R10: 0000000020008003 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc31120eff R14: 00007f6b20031300 R15: 0000000000022000
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff8880172d5b80 by task syz-executor.0/18650
CPU: 1 UID: 0 PID: 18650 Comm: syz-executor.0 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+0xa1/0xc0
asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:dump_stack_lvl+0x115/0x120
Code: fc ff ff 4c 89 e2 31 f6 31 ff e8 26 31 7b fc e8 e1 e7 a4 fc 48 89 ee 31 ff e8 f7 8b c4 fc e8 92 90 c4 fc e8 9d ba cc fc fb 5b <5d> 41 5c e9 83 90 c4 fc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffff888037107280 EFLAGS: 00000202
RAX: 0000000000000116 RBX: ffffffff85d01f60 RCX: 0000000000000004
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84af0c13
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86439057 R11: 0000000000000001 R12: ffffffff8530fc40
R13: ffffffff85d01f70 R14: 0000000000000000 R15: 0000000000000000
should_fail_ex+0x4d7/0x5e0
should_failslab+0xc2/0x120
kmem_cache_alloc_noprof+0x5f/0x470
inet_bind2_bucket_create+0x36/0x590
__inet_hash_connect+0x12ff/0x1af0
tcp_v6_connect+0x12c9/0x1ba0
__inet_stream_connect+0x3a5/0xed0
tcp_sendmsg_fastopen+0x3df/0x700
tcp_sendmsg_locked+0x86f/0x3840
tcp_sendmsg+0x2f/0x50
inet6_sendmsg+0xb9/0x150
____sys_sendmsg+0x7b2/0xc20
___sys_sendmsg+0x10f/0x1b0
__sys_sendmmsg+0x1f5/0x420
__x64_sys_sendmmsg+0x9d/0x110
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6b22abbb19
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:00007f6b20031188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f6b22bcef60 RCX: 00007f6b22abbb19
RDX: 0000000000000001 RSI: 0000000020002bc0 RDI: 0000000000000003
RBP: 00007f6b200311d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020008003 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc31120eff R14: 00007f6b20031300 R15: 0000000000022000
Allocated by task 14088:
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 18633:
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 ffff8880172d5200
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff8880172d5200, ffff8880172d5b98)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x172d0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800e05c881
flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 ffffea000059e200 dead000000000004
raw: 0000000000000000 00000000000c000c 00000000f5000000 ffff88800e05c881
head: 0100000000000040 ffff888008c4bc80 ffffea000059e200 dead000000000004
head: 0000000000000000 00000000000c000c 00000000f5000000 ffff88800e05c881
head: 0100000000000003 ffffea00005cb401 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880172d5a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880172d5b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880172d5b80: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8880172d5c00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
ffff8880172d5c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.4'.
----------------
Code disassembly (best guess), 2 bytes skipped:
0: ff 4c 89 e2 decl -0x1e(%rcx,%rcx,4)
4: 31 f6 xor %esi,%esi
6: 31 ff xor %edi,%edi
8: e8 26 31 7b fc callq 0xfc7b3133
d: e8 e1 e7 a4 fc callq 0xfca4e7f3
12: 48 89 ee mov %rbp,%rsi
15: 31 ff xor %edi,%edi
17: e8 f7 8b c4 fc callq 0xfcc48c13
1c: e8 92 90 c4 fc callq 0xfcc490b3
21: e8 9d ba cc fc callq 0xfcccbac3
26: fb sti
27: 5b pop %rbx
* 28: 5d pop %rbp <-- trapping instruction
29: 41 5c pop %r12
2b: e9 83 90 c4 fc jmpq 0xfcc490b3
30: 0f 1f 00 nopl (%rax)
33: 90 nop
34: 90 nop
35: 90 nop
36: 90 nop
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop