On Fri, Aug 27, 2010 at 09:25:34PM +0200, Fabian Keil wrote: > Kostik Belousov <kostikbel_at_gmail.com> wrote: > > > On Fri, Aug 27, 2010 at 06:21:08PM +0200, Fabian Keil wrote: > > > The recent lib/libc/stdlib/atexit.c changes broke emacs (23.2_2,2) for > > > me. It aborts on exit (C-x C-c) after receiving SIGBUS: > > > > > > fk_at_r500 ~ $gdb emacs > > > GNU gdb 6.1.1 [FreeBSD] > > > Copyright 2004 Free Software Foundation, Inc. > > > GDB is free software, covered by the GNU General Public License, and > > > you are welcome to change it and/or distribute copies of it under > > > certain conditions. Type "show copying" to see the conditions. > > > There is absolutely no warranty for GDB. Type "show warranty" for > > > details. This GDB was configured as "amd64-marcel-freebsd"... > > > (gdb) run > > > Starting program: /usr/local/bin/emacs > > > [New LWP 100281] > > > [New Thread 1260600 (LWP 100281)] > > > > > > Program received signal SIGBUS, Bus error. > > > [Switching to Thread 1260600 (LWP 100281)] > > > 0x00000008045c432d in __elf_phdr_match_addr () from /lib/libc.so.7 > > > (gdb) where > > > #0 0x00000008045c432d in __elf_phdr_match_addr () from /lib/libc.so.7 > > > #1 0x0000000803038abb in __pthread_cxa_finalize () > > > from /lib/libthr.so.3 #2 0x00000008045bdfa7 in __cxa_finalize () > > > from /lib/libc.so.7 #3 0x00000008045682c7 in exit () > > > from /lib/libc.so.7 #4 0x0000000000556817 in Fkill_emacs (arg=Could > > > not find the frame base for "Fkill_emacs". ) at emacs.c:2146 > > > #5 0x0000000000600ec0 in Ffuncall (nargs=1, args=0x7fffffffc880) at > > > eval.c:3024 #6 0x0000000000658d47 in Fbyte_code (bytestr=8602321, > > > vector=8602357, maxdepth=20) at bytecode.c:680 #7 0x00000000006017e6 > > > in funcall_lambda (fun=8602229, nargs=0, arg_vector=0x7fffffffcdc8) at > > > eval.c:3211 #8 0x00000000006011e0 in Ffuncall (nargs=1, > > > args=0x7fffffffcdc0) at eval.c:3070 #9 0x0000000000658d47 in > > > Fbyte_code (bytestr=9558105, vector=9558141, maxdepth=20) at > > > bytecode.c:680 #10 0x00000000006017e6 in funcall_lambda (fun=9558029, > > > nargs=1, arg_vector=0x7fffffffd358) at eval.c:3211 #11 > > > 0x00000000006011e0 in Ffuncall (nargs=2, args=0x7fffffffd350) at > > > eval.c:3070 #12 0x00000000005fb954 in Fcall_interactively > > > (function=11961778, record_flag=11544578, keys=20138021) at > > > callint.c:869 #13 0x0000000000600f36 in Ffuncall (nargs=4, > > > args=0x7fffffffd760) at eval.c:3030 #14 0x00000000006008fd in call3 > > > (fn=11756290, arg1=11961778, arg2=11544578, arg3=20138021) at > > > eval.c:2850 #15 0x000000000056b7ac in Fcommand_execute (cmd=11961778, > > > record_flag=11544578, keys=20138021, special=11544674) at > > > keyboard.c:10507 #16 0x000000000055cc69 in read_char (commandflag=1, > > > nmaps=2, maps=0x7fffffffdb70, prev_event=11544578, > > > used_mouse_menu=0x7fffffffded4, end_time=0x0) at keyboard.c:3166 #17 > > > 0x000000000056880e in read_key_sequence (keybuf=0x7fffffffe280, > > > bufsize=30, prompt=11544578, dont_downcase_last=0, > > > can_return_switch_frame=1, fix_current_buffer=1) at keyboard.c:9512 > > > #18 0x0000000000558a33 in command_loop_1 () at keyboard.c:1643 #19 > > > 0x00000000005fe0aa in internal_condition_case (bfun=0x5586a0 > > > <command_loop_1>, handlers=11629954, hfun=0x557f90 <cmd_error>) at > > > eval.c:1490 #20 0x000000000055836a