Date: Mon, 03 Apr 2006 18:53:18 +0900 From: Ganbold <ganbold@micom.mng.net> To: Robert Watson <rwatson@FreeBSD.org> Cc: freebsd-current@freebsd.org Subject: Re: page fault on today's CURRENT (tcp_usr_accept) Message-ID: <4430F08E.5080602@micom.mng.net> In-Reply-To: <20060403100516.C76562@fledge.watson.org> References: <4430DF4E.1060600@micom.mng.net> <20060403100516.C76562@fledge.watson.org>
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Robert Watson wrote: > > On Mon, 3 Apr 2006, Ganbold wrote: > >> I've got page fault on today's CURRENT. >> >> Fatal trap 12: page fault while in kernel mode >> fault virtual address = 0xa0 >> fault code = supervisor write, >> page not present >> instructon pointer = 0x20: 0xc062bbde >> stack pointer = 0x28: 0xcc8efc10 >> frame pointer = 0x28: 0xcc8efc2c >> code segment = base 0x0, limit 0xfffff, >> type 0x1b >> =DPL 0, pres 1, >> def32 1, gran 1 >> processor eflags = interrupt enabled, resume, >> IOPL = 0 >> current process = 435 (smbd) >> [thread pid 435 tid 100039] >> stopped at tcp_usr_accept+0xd6: cmpxchgl %ecx, 0xa0(%ebx) >> >> I'm running samba (samba-3.0.21b,1) on this test machine and there is >> no load. >> >> FreeBSD gw.micom.mng.net 7.0-CURRENT FreeBSD 7.0-CURRENT #16: Mon >> Apr 3 14:15:48 ULAST 2006 >> tsgan@gw.micom.mng.net:/usr/obj/usr/src/sys/GW i386 > > Is there any chance you can extract a stack trace, as well as file > names and line numbers for the trace? If you have a core, could I get > you to dump the state from the relevant frames? The above looks like > a NULL pointer derefernece in tcp_usr_accept(). Since I've moderately > exercised the accept() path on TCP, it's presumably a race condition > of some sort. When I try to browse samba directory from network, above error occurs and the trace is: db>trace Tracing pid 1051 tid 100053 td 0xc224fbd0 tcp_usr_accept(c23d167c,cc916c54,cc916c58,cc916c7c,c05a8398) at tcp_usr_accept+0xd6 soaccept(c23d176c,cc916c54,c24f5300,0,0) at soaccept+0x7d accept1(c224fbd0,cc916d04,0,cc916d30,c06da93e) at accept1+0x458 accept(c224fbd0, cc916d04,3,246,c077bce8) at accept+0x10 syscall(849003b,849003b,bfbf003b,0,15) at syscall+0x2ee Xint0x80_syscall() at Xint0x80_syscall+0x1f --- syscall (30, FreeBSD ELF32, accept), eip = 0x28715a33, esp = 0xbfbfd91c, ebp = 0xbfbfec28 --- Ganbold > > Thanks! > > Robert N M Watson > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to > "freebsd-current-unsubscribe@freebsd.org" > > >
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