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From:   "Pandey, Radhey Shyam" <radhey.shyam.pandey@amd.com>
To:     "bhe@redhat.com" <bhe@redhat.com>,
        "piliu@redhat.com" <piliu@redhat.com>
CC:     "kexec@lists.infradead.org" <kexec@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Sarangi, Anirudha" <anirudha.sarangi@amd.com>
Subject: RE: kexec reports "Cannot get kernel _text symbol address" on arm64
 platform
Thread-Topic: kexec reports "Cannot get kernel _text symbol address" on arm64
 platform
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Date:   Fri, 11 Aug 2023 13:27:11 +0000
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> -----Original Message-----
> From: bhe@redhat.com <bhe@redhat.com>
> Sent: Wednesday, August 9, 2023 7:42 AM
> To: Pandey, Radhey Shyam <radhey.shyam.pandey@amd.com>;
> piliu@redhat.com
> Cc: kexec@lists.infradead.org; linux-kernel@vger.kernel.org
> Subject: Re: kexec reports "Cannot get kernel _text symbol address" on
> arm64 platform
>=20
> On 08/08/23 at 07:17pm, Pandey, Radhey Shyam wrote:
> > Hi,
> >
> > I am trying to bring up kdump on arm64 platform[1]. But I get "Cannot g=
et
> kernel _text symbol address".
> >
> > Is there some Dump-capture kernel config options that I am missing?
> >
> > FYI, copied below complete kexec debug log.
> >
> > [1]: https://www.xilinx.com/products/boards-and-kits/vck190.html
>=20
> Your description isn't clear. You saw the printing, then your kdump kerne=
l
> loading succeeded or not?
>=20
> If no, have you tried applying Pingfan's patchset and still saw the issue=
?
>=20
> [PATCHv7 0/5] arm64: zboot support
> https://lore.kernel.org/all/20230803024152.11663-1-piliu@redhat.com/T/#u

I was able to proceed further with loading with crash kernel on triggering =
system crash.
echo c > /proc/sysrq-trigger

But when I copy /proc/vmcore it throws memory abort. Also I see size of /pr=
oc/vmcore really huge (18446603353488633856).
Any possible guess on what could be wrong?


[   80.733523] Starting crashdump kernel...
[   80.737435] Bye!
[    0.000000] Booting Linux on physical CPU 0x0000000001 [0x410fd083]
[    0.000000] Linux version 6.5.0-rc4-ge28001fb4e07 (radheys@xhdradheys41)=
 (aarch64-xilinx-linux-gcc.real (GCC) 12.2.0, GNU ld (GNU Binutils) 2.39.0.=
20220819) #23 SMP Fri Aug 11 16:25:34 IST 2023
<snip>


