==================================================================
BUG: KCSAN: data-race in __percpu_counter_init_many / copy_mm

write to 0xffff88810936c908 of 8 bytes by task 6032 on cpu 1:
 __list_add include/linux/list.h:153 [inline]
 list_add include/linux/list.h:169 [inline]
 __percpu_counter_init_many+0x292/0x310 lib/percpu_counter.c:220
 ext4_es_register_shrinker+0x91/0x280 fs/ext4/extents_status.c:1726
 __ext4_fill_super fs/ext4/super.c:5353 [inline]
 ext4_fill_super+0x1de0/0x34e0 fs/ext4/super.c:5726
 get_tree_bdev_flags+0x291/0x300 fs/super.c:1686
 get_tree_bdev+0x1f/0x30 fs/super.c:1709
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5758
 vfs_get_tree+0x54/0x1d0 fs/super.c:1809
 do_new_mount+0x207/0x680 fs/namespace.c:3882
 path_mount+0x4a4/0xb20 fs/namespace.c:4209
 do_mount fs/namespace.c:4222 [inline]
 __do_sys_mount fs/namespace.c:4433 [inline]
 __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4410
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4410
 x64_sys_call+0xd36/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810936c500 of 1408 bytes by task 6036 on cpu 0:
 dup_mm kernel/fork.c:1731 [inline]
 copy_mm+0xfb/0x1360 kernel/fork.c:1789
 copy_process+0xcf1/0x1fe0 kernel/fork.c:2429
 kernel_clone+0x16c/0x5b0 kernel/fork.c:2859
 __do_sys_clone kernel/fork.c:3002 [inline]
 __se_sys_clone kernel/fork.c:2986 [inline]
 __x64_sys_clone+0xe6/0x120 kernel/fork.c:2986
 x64_sys_call+0x2c59/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 6036 Comm: syz.0.939 Not tainted 6.15.0-syzkaller-03645-g3d413f0cfd7e #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
==================================================================