==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff88801554db80 by task syz-executor.5/7343
CPU: 0 UID: 0 PID: 7343 Comm: syz-executor.5 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:
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:generic_exec_single+0x1dd/0x2c0
Code: e8 e8 82 13 00 31 f6 48 89 ef e8 be d7 ff ff 4c 89 ef e8 c6 5e 52 03 31 f6 48 89 ef e8 4c d9 ff ff e8 27 81 13 00 fb 45 31 e4 ae fe ff ff e8 09 57 0b 00 90 0f 0b 90 e9 45 ff ff ff 4c 89 f7
RSP: 0018:ffff88803fb3faf0 EFLAGS: 00000246
RAX: 000000000000004f RBX: 0000000000000200 RCX: 0000000000000040
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff81683f69
RBP: ffffffff81845700 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: 0000000000000000
R13: ffff88803fb3fc28 R14: ffff88803fb3fb68 R15: ffff8880364b0014
smp_call_function_single+0x327/0x420
task_function_call+0xe4/0x170
perf_install_in_context+0x2ca/0x570
__do_sys_perf_event_open+0x19a6/0x2c60
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f49cd825b19
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:00007f49cad9b188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f49cd938f60 RCX: 00007f49cd825b19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000340
RBP: 00007f49cd87ff6d R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff9ed89b6f R14: 00007f49cad9b300 R15: 0000000000022000
Allocated by task 283:
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 7332:
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
__x64_sys_exit_group+0x3e/0x50
x64_sys_call+0xf76/0x18a0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88801554d200
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff88801554d200, ffff88801554db98)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x15548
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800edc3a81
anon flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 ffffea000028f400 dead000000000003
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800edc3a81
head: 0100000000000040 ffff888008c4bc80 ffffea000028f400 dead000000000003
head: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800edc3a81
head: 0100000000000003 ffffea0000555201 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88801554da80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801554db00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801554db80: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88801554dc00: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
ffff88801554dc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
loop7: detected capacity change from 0 to 10
vfat: Unknown parameter 'Q‚[ '
loop7: detected capacity change from 0 to 10
vfat: Unknown parameter 'Q‚[ '
perf: interrupt took too long (3291 > 3186), lowering kernel.perf_event_max_sample_rate to 60000
loop7: detected capacity change from 0 to 10
vfat: Unknown parameter 'Q‚[ '
audit: type=1326 audit(1751360780.331:18): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=7405 comm="syz-executor.3" exe="/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f4e358f9b19 code=0x0
loop7: detected capacity change from 0 to 10
vfat: Unknown parameter 'Q‚[ '
audit: type=1326 audit(1751360781.162:19): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=7405 comm="syz-executor.3" exe="/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f4e358f9b19 code=0x0
----------------
Code disassembly (best guess):
0: e8 e8 82 13 00 callq 0x1382ed
5: 31 f6 xor %esi,%esi
7: 48 89 ef mov %rbp,%rdi
a: e8 be d7 ff ff callq 0xffffd7cd
f: 4c 89 ef mov %r13,%rdi
12: e8 c6 5e 52 03 callq 0x3525edd
17: 31 f6 xor %esi,%esi
19: 48 89 ef mov %rbp,%rdi
1c: e8 4c d9 ff ff callq 0xffffd96d
21: e8 27 81 13 00 callq 0x13814d
26: fb sti
27: 45 31 e4 xor %r12d,%r12d
* 2a: e9 ae fe ff ff jmpq 0xfffffedd <-- trapping instruction
2f: e8 09 57 0b 00 callq 0xb573d
34: 90 nop
35: 0f 0b ud2
37: 90 nop
38: e9 45 ff ff ff jmpq 0xffffff82
3d: 4c 89 f7 mov %r14,%rdi