[Converted from Gnats 2321] Anytime a breakpoint is hit I get the error: "ptrace: No such process." After this, trying to do anything results in: "Couldn't get registers: No such process." As a side note, the process uses nptl and threading. Release: 6.7.50_20070927 Environment: Gentoo Linux gcc: 4.1.2 glibc: 2.6.1
State-Changed-From-To: open->feedback State-Changed-Why: This works fine on Debian using glibc 2.6.1. I suspect some problem or difference in Gentoo's libc. Could you attach the output of running a simple program with "set debug lin-lwp 1" before "run"?
From: Kris Wong <wongk@seapine.com> To: "gdb-gnats@sources.redhat.com" <gdb-gnats@sources.redhat.com> Cc: Subject: Re: threads/2321: After upgrading glibc to v. 2.6.1, receive error stating "ptrace: No such process." Date: Wed, 24 Oct 2007 09:46:17 -0400 --_003_A744DCAEEDDFFD4B9D0D5B153D2712832E695A72ex4seapinecom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Attached is the output of running the problem application. See gdb_debug.l= og. Also, the following command: "killall -s SIGTERM ttserver" Does not kill the process as it would if it were run from the command line = instead of in gdb. See gdb_sigterm.log for the output after sending the si= gnal. Sending the signal a 2nd time does terminate the process correctly. Kris Wong --_003_A744DCAEEDDFFD4B9D0D5B153D2712832E695A72ex4seapinecom_ Content-Type: application/octet-stream; name="gdb_sigterm.log" Content-Description: gdb_sigterm.log Content-Disposition: attachment; filename="gdb_sigterm.log"; size=0; creation-date="Wed, 24 Oct 2007 13:43:45 GMT"; modification-date="Wed, 24 Oct 2007 13:43:45 GMT" Content-Transfer-Encoding: base64 TExXOiB3YWl0cGlkIDE4NjQ0IHJlY2VpdmVkIFRlcm1pbmF0ZWQgKHN0b3BwZWQpCkxMVEE6IFBU UkFDRV9QRUVLVVNFUiBMV1AgMTg2NDQsIDAsIDAgKE9LKQpMTFc6IENhbmRpZGF0ZSBldmVudCBU ZXJtaW5hdGVkIChzdG9wcGVkKSBpbiBMV1AgMTg2NDQuClNDOiAga2lsbCBMV1AgMTg2NTMgKio8 U0lHU1RPUD4qKgpTQzogIGx3cCBraWxsIDAgRVJSTk8tT0sKU0M6ICBraWxsIExXUCAxODY1MiAq KjxTSUdTVE9QPioqClNDOiAgbHdwIGtpbGwgMCBFUlJOTy1PSwpTQzogIGtpbGwgTFdQIDE4NjUx ICoqPFNJR1NUT1A+KioKU0M6ICBsd3Aga2lsbCAwIEVSUk5PLU9LClNDOiAga2lsbCBMV1AgMTg2 NDkgKio8U0lHU1RPUD4qKgpTQzogIGx3cCBraWxsIDAgRVJSTk8tT0sKU0M6ICBraWxsIExXUCAx ODY0OCAqKjxTSUdTVE9QPioqClNDOiAgbHdwIGtpbGwgMCBFUlJOTy1PSwpTQzogIGtpbGwgTFdQ 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From: Daniel Jacobowitz <drow@false.org> To: gdb-gnats@sourceware.org Cc: Subject: Re: threads/2321: After upgrading glibc to v. 2.6.1, receive error stating "ptrace: No such process." Date: Wed, 24 Oct 2007 09:55:59 -0400 On Wed, Oct 24, 2007 at 01:48:01PM -0000, Kris Wong wrote: > Attached is the output of running the problem application. See gdb_debug.l= > og. This log does not contain any indication of an error. -- Daniel Jacobowitz CodeSourcery
From: Kris Wong <wongk@seapine.com> To: "gdb-gnats@sources.redhat.com" <gdb-gnats@sources.redhat.com> Cc: Subject: Re: threads/2321: After upgrading glibc to v. 2.6.1, receive error stating "ptrace: No such process." Date: Thu, 25 Oct 2007 08:40:43 -0400 Here is a snippet of some output from gdb while exhibiting the error. I sh= ould note, I cannot reproduce this every time a breakpoint is hit using ver= sion 6.7, but it is still reproducible. LLW: waitpid 21981 received Trace/breakpoint trap (stopped) LLW: Handling extended status 0x03057f LHEW: Got clone event from LWP 21981, resuming LLW: waitpid 22076 received Trace/breakpoint trap (stopped) LLTA: PTRACE_PEEKUSER