Date: Sun, 8 Jun 2014 21:22:07 -0700 From: John-Mark Gurney <jmg@funkthat.com> To: Alan Cox <alc@rice.edu> Cc: alc@freebsd.org, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: svn commit: r266850 - in head/sys/arm/xscale: i80321 i8134x ixp425 pxa Message-ID: <20140609042206.GQ31367@funkthat.com> In-Reply-To: <53950BB9.3090808@rice.edu> References: <CAJ-Vmo=h39AYXhPFBx7dzUe%2BQtksPB8QMaAQcoqoM6UiKZe2XA@mail.gmail.com> <20140529173803.GA5294@ci0.org> <20140530063228.GD43976@funkthat.com> <5388ABF1.3030200@rice.edu> <20140601081153.GU43976@funkthat.com> <53935755.70908@rice.edu> <20140608003944.GK31367@funkthat.com> <53949D96.3060409@rice.edu> <20140608235611.GP31367@funkthat.com> <53950BB9.3090808@rice.edu>
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Alan Cox wrote this message on Sun, Jun 08, 2014 at 20:19 -0500: > On 06/08/2014 18:56, John-Mark Gurney wrote: > > Alan Cox wrote this message on Sun, Jun 08, 2014 at 12:29 -0500: > >> On 06/07/2014 19:39, John-Mark Gurney wrote: > >>> Alan Cox wrote this message on Sat, Jun 07, 2014 at 13:17 -0500: > >>>> On 06/01/2014 03:11, John-Mark Gurney wrote: > >>>>> Alan Cox wrote this message on Fri, May 30, 2014 at 11:04 -0500: > >>>>>> On 05/30/2014 01:32, John-Mark Gurney wrote: > >>>>>>> Olivier Houchard wrote this message on Thu, May 29, 2014 at 19:38 +0200: > >>>>>>>> On Thu, May 29, 2014 at 10:19:18AM -0700, Adrian Chadd wrote: > >>>>>>>>> On 29 May 2014 10:16, Olivier Houchard <cognet@ci0.org> wrote: > >>>>>>>>>> On Thu, May 29, 2014 at 10:14:53AM -0700, Adrian Chadd wrote: > >>>>>>>>>>> Have you tested this on xscale hardware? > >>>>>>>>>> Yeah, my two last commits were an attempt to get the AVILA kernel to boot > >>>>>>>>>> again. > >>>>>>>>> Woo! What can I provide to help you do this? :-) > >>>>>>>>> > >>>>>>>>> (Drinks? Food? Donations?) > >>>>>>>>> > >>>>>>>>> > >>>>>>>> Drinks and food are always appreciated ;) > >>>>>>>> It almost boots for me now, except a few userland programs gets SIGSEGV or > >>>>>>>> SIGILL along the way, trying to figure out why. > >>>>>>> Thanks for fixing ddb... I'm getting panic messages again... bad > >>>>>>> news is that my panic is still around: > >>>>>>> panic: vm_page_alloc: page 0xc07e73b0 is wired > >>>>>>> > >>>>>>> Though, interestingly, it looks like sparc64 has a similar panic: > >>>>>>> https://www.freebsd.org/cgi/query-pr.cgi?pr=187080 > >>>>>>> > >>>>>>> kib, Alan, any clue to why this is happening? Any suggestions as to > >>>>>>> help track it down? > >>>>>> I'm afraid not. The dump below shows a perfectly normal, in-use page. > >>>>>> If this page had actually been free prior to the vm_page_alloc() call, > >>>>>> then other fields, like dirty, would have been different. In other > >>>>>> words, this isn't just a problem with the wire count. > >>>>>> > >>>>>> What object is vm_page_alloc() being performed on? > >>>>> Is this enough? Or do you need more? > >>>>> > >>>>> panic: vm_page_alloc: page 0xc07e73b0 is wired, obj: 0xc1500b40 > >>>>> KDB: enter: panic > >>>>> [ thread pid 781 tid 100051 ] > >>>>> Stopped at kdb_enter+0x40: ldrb r15, [r15, r15, ror r15]! > >>>>> db> show object/f 0xc1500b40 > >>>>> Object 0xc1500b40: type=2, size=0xa, res=9, ref=0, flags=0x0 ruid -1 charge 0 > >>>>> sref=0, backing_object(0)=(0)+0x0 > >>>>> memory:=(off=0x0,page=0x8f0000),(off=0x1,page=0x8f1000),(off=0x2,page=0x8ee000),(off=0x3,page=0x8ef000),(off=0x4,page=0x8f3000),(off=0x5,page=0x8f4000) > >>>>> ...