Date: Sat, 23 Jan 1999 19:13:27 +0000 (GMT) From: Doug Rabson <dfr@nlsystems.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Peter Wemm <peter@netplex.com.au>, current@FreeBSD.ORG Subject: Re: panic: found dirty cache page 0xf046f1c0 Message-ID: <Pine.BSF.4.01.9901231912070.59627-100000@herring.nlsystems.com> In-Reply-To: <199901231906.LAA48145@apollo.backplane.com>
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On Sat, 23 Jan 1999, Matthew Dillon wrote: > > :I made it happen again by doing the same installworld but this time I > :caught it in the debugger. I'll leave the machine up for a while in case > :someone has some idea of how to debug it. The stacktrace looks like this: > : > :#0 Debugger () at ../../alpha/alpha/db_interface.c:260 > :#1 0xfffffc000036c2c0 in panic () at ../../kern/kern_shutdown.c:444 > :#2 0xfffffc00004942fc in vm_page_alloc () at ../../vm/vm_page.c:1041 > :#3 0xfffffc00003a1b54 in allocbuf () at ../../kern/vfs_bio.c:1791 > > The panic message should be printing the address of the vm_page_t that > it caught. > > From the debugger, dump that vm_page_t with 'print'. > > print *0xADDRESS > > Do about 8 print's bumping the address by 4 ( in hex ) for each. > > It would be even better if we could figure out the contents and type > of the underlying object. I have full symbols: (gdb) fr 2 #2 0xfffffc00004942fc in vm_page_alloc () at ../../vm/vm_page.c:1041 1041 panic("found dirty cache page %p", m); (gdb) l 1036 */ 1037 1038 if (qtype == PQ_CACHE) { 1039 #if !defined(MAX_PERF) 1040 if (m->dirty) 1041 panic("found dirty cache page %p", m); 1042 1043 #endif 1044 vm_page_busy(m); 1045 vm_page_protect(m, VM_PROT_NONE); (gdb) p m $4 = (struct vm_page *) 0xfffffe0000108f40 (gdb) p *m $5 = {pageq = {tqe_next = 0x0, tqe_prev = 0xfffffc000052ecc8}, hnext = 0x0, listq = {tqe_next = 0xfffffe0000090fe0, tqe_prev = 0xfffffe00000bb6b8}, object = 0xfffffe00050e2a10, pindex = 12, phys_addr = 88940544, queue = 172, flags = 128, pc = 41, wire_count = 0, hold_count = 0, act_count = 5 '\005', busy = 0 '\000', valid = 65535, dirty = 65535} -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 442 9037 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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