LWP 22076, 0, 0 (OK) LLW: Candidate event Trace/breakpoint trap (stopped) in LWP 22076. SC: kill LWP 21994 **<SIGSTOP>** SC: lwp kill 0 ERRNO-OK SC: kill LWP 21987 **<SIGSTOP>** SC: lwp kill 0 ERRNO-OK SC: kill LWP 21986 **<SIGSTOP>** SC: lwp kill 0 ERRNO-OK SC: kill LWP 21985 **<SIGSTOP>** SC: lwp kill 0 ERRNO-OK SC: kill LWP 21983 **<SIGSTOP>** SC: lwp kill 0 ERRNO-OK SC: kill LWP 21982 **<SIGSTOP>** SC: lwp kill 0 ERRNO-OK SC: kill LWP 21981 **<SIGSTOP>** SC: lwp kill 0 ERRNO-OK SC: kill LWP 21978 **<SIGSTOP>** SC: lwp kill 0 ERRNO-OK WL: waitpid LWP 21994 received Stopped (signal) (stopped) WL: waitpid LWP 21987 received Stopped (signal) (stopped) WL: waitpid LWP 21986 received Stopped (signal) (stopped) WL: waitpid LWP 21985 received Stopped (signal) (stopped) WL: waitpid LWP 21983 received Stopped (signal) (stopped) WL: waitpid LWP 21982 received Stopped (signal) (stopped) WL: waitpid LWP 21981 received Stopped (signal) (stopped) WL: waitpid LWP 21978 received Stopped (signal) (stopped) LLW: trap_ptid is LWP 22076. [New LWP 22076] LLR: Preparing to resume process -1, 0, inferior_ptid LWP 22044 RC: PTRACE_CONT LWP 22076, 0, 0 (resume sibling) RC: PTRACE_CONT LWP 21994, 0, 0 (resume sibling) RC: PTRACE_CONT LWP 21987, 0, 0 (resume sibling) RC: PTRACE_CONT LWP 21986, 0, 0 (resume sibling) RC: PTRACE_CONT LWP 21985, 0, 0 (resume sibling) RC: PTRACE_CONT LWP 21983, 0, 0 (resume sibling) RC: PTRACE_CONT LWP 21982, 0, 0 (resume sibling) RC: PTRACE_CONT LWP 21981, 0, 0 (resume sibling) RC: PTRACE_CONT LWP 21978, 0, 0 (resume sibling) ptrace: No such process. (gdb) bt Couldn't get registers: No such process. Couldn't get registers: No such process. (gdb) c Continuing. Couldn't get registers: No such process. (gdb) kill Kill the program being debugged? (y or n) y KC: PTRACE_KILL LWP 22076, 0, 0 (OK) KC: PTRACE_KILL LWP 21994, 0, 0 (OK) KC: PTRACE_KILL LWP 21987, 0, 0 (OK) KC: PTRACE_KILL LWP 21986, 0, 0 (OK) KC: PTRACE_KILL LWP 21985, 0, 0 (OK) KC: PTRACE_KILL LWP 21983, 0, 0 (OK) KC: PTRACE_KILL LWP 21982, 0, 0 (OK) KC: PTRACE_KILL LWP 21981, 0, 0 (OK) KC: PTRACE_KILL LWP 21978, 0, 0 (OK) KWC: wait LWP 22076 received unknown. KWC: wait LWP 21994 received unknown. KWC: wait LWP 21987 received unknown. KWC: wait LWP 21986 received unknown. KWC: wait LWP 21985 received unknown. KWC: wait LWP 21983 received unknown. KWC: wait LWP 21982 received unknown. KWC: wait LWP 21981 received unknown. KWC: wait LWP 21978 received unk.
From: Daniel Jacobowitz <drow@false.org> To: Kris Wong <wongk@seapine.com>, gdb-gnats@sourceware.org Cc: Subject: Re: threads/2321: After upgrading glibc to v. 2.6.1, receive error stating "ptrace: No such process." Date: Thu, 25 Oct 2007 08:57:00 -0400 On Thu, Oct 25, 2007 at 12:48:02PM -0000, Kris Wong wrote: > LLR: Preparing to resume process -1, 0, inferior_ptid LWP 22044 This is the only reference to PID 22044 in your log. That's why we need whole logs - we need to find out where this came from. You have a lot of "New LWP" messages. That shouldn't happen, they should be "New Thread" messages. I suspect that your ld.so or libpthread.so is stripped of the symbols GDB needs to debug threads. -- Daniel Jacobowitz CodeSourcery
*** Bug 9445 has been marked as a duplicate of this bug. ***
Is this bug still valid?
*** Bug 9463 has been marked as a duplicate of this bug. ***
There's no point in keeping this open. Too much has changed meanwhile. If there's still a problem, please file a new bug with new info.