R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffdd517549f R14: 00007f68811b4300 R15: 0000000000022000
 </TASK>
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff888017e065c0 by task syz-executor.6/4813

CPU: 1 UID: 0 PID: 4813 Comm: syz-executor.6 Not tainted 6.16.0-rc4-next-20250701 #1 PREEMPT(voluntary) 
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <IRQ>
 dump_stack_lvl+0xca/0x120
 print_report+0xcb/0x670
 kasan_report+0xca/0x100
 kasan_check_range+0x37/0x1a0
 flush_tlb_func+0x24d/0x560
 __flush_smp_call_function_queue+0x20d/0x740
 __sysvec_call_function_single+0x6d/0x360
 sysvec_call_function_single+0x5f/0xc0
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:handle_softirqs+0x174/0x770
Code: c8 83 83 3c 0a 00 00 01 c7 44 24 20 0a 00 00 00 48 89 44 24 18 65 66 c7 05 cf 84 47 06 00 00 e8 22 65 40 00 fb bb ff ff ff ff <48> c7 c5 c0 c0 a0 85 41 0f bc de 83 c3 01 0f 85 9b 00 00 00 e9 8d
RSP: 0018:ffff88806cf08f78 EFLAGS: 00000206
RAX: 0000000000000184 RBX: 00000000ffffffff RCX: 0000000000000008
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff88803cbaf148 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000182 R15: 0000000000000000
 __irq_exit_rcu+0xc4/0x100
 irq_exit_rcu+0x9/0x20
 sysvec_apic_timer_interrupt+0x70/0x80
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:dump_stack_lvl+0x115/0x120
Code: fc ff ff 4c 89 e2 31 f6 31 ff e8 e6 50 7b fc e8 d1 07 a5 fc 48 89 ee 31 ff e8 d7 a5 c4 fc e8 72 aa c4 fc e8 7d d4 cc fc fb 5b <5d> 41 5c e9 63 aa c4 fc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffff88803cbaf1f0 EFLAGS: 00000202
RAX: 000000000000017f RBX: ffffffff85d02180 RCX: 0000000000000080
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84aeec13
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: ffffffff8530f500
R13: ffffffff85d02190 R14: 0000000000000001 R15: 0000000000000000
 should_fail_ex+0x4d7/0x5e0
 should_fail_alloc_page+0xe0/0x110
 prepare_alloc_pages+0x1af/0x500
 __alloc_frozen_pages_noprof+0x17f/0x1f10
 alloc_pages_mpol+0xed/0x340
 alloc_pages_noprof+0xa1/0x380
 __pmd_alloc+0x3b/0x980
 __handle_mm_fault+0xcae/0x30f0
 handle_mm_fault+0x2c3/0x900
 do_user_addr_fault+0x395/0xeb0
 exc_page_fault+0xb0/0x180
 asm_exc_page_fault+0x26/0x30
RIP: 0010:rep_movs_alternative+0x54/0x90
Code: 00 00 00 00 66 90 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 eb 05 e9 7f 87 03 00 48 8b 06 <48> 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 c7 48 01 c6 48 29
RSP: 0018:ffff88803cbaf8d0 EFLAGS: 00050206
RAX: f003f002f001f000 RBX: 0000000000000200 RCX: 0000000000000200
RDX: ffffed1007975f66 RSI: ffff88803cbaf930 RDI: 0000000020000000
RBP: 0000000020000000 R08: 0000000000000000 R09: ffffed1007975f65
R10: ffff88803cbafb2f R11: 0000000000000000 R12: ffff88803cbaf930
R13: 0000000020000200 R14: 00007ffffffff000 R15: 0000000000000000
 _copy_to_user+0xbe/0xd0
 con_get_trans_new+0x9c/0x100
 vt_ioctl+0x1893/0x2db0
 tty_ioctl+0x78b/0x17d0
 __x64_sys_ioctl+0x18f/0x210
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6883c3eb19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f68811b4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6883d51f60 RCX: 00007f6883c3eb19
RDX: 0000000020000000 RSI: 0000000000004b69 RDI: 0000000000000003
RBP: 00007f68811b41d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffdd517549f R14: 00007f68811b4300 R15: 0000000000022000
 </TASK>

loop7: detected capacity change from 0 to 512
Allocated by task 284:
EXT4-fs (loop7): VFS: Can't find ext4 filesystem
 kasan_save_stack+0x24/0x50
 kasan_save_track+0x14/0x30
 __kasan_slab_alloc+0x59/0x70
 kmem_cache_alloc_noprof+0x13e/0x470
 copy_process+0x6f3a/0x73e0
 kernel_clone+0xea/0x820
 __do_sys_clone+0xce/0x120
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 4804:
 kasan_save_stack+0x24/0x50
 kasan_save_track+0x14/0x30
 kasan_save_free_info+0x3c/0x90
 __kasan_slab_free+0x3c/0x60
 kmem_cache_free+0x2a5/0x460
 mmput+0x305/0x390
 do_exit+0x79d/0x2970
 do_group_exit+0xd3/0x2a0
 get_signal+0x2315/0x2340
 arch_do_signal_or_restart+0x80/0x790
 exit_to_user_mode_loop+0x8b/0x100
 do_syscall_64+0x2f7/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888017e05c40
 which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
 freed 2456-byte region [ffff888017e05c40, ffff888017e065d8)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x17e00
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800eb48381
anon flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 ffffea000064e600 dead000000000003
raw: 0000000000000000 00000000000c000c 00000000f5000000 ffff88800eb48381
head: 0100000000000040 ffff888008c4bc80 ffffea000064e600 dead000000000003
head: 0000000000000000 00000000000c000c 00000000f5000000 ffff88800eb48381
head: 0100000000000003 ffffea00005f8001 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888017e06480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888017e06500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888017e06580: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
                                           ^
 ffff888017e06600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888017e06680: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
loop7: detected capacity change from 0 to 512
EXT4-fs: Ignoring removed i_version option
EXT4-fs (loop7): VFS: Can't find ext4 filesystem
loop7: detected capacity change from 0 to 512
EXT4-fs: Ignoring removed i_version option
EXT4-fs (loop7): VFS: Can't find ext4 filesystem
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
CPU: 1 UID: 0 PID: 4850 Comm: syz-executor.6 Tainted: G    B               6.16.0-rc4-next-20250701 #1 PREEMPT(voluntary) 
Tainted: [B]=BAD_PAGE
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xfa/0x120
 should_fail_ex+0x4d7/0x5e0
 should_failslab+0xc2/0x120
 kmem_cache_alloc_noprof+0x5f/0x470
 __pmd_alloc+0x98/0x980
 __handle_mm_fault+0xcae/0x30f0
 handle_mm_fault+0x2c3/0x900
 do_user_addr_fault+0x395/0xeb0
 exc_page_fault+0xb0/0x180
 asm_exc_page_fault+0x26/0x30
RIP: 0010:rep_movs_alternative+0x54/0x90
Code: 00 00 00 00 66 90 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 eb 05 e9 7f 87 03 00 48 8b 06 <48> 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 c7 48 01 c6 48 29
RSP: 0018:ffff88803cee78d0 EFLAGS: 00050206
RAX: f003f002f001f000 RBX: 0000000000000200 RCX: 0000000000000200
RDX: ffffed10079dcf66 RSI: ffff88803cee7930 RDI: 0000000020000000
RBP: 0000000020000000 R08: 0000000000000000 R09: ffffed10079dcf65
R10: ffff88803cee7b2f R11: 0000000000000000 R12: ffff88803cee7930
R13: 0000000020000200 R14: 00007ffffffff000 R15: 0000000000000000
 _copy_to_user+0xbe/0xd0
 con_get_trans_new+0x9c/0x100
 vt_ioctl+0x1893/0x2db0
 tty_ioctl+0x78b/0x17d0
 __x64_sys_ioctl+0x18f/0x210
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6883c3eb19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f68811b4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6883d51f60 RCX: 00007f6883c3eb19
RDX: 0000000020000000 RSI: 0000000000004b69 RDI: 0000000000000003
RBP: 00007f68811b41d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffdd517549f R14: 00007f68811b4300 R15: 0000000000022000
 </TASK>
loop7: detected capacity change from 0 to 512
EXT4-fs: Ignoring removed i_version option
EXT4-fs (loop7): VFS: Can't find ext4 filesystem
----------------
Code disassembly (best guess):
   0:	c8 83 83 3c          	enterq $0x8383,$0x3c
   4:	0a 00                	or     (%rax),%al
   6:	00 01                	add    %al,(%rcx)
   8:	c7 44 24 20 0a 00 00 	movl   $0xa,0x20(%rsp)
   f:	00
  10:	48 89 44 24 18       	mov    %rax,0x18(%rsp)
  15:	65 66 c7 05 cf 84 47 	movw   $0x0,%gs:0x64784cf(%rip)        # 0x64784ee
  1c:	06 00 00
  1f:	e8 22 65 40 00       	callq  0x406546
  24:	fb                   	sti
  25:	bb ff ff ff ff       	mov    $0xffffffff,%ebx
* 2a:	48 c7 c5 c0 c0 a0 85 	mov    $0xffffffff85a0c0c0,%rbp <-- trapping instruction
  31:	41 0f bc de          	bsf    %r14d,%ebx
  35:	83 c3 01             	add    $0x1,%ebx
  38:	0f 85 9b 00 00 00    	jne    0xd9
  3e:	e9                   	.byte 0xe9
  3f:	8d                   	.byte 0x8d