xilinx-vck190-20232:/run/media/mmcblk0p1# cat /proc/meminfo | head
MemTotal:        2092876 kB
MemFree:         1219928 kB
MemAvailable:    1166004 kB
Buffers:              32 kB
Cached:           756952 kB
SwapCached:            0 kB
Active:             1480 kB
Inactive:          24164 kB
Active(anon):       1452 kB
Inactive(anon):    24160 kB
xilinx-vck190-20232:/run/media/mmcblk0p1# cp /proc/vmcore dump    =20
[  975.284865] Unable to handle kernel level 3 address size fault at virtua=
l address ffff80008d7cf000
[  975.293871] Mem abort info:
[  975.296669]   ESR =3D 0x0000000096000003
[  975.300425]   EC =3D 0x25: DABT (current EL), IL =3D 32 bits
[  975.305738]   SET =3D 0, FnV =3D 0
[  975.308788]   EA =3D 0, S1PTW =3D 0
[  975.311925]   FSC =3D 0x03: level 3 address size fault
[  975.316888] Data abort info:
[  975.319763]   ISV =3D 0, ISS =3D 0x00000003, ISS2 =3D 0x00000000
[  975.325245]   CM =3D 0, WnR =3D 0, TnD =3D 0, TagAccess =3D 0
[  975.330292]   GCS =3D 0, Overlay =3D 0, DirtyBit =3D 0, Xs =3D 0
[  975.335599] swapper pgtable: 4k pages, 48-bit VAs, pgdp=3D000005016ef6b0=
00
[  975.342297] [ffff80008d7cf000] pgd=3D10000501eddfe003, p4d=3D10000501edd=
fe003, pud=3D10000501eddfd003, pmd=3D100005017b695003, pte=3D00687fff840007=
03
[  975.354827] Internal error: Oops: 0000000096000003 [#4] SMP
[  975.360392] Modules linked in:
3  975.
63440] CBPrUo:a d0c aPID: 664 Comm: cp Tainted: G      D            6.5.0-r=
c4-ge28001fb4e07 #23
[  975.372822] Hardware name: Xilinx Versal vck190 Eval board revA (DT)
[  975.379165] pstate: a0000005 (NzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=
=3D--)
[  975.386119] pc : __memcpy+0x110/0x230
[  975.389783] lr : _copy_to_iter+0x3d8/0x4d0
[  975.393874] sp : ffff80008dc939a0
[  975.397178] x29: ffff80008dc939a0 x28: ffff05013c1bea30 x27: 00000000000=
01000
[  975.404309] x26: 0000000000001000 x25: 0000000000001000 x24: ffff80008d7=
cf000
[  975.411440] x23: 0000040000000000 x22: ffff80008dc93ba0 x21: 00000000000=
01000
[  975.418570] x20: ffff000000000000 x19: 0000000000001000 x18: 00000000000=
00000
[  975.425699] x17: 0000000000000000 x16: 0000000000000000 x15: 01400000000=
00000
[  975.432829] x14: ffff8500a9919000 x13: 0040000000000001 x12: 0000fffef68=
31000
[  975.439958] x11: ffff80008d9cf000 x10: 0000000000000000 x9 : 00000000000=
00000
[  975.447088] x8 : ffff80008d7d0000 x7 : ffff0501addfd358 x6 : 04000000000=
00001
[  975.454217] x5 : ffff0501370e9000 x4 : ffff80008d7d0000 x3 : 00000000000=
00000
[  975.461346] x2 : 0000000000001000 x1 : ffff80008d7cf000 x0 : ffff0501370=
e8000
[  975.468476] Call trace:
[  975.470912]  __memcpy+0x110/0x230
[  975.474221]  copy_oldmem_page+0x70/0xac
[  975.478050]  read_from_oldmem.part.0+0x120/0x188
[  975.482663]  read_vmcore+0x14c/0x238
[  975.486231]  proc_reg_read_iter+0x84/0xd8
[  975.490233]  copy_splice_read+0x160/0x288
[  975.494236]  vfs_splice_read+0xac/0x10c
[  975.498063]  splice_direct_to_actor+0xa4/0x26c
[  975.502498]  do_splice_direct+0x90/0xdc
[  975.506325]  do_sendfile+0x344/0x454
[  975.509892]  __arm64_sys_sendfile64+0x134/0x140
[  975.514415]  invoke_syscall+0x54/0x124
[  975.518157]  el0_svc_common.constprop.0+0xc4/0xe4
[  975.522854]  do_el0_svc+0x38/0x98
[  975.526162]  el0_svc+0x2c/0x84
[  975.529211]  el0t_64_sync_handler+0x100/0x12c
[  975.533562]  el0t_64_sync+0x190/0x194
[  975.537218] Code: cb01000e b4fffc2e eb0201df 540004a3 (a940342c)=20
[  975.543302] ---[ end trace 0000000000000000 ]---
t message from systemd-journald@xilinx-vck190-20232 (Tue 2022-11-08 14:16:2=
0 UTC):

kernel[539]: [  975.354827] Internal error: Oops: 0000000096000003 [#4] SMP


Broadcast message from systemd-journald@xilinx-vck190-20232 (Tue 2022-11-08=
 14:16:20 UTC):

kernel[539]: [  975.537218] Code: cb01000e b4fffc2e eb0201df 540004a3 (a940=
342c)

Segmentation fault
xilinx-vck190-20232:/run/media/mmcblk0p1# ls -lrth /proc/vmcore=20
-r--------    1 root     root       16.0E Nov  8 14:05 /proc/vmcore
xilinx-vck190-20232:/run/media/mmcblk0p1# ls -lh /proc/vmcore
-r--------    1 root     root       16.0E Nov  8 14:05 /proc/vmcore
xilinx-vck190-20232:/run/media/mmcblk0p1# ls -l /proc/vmcore
-r--------    1 root     root     18446603353488633856 Nov  8 14:05 /proc/v=
mcore

Thanks,
Radhey