Bug 110895
| Summary: | running processes are not listed in /proc, with ps or top | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 3 | Reporter: | Martin Grimm <martin.grimm> | ||||||
| Component: | kernel | Assignee: | Pete Zaitcev <zaitcev> | ||||||
| Status: | CLOSED ERRATA | QA Contact: | Brian Brock <bbrock> | ||||||
| Severity: | high | Docs Contact: | |||||||
| Priority: | high | ||||||||
| Version: | 3.0 | CC: | petrides, pstadt, riel | ||||||
| Target Milestone: | --- | ||||||||
| Target Release: | --- | ||||||||
| Hardware: | s390x | ||||||||
| OS: | Linux | ||||||||
| Whiteboard: | |||||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||||
| Doc Text: | Story Points: | --- | |||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | 2004-11-08 16:55:49 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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*** Bug 110943 has been marked as a duplicate of this bug. *** strace ls /proc
open("/proc", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 3
fstat(3, {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
getdents(3, /* 35 entries */, 993) = 992
lseek(3, 28, SEEK_SET) = 28
getdents(3, /* 37 entries */, 993) = 984
lseek(3, 267, SEEK_SET) = 267
getdents(3, /* 20 entries */, 993) = 480
getdents(3, /* 1 entries */, 993) = 24
getdents(3, /* 0 entries */, 993) = 0
close(3) = 0
The root cause is that root directory of /proc defaults to generic lseek, which simply changes filp->f_pos. However, fs/proc/base.c:get_pid_list caches current position in a private cursor, which generic lseek does not clear. Seeking the root of /proc is broken thus on all architectures, but only s390x seeks when reading. This is something to be investigated. A simplistic fix would be to reset the cursor on any seek, but it may have performance implications. Created attachment 96206 [details]
Simplistic fix (tested)
Created attachment 96218 [details]
Take 2, telldir works
Modified in 2.4.21-5.EL Where can I find 2.4.21-5.EL to test / when and where will it be available? All errata tests are available in the "Sushi" RHN channel. Please contanct your TAM for the access details. Additionally, this fix is included into a periodic update RHEL 3 U1, which will be available shortly. If urgent resulution is needed and RHN access is not practical, I suggest rebuilding from source, using the patch attached to the comment #5. Tested: Problem is fixed in RHEL 3 U1. Sorry for the long delay, thought this was closed long ago :-( An errata has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2004-017.html |
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5) Gecko/20031120 Firebird/0.7 Description of problem: After installation of the system some (not all) running processes are not listed with ps aux or top. They are not visible in the /proc-Filesystem either. However they are running, as can be proven with netstat: [root@host proc]# netstat -anp Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program +name tcp 0 0 0.0.0.0:32768 0.0.0.0:* LISTEN - tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN - tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN - tcp 0 0 0.0.0.0:631 0.0.0.0:* LISTEN - tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN - tcp 0 0 172.17.15.2:22 172.17.15.1:2095 ESTABLISHED 766/0 udp 0 0 0.0.0.0:32768 0.0.0.0:* - udp 0 0 0.0.0.0:772 0.0.0.0:* - udp 0 0 0.0.0.0:111 0.0.0.0:* - udp 0 0 0.0.0.0:631 0.0.0.0:* - Active UNIX domain sockets (servers and established) Proto RefCnt Flags Type State I-Node PID/Program name Path unix 7 [ ] DGRAM 761 - /dev/log unix 2 [ ] DGRAM 1096 742/crond unix 2 [ ] DGRAM 1079 - unix 2 [ ] DGRAM 1065 - unix 2 [ ] DGRAM 813 - unix 2 [ ] DGRAM 769 - As you can see, there are no PIDs for the listening processes. But they are listening and answering on the open ports (verified mit cupsd and ssh). Version-Release number of selected component (if applicable): kernel-2.4.21-4.EL How reproducible: Always Steps to Reproduce: 1. install RHAS3 64bit on IBM zSeries 2. select only 'system-tools', 'admin-tools', 'network-server' 3. reboot as often as you want Additional info: