Bug 480141
| Summary: | /proc/ppc64/rtas/error_log: read: Invalid argument | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 4 | Reporter: | Qian Cai <qcai> |
| Component: | kernel | Assignee: | Red Hat Kernel Manager <kernel-mgr> |
| Status: | CLOSED NOTABUG | QA Contact: | Martin Jenner <mjenner> |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | 4.7 | CC: | vmayatsk |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | ppc64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2009-01-16 08:48:50 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: | |||
Vitaly, you can see from comment #0, and also the LTP test from comment #1 were both using 4096 as the buffer size, so perhaps it is still not large enough? You are correct. A bigger buffer like 40960 works fine. # ./rtas read: Success # ./rtas read: Resource temporarily unavailable # ./rtas read: Resource temporarily unavailable # ./rtas read: Resource temporarily unavailable So this should be closed as NOTABUG and send a patch to LTP instead. Thanks. |
Description of problem: # uname -a Linux squad3.rhts.bos.redhat.com 2.6.9-78.0.13.EL #1 SMP Wed Jan 7 17:25:20 EST 2009 ppc64 ppc64 ppc64 GNU/Linux # cat rtas.c #include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <errno.h> int main (void) { int fd; char buf[4096]; fd = open ("/proc/ppc64/rtas/error_log", O_RDONLY | O_NONBLOCK); read (fd, buf, 4096); perror ("read"); return 0; } # gcc rtas.c -o rtas # ./rtas read: Invalid argument It looks like this only happen the first time. Next time running the reproducer (not matter reboot the machine or not, boot a different kernel or not), it will hang forever, which indicates the same bug in RHEL 5. Bug 376831 - Read from /proc/ppc64/rtas/error_log does not honor O_NONBLOCK Version-Release number of selected component (if applicable): kernel-2.6.9-78.0.13.EL kernel-2.6.9-78.EL How reproducible: always