linux-kernel - Re: [tip:x86/mm] [x86/kasan] 9fd429c280: BUG:unable_to_handle_page_fault_for

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Message-ID: <Y3LdJni8+ye/soOV@google.com>
Date:   Tue, 15 Nov 2022 00:28:22 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     kernel test robot <yujie.liu@...el.com>
Cc:     Andrey Ryabinin <ryabinin.a.a@...il.com>, oe-lkp@...ts.linux.dev,
        lkp@...el.com, Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        kasan-dev@...glegroups.com, Han Ning <ning.han@...el.com>
Subject: Re: [tip:x86/mm] [x86/kasan] 9fd429c280:
 BUG:unable_to_handle_page_fault_for_address

On Sat, Nov 12, 2022, kernel test robot wrote:
> Greeting,
> 
> FYI, we noticed BUG:unable_to_handle_page_fault_for_address due to commit (built with gcc-11):
> 
> commit: 9fd429c28073fa40f5465cd6e4769a0af80bf398 ("x86/kasan: Map shadow for percpu pages on demand")
> https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git x86/mm
> 
> [test failed on linux-next/master f8f60f322f0640c8edda2942ca5f84b7a27c417a]
> 
> on test machine: 128 threads 2 sockets Intel(R) Xeon(R) Platinum 8358 CPU @ 2.60GHz (Ice Lake) with 128G memory
> 
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> 
> 
> [  158.064712][ T8416] BUG: unable to handle page fault for address: fffffbc00012de04
> [  158.074534][ T8416] #PF: supervisor read access in kernel mode
> [  158.074537][ T8416] #PF: error_code(0x0000) - not-present page
> [  158.095763][ T8416] PGD 207e210067 P4D 1fef217067 PUD 1fef216067 PMD 103344b067 PTE 0
> [  158.095770][ T8416] Oops: 0000 [#1] SMP KASAN NOPTI
> [  158.095773][ T8416] CPU: 34 PID: 8416 Comm: umip_test_basic Not tainted 6.1.0-rc2-00001-g9fd429c28073 #1
> [ 158.107429][ T8416] RIP: 0010:get_desc (arch/x86/lib/insn-eval.c:660) 
> [ 158.107465][ T8416] insn_get_seg_base (arch/x86/lib/insn-eval.c:725) 
> [ 158.117492][ T8416] insn_fetch_from_user (arch/x86/lib/insn-eval.c:1476 arch/x86/lib/insn-eval.c:1505) 
> [ 158.117496][ T8416] fixup_umip_exception (arch/x86/kernel/umip.c:353) 
> [ 158.187382][ T8416] exc_general_protection (arch/x86/kernel/traps.c:733 arch/x86/kernel/traps.c:721) 
> [ 158.187386][ T8416] asm_exc_general_protection (arch/x86/include/asm/idtentry.h:564) 

...

> We are sorry that the testcase and reproducing steps are not available
> for this case. Hope the call trace can help to investigate, and we can
> also help to do further verification if needed. Thanks.

Luckily, it's a known issue.

https://lore.kernel.org/all/20221110203504.1985010-3-seanjc@google.com