Date: Wed, 14 Nov 2001 10:45:10 -0500 (EST) From: Joe Clarke <marcus@marcuscom.com> To: freebsd-hackers@freebsd.org Subject: Possible pthread bug Message-ID: <20011114103543.D3241-100000@shumai.marcuscom.com>
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I've been trying to track down some kernel errors I've been seeing on my -stable box for a while now with no luck. Admittedly, I don't know much about the internals of threads. I'm hoping someone can point me in the right direction. I have a few applications that are generating SIGABRTs in uthread_kern.c with the message: Thread has returned from sigreturn or longjmp This is a direct result of sigreturn() failing(?) to set eflags in machdep.c at line 950. I know this because everytime I see the SIGABRT and the uthread_kern message, I also see: sigreturn: eflags = 0x280 Where the eflags value is different each time. Now, if I comment out the return(EINVAL); in sigreturn(), things work. That is, I don't get the crash, but I do get the eflags kernel message. I know this is a terrible fix, but I just don't know where to go from here. It seems to me that what's going on here is a previous thread's context is trying to be restored after returning from a signal. That's failing because eflags can't be set. This doesn't seem like an application bug to me, but I could be wrong. I'm running -stable: FreeBSD shumai.marcuscom.com 4.4-STABLE FreeBSD 4.4-STABLE #0: Wed Nov 14 02:21:53 EST 2001 marcus@shumai.marcuscom.com:/usr/src/sys/compile/SHUMAI i386 and the apps in question are nautilus and balse. However, I've walked through the failing apps, and can't find anything amiss. Core dumps and gdb aren't very helpful. I've asked a similar question on -stable, but only got some comiseration. I'd really appreciate any help or insight someone could give. Thanks. Joe To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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