| Summary: | NFS lock requests go missing | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Michael Young <m.a.young> |
| Component: | kernel | Assignee: | Kernel Maintainer List <kernel-maint> |
| Status: | CLOSED WONTFIX | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 14 | CC: | gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2012-08-16 13:45:37 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
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On a fairly busy computer we have had problems where an application started via cron fails to get a lock on an NFS(v3) file most of the time. I wrapped such a program in strace and got the following for such a failed run, open("/home/....../...../..../clamav/freshclam.log", O_WRONLY|O_CREAT|O_APPEN D, 0666) = 3 fstat64(3, {st_mode=S_IFREG|0640, st_size=0, ...}) = 0 mmap2(NULL, 65536, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb 776c000 fstat64(3, {st_mode=S_IFREG|0640, st_size=0, ...}) = 0 _llseek(3, 0, [0], SEEK_SET) = 0 umask(022) = 037 fcntl64(3, F_SETLK, {type=F_WRLCK, whence=SEEK_SET, start=0, len=0}) = -1 EIO (I nput/output error) I also got a network traffic dump and it seems (amidst the noise from other processes) that the file is opened, the computer asks the server what port the lock daemon is listening on, but no locking request is made and about 10 seconds later I see an unlock request for the file it was supposed to have locked. So it seems the kernel forgets to send the lock request to the server, and eventually decides that the server isn't responding and unlocks the file just in case. The kernel is 2.6.35.10-74.fc14.i686.PAE