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[Bug nptl/2748] New: Cancel from printf not calling the cancel handler
- From: "sjmunroe at us dot ibm dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 9 Jun 2006 22:10:02 -0000
- Subject: [Bug nptl/2748] New: Cancel from printf not calling the cancel handler
- Reply-to: sourceware-bugzilla at sourceware dot org
Found this problem debug failure reported by our cluster team. If we are
PTHREAD_CANCEL_ENABLE, PTHREAD_CANCEL_DEFERRED and pthread_cancel is called
while a thread is waiting on a pthread_rwlock the cancelation will be defered
until the threads wakes up (whoever is holding the lock does
pthread_rwlock_unlock().
In this case the thread holding the lock is signaled, runs its cancle handler
and unlocks. One of the waiting threads wakes up and calls printf (which is a
cancellation point). We expect printf (vfprintf) to detect that cancellation is
pending and initiate cancel handling (including calling this threads cancel
handler).
Instead we that thread exiting prematurely (from start_thread,
__exit_thread_inline(0). This leave other threads hung waiting on the
pthread_rwlock and the main thread waiting on pthread_join.
--
Summary: Cancel from printf not calling the cancel handler
Product: glibc
Version: 2.4
Status: NEW
Severity: critical
Priority: P1
Component: nptl
AssignedTo: drepper at redhat dot com
ReportedBy: sjmunroe at us dot ibm dot com
CC: glibc-bugs at sources dot redhat dot com
GCC build triplet: i568-unknown-linux-gnu, powerpc64-unknown-linux-gnu,
powerpc32-u
GCC host triplet: i568-unknown-linux-gnu, powerpc64-unknown-linux-gnu,
powerpc32-u
GCC target triplet: i568-unknown-linux-gnu, powerpc64-unknown-linux-gnu,
powerpc32-u
http://sourceware.org/bugzilla/show_bug.cgi?id=2748
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