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References: <CA+G9fYt_b04YNCCv-iTZTtwb5fmNEQ0abiO46qW_-SrA1GQX8w@mail.gmail.com>
 <Y8Fkjxsq5EOtGiql@casper.infradead.org>
In-Reply-To: <Y8Fkjxsq5EOtGiql@casper.infradead.org>
From:   Naresh Kamboju <naresh.kamboju@linaro.org>
Date:   Fri, 13 Jan 2023 21:14:15 +0530
Message-ID: <CA+G9fYuahjaNs6ia1UOeF98hUhonAt0Z4YOFGcqOKt3J4tRvTw@mail.gmail.com>
Subject: Re: next: BUG: kernel NULL pointer dereference, address:
 0000000000000008 - RIP: 0010:do_wp_page
To:     Matthew Wilcox <willy@infradead.org>
Cc:     open list <linux-kernel@vger.kernel.org>,
        Linux-Next Mailing List <linux-next@vger.kernel.org>,
        lkft-triage@lists.linaro.org, regressions@lists.linux.dev,
        Kefeng Wang <wangkefeng.wang@huawei.com>,
        Mark Brown <broonie@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Anders Roxell <anders.roxell@linaro.org>
Content-Type: multipart/mixed; boundary="000000000000cbe25205f2271b2e"
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--000000000000cbe25205f2271b2e
Content-Type: text/plain; charset="UTF-8"

Hi Matthew,

On Fri, 13 Jan 2023 at 19:32, Matthew Wilcox <willy@infradead.org> wrote:
>
> On Fri, Jan 13, 2023 at 06:53:01PM +0530, Naresh Kamboju wrote:
> > Linux next tag 20230113 boot failed on x86_64, arm64, arm and i386.
>
> Why are you still not running these stack dumps through
> scripts/decode_stacktrace.sh ?  That seems like it's much easier for you
> to do than expecting everybody who might be interested in investigating
> your reports to pull down enough of the build artifacts to make it work.

Hope this will help you.

# ./scripts/decode_stacktrace.sh vmlinux  < input.txt > output.txt

stack dumps:
------------------
[   15.945626] BUG: kernel NULL pointer dereference, address: 0000000000000008
[   15.952588] #PF: supervisor read access in kernel mode
[   15.957720] #PF: error_code(0x0000) - not-present page
[   15.962850] PGD 8000000103213067 P4D 8000000103213067 PUD 103212067 PMD 0
[   15.969724] Oops: 0000 [#1] PREEMPT SMP PTI
[   15.973909] CPU: 3 PID: 1 Comm: init Not tainted 6.2.0-rc3-next-20230113 #1
[   15.980869] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.0b 07/27/2017
[   15.988336] RIP: 0010:do_wp_page (memory.c:?)
[ 15.992611] Code: 83 ea 01 49 89 d7 48 85 d2 0f 85 00 ff ff ff 49 8b
7c 24 60 e8 0b f2 e9 00 41 8b 44 24 28 4d 8b 74 24 50 4d 8b 2c 24 89
45 88 <49> 8b 46 08 49 8b 5d 10 a8 01 0f 85 78 02 00 00 0f 1f 44 00 00
4c
All code
========
   0: 83 ea 01              sub    $0x1,%edx
   3: 49 89 d7              mov    %rdx,%r15
   6: 48 85 d2              test   %rdx,%rdx
   9: 0f 85 00 ff ff ff    jne    0xffffffffffffff0f
   f: 49 8b 7c 24 60        mov    0x60(%r12),%rdi
  14: e8 0b f2 e9 00        callq  0xe9f224
  19: 41 8b 44 24 28        mov    0x28(%r12),%eax
  1e: 4d 8b 74 24 50        mov    0x50(%r12),%r14
  23: 4d 8b 2c 24          mov    (%r12),%r13
  27: 89 45 88              mov    %eax,-0x78(%rbp)
  2a:* 49 8b 46 08          mov    0x8(%r14),%rax <-- trapping instruction
  2e: 49 8b 5d 10          mov    0x10(%r13),%rbx
  32: a8 01                test   $0x1,%al
  34: 0f 85 78 02 00 00    jne    0x2b2
  3a: 0f 1f 44 00 00        nopl   0x0(%rax,%rax,1)
  3f: 4c                    rex.WR

