Bug 117028
| Summary: | gdb can't unwind the stack across altstack signal handler boundary | ||||||
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| Product: | Red Hat Enterprise Linux 3 | Reporter: | Johan Walles <johan.walles> | ||||
| Component: | gdb | Assignee: | Elena Zannoni <ezannoni> | ||||
| Status: | CLOSED DUPLICATE | QA Contact: | Jay Turner <jturner> | ||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | medium | ||||||
| Version: | 3.0 | CC: | cagney, ihse, jjohnstn, srevivo | ||||
| Target Milestone: | --- | ||||||
| Target Release: | --- | ||||||
| Hardware: | i686 | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2006-02-21 19:01:41 UTC | Type: | --- | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Attachments: |
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Created attachment 98108 [details]
Repro case. Break in handler() and do "bt" to get an incomplete stacktrace
This is a regression. I just tried the same test with a vanilla (i.e. no Redhat patches) 5.3 and 6.0. The test works fine with gdb-5.3, but fails with 6.0. *** This bug has been marked as a duplicate of 117972 *** Changed to 'CLOSED' state since 'RESOLVED' has been deprecated. |
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030624 Description of problem: I'll attach a program that sets up an altstack signal handler for SIGUSR1. Gdb can't walk the stack across the signal handler boundary. Version-Release number of selected component (if applicable): gdb-6.0post-0.20031117.6 How reproducible: Always Steps to Reproduce: 1. Build the test program I'll soon attach. 2. Start gdb. 3. Put a breakpoint in handler() 4. run Actual Results: johan@quark:~/src/test$ gdb -nx sigaltstack3 GNU gdb Red Hat Linux (6.0post-0.20031117.6rh) Copyright 2003 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 "i386-redhat-linux-gnu"...Using host libthread_db library "/lib/tls/libthread_db.so.1". (gdb) break handler Breakpoint 1 at 0x804849e: file sigaltstack3.c, line 18. (gdb) run Starting program: /home/johan/src/test/sigaltstack3 main(): Hello Program received signal SIGUSR1, User defined signal 1. 0xb75ebc32 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2 (gdb) c Continuing. Breakpoint 1, handler (sig=10, si=0xb6551c98, ctxt=0xb6551d18) at sigaltstack3.c:18 18 printf("Signal handler: Hello\n"); (gdb) bt #0 handler (sig=10, si=0xb6551c98, ctxt=0xb6551d18) at sigaltstack3.c:18 #1 <signal handler called> Expected Results: I expected to get a full stack trace, not just covering the signal handler. Additional info: