Bug#925553: audacity: segfault in NumericTextCtrl::ValueToControls() ()
Control: retitle 925553 audacity: with ssh X-forwarding: PaAlsaStreamComponent_BeginPolling: Assertion `ret == self->nfds' failed.
Hello Jeff Cliff,
I looked at this backtrace without deeper knowledge of
audacity and the problem might not be a segfault in
mentioned funciton, instead a SIGABRT from pulseaudio.
Instead I guess it is in the first backtrace of yours,
showing in libportaudio.so.2.
By the way, installing the debug symbols [1] would be helpful
for the maintainers to get an idea of where the problem is.
In this case package libportaudio2-dbgsym.
Having audacity running in gdb with an active breakpoint
at PaAlsaStreamComponent_BeginPolling and just continuing
a few times leads to such a backtrace.
(But my "network" connection was just into a VM on the same host.)
Did you also debug audacity or did you let it run freely?
Is your ssh connection over a slow network link?
Should this bug be reassigned to pulseaudio?
Kind regards,
Bernhard
[1] https://wiki.debian.org/HowToGetABacktrace#Installing_the_debugging_symbols
(gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1 0x00007ffff3661535 in __GI_abort () at abort.c:79
#2 0x00007ffff366140f in __assert_fail_base (fmt=0x7fffe92021d2 "%s%s%s:%u: %s%sZusicherung »%s« nicht erfüllt.\n%n", assertion=0x7ffff7d7a66e "ret == self->nfds", file=0x7ffff7d74038 "src/hostapi/alsa/pa_linux_alsa.c", line=3641, function=<optimized out>) at assert.c:92
#3 0x00007ffff366f0f2 in __GI___assert_fail (assertion=assertion@entry=0x7ffff7d7a66e "ret == self->nfds", file=file@entry=0x7ffff7d74038 "src/hostapi/alsa/pa_linux_alsa.c", line=line@entry=3641, function=function@entry=0x7ffff7d7abe0 <__PRETTY_FUNCTION__.12102> "PaAlsaStreamComponent_BeginPolling") at assert.c:101
#4 0x00007ffff7d5c1c3 in PaAlsaStreamComponent_BeginPolling (pfds=<optimized out>, self=<optimized out>) at src/hostapi/alsa/pa_linux_alsa.c:3641
#5 0x00007ffff7d69e85 in PaAlsaStreamComponent_BeginPolling (pfds=<optimized out>, self=<optimized out>) at src/hostapi/alsa/pa_linux_alsa.c:3931
#6 PaAlsaStream_WaitForFrames (self=self@entry=0x555556867c00, framesAvail=framesAvail@entry=0x7fffe8007720, xrunOccurred=xrunOccurred@entry=0x7fffe800771c) at src/hostapi/alsa/pa_linux_alsa.c:3802
#7 0x00007ffff7d6a63e in CallbackThreadFunc (userData=0x555556867c00) at src/hostapi/alsa/pa_linux_alsa.c:4274
#8 0x00007ffff3b34fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#9 0x00007ffff373882f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
# Buster amd64 qemu VM 2019-03-28
apt update
apt dist-upgrade
apt install dpkg-dev devscripts systemd-coredump alsa-utils audacity pulseaudio libportaudio2-dbgsym gdb elfutils elfutils-dbgsym libelf1-dbgsym strace binutils mc
$ ssh -X -p2222 benutzer@$LOCALIP
benutzer@debian:~$ audacity
-> record -> no crash -> cursor is moving as usual
##########
cp -a /usr/lib/x86_64-linux-gnu/libportaudio.so.2.0.0 /tmp/libportaudio.so.2.0.0
cp -a /usr/lib/debug/.build-id/4d/7ecbcc022ad848e4da5356dfeaf76b5230731d.debug /tmp/7ecbcc022ad848e4da5356dfeaf76b5230731d.debug
LANG=C eu-unstrip --force /tmp/libportaudio.so.2.0.0 /tmp/7ecbcc022ad848e4da5356dfeaf76b5230731d.debug
eu-unstrip: cannot write output file: invalid section alignment
# Doh!
mkdir /home/benutzer/source/elfutils/orig -p
cd /home/benutzer/source/elfutils/orig
apt source elfutils
cd
mkdir /home/benutzer/source/libc6/orig -p
cd /home/benutzer/source/libc6/orig
apt source libc6
cd
grep "invalid section alignment" . -rn
grep "ELF_E_INVALID_SHENTSIZE_IDX" . -rn
grep "ELF_E_INVALID_SHENTSIZE" . -rn
gdb -q -ex 'set width 0' -ex 'set pagination off' -ex 'directory /home/benutzer/source/elfutils/orig/elfutils-0.176/libelf' -ex 'b elf32_updatenull.c:399' -ex 'run' --args eu-unstrip --force /tmp/libportaudio.so.2.0.0 /tmp/7ecbcc022ad848e4da5356dfeaf76b5230731d.debug
(gdb) bt
#0 __libelf_seterrno (value=value@entry=36) at elf_error.c:336
#1 0x00007ffff7fb3f7a in __elf64_updatenull_wrlock (elf=elf@entry=0x555555564f30, change_bop=change_bop@entry=0x7fffffffd2ec, shnum=shnum@entry=35) at elf32_updatenull.c:215
#2 0x00007ffff7fb2fb0 in elf_update (elf=0x555555564f30, cmd=ELF_C_WRITE) at elf_update.c:209
#3 0x000055555555bb67 in copy_elided_sections (unstripped=<optimized out>, stripped=<optimized out>, stripped_ehdr=<optimized out>, bias=<optimized out>) at unstrip.c:2070
#4 0x000055555555c1a3 in handle_file (output_file=0x0, create_dirs=<optimized out>, stripped=0x555555563900, stripped_ehdr=0x7fffffffe200, unstripped=0x555555564f30) at unstrip.c:2132
#5 0x000055555555c3b9 in handle_explicit_files (output_file=0x0, create_dirs=<optimized out>, force=<optimized out>) at unstrip.c:2223
#6 0x0000555555556c81 in main (argc=<optimized out>, argv=0x7fffffffe558) at unstrip.c:2558
1: x/i $pc
=> 0x7ffff7faa520 <__libelf_seterrno>: push %rbx
##########
mkdir /home/benutzer/source/libportaudio2/orig -p
cd /home/benutzer/source/libportaudio2/orig
apt source libportaudio2
cd
script -c "gdb -q -ex 'set width 0' -ex 'set pagination off' -ex 'b main' -ex 'run' --args audacity" -a gdb-dissassemble_$(date +%Y-%m-%d_%H-%M-%S).log
cat gdb-dissassemble_2019-03-28_18-58-31.log | grep -E "info share|7ffff7d5c1a0|(63e |e85 |1c3 )" -B1
Breakpoint 1, 0x000055555593f190 in main ()
(gdb) info share
--
0x00007ffff7f8a130 0x00007ffff7faa023 Yes (*) /lib/x86_64-linux-gnu/libexpat.so.1
0x00007ffff7d5c1a0 0x00007ffff7d72fe6 Yes /usr/lib/x86_64-linux-gnu/libportaudio.so.2
--
(*): Shared library is missing debugging information.
(gdb) disassemble 0x00007ffff7d5c1a0,0x00007ffff7d72fe6
Dump of assembler code from 0x7ffff7d5c1a0 to 0x7ffff7d72fe6:
...
0x00007ffff7d5c1be <PaAlsaStreamComponent_BeginPolling+30>: callq 0x7ffff7d5bf00 <__assert_fail@plt>
0x00007ffff7d5c1c3 <CalculatePollTimeout+0>: lea 0x1e9f6(%rip),%rcx # 0x7ffff7d7abc0 <__PRETTY_FUNCTION__.11747>
...
0x00007ffff7d69e80 <PaAlsaStream_WaitForFrames+1808>: callq 0x7ffff7d5c1a0 <PaAlsaStreamComponent_BeginPolling>
0x00007ffff7d69e85 <PaAlsaStream_WaitForFrames+1813>: callq 0x7ffff7d5c0a0 <__stack_chk_fail@plt>
...
