1.194. strace

An updated strace package that fixes a bug when tracing a program that blocks the SIGTRAP signal is now available.

The strace program intercepts and records the system calls called and received by a running process. Strace can print a record of each system call, its arguments and its return value.

This updated strace package fixes the following bug:

* the kernel does not send SIGTRAP notifications to strace after an execve system call finishes. Consequently, when "strace -f" was executed against a program that blocked the SIGTRAP signal and subsequently called execve, strace sent a "[preattached child 0 of 12166 in weird state!]" message to STD OUT and hung. With this update, strace now checks for this situation and re-synchronizes with system call notifications when necessary. Note: this problem only presents on Itanium-based systems (BZ#548363)

All strace users are advised to upgrade to this updated package, which resolves this issue.

An updated strace package that fixes two bugs is now available.

The strace program intercepts and records the system calls called and received by a running process. Strace can print a record of each system call, its arguments and its return value.

This updated strace package fixes the following bugs:

* when an strace process was terminated by a signal while the tracee was executing a fork or clone system call the tracee was forcefully terminated instead of being cleanly detached. This update corrects this: tracees are now cleanly detached as expected when an strace process is terminated in the circumstance noted above. (BZ#558471)

* RHBA-2010:0047, the strace update released to address BZ#548363, uncovered a race condition on Itanium-based systems. (See References below for a link to this previous release.) The race condition presented when strace attached to a process while said process was executing the execve system call. With this update, strace now reliably detects this post-execve trap and, consequently, avoids the race condition. (BZ#564364)