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@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== 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 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