(off=0x6,page=0x8fa000),(off=0x7,page=0x8fb000),(off=0x8,page=0x8fc000) > >>>>> > >>>>> If you need more, let me know what/how to get it, and I will... > >>>>> > >>>> Anyone who has seen the "wired page" panic, please try the attached > >>>> patch. It introduces some new KASSERT()s that may help me to narrow > >>>> down the problem. I haven't been able to trigger these KASSERT()s on > >>>> amd64, but the symptoms that you guys are reporting are consistent with > >>>> a bug that would trigger these KASSERT()s. > >>> Ok, it triggered the xxx one: > >>> Starting sendmail_msp_queue. > >>> panic: vm_phys_free_contig: xxx > >>> KDB: enter: panic > >>> [ thread pid 782 tid 100051 ] > >>> Stopped at kdb_enter+0x40: ldrb r15, [r15, r15, ror r15]! > >>> db> bt > >>> Tracing pid 782 tid 100051 td 0xc1470000 > >>> db_trace_self() at db_trace_self > >>> pc = 0xc0566ec8 lr = 0xc0566f54 (db_trace_thread+0x50) > >>> sp = 0xcd830850 fp = 0xc03db694 > >>> db_trace_thread() at db_trace_thread+0x50 > >>> pc = 0xc0566f54 lr = 0xc022cd14 (db_command_init+0x620) > >>> sp = 0xcd8308b0 fp = 0xc03db694 > >>> db_command_init() at db_command_init+0x620 > >>> pc = 0xc022cd14 lr = 0xc022c3ec (db_skip_to_eol+0x480) > >>> sp = 0xcd8308c8 fp = 0xc03db694 > >>> r4 = 0xc0683c30 r5 = 0x00000000 > >>> db_skip_to_eol() at db_skip_to_eol+0x480 > >>> pc = 0xc022c3ec lr = 0xc022c554 (db_command_loop+0x5c) > >>> sp = 0xcd830968 fp = 0xc03db694 > >>> r4 = 0xcd83097c r5 = 0xc0683efc > >>> r6 = 0x00000000 r7 = 0x00000000 > >>> r8 = 0x00000001 r10 = 0x600000d3 > >>> db_command_loop() at db_command_loop+0x5c > >>> pc = 0xc022c554 lr = 0xc022e99c (X_db_sym_numargs+0xec) > >>> sp = 0xcd830970 fp = 0xc03db694 > >>> X_db_sym_numargs() at X_db_sym_numargs+0xec > >>> pc = 0xc022e99c lr = 0xc03db8c4 (kdb_trap+0x94) > >>> sp = 0xcd830a88 fp = 0xc03db694 > >>> r4 = 0x00000000 > >>> kdb_trap() at kdb_trap+0x94 > >>> pc = 0xc03db8c4 lr = 0xc0578eb0 (undefinedinstruction+0x2c8) > >>> sp = 0xcd830aa8 fp = 0xc03db694 > >>> r4 = 0x00000000 r5 = 0x00000000 > >>> r6 = 0x00000000 r7 = 0xcd830b20 > >>> r8 = 0xe7ffffff r10 = 0xe7ffffff > >>> undefinedinstruction() at undefinedinstruction+0x2c8 > >>> pc = 0xc0578eb0 lr = 0xc0568a0c (exception_exit) > >>> sp = 0xcd830b20 fp = 0xc0613e70 > >>> r4 = 0xffffffff r5 = 0xffff1004 > >>> r6 = 0xc06d0ebc r7 = 0xcd830ba4 > >>> r8 = 0xc1470000 r9 = 0x00000013 > >>> r10 = 0x00000010 > >>> exception_exit() at exception_exit > >>> pc = 0xc0568a0c lr = 0xc03db68c (kdb_enter+0x38) > >>> sp = 0xcd830b70 fp = 0xc0613e70 > >>> r0 = 0x00000012 r1 = 0x60000013 > >>> r2 = 0xc06df2ac r3 = 0xc06d0ee8 > >>> r4 = 0xc05e5258 r5 = 0xc06155e8 > >>> r6 = 0xc06d0ebc r7 = 0xcd830ba4 > >>> r8 = 0xc1470000 r9 = 0x00000013 > >>> r10 = 0x00000010 r12 = 0xc05e2518 > >>> kdb_enter() at kdb_enter+0x44 > >>> pc = 0xc03db698 lr = 0xc03aa094 (kern_reboot+0x948) > >>> sp = 0xcd830b78 fp = 0xc0613e70 > >>> r4 = 0x00000100 > >>> kern_reboot() at kern_reboot+0x948 > >>> pc = 0xc03aa094 lr = 0xc03aa164 (kassert_panic+0x68) > >>> sp = 0xcd830b90 fp = 0xc0613e70 > >>> r4 = 0xc06155e8 r5 = 0xc07e74a0 > >>> r6 = 0xc07e6fa0 r7 = 0x00000004 > >>> r8 = 0x00000010 > >>> kassert_panic() at kassert_panic+0x68 > >>> pc = 0xc03aa164 lr = 0xc055a0a8 (vm_phys_free_contig+0x8c) > >>> sp = 0xcd830bb0 fp = 0xc0613e70 > >>> r0 = 0xc06155e8 r1 = 0xc07e6d20 > >>> r2 = 0xc06e6a70 r3 = 0x00000000 > >>> r4 = 0xc07e73b0 > >>> vm_phys_free_contig() at vm_phys_free_contig+0x8c > >>> pc = 0xc055a0a8 lr = 0xc055ca70 (vm_reserv_startup+0x4bc) > >>> sp = 0xcd830bd0 fp = 0xc0613e70 > >>> r4 = 0xc08fb2cc r5 = 0x00000008 > >>> r6 = 0x000000e8 r7 = 0xc08fb280 > >>> r8 = 0x00000005 r10 = 0x00000001 > >>> vm_reserv_startup() at vm_reserv_startup+0x4bc > >>> pc = 0xc055ca70 lr = 0xc055cb40 (vm_reserv_startup+0x58c) > >>> sp = 0xcd830be8 fp = 0xc0613e70 > >>> r4 = 0xc08fb280 r5 = 0x00000000 > >>> r6 = 0xc14b7280 r7 = 0x00000040 > >>> r8 = 0x00000000 > >>> vm_reserv_startup() at vm_reserv_startup+0x58c > >>> pc = 0xc055cb40 lr = 0xc055ce08 (vm_reserv_reclaim_inactive+0x34) > >>> sp = 0xcd830bf0 fp = 0xc0613e70 > >>> r4 = 0xc06e6550 > >>> vm_reserv_reclaim_inactive() at vm_reserv_reclaim_inactive+0x34 > >>> pc = 0xc055ce08 lr = 0xc0554cb8 (vm_page_alloc+0x280) > >>> sp = 0xcd830bf8 fp = 0xc0613e70 > >>> vm_page_alloc() at vm_page_alloc+0x280 > >>> pc = 0xc0554cb8 lr = 0xc0540eb0 (vm_fault_hold+0x60c) > >>> sp = 0xcd830c30 fp = 0xcd830dac > >>> r4 = 0xc14b7280 r5 = 0xc0618d00 > >>> r6 = 0xcd830eb0 r7 = 0xc1470000 > >>> r8 = 0xcd830e60 r9 = 0x00000000 > >>> r10 = 0x00000000 > >>> vm_fault_hold() at vm_fault_hold+0x60c > >>> pc = 0xc0540eb0 lr = 0xc05426b8 (vm_fault+0x44) > >>> sp = 0xcd830db0 fp = 0x00000002 > >>> r4 = 0xc14c8a0c r5 = 0xc0618d00 > >>> r6 = 0xcd830eb0 r7 = 0xc1470000 > >>> r8 = 0xcd830e60 r9 = 0x00000001 > >>> r10 = 0x00000000 > >>> vm_fault() at vm_fault+0x44 > >>> pc = 0xc05426b8 lr = 0xc05782d0 (data_abort_handler+0x35c) > >>> sp = 0xcd830dc0 fp = 0x00000002 > >>> data_abort_handler() at data_abort_handler+0x35c > >>> pc = 0xc05782d0 lr = 0xc0568a0c (exception_exit) > >>> sp = 0xcd830dc0 fp = 0x00000002 > >>> data_abort_handler() at data_abort_handler+0x35c > >>> pc = 0xc05782d0 lr = 0xc0568a0c (exception_exit) > >>> sp = 0xcd830e60 fp = 0x20c43000 > >>> r4 = 0xffffffff r5 = 0xffff1004 > >>> r6 = 0x00000000 r7 = 0x20443740 > >>> r8 = 0x0009b8e4 r9 = 0x00000001 > >>> r10 = 0x00000004 > >>> exception_exit() at exception_exit > >>> pc = 0xc0568a0c lr = 0x204140d0 (0x204140d0) > >>> sp = 0xcd830eb0 fp = 0x20c43000 > >>> r0 = 0x00000000 r1 = 0x20c4302c > >>> r2 = 0x00000004 r3 = 0x00000000 > >>> r4 = 0x20446190 r5 = 0x20c4302c > >>> r6 = 0x00000000 r7 = 0x20443740 > >>> r8 = 0x0009b8e4 r9 = 0x00000001 > >>> r10 = 0x00000004 r12 = 0x00000001 > >>> Unable to unwind into user mode > >>> > >>> Hope this helps, let me know if you need anything else... > >>> > >> Please try the attached patch. It adds another KASSERT() loop. > >> > >> Depending on which KASSERT() fires, that will tell us whether to look > >> deeper at this function or its caller for the source of the problem. > > Ok, that panic is: > > panic: vm_phys_free_contig: start 0xc07e6d20 21 24 > > > > Let me know if you need any more info... oh, btw, the last %u needed > > to be %lu since it was a u_long, not an unsigned... > > > > Ok. Here is the next debug patch. so, it's crashing in the same place: panic: vm_phys_free_contig: start 0xc07e6d20 21 24 so, I commented out this KASSERT, and now it panics with: panic: vm_phys_free_contig: xxx 0xc07e6fa0 13 16 so I commented out this KASSERT too, and it panics back w/ the original panic.. So it didn't hit the new KASSERT in vm_reserv_break... -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."
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