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List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Objtool segfault inside an VM, based on commit 24172e0d7990 To: Nathan Chancellor Cc: LKML , linux-btrfs References: <0b7d3e02-0609-410e-a221-8e68a0bd89b0@gmx.com> <9cd36c00-b2e0-4d57-94b1-840b084d0a3b@gmx.com> <20251117175041.GA703155@ax162> Content-Language: en-US From: Qu Wenruo Autocrypt: addr=quwenruo.btrfs@gmx.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNIlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT7CwJQEEwEIAD4CGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCZxF1YAUJEP5a sQAKCRDCPZHzoSX+qF+mB/9gXu9C3BV0omDZBDWevJHxpWpOwQ8DxZEbk9b9LcrQlWdhFhyn 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+xjU9efEWfdnjqi2k8yxnTVZvTc0912h3nziNCpTlqze0fOeaV5YU3NNO5FUswcKw2Mwg== =E5=9C=A8 2025/11/18 04:20, Nathan Chancellor =E5=86=99=E9=81=93: > On Mon, Nov 17, 2025 at 03:40:35PM +1030, Qu Wenruo wrote: >> >> >> =E5=9C=A8 2025/11/17 13:33, Qu Wenruo =E5=86=99=E9=81=93: >>> >>> >>> =E5=9C=A8 2025/11/17 13:10, Qu Wenruo =E5=86=99=E9=81=93: >>>> Hi, >>>> >>>> Recently I'm hitting pretty frequent objtool crashes, sometimes >>>> during module linking (btrfs in my case) sometimes during the >>>> vmlinux linking. >>>> >>>> Unfortunately I don't have a coredump for it. >>>> >>>> The only info so far is from dmesg (and obvious the compile failure): >>>> >>>> [=C2=A0 625.066787] traps: objtool[46220] general protection fault >>>> ip:563ab54c6eb0 sp:7ffd9c2ba7c8 error:0 in >>>> objtool[19eb0,563ab54b2000+1f000] >>>> >>>> The involved VM has the following spec: >>>> >>>> - Kernel branch >>>> =C2=A0=C2=A0 Btrfs' development branch. >>>> >>>> =C2=A0=C2=A0 The base commit is 24172e0d79900908cf5ebf366600616d29c9= b417, around >>>> =C2=A0=C2=A0 v6.18-rc6. >> >> Furthermore, if just compiling on old kernels (in my case, 6.17.8), I >> haven't yet hit a linking time segfault. >> >> So it's something in the v6.18 release cycle. >> >> Not sure if it's the recent Zen5 related hassles. >=20 > I had similar objtool crashes and David's fix [1] from another bug > report thread [2] appears to resolve this for me. >=20 > [1]: https://github.com/davidhildenbrand/linux/commit/58e62699f777381887= 30d489accd01ad8e3cdeeb > [2]: https://lore.kernel.org/20251117082023.90176-1-00107082@163.com/ Thanks a lot! Indeed this thread explains why aarch64 doesn't crash and with the patch= =20 applied I haven't yet hit another kernel compiling crash. Thanks, Qu >=20 > Cheers, > Nathan