0x00007ffff7d6a639 <CallbackThreadFunc+409>: callq 0x7ffff7d69770 <PaAlsaStream_WaitForFrames>
0x00007ffff7d6a63e <CallbackThreadFunc+414>: test %eax,%eax
.
gdb -q -ex 'set width 0' -ex 'set pagination off' -ex 'directory /home/benutzer/source/libportaudio2/orig/portaudio19-19.6.0' -ex 'b main' -ex 'run' --args audacity
(gdb) disassemble PaAlsaStreamComponent_BeginPolling,PaAlsaStreamComponent_BeginPolling+42
Dump of assembler code from 0x7ffff7d5c1a0 to 0x7ffff7d5c1ca:
0x00007ffff7d5c1a0 <PaAlsaStreamComponent_BeginPolling+0>: lea 0x1ea39(%rip),%rcx # 0x7ffff7d7abe0 <__PRETTY_FUNCTION__.12102>
0x00007ffff7d5c1a7 <PaAlsaStreamComponent_BeginPolling+7>: lea 0x17e8a(%rip),%rsi # 0x7ffff7d74038
0x00007ffff7d5c1ae <PaAlsaStreamComponent_BeginPolling+14>: lea 0x1e4b9(%rip),%rdi # 0x7ffff7d7a66e
0x00007ffff7d5c1b5 <PaAlsaStreamComponent_BeginPolling+21>: sub $0x8,%rsp
0x00007ffff7d5c1b9 <PaAlsaStreamComponent_BeginPolling+25>: mov $0xe39,%edx
0x00007ffff7d5c1be <PaAlsaStreamComponent_BeginPolling+30>: callq 0x7ffff7d5bf00 <__assert_fail@plt>
0x00007ffff7d5c1c3 <CalculatePollTimeout+0>: lea 0x1e9f6(%rip),%rcx # 0x7ffff7d7abc0 <__PRETTY_FUNCTION__.11747>
End of assembler dump.
(gdb) list pa_linux_alsa.c:3634,+12
3634 /** Fill in pollfd objects.
3635 */
3636 static PaError PaAlsaStreamComponent_BeginPolling( PaAlsaStreamComponent* self, struct pollfd* pfds )
3637 {
3638 PaError result = paNoError;
3639 int ret = alsa_snd_pcm_poll_descriptors( self->pcm, pfds, self->nfds );
3640 (void)ret; /* Prevent unused variable warning if asserts are turned off */
3641 assert( ret == self->nfds );
3642
3643 self->ready = 0;
3644
3645 return result;
3646 }
(gdb) b *0x00007ffff7d5c1be
Breakpoint 5 at 0x7ffff7d5c1be: file src/hostapi/alsa/pa_linux_alsa.c, line 3641.
(gdb) b *0x00007ffff7d69e80
Breakpoint 3 at 0x7ffff7d69e80: file src/hostapi/alsa/pa_linux_alsa.c, line 3931.
(gdb) b *0x00007ffff7d6a639
Breakpoint 4 at 0x7ffff7d6a639: file src/hostapi/alsa/pa_linux_alsa.c, line 4274.
###########
# From submitter, modified frames #4, #5, #6:
(gdb) bt
#0 0x00007f02396718bb in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1 0x00007f023965c535 in __GI_abort () at abort.c:79
#2 0x00007f023965c40f in __assert_fail_base(fmt=0x7f02397beee0 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x7f023dd7566e "ret == self->nfds", file=0x7f023dd6f038 "src/hostapi/alsa/pa_linux_alsa.c", line=3641, function=<optimized out>) at assert.c:92
#3 0x00007f023966a0f2 in __GI___assert_fail(assertion=0x7f023dd7566e "ret == self->nfds", file=0x7f023dd6f038 "src/hostapi/alsa/pa_linux_alsa.c", line=3641, function=0x7f023dd75be0 "PaAlsaStreamComponent_BeginPolling") at assert.c:101
#4 0x00007f023dd571c3 in PaAlsaStreamComponent_BeginPolling(): pa_linux_alsa.c, line 3641: assert( ret == self->nfds );
#5 0x00007f023dd64e85 in PaAlsaStream_WaitForFrames(): pa_linux_alsa.c, line 3931: callq 0x...1a0 <PaAlsaStreamComponent_BeginPolling>
#6 0x00007f023dd6563e in CallbackThreadFunc(): pa_linux_alsa.c, line 4274: PA_ENSURE( PaAlsaStream_WaitForFrames( stream, &framesAvail, &xrun ) );
#7 0x00007f0239b2ffa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8 0x00007f023973382f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb) info registers
rax 0x12 18
rbx 0x55d082be8a70 94354035083888
rcx 0xf0 240
rdx 0x55d082be1968 94354035054952
rsi 0x55d082be1920 94354035054880
rdi 0x7ffe30b4a100 140729715564800
rbp 0x7ffe30b4a100 0x7ffe30b4a100
rsp 0x7ffe30b4a0e8 0x7ffe30b4a0e8
r8 0x2 2
r9 0x55d0825ebbe0 94354028805088
r10 0x16 22
r11 0x30 48
r12 0x55d082c0bb30 94354035227440
r13 0x55d082976210 94354032517648
r14 0x7f023d0b7f50 139647590825808
r15 0x55d082d80300 94354036753152
rip 0x55d080a0f5d0 0x55d080a0f5d0 <void std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >::_M_construct<wchar_t*>(wchar_t*, wchar_t*, std::forward_iterator_tag)>
eflags 0x10246 [ PF ZF IF RF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0
###########
ssh -X -p2222 benutzer@$LOCALIP
gdb -q -ex 'set width 0' -ex 'set pagination off' -ex 'directory /home/benutzer/source/libportaudio2/orig/portaudio19-19.6.0' -ex 'b PaAlsaStreamComponent_BeginPolling' -ex 'run' --args audacity
(gdb) cont
Continuing.
