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Tue, 17 Jun 2025 03:00:53 -0700 (PDT) Date: Tue, 17 Jun 2025 12:00:51 +0200 From: Michal =?utf-8?Q?Koutn=C3=BD?= To: syzbot , inwardvessel@gmail.com Cc: akpm@linux-foundation.org, andrii@kernel.org, ast@kernel.org, axboe@kernel.dk, bpf@vger.kernel.org, cgroups@vger.kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, hannes@cmpxchg.org, haoluo@google.com, hawk@kernel.org, john.fastabend@gmail.com, jolsa@kernel.org, josef@toxicpanda.com, kpsingh@kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, martin.lau@linux.dev, mhocko@kernel.org, muchun.song@linux.dev, mykolal@fb.com, netdev@vger.kernel.org, roman.gushchin@linux.dev, sdf@fomichev.me, shakeel.butt@linux.dev, shuah@kernel.org, song@kernel.org, syzkaller-bugs@googlegroups.com, tj@kernel.org, yonghong.song@linux.dev Subject: Re: [syzbot] [cgroups?] general protection fault in __cgroup_rstat_lock Message-ID: References: <6751e769.050a0220.b4160.01df.GAE@google.com> <683c7dee.a00a0220.d8eae.0032.GAE@google.com> MIME-Version: 1.0 Content-Type: multipart/signed; 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protected-headers=v1; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [syzbot] [cgroups?] general protection fault in __cgroup_rstat_lock MIME-Version: 1.0 On Mon, Jun 02, 2025 at 04:15:56PM +0200, Michal Koutn=FD wrote: > I'd say this might be relevant (although I don't see the possibly > incorrect error handlnig path) but it doesn't mean this commit fixes it, > it'd rather require the reproducer to adjust the N on this path. Hm, possibly syzbot caught up here [1]: -mkdir(&(0x7f0000000000)=3D'./cgroup/file0\x00', 0xd0939199c36b4d28) (fail_= nth: 8) +mkdirat$cgroup_root(0xffffffffffffff9c, &(0x7f00000005c0)=3D'./cgroup.net/= syz0\x00', 0x1ff) (fail_nth: 23) So there's something fishy in the error handling. HTH, Michal [1] https://lore.kernel.org/lkml/68403875.a00a0220.d4325.000a.GAE@google.co= m/ --krlwbo2bq63d5qwa Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRCE24Fn/AcRjnLivR+PQLnlNv4CAUCaFE80QAKCRB+PQLnlNv4 CFc5AQDFUQDIxN7rZwIY/4HwJm40c4uz7Kwbk8e3RX9sQwVOOQEA0j9JsDa/0bOB mCi/pTl0V4lRqubAZXTV4nhvtAtknwY= =+ozi -----END PGP SIGNATURE----- --krlwbo2bq63d5qwa--