From: Max Krummenacher <max.oss.09@gmail•com>
To: Ard Biesheuvel <ardb@kernel•org>,
Naresh Kamboju <naresh.kamboju@linaro•org>
Cc: Linux ARM <linux-arm-kernel@lists•infradead.org>,
open list <linux-kernel@vger•kernel.org>,
Linux-Next Mailing List <linux-next@vger•kernel.org>,
lkft-triage@lists•linaro.org,
Stephen Rothwell <sfr@canb•auug.org.au>,
Russell King - ARM Linux <linux@armlinux•org.uk>,
Arnd Bergmann <arnd@arndb•de>,
Andrew Morton <akpm@linux-foundation•org>,
max.krummenacher@toradex•com, Shawn Guo <shawnguo@kernel•org>,
Stefano Stabellini <stefano.stabellini@xilinx•com>,
Christoph Hellwig <hch@lst•de>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle•com>,
"Eric W. Biederman" <ebiederm@xmission•com>,
"Russell King (Oracle)" <linux@armlinux•org.uk>
Subject: Re: [next] arm: boot failed - PC is at cpu_ca15_set_pte_ext
Date: Wed, 20 Apr 2022 09:50:52 +0200 [thread overview]
Message-ID: <9eb0c1a4f805a75e3e9f24dfcae3077b772a06c0.camel@gmail.com> (raw)
In-Reply-To: <CAMj1kXFKzi14UCoiDOMwS5jyNz61_UzxGXm+ke0EWEt4nn6E1g@mail.gmail.com>
Am Mittwoch, den 20.04.2022, 09:31 +0200 schrieb Ard Biesheuvel:
> On Tue, 19 Apr 2022 at 12:59, Naresh Kamboju <naresh.kamboju@linaro•org> wrote:
> > Linux next 20220419 boot failed on arm architecture qemu_arm and BeagleBoard
> > x15 device.
> >
> > kernel crash log from x15:
> > -----------------
> > [ 6.866516] 8<--- cut here ---
> > [ 6.869598] Unable to handle kernel paging request at virtual
> > address f000e62c
> > [ 6.876861] [f000e62c] *pgd=82935811, *pte=00000000, *ppte=00000000
> > [ 6.883209] Internal error: Oops: 807 [#3] SMP ARM
> > [ 6.888000] Modules linked in:
> > [ 6.891082] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G D W
> > 5.18.0-rc3-next-20220419 #1
> > [ 6.899993] Hardware name: Generic DRA74X (Flattened Device Tree)
> > [ 6.906127] PC is at cpu_ca15_set_pte_ext+0x4c/0x58
> > [ 6.911041] LR is at handle_mm_fault+0x60c/0xed0
> > [ 6.915679] pc : [<c031f26c>] lr : [<c04cfeb8>] psr: 40000013
> > [ 6.921966] sp : f000dde8 ip : f000de44 fp : a0000013
> > [ 6.927215] r10: 00000000 r9 : 00000000 r8 : c1e95194
> > [ 6.932464] r7 : c3c95000 r6 : befffff1 r5 : 00000081 r4 : c29d8000
> > [ 6.939025] r3 : 00000000 r2 : 00000000 r1 : 00000040 r0 : f000de2c
> > [ 6.945587] Flags: nZcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
> > [ 6.952758] Control: 10c5387d Table: 8020406a DAC: 00000051
> > [ 6.958526] Register r0 information: 2-page vmalloc region starting
> > at 0xf000c000 allocated at kernel_clone+0x94/0x3b0
> > [ 6.969299] Register r1 information: non-paged memory
> > [ 6.974365] Register r2 information: NULL pointer
> > [ 6.979095] Register r3 information: NULL pointer
> > [ 6.983825] Register r4 information: slab task_struct start
> > c29d8000 pointer offset 0
> > [ 6.991729] Register r5 information: non-paged memory
> > [ 6.996795] Register r6 information: non-paged memory
> > [ 7.001861] Register r7 information: slab vm_area_struct start
> > c3c95000 pointer offset 0
> > [ 7.010009] Register r8 information: non-slab/vmalloc memory
> > [ 7.015716] Register r9 information: NULL pointer
> > [ 7.020446] Register r10 information: NULL pointer
> > [ 7.025238] Register r11 information: non-paged memory
> > [ 7.030426] Register r12 information: 2-page vmalloc region
> > starting at 0xf000c000 allocated at kernel_clone+0x94/0x3b0
> > [ 7.041259] Process swapper/0 (pid: 1, stack limit = 0xfaff0077)
> > [ 7.047302] Stack: (0xf000dde8 to 0xf000e000)
> > [ 7.051696] dde0: c29d8000 00000cc0 c20a1108
> > c2065fa0 c1e09f50 b6db6db7
> > [ 7.059906] de00: c195bf0c 17c0f572 c29d8000 c3c95000 00000cc0
> > 000befff befff000 befffff1
> > [ 7.068115] de20: 00000081 c3c3afb8 c3c3afb8 00000000 00000000
> > 00000000 00000000 00000000
> > [ 7.076324] de40: 00000000 17c0f572 befff000 c3c95000 00002017
