syzbot

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BUG: KCSAN: data-race in event_sched_in / perf_mmap

read to 0xffff88815991c4b8 of 8 bytes by task 3631 on cpu 1:
 __perf_update_times kernel/events/core.c:634 [inline]
 perf_event_update_time kernel/events/core.c:647 [inline]
 perf_event_set_state kernel/events/core.c:666 [inline]
 event_sched_in+0x190/0xe60 kernel/events/core.c:2585
 group_sched_in kernel/events/core.c:2637 [inline]
 merge_sched_in kernel/events/core.c:3818 [inline]
 visit_groups_merge+0x943/0x1a50 kernel/events/core.c:3762
 ctx_flexible_sched_in kernel/events/core.c:3860 [inline]
 ctx_sched_in+0x221/0x240 kernel/events/core.c:3908
 perf_event_sched_in kernel/events/core.c:2741 [inline]
 perf_event_context_sched_in kernel/events/core.c:3959 [inline]
 __perf_event_task_sched_in+0x37c/0x8d0 kernel/events/core.c:4002
 perf_event_task_sched_in include/linux/perf_event.h:1213 [inline]
 finish_task_switch+0x1ef/0x280 kernel/sched/core.c:4948
 context_switch kernel/sched/core.c:5076 [inline]
 __schedule+0x44b/0x6c0 kernel/sched/core.c:6382
 schedule+0x71/0xa0 kernel/sched/core.c:6454
 __lock_sock net/core/sock.c:2770 [inline]
 lock_sock_nested+0xbd/0x130 net/core/sock.c:3317
 lock_sock include/net/sock.h:1682 [inline]
 __inet_bind+0x298/0x5b0 net/ipv4/af_inet.c:511
 inet_bind+0x8c/0xa0 net/ipv4/af_inet.c:456
 __sys_bind+0x14b/0x1b0 net/socket.c:1697
 __do_sys_bind net/socket.c:1708 [inline]
 __se_sys_bind net/socket.c:1706 [inline]
 __x64_sys_bind+0x3d/0x50 net/socket.c:1706
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x50 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

write to 0xffff88815991c4b8 of 8 bytes by task 3629 on cpu 0:
 perf_event_update_time kernel/events/core.c:647 [inline]
 perf_mmap+0xc1d/0xeb0 kernel/events/core.c:6433
 call_mmap include/linux/fs.h:2055 [inline]
 mmap_region+0xb04/0x10b0 mm/mmap.c:1791
 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:1628
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x50 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x000000000002a502 -> 0x0000000000030d92

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3629 Comm: syz-executor.2 Not tainted 5.18.0-rc1-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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