Bug 519226
| Summary: | LD_BIND_NOW=true (in /usr/bin/startkde) => badness | ||||||
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| Product: | [Fedora] Fedora | Reporter: | Sergei LITVINENKO <sergei.litvinenko> | ||||
| Component: | glibc | Assignee: | Andreas Schwab <schwab> | ||||
| Status: | CLOSED RAWHIDE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | low | ||||||
| Version: | rawhide | CC: | drepper, dzickus, fedora, jakub, john.ellson, jreznik, kevin, lorenzo, lpoetter, ltinkl, mgress, mhuhtala, rdieter, schwab, selinux, sergei.litvinenko, smparrish, than, thomasj, zkabelac | ||||
| Target Milestone: | --- | Keywords: | Reopened | ||||
| Target Release: | --- | ||||||
| Hardware: | All | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2009-09-07 11:05:20 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: | |||||||
| Bug Depends On: | 519081 | ||||||
| Bug Blocks: | 520480 | ||||||
| Attachments: |
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Description
Sergei LITVINENKO
2009-08-25 17:55:19 UTC
Probably linked with bug #515539 and/or bug #519081 (more likely the latter) yes, delete "LD_BIND_NOW=true" before "+kdeinit4 +kcminit_startup" help. KDE do not crash. /usr/bin/startkde -LD_BIND_NOW=true kdeinit4 +kcminit_startup +kdeinit4 +kcminit_startup *** Bug 519719 has been marked as a duplicate of this bug. *** So reading bz515539, running 'prelink -f /usr/bin/kdeinit4' solved all my segfault problems on login. >>
>> 'prelink -f /usr/bin/kdeinit4'
>>
prelink is not necessary and I do do not use it on desktop.
prelink -ua
rpm -e prelink
OK, let's consider this the canonical LD_BIND_NOW=true in /usr/bin/startkde => badness bug, and volley to glibc folks for assistance. It looks like LD_BIND_NOW is causing an unrelocated address to be put in the PLT slot. 0x00007ffff3884d80 in strstr@plt () from /lib64/libglib-2.0.so.0 1: x/i $pc 0x7ffff3884d80 <strstr@plt>: jmpq *0x2d1832(%rip) # 0x7ffff3b565b8 <fflush+2954136> (gdb) x/gx 0x7ffff3b565b8 0x7ffff3b565b8 <fflush+2954136>: 0x00000000000895f0 (gdb) p/a $__+0x7ffff4179000 $1 = 0x7ffff42025f0 <__strstr_sse2> Can you reduce the test case to something not including the KDE monster? What's the dependency order? LD_DEBUG output etc. Ulrich, not sure if this helps in any way, but a very easy way to trigger this is doing this: $ LD_BIND_NOW=1 /usr/libexec/pulse/gconf-helper (Needs pulseaudio-module-gconf installed which is installed by default) The gconf-helper tool is pretty simple, however still pulls in glib, gconf, orbit. *** Bug 516671 has been marked as a duplicate of this bug. *** Ulrich, it seems every application crashes with LD_BIND_NOW=1 on x86_64 with latest rawhide. I tried several times with LD_BIND_NOW=1 ls and got the segmentation fault. It doesn't crash by 1. time, you have to try several times to get it. Created attachment 359474 [details]
output
the debug output
Looking at it, it is quite obvious what's wrong. Out of the current IFUNC defining objects in glibc: for i in */*.os; do case $i in elf/ifuncmod*) continue;; esac; \ readelf -Ws $i 2>/dev/null | grep -q IFUNC \ && readelf -Wr $i | grep -q GOTPCREL && echo $i \ && readelf -Wr $i | grep GOTPCREL; done math/s_fmaf.os 0000000000000030 0000001100000009 R_X86_64_GOTPCREL 0000000000000010 __fmaf_sse2 - 4 0000000000000038 0000001000000009 R_X86_64_GOTPCREL 0000000000000000 __fmaf_fma - 4 math/s_fma.os 0000000000000030 0000001100000009 R_X86_64_GOTPCREL 0000000000000010 __fma_sse2 - 4 0000000000000038 0000001000000009 R_X86_64_GOTPCREL 0000000000000000 __fma_fma - 4 string/strcasestr-c.os 0000000000000018 0000001500000009 R_X86_64_GOTPCREL 0000000000000c20 __strcasestr_sse2 - 4 0000000000000020 0000001600000009 R_X86_64_GOTPCREL 0000000000000000 __strcasestr_sse42 - 4 string/strstr-c.os 0000000000000118 0000001500000009 R_X86_64_GOTPCREL 0000000000000540 __strstr_sse2 - 4 0000000000000120 0000001600000009 R_X86_64_GOTPCREL 0000000000000000 __strstr_sse42 - 4 As IFUNC relocations aren't ordered before other relocations, it is possible a call to indirect function is done before the target library has relative relocations resolved. I think just adding hidden attributes should cure this. That said, I still wonder how fma/fmaf can work reliably, when it calls into a different DSO and the PLT slot is likely not initialized etc. *** Bug 520973 has been marked as a duplicate of this bug. *** Should be fixed upstream. Andreas will hopefully build a new version tomorrow. Ulrich, i tried "LD_BIND_NOW=1 ls" on i386 machine today, it crashes too. It could be the same problem like on x86_64 The files are shared so it automagically receives the same fix. Fixed in 2.10.90-20. The most important file is not shared :-( i even tested the 2.10.90-20, it still crashes on i386 machine I fixed x86 as well. Perhaps irrelevant at this point, but Bug 520973 was marked as a dup of this bug, and this bug was originally reported as KDE related. Bug 520973 was on a Gnome desktop, x86_64 system. glibc-2_10_90-21 now fixes this issue for me. Thanks *** Bug 515539 has been marked as a duplicate of this bug. *** *** Bug 521509 has been marked as a duplicate of this bug. *** Fixed. *** Bug 521976 has been marked as a duplicate of this bug. *** |