in command_loop_2 () at > > > keyboard.c:1360 #21 0x00000000005fda2c in internal_catch > > > (tag=11621170, func=0x558350 <command_loop_2>, arg=11544578) at > > > eval.c:1226 #22 0x0000000000558320 in command_loop () at > > > keyboard.c:1339 #23 0x0000000000557a85 in recursive_edit_1 () at > > > keyboard.c:954 #24 0x0000000000557c45 in Frecursive_edit () at > > > keyboard.c:1016 #25 0x00000000005560b8 in main (argc=1, > > > argv=0x7fffffffe840) at emacs.c:1833 > > > > > > Reverting to lib/libc/stdlib/atexit.c 1.9 gets it working again, > > > using 1.11 brings back the crashes. I didn't csup between those > > > versions and thus don't have 1.10 in git, but given that it's a > > > style change it shouldn't matter. > > > > > > I'm using amd64 and so far I only noticed the problem with emacs. > > > > > > Is anyone else seeing this? > > Reverting the atexit change might cover the issue in some other place. > > Please build and install rtld, libc and libthr with symbolic > > debug information. On of the way to do this is to: > > cd /usr/src/libexec/rtld-elf > > make obj && make depend && make all install DEBUG_FLAGS=-g > > cd ../../lib/libc > > make obj && make depend && make all install DEBUG_FLAGS=-g > > cd ../../lib/libthr > > make obj && make depend && make all install DEBUG_FLAGS=-g > > > > Then, reproduce the crash and get "bt full" output from the > > core. I may need some further information after that. > > #0 0x00000008045dd44c in kill () at kill.S:3 > 3 RSYSCALL(kill) > [New Thread 1260600 (LWP 100244)] > (gdb) bt full > #0 0x00000008045dd44c in kill () at kill.S:3 > No locals. > #1 0x00000000005545c0 in fatal_error_signal (sig=10) at emacs.c:402 > No locals. > #2 <signal handler called> > No symbol table info available. > #3 __elf_phdr_match_addr (phdr_info=0x7fffffffcf90, addr=0x69ba20) at /usr/src/lib/libc/gen/elf_utils.c:39 > i = 109 > #4 0x0000000803038fdb in __pthread_cxa_finalize (phdr_info=0x7fffffffcf90) at /usr/src/lib/libthr/thread/thr_fork.c:109 > af = (struct pthread_atfork *) 0xe1e7c0 > af1 = (struct pthread_atfork *) 0x0 > #5 0x00000008045be0a7 in __cxa_finalize (dso=0x0) at /usr/src/lib/libc/stdlib/atexit.c:204 > phdr_info = {dlpi_addr = 0, dlpi_name = 0x7fffffffd080 "`????\177", dlpi_phdr = 0x7fffffffe848, dlpi_phnum = 59448, dlpi_adds = 0, dlpi_subs = 34367899629, > dlpi_tls_modid = 15046784, dlpi_tls_data = 0x12c2538} > p = (struct atexit *) 0x0 > fn = {fn_type = 1, fn_ptr = {std_func = 0x8007ccff0 <rtld_exit>, cxa_func = 0x8007ccff0 <rtld_exit>}, fn_arg = 0x0, fn_dso = 0x0} > n = -1 > has_phdr = 0 > #6 0x00000008045683c7 in exit (status=0) at /usr/src/lib/libc/stdlib/exit.c:67 > No locals. > #7 0x0000000000556817 in Fkill_emacs (arg=Could not find the frame base for "Fkill_emacs". > ) at emacs.c:2146 > gcpro1 = Could not find the frame base for "Fkill_emacs". > Current language: auto; currently asm > > Fabian Ewww. Please try this. diff --git a/lib/libc/stdlib/atexit.c b/lib/libc/stdlib/atexit.c index 97cf234..511172a 100644 --- a/lib/libc/stdlib/atexit.c +++ b/lib/libc/stdlib/atexit.c _at__at_ -200,6 +200,6 _at__at_ __cxa_finalize(void *dso) if (dso == NULL) _MUTEX_DESTROY(&atexit_mutex); - if (&__pthread_cxa_finalize != NULL) + if (has_phdr && &__pthread_cxa_finalize != NULL) __pthread_cxa_finalize(&phdr_info); }
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