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BUG: KCSAN: data-race in vmalloc_info_show / vmalloc_info_show

write to 0xffff888100047608 of 4 bytes by task 26265 on cpu 0:
 show_numa_info mm/vmalloc.c:4948 [inline]
 vmalloc_info_show+0x421/0x790 mm/vmalloc.c:5033
 traverse+0x141/0x3a0 fs/seq_file.c:111
 seq_read_iter+0x853/0x940 fs/seq_file.c:195
 proc_reg_read_iter+0x10d/0x180 fs/proc/inode.c:299
 new_sync_read fs/read_write.c:489 [inline]
 vfs_read+0x5cd/0x6f0 fs/read_write.c:570
 ksys_pread64 fs/read_write.c:761 [inline]
 __do_sys_pread64 fs/read_write.c:769 [inline]
 __se_sys_pread64 fs/read_write.c:766 [inline]
 __x64_sys_pread64+0xfd/0x150 fs/read_write.c:766
 x64_sys_call+0x296d/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:18
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read-write to 0xffff888100047608 of 4 bytes by task 26268 on cpu 1:
 show_numa_info mm/vmalloc.c:4951 [inline]
 vmalloc_info_show+0x481/0x790 mm/vmalloc.c:5033
 traverse+0x141/0x3a0 fs/seq_file.c:111
 seq_read_iter+0x853/0x940 fs/seq_file.c:195
 proc_reg_read_iter+0x10d/0x180 fs/proc/inode.c:299
 new_sync_read fs/read_write.c:489 [inline]
 vfs_read+0x5cd/0x6f0 fs/read_write.c:570
 ksys_pread64 fs/read_write.c:761 [inline]
 __do_sys_pread64 fs/read_write.c:769 [inline]
 __se_sys_pread64 fs/read_write.c:766 [inline]
 __x64_sys_pread64+0xfd/0x150 fs/read_write.c:766
 x64_sys_call+0x296d/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:18
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000 -> 0x00000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 26268 Comm: syz.1.8006 Not tainted 6.15.0-rc7-syzkaller-00142-g4856ebd99715 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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