syzbot

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BUG: KCSAN: data-race in vmalloc_info_show / vmalloc_info_show

read to 0xffff8881000473d8 of 4 bytes by task 16164 on cpu 0:
 show_numa_info mm/vmalloc.c:4839 [inline]
 vmalloc_info_show+0x528/0x760 mm/vmalloc.c:4919
 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+0x29bf/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:9
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read-write to 0xffff8881000473d8 of 4 bytes by task 16168 on cpu 1:
 show_numa_info mm/vmalloc.c:4837 [inline]
 vmalloc_info_show+0x44d/0x760 mm/vmalloc.c:4919
 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+0x29bf/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:9
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000050 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16168 Comm: syz-executor.4 Not tainted 6.9.0-rc5-syzkaller-00296-g5eb4573ea63d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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