==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6c7/0x900 kernel/bpf/stackmap.c:271
Write of size 104 at addr ffff8880793dc610 by task syz.2.1216/8859
CPU: 0 PID: 8859 Comm: syz.2.1216 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x241/0x290 mm/kasan/generic.c:187
__asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
__bpf_get_stackid+0x6c7/0x900 kernel/bpf/stackmap.c:271
____bpf_get_stackid_pe kernel/bpf/stackmap.c:362 [inline]
bpf_get_stackid_pe+0x343/0x410 kernel/bpf/stackmap.c:331
bpf_prog_b14f7977a0544f6b+0x30/0x45
bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline]
__bpf_prog_run include/linux/filter.h:617 [inline]
bpf_prog_run include/linux/filter.h:624 [inline]
bpf_overflow_handler+0x1fc/0x510 kernel/events/core.c:10576
__perf_event_overflow+0x461/0x660 kernel/events/core.c:9712
perf_event_overflow kernel/events/core.c:9733 [inline]
perf_swevent_hrtimer+0x437/0x610 kernel/events/core.c:11222
__run_hrtimer kernel/time/hrtimer.c:1754 [inline]
__hrtimer_run_queues+0x4e8/0xc10 kernel/time/hrtimer.c:1818
hrtimer_interrupt+0x39d/0x980 kernel/time/hrtimer.c:1880
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:finish_task_switch+0x267/0x8f0 kernel/sched/core.c:5256
Code: 31 09 85 c0 0f 84 30 01 00 00 48 85 db 0f 85 4f 01 00 00 0f 1f 44 00 00 4c 89 e7 e8 23 f7 3a 09 e8 be 19 30 00 fb 4c 8b 65 b8 <49> 8d bc 24 00 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0
RSP: 0018:ffffc9000b5cf800 EFLAGS: 00000286
RAX: 64effe686c6bd700 RBX: 0000000000000000 RCX: 64effe686c6bd700
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: ffffffff8b1d32e0
RBP: ffffc9000b5cf850 R08: ffffffff8e8c772f R09: 1ffffffff1d18ee5
R10: dffffc0000000000 R11: fffffbfff1d18ee6 R12: ffff88801dfe5a00
R13: 1ffff110171c79a9 R14: dffffc0000000000 R15: ffff8880b8e3cd48
context_switch kernel/sched/core.c:5385 [inline]
__schedule+0x15b6/0x4660 kernel/sched/core.c:6701
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6868
preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6892
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
class_preempt_destructor include/linux/preempt.h:478 [inline]
try_to_wake_up+0x6f5/0x10e0 kernel/sched/core.c:4356
wake_up_process kernel/sched/core.c:4481 [inline]
wake_up_q+0xb6/0x100 kernel/sched/core.c:1032
futex_wake+0x42a/0x4f0 kernel/futex/waitwake.c:184
do_futex+0x35d/0x3e0 kernel/futex/syscalls.c:139
__do_sys_futex kernel/futex/syscalls.c:211 [inline]
__se_sys_futex+0x3a9/0x440 kernel/futex/syscalls.c:192
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f065df9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f065ee780e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f065e225fa8 RCX: 00007f065df9e0d9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f065e225fac
RBP: 00007f065e225fa0 R08: 0000000000745a54 R09: 0000000000000000
R10: 00000000000002f0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f065e226038 R14: 00007ffefb0d2580 R15: 00007ffefb0d2668
Allocated by task 8859:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
____kasan_kmalloc mm/kasan/common.c:375 [inline]
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
kasan_kmalloc include/linux/kasan.h:198 [inline]
__do_kmalloc_node mm/slab_common.c:1007 [inline]
__kmalloc_node+0xb6/0x240 mm/slab_common.c:1014
kmalloc_node include/linux/slab.h:620 [inline]
__bpf_map_area_alloc kernel/bpf/syscall.c:303 [inline]
bpf_map_area_alloc+0x5e/0x110 kernel/bpf/syscall.c:316
prealloc_elems_and_freelist+0x86/0x1c0 kernel/bpf/stackmap.c:51
stack_map_alloc+0x32b/0x4b0 kernel/bpf/stackmap.c:114
map_create+0x877/0x12f0 kernel/bpf/syscall.c:1247
__sys_bpf+0x651/0x890 kernel/bpf/syscall.c:5460
__do_sys_bpf kernel/bpf/syscall.c:5582 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5580 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5580
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
The buggy address belongs to the object at ffff8880793dc600
which belongs to the cache kmalloc-cg-64 of size 64
The buggy address is located 16 bytes inside of
allocated 40-byte region [ffff8880793dc600, ffff8880793dc628)
The buggy address belongs to the physical page:
page:ffffea0001e4f700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x793dc
memcg:ffff888030677201
ksm flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888017c4da00 ffffea0000b466c0 0000000000000007
raw: 0000000000000000 0000000080200020 00000001ffffffff ffff888030677201
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5775, tgid 5775 (syz-executor), ts 85634290892, free_ts 85633855766
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582
prep_new_page mm/page_alloc.c:1589 [inline]
get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501
alloc_slab_page+0x5d/0x180 mm/slub.c:1881
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
__kmem_cache_alloc_node+0x11f/0x250 mm/slub.c:3534
kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098
kmalloc include/linux/slab.h:600 [inline]
alloc_fdtable+0xca/0x2c0 fs/file.c:147
dup_fd+0x747/0xa20 fs/file.c:346
copy_files+0xaf/0x110 kernel/fork.c:1802
copy_process+0x157d/0x3da0 kernel/fork.c:2498
kernel_clone+0x24b/0x8a0 kernel/fork.c:2919
__do_sys_clone kernel/fork.c:3062 [inline]
__se_sys_clone kernel/fork.c:3046 [inline]
__x64_sys_clone+0x1b7/0x230 kernel/fork.c:3046
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1182 [inline]
free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
vfree+0x1a7/0x340 mm/vmalloc.c:2868
__do_replace+0x878/0x9b0 net/ipv6/netfilter/ip6_tables.c:1105
do_replace net/ipv6/netfilter/ip6_tables.c:1156 [inline]
do_ip6t_set_ctl+0xb41/0xe10 net/ipv6/netfilter/ip6_tables.c:1641
nf_setsockopt+0x263/0x280 net/netfilter/nf_sockopt.c:101
do_sock_setsockopt+0x175/0x1a0 net/socket.c:2322
__sys_setsockopt net/socket.c:2345 [inline]
__do_sys_setsockopt net/socket.c:2354 [inline]
__se_sys_setsockopt net/socket.c:2351 [inline]
__x64_sys_setsockopt+0x182/0x200 net/socket.c:2351
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Memory state around the buggy address:
ffff8880793dc500: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8880793dc580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8880793dc600: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff8880793dc680: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8880793dc700: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 31 09 xor %ecx,(%rcx)
2: 85 c0 test %eax,%eax
4: 0f 84 30 01 00 00 je 0x13a
a: 48 85 db test %rbx,%rbx
d: 0f 85 4f 01 00 00 jne 0x162
13: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
18: 4c 89 e7 mov %r12,%rdi
1b: e8 23 f7 3a 09 call 0x93af743
20: e8 be 19 30 00 call 0x3019e3
25: fb sti
26: 4c 8b 65 b8 mov -0x48(%rbp),%r12
* 2a: 49 8d bc 24 00 16 00 lea 0x1600(%r12),%rdi <-- trapping instruction
31: 00
32: 48 89 f8 mov %rdi,%rax
35: 48 c1 e8 03 shr $0x3,%rax
39: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax
3e: 84 c0 test %al,%al