Your message dated Mon, 30 May 2022 10:41:33 +0200
with message-id <[email protected]>
and subject line Re: Bug#1010890: Segfault with "bpftrace -l '*mount*'"
has caused the Debian Bug report #1010890,
regarding Segfault with "bpftrace -l '*mount*'"
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
1010890: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1010890
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: bpftrace
Version: 0.14.1-5
Severity: important
X-Debbugs-Cc: [email protected]
Listing probes is not possible:
# LC_ALL=C gdb --args bpftrace -l '*mount*'
...
Program received signal SIGSEGV, Segmentation fault.
__strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:74
Download failed: Invalid argument. Continuing without source file
./string/../sysdeps/x86_64/multiarch/strlen-avx2.S.
74 ../sysdeps/x86_64/multiarch/strlen-avx2.S: No such file or
directory.
(gdb) bt
#0 __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:74
#1 0x00007fffef938618 in __vfprintf_internal (s=s@entry=0x7fffffff98a0,
format=0x7ffff7f84457 "libbpf: loading %s\n", ap=0x7fffffffb9e0, mode_flags=2)
at vfprintf-internal.c:1647
#2 0x00007fffef938dc4 in buffered_vfprintf (s=0x7fffefa9f5e0
<_IO_2_1_stderr_>, format=<optimized out>, args=<optimized out>,
mode_flags=<optimized out>) at vfprintf-internal.c:2295
#3 0x00007ffff7f5b1bb in ?? () from /lib/x86_64-linux-gnu/libbpf.so.0
#4 0x00007ffff7f677c2 in ?? () from /lib/x86_64-linux-gnu/libbpf.so.0
#5 0x00007ffff7f6ec1d in bpf_prog_load_xattr () from
/lib/x86_64-linux-gnu/libbpf.so.0
#6 0x00007ffff7f6ee13 in bpf_prog_load_deprecated () from
/lib/x86_64-linux-gnu/libbpf.so.0
#7 0x00007ffff7dc0e17 in libbpf_bpf_prog_load () from
/usr/local/lib/libbcc_bpf.so.0
#8 0x00007ffff7dc2329 in bcc_prog_load_xattr () from
/usr/local/lib/libbcc_bpf.so.0
#9 0x00007ffff7dc2b7a in bcc_prog_load () from
/usr/local/lib/libbcc_bpf.so.0
#10 0x00005555555e4295 in ?? ()
#11 0x00005555555e4b41 in ?? ()
#12 0x00005555555e4cc7 in ?? ()
#13 0x0000555555686140 in ?? ()
#14 0x0000555555686911 in ?? ()
#15 0x0000555555678090 in ?? ()
#16 0x00005555556795eb in ?? ()
#17 0x000055555558c32b in ?? ()
#18 0x00007fffef8f37fd in __libc_start_main (main=0x55555558a580, argc=3,
argv=0x7fffffffec68, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fffffffec58) at ../csu/libc-start.c:332
#19 0x00005555555b11fa in ?? ()
That makes it quite hard to use.
Can't even be used, I believe:
# bpftrace -e 'tracepoint:syscalls:sys_enter_mount { ustack(); } '
Attaching 1 probe...
Segmentation fault
A locally recompiled bpftrace (38c099dff9100bafeaaa7cee865f4dfda58134ac)
works as expected.
-- System Information:
Debian Release: bookworm/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable-debug'), (500,
'testing-debug'), (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 5.17.0-1-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=de_AT.UTF-8, LC_CTYPE=de_AT.UTF-8 (charmap=UTF-8),
LANGUAGE=de_AT:de
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages bpftrace depends on:
ii libbpf0 1:0.7.0-2
ii libbpfcc 0.24.0+ds-1
ii libc6 2.33-7
ii libclang1-13 1:13.0.1-3+b2
ii libdw1 0.187-1
ii libgcc-s1 12.1.0-1
ii libllvm13 1:13.0.1-3+b2
ii libstdc++6 12.1.0-1
bpftrace recommends no packages.
bpftrace suggests no packages.
-- no debconf information
-- debsums errors found:
debsums: can't check bpftrace file /usr/share/doc/bpftrace/changelog.Debian.gz
(Wide character in subroutine entry)
debsums: can't check bpftrace file /usr/share/doc/bpftrace/changelog.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file
/usr/share/doc/bpftrace/examples/cpuwalk_example.txt.gz (Wide character in
subroutine entry)
debsums: can't check bpftrace file
/usr/share/doc/bpftrace/examples/dcsnoop_example.txt.gz (Wide character in
subroutine entry)
debsums: can't check bpftrace file
/usr/share/doc/bpftrace/examples/runqlat_example.txt.gz (Wide character in
subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/bashreadline.bt.8.gz
(Wide character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/biolatency.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/biosnoop.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/biostacks.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/bitesize.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/bpftrace.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/capable.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/cpuwalk.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/dcsnoop.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/execsnoop.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/gethostlatency.bt.8.gz
(Wide character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/killsnoop.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/loads.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/mdflush.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/naptime.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/oomkill.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/opensnoop.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/pidpersec.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/runqlat.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/runqlen.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/setuids.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/statsnoop.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/swapin.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/syncsnoop.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/syscount.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/tcpaccept.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/tcpconnect.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/tcpdrop.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/tcplife.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/tcpretrans.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/tcpsynbl.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/threadsnoop.bt.8.gz
(Wide character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/vfscount.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/vfsstat.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/writeback.bt.8.gz (Wide
character in subroutine entry)
debsums: can't check bpftrace file /usr/share/man/man8/xfsdist.bt.8.gz (Wide
character in subroutine entry)
--- End Message ---
--- Begin Message ---
Am 30.05.22 um 07:59 schrieb Philipp Marek:
Hi Bernhard,
#6 0x00007ffff7f6ee13 in bpf_prog_load_deprecated () from
/lib/x86_64-linux-gnu/libbpf.so.0
#7 0x00007ffff7dc0e17 in libbpf_bpf_prog_load () from
/usr/local/lib/libbcc_bpf.so.0
#8 0x00007ffff7dc2329 in bcc_prog_load_xattr () from
/usr/local/lib/libbcc_bpf.so.0
#9 0x00007ffff7dc2b7a in bcc_prog_load () from
/usr/local/lib/libbcc_bpf.so.0>>>
I tried if I could reproduce the crash, when I saw your backtrace
shows a library loaded from /usr/local/lib.
This looks like you installed a local version of the library?
Does the crash also occur if you move these local libraries,
so the process does use the version supplied by Debian?
Ah, thanks.
No, it doesn't crash then -- seems that happened in the one shell
that had the /usr/bin/bpftrace path cached after I built and
installed bpftrace from source...
Thanks!
Ph.
Great, then I guess it is ok to close this bug.
--- End Message ---
