Date: Wed, 23 May 2001 17:46:57 -0700 (PDT) From: John Baldwin <jhb@FreeBSD.org> To: The Hermit Hacker <scrappy@hub.org> Cc: freebsd-current@FreeBSD.org Subject: RE: Tonights panic: free_newdirblk+0x73: movl %eax,0x10(%e Message-ID: <XFMail.010523174657.jhb@FreeBSD.org> In-Reply-To: <Pine.BSF.4.33.0105232129540.436-100000@mobile.hub.org>
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On 24-May-01 The Hermit Hacker wrote: > > Just upgraded to latest sources, doesn't look like the swap issue ... was > performing a 'make -j16 buildworld' when it panic'd ... > > > Fataltrap 12: page fault while in kernel mode > cpuid = 0; lapic.id = 00000000 > fault virtual address = 0x12 > fault code = supervisor write, page not present > instruction pointer = 0x8:0xc020abff > stack pointer = 0x10:0xcb75dbbc > frame pointer = 0x10:0xcb75dbc4 > code segmnt = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, def32 1, gran 1 > processor eflags = interrupt enabled, resume, IOPL = 0 > current process = 17 (swi3: cambio) > kernel: type 12 trap, code=0 > Stopped at free_newdirblk+0x73: movl %eax,0x10(%edx) Looks like %edx is 0x2 then. In other post, the faulting va was 0x11 with the same instruction, meaning that %edx is 0x1. So it looks like it isn't a NULL pointer dereference. It may be related to the VM stuff in that it may be that a buffer is being manipulated somewhere without Giant being held while being manipulated with Giant being held somewhere else? Or it could be a softupdates bug. :-P Is this an SMP machine? Ah, yes it is. Next time you see this, can you display 'show pcpu' for each CPU (show pcpu does the current cpu, show cpu <some decimal number> displays the info on CPU <some decimal number>). Also, can you get a backtrace of each process that is running? trace on x86 can take the pid of a process to get a backtrace of as a parameter, and the show pcpu commands should show you what process was executing on the other CPU (including its pid). > db> trace > free_newdirblk+0x73 > handle_written_inodeblock+0x29e > softdep_disk_write_complete+0x6a > bufdone+0xbc > bufdonebio+0xf > dadone+0x214 > camisr+0x1d7 > ithread_lopp+0x330 > fork_exit+0xbc > fork_trampoline+0x8 -- John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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