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BUG: KCSAN: data-race in vmalloc_info_show / vmalloc_info_show

read-write to 0xffff888100047280 of 4 bytes by task 12841 on cpu 0:
 show_numa_info mm/vmalloc.c:4935 [inline]
 vmalloc_info_show+0x470/0x770 mm/vmalloc.c:5017
 seq_read_iter+0x2d1/0x930 fs/seq_file.c:230
 proc_reg_read_iter+0x118/0x190 fs/proc/inode.c:299
 new_sync_read fs/read_write.c:484 [inline]
 vfs_read+0x5dc/0x700 fs/read_write.c:565
 ksys_pread64 fs/read_write.c:756 [inline]
 __do_sys_pread64 fs/read_write.c:764 [inline]
 __se_sys_pread64 fs/read_write.c:761 [inline]
 __x64_sys_pread64+0xf6/0x150 fs/read_write.c:761
 x64_sys_call+0x26ee/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:18
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read-write to 0xffff888100047280 of 4 bytes by task 12845 on cpu 1:
 show_numa_info mm/vmalloc.c:4935 [inline]
 vmalloc_info_show+0x470/0x770 mm/vmalloc.c:5017
 seq_read_iter+0x2d1/0x930 fs/seq_file.c:230
 proc_reg_read_iter+0x118/0x190 fs/proc/inode.c:299
 new_sync_read fs/read_write.c:484 [inline]
 vfs_read+0x5dc/0x700 fs/read_write.c:565
 ksys_pread64 fs/read_write.c:756 [inline]
 __do_sys_pread64 fs/read_write.c:764 [inline]
 __se_sys_pread64 fs/read_write.c:761 [inline]
 __x64_sys_pread64+0xf6/0x150 fs/read_write.c:761
 x64_sys_call+0x26ee/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:18
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x000001fd -> 0x00000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 12845 Comm: syz.0.2886 Tainted: G        W          6.12.0-syzkaller-11677-g2ba9f676d0a2 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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EXT4-fs (loop0): unmounting filesystem 00000000-0000-0000-0000-000000000000.