From: syzbot <syzbot+dd8e45eb61404849cde9@syzkaller.appspotmail.com>
To: bpf@vger.kernel.org, brauner@kernel.org, cgroups@vger.kernel.org,
glider@google.com, hannes@cmpxchg.org,
linux-kernel@vger.kernel.org, lizefan.x@bytedance.com,
syzkaller-bugs@googlegroups.com, tj@kernel.org
Subject: Re: [syzbot] KMSAN: uninit-value in psi_poll_worker
Date: Fri, 26 Aug 2022 02:27:25 -0700 [thread overview]
Message-ID: <000000000000a4d93d05e7218510@google.com> (raw)
In-Reply-To: <0000000000002c7abf05e721698d@google.com>
syzbot has found a reproducer for the following issue on:
HEAD commit: 3a2b6b904ea7 x86: kmsan: enable KMSAN builds for x86
git tree: https://github.com/google/kmsan.git master
console+strace: https://syzkaller.appspot.com/x/log.txt?x=14d6a513080000
kernel config: https://syzkaller.appspot.com/x/.config?x=8e64bc5364a1307e
dashboard link: https://syzkaller.appspot.com/bug?extid=dd8e45eb61404849cde9
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project.git 610139d2d9ce6746b3c617fb3e2f7886272d26ff), GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10fc7ac7080000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14ea06db080000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dd8e45eb61404849cde9@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in psi_show+0x701/0x810 kernel/sched/psi.c:1082
psi_show+0x701/0x810 kernel/sched/psi.c:1082
cgroup_io_pressure_show+0x2b6/0x2f0 kernel/cgroup/cgroup.c:3662
cgroup_seqfile_show+0x1fe/0x470 kernel/cgroup/cgroup.c:3991
kernfs_seq_show+0x13b/0x1f0 fs/kernfs/file.c:217
seq_read_iter+0x926/0x20c0 fs/seq_file.c:230
kernfs_fop_read_iter+0x1f2/0xa10 fs/kernfs/file.c:299
call_read_iter include/linux/fs.h:2181 [inline]
generic_file_splice_read+0x1e5/0x770 fs/splice.c:309
do_splice_to fs/splice.c:793 [inline]
splice_direct_to_actor+0x5b2/0x1190 fs/splice.c:865
do_splice_direct+0x252/0x3d0 fs/splice.c:974
do_sendfile+0xbe9/0x1ba0 fs/read_write.c:1249
__do_sys_sendfile64 fs/read_write.c:1317 [inline]
__se_sys_sendfile64+0x202/0x2a0 fs/read_write.c:1303
__x64_sys_sendfile64+0xb9/0x110 fs/read_write.c:1303
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Uninit was created at:
slab_post_alloc_hook mm/slab.h:732 [inline]
slab_alloc_node mm/slub.c:3258 [inline]
slab_alloc mm/slub.c:3266 [inline]
kmem_cache_alloc_trace+0x696/0xdf0 mm/slub.c:3297
kmalloc include/linux/slab.h:600 [inline]
psi_cgroup_alloc+0x83/0x250 kernel/sched/psi.c:960
cgroup_create kernel/cgroup/cgroup.c:5430 [inline]
cgroup_mkdir+0x10a3/0x3080 kernel/cgroup/cgroup.c:5550
kernfs_iop_mkdir+0x2ba/0x520 fs/kernfs/dir.c:1185
vfs_mkdir+0x62a/0x870 fs/namei.c:4013
do_mkdirat+0x466/0x7b0 fs/namei.c:4038
__do_sys_mkdirat fs/namei.c:4053 [inline]
__se_sys_mkdirat fs/namei.c:4051 [inline]
__x64_sys_mkdirat+0xc4/0x120 fs/namei.c:4051
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
CPU: 1 PID: 3493 Comm: syz-executor306 Not tainted 6.0.0-rc2-syzkaller-47460-g3a2b6b904ea7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
=====================================================
prev parent reply other threads:[~2022-08-26 9:27 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-26 9:19 [syzbot] KMSAN: uninit-value in psi_poll_worker syzbot
2022-08-26 9:27 ` syzbot [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=000000000000a4d93d05e7218510@google.com \
--to=syzbot+dd8e45eb61404849cde9@syzkaller.appspotmail.com \
--cc=bpf@vger.kernel.org \
--cc=brauner@kernel.org \
--cc=cgroups@vger.kernel.org \
--cc=glider@google.com \
--cc=hannes@cmpxchg.org \
--cc=linux-kernel@vger.kernel.org \
--cc=lizefan.x@bytedance.com \
--cc=syzkaller-bugs@googlegroups.com \
--cc=tj@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox