Date: Mon, 21 Jan 2002 17:29:20 +0100 From: Bernd Walter <ticso@cicely8.cicely.de> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: freebsd-alpha@FreeBSD.ORG Subject: Re: 4.5-RC panic Message-ID: <20020121172920.U58301@cicely8.cicely.de> In-Reply-To: <15436.8686.765933.505738@grasshopper.cs.duke.edu> References: <20020121035556.D58301@cicely8.cicely.de> <15436.8686.765933.505738@grasshopper.cs.duke.edu>
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On Mon, Jan 21, 2002 at 09:13:02AM -0500, Andrew Gallatin wrote: > > Bernd Walter writes: > > (kgdb) bt > > #0 0xfffffc000037fdc0 in dumpsys () at ../../kern/kern_shutdown.c:472 > > #1 0xfffffc000037f988 in boot (howto=256) at ../../kern/kern_shutdown.c:313 > > #2 0xfffffc00003801d0 in panic (fmt=0xfffffc000051c3dc "trap") at ../../kern/kern_shutdown.c:581 > > #3 0xfffffc00004dba60 in trap (a0=4833124384, a1=4832532772, a2=0, entry=2, framep=0xfffffe00071d3a40) > > at ../../alpha/alpha/trap.c:551 > > #4 0xfffffc00004cd97c in XentMM () > > #5 0xfffffc00004dbcc4 in syscall (code=344, framep=0xfffffe00071d3ee0) at ../../alpha/alpha/trap.c:655 > > > > dmesg: > > <...> > > > fatal kernel trap: > > > > trap entry = 0x2 (memory management fault) > > a0 = 0x12013a020 > > a1 = 0x1 > > a2 = 0x0 > > pc = 0xfffffc00004d035c > > ra = 0xfffffc00004dbcc4 > > curproc = 0xfffffe0005c6efc0 > > pid = 268, comm = tcsh > > Truly bizzare. Its trap'ping on what looks like user-space address > somewhere in the user proc's heap. a2 is 0, so its a load. What > pointer had this value? > > The syscall in question (344) is sigreturn. I haven't been keeping up > with committers in the last few months. Has anything changed lately > wrt. signal delivery? I did not follow the -stable commits regulary so I can't say. The box has some memory load so I wouldn't be surprised if the complete tcsh was swapped. > Can you disassemble this and see if its faulting on the call or the return? int sigreturn(struct proc *p, struct sigreturn_args /* { ucontext_t *sigcntxp; } */ *uap) { fffffc00004d0354: 09 04 f0 47 mov a0,s0 ucontext_t uc, *ucp; struct pcb *pcb; unsigned long val; if (((struct osigcontext*)uap->sigcntxp)->sc_regs[R_ZERO] == 0xACEDBADE) fffffc00004d0358: 00 00 31 a4 ldq t0,0(a1) fffffc00004d035c: 18 01 41 a4 ldq t1,280(t0) fffffc00004d0360: de ba 3f 20 lda t0,-17698(zero) fffffc00004d0364: ee ac 21 24 ldah t0,-21266(t0) fffffc00004d0368: 21 f6 21 48 zapnot t0,0xf,t0 fffffc00004d036c: a2 05 41 40 cmpeq t1,t0,t1 fffffc00004d0370: 03 00 40 e4 beq t1,fffffc00004d0380 <sigreturn+0x40> return osigreturn(p, (struct osigreturn_args *)uap); fffffc00004d0374: a4 ff 5f d3 bsr ra,fffffc00004d0208 <osigreturn+0x8> fffffc00004d0378: 43 00 e0 c3 br fffffc00004d0488 <sigreturn+0x148> fffffc00004d037c: 00 00 e0 2f unop ucp = uap->sigcntxp; pcb = &p->p_addr->u_pcb; -- B.Walter COSMO-Project http://www.cosmo-project.de ticso@cicely.de Usergroup info@cosmo-project.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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