Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.
RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Bug 1845463

Summary: glibc: Support calling ctime, localtime etc. after multi-threaded fork
Product: Red Hat Enterprise Linux 8 Reporter: Suma G <suma.gangarapu>
Component: glibcAssignee: glibc team <glibc-bugzilla>
Status: CLOSED UPSTREAM QA Contact: qe-baseos-tools-bugs
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 8.2CC: ashankar, codonell, dj, fweimer, mnewsome, pfrankli, sipoyare
Target Milestone: rcFlags: pm-rhel: mirror+
Target Release: 8.0   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-06-09 11:42:46 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Suma G 2020-06-09 10:00:00 UTC 
Description of problem: Child process is hung at  __lll_lock_wait_private ()

(gdb) bt
#0  0x00007f88c393258c in __lll_lock_wait_private () from /lib64/libc.so.6
#1  0x00007f88c38e17f6 in __tz_convert () from /lib64/libc.so.6
#2  0x00007f88c38dfc8d in ctime () from /lib64/libc.so.6
#3  0x00007f88c07757bc in CSLDebug_FormatCurrentTime () from /opt/dell/srvadmin/lib64/libstorelib.so
#4  0x00007f88c0775c32 in CSLDebug_Write () from /opt/dell/srvadmin/lib64/libstorelib.so
#5  0x00007f88c0775ffd in DebugLog () from /opt/dell/srvadmin/lib64/libstorelib.so
#6  0x00007f88c0762043 in child () from /opt/dell/srvadmin/lib64/libstorelib.so
#7  0x00007f88c0765e0b in InitiateChildEventProcess () from /opt/dell/srvadmin/lib64/libstorelib.so
#8  0x00007f88c0762bfe in RegisterMonitorSignal () from /opt/dell/srvadmin/lib64/libstorelib.so
#9  0x00007f88c0764f02 in SetupAenHandler () from /opt/dell/srvadmin/lib64/libstorelib.so
#10 0x00007f88c0776d67 in CAenRegistration_InitAEN () from /opt/dell/srvadmin/lib64/libstorelib.so
#11 0x00007f88c0776f14 in CAenRegistration_Register () from /opt/dell/srvadmin/lib64/libstorelib.so
#12 0x00007f88c0768e19 in RegisterAEN () from /opt/dell/srvadmin/lib64/libstorelib.so
#13 0x00007f88c0768e54 in RegisterForAEN () from /opt/dell/srvadmin/lib64/libstorelib.so
#14 0x00007f88c0773256 in ProcessLibCommand () from /opt/dell/srvadmin/lib64/libstorelib.so
#15 0x00007f88c09b0ba2 in SASStartAEN () at /root/OpenManage/ARCH_FOR_BUILD/64/MACHINE/RHEL8/OM950/OMSS/omss_src/omss_Llayers/vil/sasvil/sasaen.cpp:507
#16 0x00007f88c09b1331 in AenStart (mem_ptr=0x7f88a4056e50, pTimeValue=0x7f88a4056e00)
    at /root/OpenManage/ARCH_FOR_BUILD/64/MACHINE/RHEL8/OM950/OMSS/omss_src/omss_Llayers/vil/sasvil/sasaen.cpp:7304
#17 0x00007f88c09a914f in BtmWorkItemProcessingTask (pSMThreadData=<optimized out>)
    at /root/OpenManage/ARCH_FOR_BUILD/64/MACHINE/RHEL8/OM950/OMSS/omss_src/omss_Llayers/vil/sasvil/sasaen.cpp:1091
#18 0x00007f88c41792de in start_thread () from /lib64/libpthread.so.0
#19 0x00007f88c3924e83 in clone () from /lib64/libc.so.6


Version-Release number of selected component (if applicable):
Red Hat Enterprise Linux 8.2-8.el8

How reproducible: Not known

Expected results: should not hang under ctime()
Comment 1 Florian Weimer 2020-06-09 11:42:46 UTC 
ctime is not an async-signal-safe function, so POSIX does not allow calling it after a multi-threaded process has forked.

I filed an upstream enhancement request: https://sourceware.org/bugzilla/show_bug.cgi?id=26097

We will evaluate a potential backport if this issue has been addressed in upstream glibc.