi_callback|flush_icache_range|ia64_bad_break|ia64_do_page_fault|ia64_fault|io_check_error|mem_parity_error|nmi_watchdog_tick|notifier_call_chain|oops_begin|oops_end|program_check_exception|single_step_exception|sync_regs|unhandled_fault|unknown_nmi_error|.*raw_.*lock.*|.*read_.*lock.*|.*write_.*lock.*|.*spin_.*lock.*|.*rwlock_.*lock.*|.*rwsem_.*lock.*|.*mutex_.*lock.*|raw_.*|.*seq_.*lock.*|atomic_.*|atomic64_.*|get_bh|put_bh|.*apic.*|.*APIC.*|.*softirq.*|.*IRQ.*|.*_intr.*|__delay|.*kernel_text.*|get_current|current_.*|.*exception_tables.*|.*setup_rt_frame.*|.*preempt_count.*|preempt_schedule)$
blfn_ret: ^(do_exit|sys_exit|sys_exit_group|__switch_to)$
blfile: ^(kernel/kprobes.c|arch/.*/kernel/kprobes.c)$
focused on module 'ext4dev = [0x9aa300-0x9d9888, bias 0x0] file /lib/modules/2.6.26-03033-g97438cf/kernel/fs/ext4/ext4dev.ko ELF machine i?86 (code 3)
WARNING: cannot find module ext4dev debuginfo: No such file or directory
semantic error: no match while resolving probe point module("ext4dev").function("ext4_check_descriptors")
semantic error: no probes found
Pass 2: analyzed script: 0 probe(s), 0 function(s), 0 embed(s), 0 global(s) in 1970usr/170sys/5974real ms.
Pass 2: analysis failed. Try again with more '-v' (verbose) options.
Running rm -rf /tmp/stapfX7KWk
<tytso@closure> {/usr/projects/systemtap/examples}
9% grep DEBUG_KERNEL /boot/config-2.6.26-03033-g97438cf
CONFIG_DEBUG_KERNEL=y
So, what I am doing wrong? And how am I supposed to figure this what I
should have done to allow systemtap to work correctly?
- Ted
next reply other threads:[~2008-07-17 21:30 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-17 21:30 Theodore Ts'o [this message]
-- strict thread matches above, loose matches on Subject: below --
2008-07-17 21:02 Theodore Ts'o
2008-07-17 21:31 ` Masami Hiramatsu
2008-07-17 22:07 ` Theodore Tso
2008-07-17 22:01 ` Roland McGrath
2008-07-17 22:10 ` Theodore Tso
2008-07-17 22:23 ` Roland McGrath
2008-07-17 22:38 ` Theodore Tso
2008-07-17 23:01 ` Frank Ch. Eigler
2008-07-18 11:50 ` Theodore Tso
2008-07-18 12:13 ` Frank Ch. Eigler
2008-07-18 0:15 ` Roland McGrath
2008-07-18 1:14 ` Theodore Tso
2008-07-18 2:07 ` Roland McGrath
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