==================================================================
BUG: KCSAN: data-race in __anon_vma_prepare / wp_page_copy

write to 0xffff88815af4dc88 of 8 bytes by task 22373 on cpu 1:
 __anon_vma_prepare+0x12f/0x2d0 mm/rmap.c:207
 anon_vma_prepare include/linux/rmap.h:152 [inline]
 wp_page_copy+0xb06/0x10c0 mm/memory.c:2844
 do_wp_page+0x5a8/0xba0 include/linux/spinlock_api_smp.h:152
 handle_pte_fault mm/memory.c:4336 [inline]
 __handle_mm_fault mm/memory.c:4453 [inline]
 handle_mm_fault+0xb31/0x1a70 mm/memory.c:4551
 do_user_addr_fault+0x60c/0xc00 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x94/0x230 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577
 copy_user_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:91
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline]
 _copy_to_user+0x77/0x90 lib/usercopy.c:33
 copy_to_user include/linux/uaccess.h:200 [inline]
 put_itimerval kernel/time/itimer.c:109 [inline]
 __do_sys_setitimer kernel/time/itimer.c:353 [inline]
 __se_sys_setitimer+0x148/0x290 kernel/time/itimer.c:332
 __x64_sys_setitimer+0x3f/0x50 kernel/time/itimer.c:332
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88815af4dc88 of 8 bytes by task 22357 on cpu 0:
 anon_vma_prepare include/linux/rmap.h:149 [inline]
 wp_page_copy+0x5f/0x10c0 mm/memory.c:2844
 do_wp_page+0x5a8/0xba0 include/linux/spinlock_api_smp.h:152
 handle_pte_fault mm/memory.c:4336 [inline]
 __handle_mm_fault mm/memory.c:4453 [inline]
 handle_mm_fault+0xb31/0x1a70 mm/memory.c:4551
 do_user_addr_fault+0x60c/0xc00 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x94/0x230 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577
 copy_user_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:91
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline]
 _copy_to_user+0x77/0x90 lib/usercopy.c:33
 copy_to_user include/linux/uaccess.h:200 [inline]
 do_pipe2+0x60/0xf0 fs/pipe.c:994
 __do_sys_pipe2 fs/pipe.c:1010 [inline]
 __se_sys_pipe2 fs/pipe.c:1008 [inline]
 __x64_sys_pipe2+0x2c/0x40 fs/pipe.c:1008
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22357 Comm: syz-executor.4 Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================