EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
ext4 filesystem being mounted at /root/syzkaller-testdir800032643/syzkaller.XIEL5c/882/file1 supports timestamps until 2038-01-19 (0x7fffffff)
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BUG: KCSAN: data-race in shmem_fallocate / shmem_fault

write to 0xffff8881378a1e90 of 8 bytes by task 20613 on cpu 1:
 shmem_fallocate+0x24a/0x870 mm/shmem.c:3057
 vfs_fallocate+0x378/0x3e0 fs/open.c:324
 madvise_remove mm/madvise.c:1011 [inline]
 madvise_vma_behavior mm/madvise.c:1035 [inline]
 madvise_walk_vmas mm/madvise.c:1270 [inline]
 do_madvise+0x7a9/0x2970 mm/madvise.c:1450
 __do_sys_madvise mm/madvise.c:1463 [inline]
 __se_sys_madvise mm/madvise.c:1461 [inline]
 __x64_sys_madvise+0x60/0x70 mm/madvise.c:1461
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881378a1e90 of 8 bytes by task 20578 on cpu 0:
 shmem_fault+0x9f/0x430 mm/shmem.c:2185
 __do_fault mm/memory.c:4207 [inline]
 do_shared_fault mm/memory.c:4638 [inline]
 do_fault mm/memory.c:4712 [inline]
 do_pte_missing mm/memory.c:3672 [inline]
 handle_pte_fault mm/memory.c:4981 [inline]
 __handle_mm_fault mm/memory.c:5122 [inline]
 handle_mm_fault+0x170f/0x2cc0 mm/memory.c:5287
 faultin_page mm/gup.c:956 [inline]
 __get_user_pages+0x402/0xe40 mm/gup.c:1239
 faultin_vma_page_range+0x7e/0xa0 mm/gup.c:1724
 madvise_populate mm/madvise.c:939 [inline]
 madvise_vma_behavior mm/madvise.c:1048 [inline]
 madvise_walk_vmas mm/madvise.c:1270 [inline]
 do_madvise+0x979/0x2970 mm/madvise.c:1450
 __do_sys_madvise mm/madvise.c:1463 [inline]
 __se_sys_madvise mm/madvise.c:1461 [inline]
 __x64_sys_madvise+0x60/0x70 mm/madvise.c:1461
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000000 -> 0xffffc9000bd73cd8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 20578 Comm: syz-executor.5 Not tainted 6.6.0-rc7-syzkaller-00187-g51a7691038c3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
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syz-executor.5 (20578) used greatest stack depth: 10080 bytes left