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From:   Masahiro Yamada <masahiroy@kernel.org>
Date:   Mon, 20 Jul 2020 14:34:04 +0900
Message-ID: <CAK7LNATVDfHJG=+G6DqkR-vSyVhb8KmxcT0ae+ukdi_otthi8A@mail.gmail.com>
Subject: Re: [PATCH v2 13/16] scripts/kallsyms: move ignored symbol types to is_ignored_symbol()
To:     Finn Thain <fthain@telegraphics.com.au>
Cc:     Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
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On Mon, Jul 20, 2020 at 10:46 AM Finn Thain <fthain@telegraphics.com.au> wrote:
>
> On Sun, 24 Nov 2019, Masahiro Yamada wrote:
>
> > Collect the ignored patterns to is_ignored_symbol().
> >
> > Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
>
> This commit (887df76de67f5) caused a regression in my powerpc builds as it
> causes symbol names to disappear from backtraces:
>
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 0 at kernel/smp.c:433 _einittext+0x3f9e5120/0x3feb71b8
> Modules linked in:
> CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc7-pmac-00055-g887df76de67f5 #18
> NIP:  c00aef68 LR: c00af114 CTR: c001272c
> REGS: c0705c40 TRAP: 0700   Not tainted  (5.4.0-rc7-pmac-00055-g887df76de67f5)
> MSR:  00029032 <EE,ME,IR,DR,RI>  CR: 42000044  XER: 00000000
>
> GPR00: 001f0100 c0705cf8 c06dc300 c070af1c c001258c 00000000 00000000 ef7fb5bc
> GPR08: 08800000 00000100 00000001 00000100 42000044 00000000 c0709040 00000004
> GPR16: 00000001 c06022b4 c058297c 00200002 ffff8cb9 00000000 c06d84a0 c0710000
> GPR24: c0710000 00000000 00000000 c070af1c c070af1c 00000000 c001258c 00000000
> NIP [c00aef68] _einittext+0x3f9e5120/0x3feb71b8
> LR [c00af114] _einittext+0x3f9e52cc/0x3feb71b8
> Call Trace:
> [c0705cf8] [ef006320] 0xef006320 (unreliable)
> [c0705d38] [c00af114] _einittext+0x3f9e52cc/0x3feb71b8
> [c0705d48] [c00af158] _einittext+0x3f9e5310/0x3feb71b8
> [c0705d68] [c0012768] _einittext+0x3f948920/0x3feb71b8
> [c0705d78] [c0092c04] _einittext+0x3f9c8dbc/0x3feb71b8
> [c0705d88] [c0092d18] _einittext+0x3f9c8ed0/0x3feb71b8
> [c0705da8] [c0093a2c] _einittext+0x3f9c9be4/0x3feb71b8
> [c0705de8] [c0580224] _einittext+0x3feb63dc/0x3feb71b8
> [c0705e48] [c00382ec] _einittext+0x3f96e4a4/0x3feb71b8
> [c0705e58] [c000d2a0] _einittext+0x3f943458/0x3feb71b8
> [c0705e88] [c001353c] _einittext+0x3f9496f4/0x3feb71b8
> --- interrupt: 901 at _einittext+0x3f941058/0x3feb71b8
>     LR = _einittext+0x3f941058/0x3feb71b8
> [c0705f50] [c06cc214] 0xc06cc214 (unreliable)
> [c0705f60] [c057fa20] _einittext+0x3feb5bd8/0x3feb71b8
> [c0705f70] [c005de48] _einittext+0x3f994000/0x3feb71b8
> [c0705f90] [c005e050] _einittext+0x3f994208/0x3feb71b8
> [c0705fa0] [c0004cc8] _einittext+0x3f93ae80/0x3feb71b8
> [c0705fb0] [c069a36c] _einittext+0x3ffd0524/0x40000000
> [c0705ff0] [00003500] 0x3500
> Instruction dump:
> 7c0803a6 7fa5eb78 7d808120 7ea6ab78 baa10014 38210040 4bfffbb0 7f64db78
> 7f85e378 484b31b1 7c601b78 4bfffdf4 <0fe00000> 4bfffd60 9421ffe0 7c0802a6
> ---[ end trace a06fef4788747c72 ]---
>
>
> Prior to that (e.g. 97261e1e2240f), I get backtraces like this:
>
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 0 at kernel/smp.c:433 smp_call_function_many+0x318/0x320
> Modules linked in:
> CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc7-pmac-00054-g97261e1e2240f #20
> NIP:  c00aef68 LR: c00af114 CTR: c001272c
> REGS: c075dc40 TRAP: 0700   Not tainted  (5.4.0-rc7-pmac-00054-g97261e1e2240f)
> MSR:  00029032 <EE,ME,IR,DR,RI>  CR: 42000044  XER: 00000000
>
> GPR00: 001f0100 c075dcf8 c0733300 c0762f1c c001258c 00000000 00000000 ef7fb5bc
> GPR08: 04800000 00000100 00000001 00000100 42000044 00000000 c0761040 00000004
> GPR16: 00000001 c0658e58 c058297c 00200002 ffff8cb9 00000000 c072f4a0 c0760000
> GPR24: c0760000 00000000 00000000 c0762f1c c0762f1c 00000000 c001258c 00000000
> NIP [c00aef68] smp_call_function_many+0x318/0x320
> LR [c00af114] smp_call_function+0x34/0x44
> Call Trace:
> [c075dcf8] [ef006320] 0xef006320 (unreliable)
> [c075dd38] [c00af114] smp_call_function+0x34/0x44
> [c075dd48] [c00af158] on_each_cpu+0x1c/0x4c
> [c075dd68] [c0012768] tau_timeout_smp+0x3c/0x4c
> [c075dd78] [c0092c04] call_timer_fn.isra.26+0x20/0x84
> [c075dd88] [c0092d18] expire_timers+0xb0/0xc0
> [c075dda8] [c0093a2c] run_timer_softirq+0xa4/0x1a4
> [c075dde8] [c0580224] __do_softirq+0x11c/0x280
> [c075de48] [c00382ec] irq_exit+0xc0/0xd4
> [c075de58] [c000d2a0] timer_interrupt+0x154/0x260
> [c075de88] [c001353c] ret_from_except+0x0/0x14
> --- interrupt: 901 at arch_cpu_idle+0x24/0x78
>     LR = arch_cpu_idle+0x24/0x78
> [c075df50] [c0723214] 0xc0723214 (unreliable)
> [c075df60] [c057fa20] default_idle_call+0x38/0x58
> [c075df70] [c005de48] do_idle+0xd4/0x17c
> [c075df90] [c005e054] cpu_startup_entry+0x24/0x28
> [c075dfa0] [c0004cc8] rest_init+0xa8/0xbc
> [c075dfb0] [c06f136c] start_kernel+0x40c/0x420
> [c075dff0] [00003500] 0x3500
> Instruction dump:
> 7c0803a6 7fa5eb78 7d808120 7ea6ab78 baa10014 38210040 4bfffbb0 7f64db78
> 7f85e378 484b31b1 7c601b78 4bfffdf4 <0fe00000> 4bfffd60 9421ffe0 7c0802a6
> ---[ end trace 784c7f15ecd23941 ]---
>
> Has anyone else observed these problems (either the WARNING from
> smp_call_function_many() or the missing symbol names)?
>
> What is the best way to fix this? Should I upgrade binutils?


I got a similar report before.

I'd like to know whether or not
this is the same issue as fixed by
7883a14339299773b2ce08dcfd97c63c199a9289


Does your problem happen on the latest kernel?
Which version of binutils are you using?


-- 
Best Regards
Masahiro Yamada