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[200.232.172.197]) by smtp.gmail.com with ESMTPSA id w1-20020a056870a2c100b0019e8deb387bsm770566oak.53.2023.05.23.05.28.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 23 May 2023 05:28:40 -0700 (PDT) Message-ID: <7242755f-3e24-0a4a-4e18-09e95139da2a@linaro.org> Date: Tue, 23 May 2023 09:27:22 -0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 Subject: Re: [PATCH v6 1/1] nptl: Fix Race conditions in pthread cancellation [BZ#12683] Content-Language: en-US To: DJ Delorie Cc: libc-alpha@sourceware.org, carlos@redhat.com References: From: Adhemerval Zanella Netto Organization: Linaro In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-2.5 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A,RCVD_IN_BARRACUDACENTRAL,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 22/05/23 18:19, DJ Delorie wrote: > > FYI I did a build on my F35 machine with the trybot's commands and > replicated the large list of failures from the trybot. > > dj@envy pts/23 ~/tools/upstream/glibc.cancel.build > $ ./debugglibc.sh rt/tst-timer2 > > Debugging glibc... > Build directory : /envy/dj/tools/upstream/glibc.cancel.build/ > Source directory : /envy/dj/tools/upstream/glibc.cancel > GLIBC Testcase : rt/tst-timer2 > GDB Commands : /envy/dj/tools/upstream/glibc.cancel.build/debugglibc.gdb > Env vars : LC_ALL=C LOCPATH=/envy/dj/tools/upstream/glibc.cancel.build//localedata GCONV_PATH=/envy/dj/tools/upstream/glibc.cancel.build//iconvdata > > Reading symbols from /envy/dj/tools/upstream/glibc.cancel.build//elf/ld.so... > add symbol table from file "rt/tst-timer2" > Breakpoint 1 at 0x1970e > Debuginfod has been disabled. > To make this setting permanent, add 'set debuginfod enabled off' to .gdbinit. > warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available. > > Breakpoint 1, 0xf7fe470e in _dl_start_user () from /envy/dj/tools/upstream/glibc.cancel.build/elf/ld.so > > [ gdb ] c > Continuing. > cnt = 0 > [New LWP 3163750] > > Thread 1 "ld.so" received signal SIGSEGV, Segmentation fault. > __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/i386/syscall_cancel.S:50 > 50 testb $TCB_CANCELED_BITMASK, (%eax) > > [ gdb ] where > #0 __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/i386/syscall_cancel.S:50 > #1 0xf7e0101d in __internal_syscall_cancel (a1=1, a2=-13216, a3=8, a4=0, a5=0, a6=0, nr=4) at cancellation.c:49 > #2 0xf7e01070 in __syscall_cancel (a1=1, a2=-13216, a3=8, a4=0, a5=0, a6=0, nr=4) at cancellation.c:70 > #3 0xf7e84ffc in __GI___libc_write (fd=1, buf=0xffffcc60, nbytes=8) at ../sysdeps/unix/sysv/linux/write.c:26 > #4 0xf7dfcc3b in _IO_new_file_write (f=0xf7fb1da0 <_IO_2_1_stdout_>, data=0xffffcc60, n=8) at fileops.c:1180 > #5 0xf7dfaba3 in new_do_write (fp=fp@entry=0xf7fb1da0 <_IO_2_1_stdout_>, data=data@entry=0xffffcc60 "cnt = 1\n\300\342\377", , to_do=to_do@entry=8) > at /envy/dj/tools/upstream/glibc.cancel/libio/libioP.h:1031 > #6 0xf7dfcde7 in _IO_new_file_xsputn (n=8, data=, f=0xf7fb1da0 <_IO_2_1_stdout_>) at fileops.c:1254 > #7 _IO_new_file_xsputn (f=0xf7fb1da0 <_IO_2_1_stdout_>, data=, n=8) at fileops.c:1196 > #8 0xf7dd37f6 in __printf_buffer_flush_to_file (buf=0xffffcc44) at ../libio/libioP.h:1031 > #9 0xf7dd38b8 in __printf_buffer_to_file_done (buf=0xffffcc44) at printf_buffer_to_file.c:120 > #10 0xf7ddceaf in __vfprintf_internal (s=0xf7fb1da0 <_IO_2_1_stdout_>, format=0xf7fc1010 "cnt = %d\n", ap=0xffffcd24 "\001", mode_flags=0) at vfprintf-internal.c:1475 > #11 0xf7dd2fb5 in __printf (format=0xf7fc1010 "cnt = %d\n") at printf.c:33 > #12 0xf7fbf65a in ?? () > Backtrace stopped: previous frame inner to this frame (corrupt stack?) > > [ gdb ] info reg > eax 0x1 1 > ecx 0xf7d80780 -136837248 > edx 0x0 0 > ebx 0xf7d80700 -136837376 > esp 0xffffca5c 0xffffca5c > ebp 0xf7fb1da0 0xf7fb1da0 <_IO_2_1_stdout_> > esi 0x8 8 > edi 0xffffcc60 -13216 > eip 0xf7e0d4c4 0xf7e0d4c4 <__syscall_cancel_arch+4> > eflags 0x10246 [ PF ZF IF RF ] > cs 0x23 35 > ss 0x2b 43 > ds 0x2b 43 > es 0x2b 43 > fs 0x0 0 > gs 0x63 99 > > [ gdb ] > Thanks, it seems that CFI information is wrong somewhere. I will take a look where it can be.