Date: Tue, 19 Sep 2017 11:28:49 +0300 From: Michael Zhilin <mizhka@gmail.com> To: Vladimir Zakharov <zakharov.vv@gmail.com> Cc: freebsd-current Current <freebsd-current@freebsd.org> Subject: Re: lldb unusable for regular user Message-ID: <CAF19XBJSotW3yckUyKOdvAcquM5UekWRx8zK-xGvbzd5Ue7kow@mail.gmail.com> In-Reply-To: <20170918114106.jkmpcde6tmvhizhj@vzakharov> References: <20170918114106.jkmpcde6tmvhizhj@vzakharov>
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Hi Volodya, It works for me: [mizhka@gidrarium ~/temp/20170919]$ cc -O0 -g test.c -o test [mizhka@gidrarium ~/temp/20170919]$ ./test PID: 12293 (failed reverse-i-search)`': ^C [mizhka@gidrarium ~/temp/20170919]$ ./test PID: 12294 load: 0.68 cmd: test 12294 [nanslp] 1.39r 0.00u 0.00s 0% 2316k load: 0.68 cmd: test 12294 [nanslp] 3.57r 0.00u 0.00s 0% 2316k load: 0.68 cmd: test 12294 [nanslp] 3.88r 0.00u 0.00s 0% 2316k load: 0.68 cmd: test 12294 [nanslp] 4.18r 0.00u 0.00s 0% 2316k load: 0.71 cmd: test 12294 [nanslp] 8.57r 0.00u 0.00s 0% 2316k load: 0.71 cmd: test 12294 [nanslp] 9.33r 0.00u 0.00s 0% 2316k load: 0.71 cmd: test 12294 [nanslp] 9.83r 0.00u 0.00s 0% 2316k [mizhka@gidrarium ~/temp/20170919]$ lldb ./test (lldb) target create "./test" Current executable set to './test' (x86_64). (lldb) run Process 12300 launching Process 12300 launched: './test' (x86_64) PID: 12300 Process 12300 exited with status = 0 (0x00000000) (lldb) exit [mizhka@gidrarium ~/temp/20170919]$ uname -a FreeBSD gidrarium 12.0-CURRENT FreeBSD 12.0-CURRENT #2 r321414: Mon Jul 24 21:41:54 MSK 2017 mizhka@gidrarium:/usr/obj/usr/src/sys/GENERIC amd64 [mizhka@gidrarium ~/temp/20170919]$ type lldb lldb is hashed (/usr/bin/lldb) [mizhka@gidrarium ~/temp/20170919]$ /usr/bin/lldb -v lldb version 5.0.0 clang revision 308421 But I have r321414 with small patch: https://reviews.freebsd.org/D11738 Today/tomorrow I'll update to latest revision. Hope this information will be useful for you to identify root cause. Thanks! On Mon, Sep 18, 2017 at 2:41 PM, Vladimir Zakharov <zakharov.vv@gmail.com> wrote: > Hello! > > lldb coredumps for regular user, but works for root. > > > uname -a > FreeBSD vzakharov 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r323675: Sun Sep 17 > 21:14:33 MSK 2017 root@vzakharov:/home/obj/usr/src/sys/GENERIC-NODEBUG > amd64 > > cat test.c > #include <stdio.h> > #include <unistd.h> > > int main() > { > printf("PID: %d\n", getpid()); > sleep(10); > return 0; > } > > cc -O0 -g test.c -o test > > lldb ./test > (lldb) target create "./test" > Current executable set to './test' (x86_64). > (lldb) run > Process 37758 launching > Process 37758 launched: './test' (x86_64) > Segmentation fault (core dumped) > Exit 139 > > sudo lldb ./test > (lldb) target create "./test" > Current executable set to './test' (x86_64). > (lldb) run > Process 37776 launching > Process 37776 launched: './test' (x86_64) > PID: 37776 > Process 37776 exited with status = 0 (0x00000000) > (lldb) > > > Postmortem by gdb: > > gdb ./test test.core > ... > [New LWP 101456] > Core was generated by `./test'. > Program terminated with signal SIGTRAP, Trace/breakpoint trap. > #0 _start (ap=0x7fffffffe858, cleanup=0x800605910 <rtld_exit>) at > /usr/src/lib/csu/amd64/crt1.c:50 > 50 { > (gdb) bt > #0 _start (ap=0x7fffffffe858, cleanup=0x800605910 <rtld_exit>) at > /usr/src/lib/csu/amd64/crt1.c:50 > (gdb) f > #0 _start (ap=0x7fffffffe858, cleanup=0x800605910 <rtld_exit>) at > /usr/src/lib/csu/amd64/crt1.c:50 > 50 { > > > gdb `which lldb` lldb.core > ... > Reading symbols from /usr/bin/lldb...Reading symbols from > /usr/lib/debug//usr/bin/lldb.debug...done. > done. > [New LWP 101610] > [New LWP 100968] > [New LWP 100126] > [New LWP 101631] > [New LWP 101637] > [New LWP 101662] > [New LWP 101672] > [New LWP 100337] > [New LWP 101593] > Core was generated by `lldb ./test'. > Program terminated with signal SIGSEGV, Segmentation fault. > #0 x86_64_freebsd_fallback_frame_state (context=0x7fffddff6e20, > context=0x7fffddff6e20, fs=0x7fffddff6b70) at ./md-unwind-support.h:60 > 60 ./md-unwind-support.h: No such file or directory. > [Current thread is 1 (LWP 101610)] > (gdb) f > #0 x86_64_freebsd_fallback_frame_state (context=0x7fffddff6e20, > context=0x7fffddff6e20, fs=0x7fffddff6b70) at ./md-unwind-support.h:60 > 60 in ./md-unwind-support.h > (gdb) bt > #0 x86_64_freebsd_fallback_frame_state (context=0x7fffddff6e20, > context=0x7fffddff6e20, fs=0x7fffddff6b70) at ./md-unwind-support.h:60 > #1 uw_frame_state_for (context=context@entry=0x7fffddff6e20, fs=fs@entry=0x7fffddff6b70) > at /wrkdirs/usr/ports/lang/gcc6/work/gcc-6.4.0/libgcc/unwind-dw2.c:1249 > #2 0x0000000804f6cffb in _Unwind_ForcedUnwind_Phase2 (exc=exc@entry=0x806b23230, > context=context@entry=0x7fffddff6e20) at /wrkdirs/usr/ports/lang/gcc6/ > work/gcc-6.4.0/libgcc/unwind.inc:155 > #3 0x0000000804f6d334 in _Unwind_ForcedUnwind (exc=0x806b23230, > stop=0x804631760 <thread_unwind_stop>, stop_argument=<optimized out>) at > /wrkdirs/usr/ports/lang/gcc6/work/gcc-6.4.0/libgcc/unwind.inc:207 > #4 0x00000008046315c3 in _Unwind_ForcedUnwind (ex=<optimized out>, > stop_func=0xe, stop_arg=0x806b23000) at /usr/src/lib/libthr/thread/ > thr_exit.c:106 > #5 thread_unwind () at /usr/src/lib/libthr/thread/thr_exit.c:172 > #6 _pthread_exit_mask (status=<optimized out>, mask=<optimized out>) at > /usr/src/lib/libthr/thread/thr_exit.c:254 > #7 0x00000008046313eb in _pthread_exit (status=0x806b23000) at > /usr/src/lib/libthr/thread/thr_exit.c:206 > #8 0x0000000804623c0d in thread_start (curthread=0x806b23000) at > /usr/src/lib/libthr/thread/thr_create.c:289 > #9 0x00007fffdddf7000 in ?? () > Backtrace stopped: Cannot access memory at address 0x7fffddff7000 > > -- > Regards, | "In theory there is no difference between theory > Vladimir Zakharov | and practice. In practice there is."- Yogi Berra > _______________________________________________ > freebsd-current@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" >
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