syzbot

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BUG: KCSAN: data-race in vmalloc_info_show / vmalloc_info_show

write to 0xffff88810120eff8 of 4 bytes by task 13195 on cpu 1:
 show_numa_info mm/vmalloc.c:4948 [inline]
 vmalloc_info_show+0x421/0x790 mm/vmalloc.c:5033
 traverse+0x144/0x3a0 fs/seq_file.c:111
 seq_read_iter+0x853/0x940 fs/seq_file.c:195
 proc_reg_read_iter+0x110/0x180 fs/proc/inode.c:299
 new_sync_read fs/read_write.c:489 [inline]
 vfs_read+0x5ca/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 0xffff88810120eff8 of 4 bytes by task 13194 on cpu 0:
 show_numa_info mm/vmalloc.c:4951 [inline]
 vmalloc_info_show+0x481/0x790 mm/vmalloc.c:5033
 seq_read_iter+0x319/0x940 fs/seq_file.c:230
 proc_reg_read_iter+0x110/0x180 fs/proc/inode.c:299
 new_sync_read fs/read_write.c:489 [inline]
 vfs_read+0x5ca/0x6f0 fs/read_write.c:570
 ksys_read+0xda/0x1a0 fs/read_write.c:713
 __do_sys_read fs/read_write.c:722 [inline]
 __se_sys_read fs/read_write.c:720 [inline]
 __x64_sys_read+0x40/0x50 fs/read_write.c:720
 x64_sys_call+0x2d77/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:1
 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: 0x00000053 -> 0x00000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 13194 Comm: syz.0.2852 Not tainted 6.15.0-rc6-syzkaller-00188-gfee3e843b309 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
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