Date: Mon, 9 Jun 2014 10:44:31 -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: <20140609174431.GT31367@funkthat.com> In-Reply-To: <5395E725.7020807@rice.edu> References: <20140601081153.GU43976@funkthat.com> <53935755.70908@rice.edu> <20140608003944.GK31367@funkthat.com> <53949D96.3060409@rice.edu> <20140608235611.GP31367@funkthat.com> <53950BB9.3090808@rice.edu> <20140609042206.GQ31367@funkthat.com> <5395D312.5000302@rice.edu> <20140609163302.GS31367@funkthat.com> <5395E725.7020807@rice.edu>
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Alan Cox wrote this message on Mon, Jun 09, 2014 at 11:56 -0500: > On 06/09/2014 11:33, John-Mark Gurney wrote: > > Alan Cox wrote this message on Mon, Jun 09, 2014 at 10:30 -0500: > >> On 06/08/2014 23:22, John-Mark Gurney wrote: > >>> 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... > >> Next patch...It should panic in vm_reserv_break this time and tell me if > >> the reservation being broken belongs to the same object as the inuse > >> page that is being inappropriately freed. > > So, bad news... still panics with: > > panic: vm_phys_free_contig: start 0xc07e6d20 21 24 > > > > This panic seems to be consistent now, in that the start address is > > always the same... Is there a way you could add various debugging > > for this specific vm page to catch a stack trace (stack(9)) where it's > > going wrong? > > > > I made a mistake with the new KASSERT()s in vm_reserv_break(). Try this. No worried, the new patch panics: panic: vm_reserv_break: 2 saved_object=0xc06e6378 x=253 m_tmp->object=0xc06e6378 (1) w/ a bt of: [...] vm_reserv_startup() at vm_reserv_startup+0x570 pc = 0xc055cd94 lr = 0xc055cec8 (vm_reserv_startup+0x6a4) sp = 0xcd833be8 fp = 0xc06142d0 r4 = 0xc08fb280 r5 = 0x00000000 r6 = 0xc14b76e0 r7 = 0x00000000 r8 = 0x00000000 r9 = 0x00000033 r10 = 0x00000001 vm_reserv_startup() at vm_reserv_startup+0x6a4 pc = 0xc055cec8 lr = 0xc055d190 (vm_reserv_reclaim_inactive+0x34) sp = 0xcd833bf0 fp = 0xc06142d0 r4 = 0xc06e6550 vm_reserv_reclaim_inactive() at vm_reserv_reclaim_inactive+0x34 pc = 0xc055d190 lr = 0xc0554eb0 (vm_page_alloc+0x280) sp = 0xcd833bf8 fp = 0xc06142d0 vm_page_alloc() at vm_page_alloc+0x280 pc = 0xc0554eb0 lr = 0xc0540ebc (vm_fault_hold+0x60c) sp = 0xcd833c30 fp = 0xcd833dac r4 = 0xc14b76e0 r5 = 0xc0619288 r6 = 0xcd833eb0 r7 = 0xc0f7ec80 r8 = 0xcd833e60 r9 = 0x00000000 r10 = 0x00000000 vm_fault_hold() at vm_fault_hold+0x60c pc = 0xc0540ebc lr = 0xc05426c4 (vm_fault+0x44) sp = 0xcd833db0 fp = 0x00000002 r4 = 0xc14c66ec r5 = 0xc0619288 r6 = 0xcd833eb0 r7 = 0xc0f7ec80 r8 = 0xcd833e60 r9 = 0x00000001 r10 = 0x00000000 vm_fault() at vm_fault+0x44 pc = 0xc05426c4 lr = 0xc05786d0 (data_abort_handler+0x35c) sp = 0xcd833dc0 fp = 0x00000002 data_abort_handler() at data_abort_handler+0x35c pc = 0xc05786d0 lr = 0xc0568dc8 (exception_exit) sp = 0xcd833e60 fp = 0x00000000 r4 = 0xffffffff r5 = 0xffff1004 r6 = 0x001b7740 r7 = 0x00052ec4 r8 = 0x00000000 r9 = 0x000cc4b0 r10 = 0x00000000 exception_exit() at exception_exit pc = 0xc0568dc8 lr = 0x203f1208 (0x203f1208) sp = 0xcd833eb0 fp = 0x00000000 r0 = 0x20c53e60 r1 = 0x00000000 r2 = 0x000eeb40 r3 = 0x00000001 r4 = 0x00000000 r5 = 0x000e9654 r6 = 0x001b7740 r7 = 0x00052ec4 r8 = 0x00000000 r9 = 0x000cc4b0 r10 = 0x00000000 r12 = 0x200d26a4 Let me know if you need any more information.. Thanks for tracking this down. -- 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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