R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff3ee412cf R14: 00007fcd2703f300 R15: 0000000000022000
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff888008c63280 by task syz-executor.4/19641
CPU: 1 UID: 0 PID: 19641 Comm: syz-executor.4 Not tainted 6.16.0-rc4-next-20250702 #1 PREEMPT(voluntary)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
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
__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 b4 47 06 00 00 e8 42 6b 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: 00000202
RAX: 0000000000094b02 RBX: 00000000ffffffff RCX: ffffffff817bc5c6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff88803c84fa18 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86439057 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000380 R15: 0000000000000000
__irq_exit_rcu+0xc4/0x100
irq_exit_rcu+0x9/0x20
sysvec_apic_timer_interrupt+0x70/0x80
asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:finish_task_switch.isra.0+0x20f/0x840
Code: 4c 89 ff 48 c7 03 00 00 00 00 e8 3c bb 73 03 4d 85 e4 75 ba 4c 89 ff e8 9f a1 73 03 e8 1a d4 34 00 fb 65 48 8b 1d 79 1d 3c 06 <48> 8d bb f0 14 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffff88803c84fac0 EFLAGS: 00000206
RAX: 0000000000094aff RBX: ffff88800b380000 RCX: ffffffff817bc5c6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8146f296
RBP: ffff88803c84fb00 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86439057 R11: 0000000000000001 R12: ffff88806cf36f18
R13: ffff88800984d280 R14: ffff88806cf36f00 R15: ffff88806cf36f00
__schedule+0xe4e/0x3520
schedule+0xdb/0x390
do_nanosleep+0x15e/0x560
hrtimer_nanosleep+0x13a/0x340
common_nsleep+0xaa/0xd0
__x64_sys_clock_nanosleep+0x331/0x470
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1dc89588e1
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 aa e7 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 e3 e7 ff ff 48 8b 04 24 eb 97 66 2e 0f 1f
RSP: 002b:00007ffcd2557950 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00000000000000da RCX: 00007f1dc89588e1
RDX: 00007ffcd2557990 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffcd2557a1c R08: 0000000000000000 R09: 00007f1dc8a23000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
R13: 000000000027c33b R14: 0000000000000002 R15: 00007ffcd2557a80
Allocated by task 15062:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_slab_alloc+0x59/0x70
kmem_cache_alloc_noprof+0x13c/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 22488:
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
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 ffff888008c62900
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff888008c62900, ffff888008c63298)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8c60
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800d4f0581
anon flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 ffffea00003d1800 dead000000000003
raw: 0000000000000000 00000000000c000c 00000000f5000000 ffff88800d4f0581
head: 0100000000000040 ffff888008c4bc80 ffffea00003d1800 dead000000000003
head: 0000000000000000 00000000000c000c 00000000f5000000 ffff88800d4f0581
head: 0100000000000003 ffffea0000231801 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888008c63180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888008c63200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888008c63280: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff888008c63300: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
ffff888008c63380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
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 b4 47 movw $0x0,%gs:0x647b4cf(%rip) # 0x647b4ee
1c: 06 00 00
1f: e8 42 6b 40 00 callq 0x406b66
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