> > befffff1 00002017 00002fb8
> > [ 7.084564] de60: c2d04000 00000081 c29d8000 c04c6790 c20d01d4
> > 00000000 00000001 c20ce440
> > [ 7.092773] de80: c1e10bcc fffff000 00000000 c2a45680 eeb33cc0
> > c29d8000 00000000 c2d04000
> > [ 7.100982] dea0: befffff1 f000df18 00000000 00002017 c20661a0
> > c04c77e8 f000df18 00000000
> > [ 7.109222] dec0: 00000000 c1d95c40 00000002 c20661e0 00000000
> > 00000001 00000000 c04c7ad0
> > [ 7.117431] dee0: 00000011 c2d02a00 00000001 befffff1 c29d8000
> > 00000000 00000011 c2a30010
> > [ 7.125640] df00: c29d8000 c0524c24 f000df18 00000000 00000000
> > 2cd9e000 c1d95c40 17c0f572
> > [ 7.133850] df20: 00000000 c2d02a00 0000000b 00000ffc 00000000
> > befffff1 00000000 c0524f74
> > [ 7.142089] df40: c1e0e394 c2d02a00 c209a71c 38e38e39 c29d8000
> > bee00008 c2d02a00 c2a30000
> > [ 7.150299] df60: c1e0e394 c1e0e420 00000000 00000000 00000000
> > c05266bc c209a000 c1944c60
> > [ 7.158508] df80: 00000000 00000000 00000000 c129d2b4 c209a000
> > c1e0e394 00000000 c12b5600
> > [ 7.166748] dfa0: 00000000 c12b5518 00000000 c0300168 00000000
> > 00000000 00000000 00000000
> > [ 7.174957] dfc0: 00000000 00000000 00000000 00000000 00000000
> > 00000000 00000000 00000000
> > [ 7.183166] dfe0: 00000000 00000000 00000000 00000000 00000013
> > 00000000 00000000 00000000
> > [ 7.191406] Code: 13110001 12211b02 13110b02 03a03000 (e5a03800)
>
> This decodes to
>
> 0: 13110001 tstne r1, #1
> 4: 12211b02 eorne r1, r1, #2048 ; 0x800
> 8: 13110b02 tstne r1, #2048 ; 0x800
> c: 03a03000 moveq r3, #0
> 10:* e5a03800 str r3, [r0, #2048]! ; 0x800 <-- trapping instruction
>
> and R0 points into the stack. So we are updating a PTE that is located
> on the stack rather than in a page table somewhere, which seems very
> odd. However, this could be a latent bug that got uncovered by the
> VMAP stacks changes.
>
> Unfortunately, the vmlinux.xz file I downloaded from the link below
> seems to be different from the one that produced the crash, given that
> the LR address of c04cfeb8 does not seem to correspond with
> handle_mm_fault+0x60c/0xed0.
>
> Can you please double check the artifacts?
Commit "mm: check against orig_pte for finish_fault()" introduced this,
i.e. on yesterdays next reverting a066bab3c0eb made a i.MX6 boot again.
A fix is discussed here:
https://lore.kernel.org/all/YliNP7ADcdc4Puvs@xz-m1.local/
Max
>
>
>
> > metadata:
> > git_ref: master
> > git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
> > git_sha: 634de1db0e9bbeb90d7b01020e59ec3dab4d38a1
> > git_describe: next-20220419
> > kernel-config: https://builds.tuxbuild.com/280TXP6P7tIBfnowvFY4wobXp3R/config
> > System.map: https://builds.tuxbuild.com/280TXP6P7tIBfnowvFY4wobXp3R/System.map
> > vmlinux.xz: https://builds.tuxbuild.com/280TXP6P7tIBfnowvFY4wobXp3R/vmlinux.xz
> > build-url: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next/-/pipelines/519362851
> > build: https://builds.tuxbuild.com/280TXP6P7tIBfnowvFY4wobXp3R
> > toolchain: gcc-10
> >
> > --
> > Linaro LKFT
> > https://lkft.linaro.org
> >
> > [1] https://lkft.validation.linaro.org/scheduler/job/4921995#L2616
> > [2] https://lkft.validation.linaro.org/scheduler/job/4922061#L552
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists•infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-04-20 7:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-19 10:58 [next] arm: boot failed - PC is at cpu_ca15_set_pte_ext Naresh Kamboju
2022-04-19 18:57 ` Russell King (Oracle)
2022-04-20 8:55 ` Naresh Kamboju
2022-04-20 9:44 ` Russell King (Oracle)
2022-04-20 7:31 ` Ard Biesheuvel
2022-04-20 7:50 ` Max Krummenacher [this message]
2022-04-20 13:04 ` Naresh Kamboju
2022-04-20 21:53 ` Andrew Morton
2022-04-20 8:54 ` Naresh Kamboju
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