netdev - [syzbot] KCSAN: data-race in perf_event_update_userpage / perf_event_update

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Message-ID: <000000000000489d6105d7a7255e@google.com>
Date:   Thu, 10 Feb 2022 02:09:28 -0800
From:   syzbot <syzbot+df838a721c117d596976@...kaller.appspotmail.com>
To:     acme@...nel.org, alexander.shishkin@...ux.intel.com,
        andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, john.fastabend@...il.com, jolsa@...hat.com,
        kafai@...com, kpsingh@...nel.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, mark.rutland@....com,
        mingo@...hat.com, namhyung@...nel.org, netdev@...r.kernel.org,
        peterz@...radead.org, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, yhs@...com
Subject: [syzbot] KCSAN: data-race in perf_event_update_userpage /
 perf_event_update_userpage (5)

Hello,

syzbot found the following issue on:

HEAD commit:    dcb85f85fa6f gcc-plugins/stackleak: Use noinstr in favor o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14f2e20c700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a83209f215159f48
dashboard link: https://syzkaller.appspot.com/bug?extid=df838a721c117d596976
compiler:       Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+df838a721c117d596976@...kaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in perf_event_update_userpage / perf_event_update_userpage

write to 0xffff88812430e020 of 8 bytes by task 11328 on cpu 1:
 perf_event_update_userpage+0x328/0x3b0 kernel/events/core.c:5941
 cpu_clock_event_add+0x11d/0x130 kernel/events/core.c:10780
 event_sched_in+0x781/0xe60 kernel/events/core.c:2601
 group_sched_in kernel/events/core.c:2637 [inline]
 merge_sched_in kernel/events/core.c:3802 [inline]
 visit_groups_merge+0x943/0x1a50 kernel/events/core.c:3746
 ctx_flexible_sched_in kernel/events/core.c:3844 [inline]
 ctx_sched_in+0x221/0x240 kernel/events/core.c:3892
 perf_event_sched_in kernel/events/core.c:2741 [inline]
 perf_event_context_sched_in kernel/events/core.c:3943 [inline]
 __perf_event_task_sched_in+0x37c/0x8d0 kernel/events/core.c:3986
 perf_event_task_sched_in include/linux/perf_event.h:1213 [inline]
 finish_task_switch+0x1ef/0x280 kernel/sched/core.c:4861
 context_switch kernel/sched/core.c:4989 [inline]
 __schedule+0x43a/0x690 kernel/sched/core.c:6295
 preempt_schedule_common kernel/sched/core.c:6461 [inline]
 __cond_resched+0x3f/0x90 kernel/sched/core.c:8174
 might_resched include/linux/kernel.h:110 [inline]
 might_alloc include/linux/sched/mm.h:256 [inline]
 slab_pre_alloc_hook mm/slab.h:705 [inline]
 slab_alloc mm/slab.c:3298 [inline]
 kmem_cache_alloc+0x45/0x320 mm/slab.c:3499
 kmem_cache_zalloc include/linux/slab.h:705 [inline]
 __proc_create+0x3cf/0x6a0 fs/proc/generic.c:426
 _proc_mkdir+0x5c/0xf0 fs/proc/generic.c:487
 proc_net_mkdir include/linux/proc_fs.h:226 [inline]
 nfs_fs_proc_net_init+0x79/0x140 fs/nfs/client.c:1329
 nfs_net_init+0x19/0x20 fs/nfs/inode.c:2346
 ops_init+0x1e7/0x230 net/core/net_namespace.c:140
 setup_net+0x29b/0x7e0 net/core/net_namespace.c:330
 copy_net_ns+0x2a9/0x450 net/core/net_namespace.c:474
 create_new_namespaces+0x231/0x560 kernel/nsproxy.c:110
 copy_namespaces+0x116/0x160 kernel/nsproxy.c:178
 copy_process+0x1428/0x2f30 kernel/fork.c:2167
 kernel_clone+0x15c/0x6a0 kernel/fork.c:2555
 __do_sys_clone kernel/fork.c:2672 [inline]
 __se_sys_clone kernel/fork.c:2656 [inline]
 __x64_sys_clone+0xc6/0xf0 kernel/fork.c:2656
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

write to 0xffff88812430e020 of 8 bytes by task 11341 on cpu 0:
 perf_event_update_userpage+0x328/0x3b0 kernel/events/core.c:5941
 perf_mmap+0xcd6/0xe50 kernel/events/core.c:6419
 call_mmap include/linux/fs.h:2079 [inline]
 mmap_region+0xb04/0x10b0 mm/mmap.c:1793
 do_mmap+0x781/0xc20 mm/mmap.c:1582
 vm_mmap_pgoff+0x117/0x1f0 mm/util.c:519
 ksys_mmap_pgoff+0x265/0x320 mm/mmap.c:1630
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000000 -> 0x000000000135f629

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11341 Comm: syz-executor.4 Not tainted 5.17.0-rc2-syzkaller-00167-gdcb85f85fa6f-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================


---
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