Code starting with the faulting instruction
===========================================
   0: 49 8b 46 08          mov    0x8(%r14),%rax
   4: 49 8b 5d 10          mov    0x10(%r13),%rbx
   8: a8 01                test   $0x1,%al
   a: 0f 85 78 02 00 00    jne    0x288
  10: 0f 1f 44 00 00        nopl   0x0(%rax,%rax,1)
  15: 4c                    rex.WR
[   16.011356] RSP: 0000:ffffb3f640027d18 EFLAGS: 00010286
[   16.016583] RAX: 0000000000000a55 RBX: 0400000000000080 RCX: 0000000000000000
[   16.023715] RDX: 0000000000000000 RSI: ffffffff8d3d2bd5 RDI: ffffffff8e271dfa
[   16.030838] RBP: ffffb3f640027db0 R08: 8000000432ee9225 R09: ffff8ac3431e3100
[   16.037962] R10: 0000000000000000 R11: 00007fe169f2f598 R12: ffffb3f640027de0
[   16.045087] R13: ffff8ac3431e2000 R14: 0000000000000000 R15: 0400000000000000
[   16.052211] FS:  00007fe16973e800(0000) GS:ffff8ac69fd80000(0000)
knlGS:0000000000000000
[   16.060319] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   16.066060] CR2: 0000000000000008 CR3: 00000001008d4002 CR4: 00000000003706e0
[   16.073183] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   16.080322] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   16.087446] Call Trace:
[   16.089893]  <TASK>
[   16.091991] ? trace_preempt_off (??:?)
[   16.096087] ? __handle_mm_fault (memory.c:?)
[   16.100439] __handle_mm_fault (memory.c:?)
[   16.104617] handle_mm_fault (??:?)
[   16.108457] do_user_addr_fault (fault.c:?)
[   16.112642] exc_page_fault (??:?)
[   16.116394] asm_exc_page_fault (??:?)
[   16.120408] RIP: 0033:0x7fe169dbf31e
[ 16.123986] Code: ba ff ff ff ff 0f 9f c0 0f b6 c0 0f 4c c2 c3 66 2e
0f 1f 84 00 00 00 00 00 0f 1f 00 41 54 31 c0 ba ff ff ff ff 53 48 83
ec 08 <f0> 0f b1 15 72 02 17 00 83 f8 ff 74 35 41 89 c4 85 c0 75 21 31
c0
All code
========
   0: ba ff ff ff ff        mov    $0xffffffff,%edx
   5: 0f 9f c0              setg   %al
   8: 0f b6 c0              movzbl %al,%eax
   b: 0f 4c c2              cmovl  %edx,%eax
   e: c3                    retq
   f: 66 2e 0f 1f 84 00 00 nopw   %cs:0x0(%rax,%rax,1)
  16: 00 00 00
  19: 0f 1f 00              nopl   (%rax)
  1c: 41 54                push   %r12
  1e: 31 c0                xor    %eax,%eax
  20: ba ff ff ff ff        mov    $0xffffffff,%edx
  25: 53                    push   %rbx
  26: 48 83 ec 08          sub    $0x8,%rsp
  2a:* f0 0f b1 15 72 02 17 lock cmpxchg %edx,0x170272(%rip)        #
0x1702a4 <-- trapping instruction
  31: 00
  32: 83 f8 ff              cmp    $0xffffffff,%eax
  35: 74 35                je     0x6c
  37: 41 89 c4              mov    %eax,%r12d
  3a: 85 c0                test   %eax,%eax
  3c: 75 21                jne    0x5f
  3e: 31 c0                xor    %eax,%eax

Code starting with the faulting instruction
===========================================
   0: f0 0f b1 15 72 02 17 lock cmpxchg %edx,0x170272(%rip)        # 0x17027a
   7: 00
   8: 83 f8 ff              cmp    $0xffffffff,%eax
   b: 74 35                je     0x42
   d: 41 89 c4              mov    %eax,%r12d
  10: 85 c0                test   %eax,%eax
  12: 75 21                jne    0x35
  14: 31 c0                xor    %eax,%eax
[   16.142724] RSP: 002b:00007ffcd0edec80 EFLAGS: 00010202
[   16.147948] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000555bd8
[   16.155074] RDX: 00000000ffffffff RSI: 00007ffcd0edefa8 RDI: 0000000000000001
[   16.162198] RBP: 00007ffcd0edefa8 R08: 00007fe169bc5a10 R09: 00007fe169f37a10
[   16.169319] R10: 00007fe169adf3ee R11: 0000000000000246 R12: 00007ffcd0edefa8
[   16.176445] R13: 000000000041b9a0 R14: 0000000000555bd8 R15: 00007fe169f69000
[   16.183569]  </TASK>
[   16.185752] Modules linked in:
[   16.188803] CR2: 0000000000000008
[   16.192114] ---[ end trace 0000000000000000 ]---

ref:
https://lore.kernel.org/linux-next/CA+G9fYt_b04YNCCv-iTZTtwb5fmNEQ0abiO46qW_-SrA1GQX8w@mail.gmail.com/

- Naresh

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