==================================================================
BUG: KCSAN: data-race in vmalloc_info_show / vmalloc_info_show

read-write to 0xffff888101001130 of 4 bytes by task 5920 on cpu 1:
 show_numa_info mm/vmalloc.c:4853 [inline]
 vmalloc_info_show+0x470/0x770 mm/vmalloc.c:4935
 seq_read_iter+0x2d7/0x940 fs/seq_file.c:230
 proc_reg_read_iter+0x11e/0x190 fs/proc/inode.c:299
 copy_splice_read+0x3a4/0x5d0 fs/splice.c:365
 do_splice_read fs/splice.c:985 [inline]
 splice_direct_to_actor+0x26c/0x670 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3ab/0x950 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 x64_sys_call+0xed5/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:41
 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 0xffff888101001130 of 4 bytes by task 5919 on cpu 0:
 show_numa_info mm/vmalloc.c:4853 [inline]
 vmalloc_info_show+0x470/0x770 mm/vmalloc.c:4935
 traverse+0x155/0x3c0 fs/seq_file.c:111
 seq_lseek+0xae/0x170 fs/seq_file.c:323
 proc_reg_llseek+0x11e/0x1a0 fs/proc/inode.c:283
 vfs_llseek fs/read_write.c:289 [inline]
 ksys_lseek fs/read_write.c:302 [inline]
 __do_sys_lseek fs/read_write.c:313 [inline]
 __se_sys_lseek fs/read_write.c:311 [inline]
 __x64_sys_lseek+0xed/0x150 fs/read_write.c:311
 x64_sys_call+0x29e5/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:9
 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: 0x0000005b -> 0x00000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 5919 Comm: syz.1.562 Not tainted 6.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
==================================================================