R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe96d3eabf R14: 00007f168a9e3300 R15: 0000000000022000
==================================================================
BUG: KASAN: slab-use-after-free in flush_tlb_func+0x24d/0x560
Write of size 8 at addr ffff88801669bcc0 by task syz-executor.0/11011
CPU: 1 UID: 0 PID: 11011 Comm: syz-executor.0 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+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: 00000216
RAX: 00000000000001a0 RBX: 00000000ffffffff RCX: ffffffff817bbfa6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813b5b6e
RBP: ffff8880167cf928 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000202 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:dump_stack_lvl+0x115/0x120
Code: fc ff ff 4c 89 e2 31 f6 31 ff e8 e6 40 7b fc e8 e1 f7 a4 fc 48 89 ee 31 ff e8 d7 95 c4 fc e8 72 9a c4 fc e8 7d c4 cc fc fb 5b <5d> 41 5c e9 63 9a c4 fc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffff8880167cf9d8 EFLAGS: 00000202
RAX: 000000000000019d RBX: 1ffff11002cf9f42 RCX: ffffffff817bbfa6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84aefc13
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86438657 R11: 0000000000000001 R12: ffffffff8530f500
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff888015dcb700
warn_alloc+0x211/0x360
__vmalloc_node_range_noprof+0xf90/0x13e0
__vmalloc_node_noprof+0xac/0xf0
bpf_prog_alloc_no_stats+0x55/0x440
bpf_prog_alloc+0x39/0x200
bpf_prog_create_from_user+0xb2/0x2f0
do_seccomp+0x349/0x25e0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f168d46db19
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:00007f168a9e3188 EFLAGS: 00000246 ORIG_RAX: 000000000000013d
RAX: ffffffffffffffda RBX: 00007f168d580f60 RCX: 00007f168d46db19
RDX: 0000000020000080 RSI: 0000000000000008 RDI: 0000000000000001
RBP: 00007f168a9e31d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe96d3eabf R14: 00007f168a9e3300 R15: 0000000000022000
Allocated by task 286:
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 11007:
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 ffff88801669b340
which belongs to the cache mm_struct of size 2456
The buggy address is located 2432 bytes inside of
freed 2456-byte region [ffff88801669b340, ffff88801669bcd8)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16698
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800cc75081
flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008c4bc80 dead000000000100 dead000000000122
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800cc75081
head: 0100000000000040 ffff888008c4bc80 dead000000000100 dead000000000122
head: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800cc75081
head: 0100000000000003 ffffea000059a601 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88801669bb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801669bc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801669bc80: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
^
ffff88801669bd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801669bd80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Mem-Info:
active_anon:59 inactive_anon:30454 isolated_anon:0
active_file:8319 inactive_file:43216 isolated_file:0
unevictable:0 dirty:306 writeback:0
slab_reclaimable:5457 slab_unreclaimable:52186
mapped:81305 shmem:102 pagetables:2123
sec_pagetables:0 bounce:0
kernel_misc_reclaimable:0
free:192168 free_pcp:1060 free_cma:0
Node 0 active_anon:236kB inactive_anon:121816kB active_file:33276kB inactive_file:172864kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:325220kB dirty:1224kB writeback:0kB shmem:408kB kernel_stack:5120kB pagetables:8492kB sec_pagetables:0kB all_unreclaimable? no Balloon:0kB
Node 0 DMA free:15360kB boost:0kB min:44kB low:56kB high:68kB reserved_highatomic:0KB free_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
lowmem_reserve[]: 0 1601 1601 1601
Node 0 DMA32 free:753312kB boost:0kB min:5076kB low:6700kB high:8324kB reserved_highatomic:0KB free_highatomic:0KB active_anon:236kB inactive_anon:121816kB active_file:33276kB inactive_file:172864kB unevictable:0kB writepending:1224kB present:2080640kB managed:1639736kB mlocked:0kB bounce:0kB free_pcp:4432kB local_pcp:1928kB free_cma:0kB
lowmem_reserve[]: 0 0 0 0
Node 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) = 15360kB
Node 0 DMA32: 225*4kB (UME) 75*8kB (UM) 55*16kB (UME) 56*32kB (UME) 10*64kB (UME) 56*128kB (UM) 20*256kB (UME) 8*512kB (UM) 3*1024kB (ME) 2*2048kB (M) 177*4096kB (UM) = 753356kB
Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
21396 total pagecache pages
0 pages in swap cache
Free swap = 0kB
Total swap = 0kB
524158 pages RAM
0 pages HighMem/MovableOnly
110384 pages reserved
audit: type=1326 audit(1751356550.153:128): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=11021 comm="syz-executor.1" exe="/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7efe8819ab19 code=0x0
audit: type=1326 audit(1751356558.834:129): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=11043 comm="syz-executor.1" exe="/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7efe8819ab19 code=0x0
----------------
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