==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff88803f799e00 by task swapper/1/0

CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.16.0-rc4-next-20250630 #1 PREEMPT(voluntary) 
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xca/0x120
 print_report+0xcb/0x670
 kasan_report+0xca/0x100
 kasan_check_range+0x39/0x1b0
 flush_tlb_func+0x24d/0x560
 __flush_smp_call_function_queue+0x20d/0x740
 flush_smp_call_function_queue+0x9c/0xf0
 do_idle+0x274/0x490
 cpu_startup_entry+0x4f/0x60
 start_secondary+0x1bd/0x210
 common_startup_64+0x13e/0x148
 </TASK>

Allocated by task 21621:
 kasan_save_stack+0x24/0x50
 kasan_save_track+0x14/0x30
 __kasan_slab_alloc+0x59/0x70
 kmem_cache_alloc_noprof+0x13c/0x470
 mm_alloc+0x1d/0xd0
 alloc_bprm+0x2e3/0x6e0
 do_execveat_common+0x235/0x770
 __x64_sys_execve+0x95/0xc0
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 273:
 kasan_save_stack+0x24/0x50
 kasan_save_track+0x14/0x30
 kasan_save_free_info+0x3a/0x60
 __kasan_slab_free+0x38/0x50
 kmem_cache_free+0x2a1/0x460
 finish_task_switch.isra.0+0x478/0x840
 __schedule+0xe4e/0x3520
 schedule+0xdb/0x390
 do_wait+0x32a/0x560
 kernel_waitid+0x101/0x170
 __do_sys_waitid+0x201/0x240
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88803f799480
 which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
 freed 2456-byte region [ffff88803f799480, ffff88803f799e18)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3f798
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88801dd88401
anon flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 0000000000000000 dead000000000001
raw: 0000000000000000 00000000000c000c 00000000f5000000 ffff88801dd88401
head: 0100000000000040 ffff888008c4bc80 0000000000000000 dead000000000001
head: 0000000000000000 00000000000c000c 00000000f5000000 ffff88801dd88401
head: 0100000000000003 ffffea0000fde601 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88803f799d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88803f799d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88803f799e00: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88803f799e80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
 ffff88803f799f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
random: crng reseeded on system resumption
Restarting kernel threads ...
Done restarting kernel threads.
random: crng reseeded on system resumption
Restarting kernel threads ...
Done restarting kernel threads.