audacity: src/hostapi/alsa/pa_linux_alsa.c:3641: PaAlsaStreamComponent_BeginPolling: Zusicherung »ret == self->nfds« nicht erfüllt.
Thread 9 "audacity" received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50 ../sysdeps/unix/sysv/linux/raise.c: Datei oder Verzeichnis nicht gefunden.
1: x/i $pc
=> 0x7ffff36768bb <__GI_raise+267>: mov 0x108(%rsp),%rcx
(gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1 0x00007ffff3661535 in __GI_abort () at abort.c:79
#2 0x00007ffff366140f in __assert_fail_base (fmt=0x7fffe92021d2 "%s%s%s:%u: %s%sZusicherung »%s« nicht erfüllt.\n%n", assertion=0x7ffff7d7a66e "ret == self->nfds", file=0x7ffff7d74038 "src/hostapi/alsa/pa_linux_alsa.c", line=3641, function=<optimized out>) at assert.c:92
#3 0x00007ffff366f0f2 in __GI___assert_fail (assertion=assertion@entry=0x7ffff7d7a66e "ret == self->nfds", file=file@entry=0x7ffff7d74038 "src/hostapi/alsa/pa_linux_alsa.c", line=line@entry=3641, function=function@entry=0x7ffff7d7abe0 <__PRETTY_FUNCTION__.12102> "PaAlsaStreamComponent_BeginPolling") at assert.c:101
#4 0x00007ffff7d5c1c3 in PaAlsaStreamComponent_BeginPolling (pfds=<optimized out>, self=<optimized out>) at src/hostapi/alsa/pa_linux_alsa.c:3641
#5 0x00007ffff7d69e85 in PaAlsaStreamComponent_BeginPolling (pfds=<optimized out>, self=<optimized out>) at src/hostapi/alsa/pa_linux_alsa.c:3931
#6 PaAlsaStream_WaitForFrames (self=self@entry=0x555556867c00, framesAvail=framesAvail@entry=0x7fffe8007720, xrunOccurred=xrunOccurred@entry=0x7fffe800771c) at src/hostapi/alsa/pa_linux_alsa.c:3802
#7 0x00007ffff7d6a63e in CallbackThreadFunc (userData=0x555556867c00) at src/hostapi/alsa/pa_linux_alsa.c:4274
#8 0x00007ffff3b34fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#9 0x00007ffff373882f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb) info thread
Id Target Id Frame
1 Thread 0x7fffe9fae600 (LWP 18776) "audacity" 0x00007ffff372db69 in __GI___poll (fds=0x7fffffffdc08, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
7 Thread 0x7fffe91e3700 (LWP 18785) "audacity" 0x00007ffff3b3ebf0 in __GI___nanosleep (requested_time=0x7fffe91e25b0, remaining=0x0) at ../sysdeps/unix/sysv/linux/nanosleep.c:28
8 Thread 0x7fffe89ca700 (LWP 18786) "audacity" 0x00007ffff3b3ebf0 in __GI___nanosleep (requested_time=0x7fffe89c95b0, remaining=0x0) at ../sysdeps/unix/sysv/linux/nanosleep.c:28
* 9 Thread 0x7fffe8008700 (LWP 18787) "audacity" __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
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