==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 32 at addr ffff888131c54290 by task syz.2.724/2727
CPU: 0 PID: 2727 Comm: syz.2.724 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
__dump_stack+0x21/0x24 lib/dump_stack.c:88
dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
print_address_description+0x71/0x200 mm/kasan/report.c:316
print_report+0x4a/0x60 mm/kasan/report.c:420
kasan_report+0x122/0x150 mm/kasan/report.c:524
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
memcpy+0x44/0x70 mm/kasan/shadow.c:66
__bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline]
bpf_get_stackid_pe+0x2ee/0x400 kernel/bpf/stackmap.c:334
bpf_prog_7073f9780ce25fb5+0x21/0x39
bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
__bpf_prog_run include/linux/filter.h:607 [inline]
bpf_prog_run include/linux/filter.h:614 [inline]
bpf_overflow_handler+0x3d0/0x5e0 kernel/events/core.c:10238
__perf_event_overflow+0x437/0x620 kernel/events/core.c:9448
perf_swevent_hrtimer+0x400/0x5b0 kernel/events/core.c:10879
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x3bb/0x8e0 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3c7/0x8c0 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x11e/0x440 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:should_fail_ex+0x41/0x520 lib/fault-inject.c:119
Code: 49 89 fe 48 ba 00 00 00 00 00 fc ff df 65 8b 05 2d 32 76 7d a9 00 01 ff 00 0f 84 fa 00 00 00 4c 89 f3 48 c1 eb 03 80 3c 13 00 <74> 0e 4c 89 f7 49 89 d4 e8 b2 8f 2a ff 4c 89 e2 49 83 3e 00 0f 84
RSP: 0018:ffffc90001d3f9f8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffffffff0e39c08 RCX: ffff88812103e540
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff871ce040
RBP: ffffc90001d3fa40 R08: ffffc90001d3fbf7 R09: ffffc90001d3fbe0
R10: dffffc0000000000 R11: fffff520003a7f7f R12: ffff88812103f04c
R13: 0000000000000000 R14: ffffffff871ce040 R15: 0000000000000001
should_fail+0xb/0x10 lib/fault-inject.c:157
should_fail_futex kernel/futex/core.c:83 [inline]
get_futex_key+0x143/0xb10 kernel/futex/core.c:241
futex_wake+0x150/0x8e0 kernel/futex/waitwake.c:156
do_futex+0x2bf/0x430 kernel/futex/syscalls.c:141
__do_sys_futex kernel/futex/syscalls.c:213 [inline]
__se_sys_futex+0x136/0x310 kernel/futex/syscalls.c:194
__x64_sys_futex+0xe5/0x100 kernel/futex/syscalls.c:194
x64_sys_call+0x7ec/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:203
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2ac2b9c819
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:00007f2ac3a550e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f2ac2e15fa8 RCX: 00007f2ac2b9c819
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f2ac2e15fac
RBP: 00007f2ac2e15fa0 R08: 002b047376ddeccc R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2ac2e16038 R14: 00007ffe58d3f020 R15: 00007ffe58d3f108
Allocated by task 2727:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505
____kasan_kmalloc mm/kasan/common.c:380 [inline]
__kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
kasan_kmalloc include/linux/kasan.h:212 [inline]
__do_kmalloc_node mm/slab_common.c:938 [inline]
__kmalloc_node+0xb2/0x1e0 mm/slab_common.c:945
kmalloc_node include/linux/slab.h:589 [inline]
__bpf_map_area_alloc kernel/bpf/syscall.c:328 [inline]
bpf_map_area_alloc+0x4b/0xe0 kernel/bpf/syscall.c:341
prealloc_elems_and_freelist+0x8a/0x1e0 kernel/bpf/stackmap.c:51
stack_map_alloc+0x3a7/0x530 kernel/bpf/stackmap.c:117
find_and_alloc_map kernel/bpf/syscall.c:133 [inline]
map_create+0x49c/0xd80 kernel/bpf/syscall.c:1126
__sys_bpf+0x34e/0x850 kernel/bpf/syscall.c:4987
__do_sys_bpf kernel/bpf/syscall.c:5109 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5107 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5107
x64_sys_call+0x488/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
The buggy address belongs to the object at ffff888131c54280
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
32-byte region [ffff888131c54280, ffff888131c542a0)
The buggy address belongs to the physical page:
page:ffffea0004c71500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x131c54
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea00047ede00 dead000000000003 ffff888100042600
raw: 0000000000000000 0000000080400040 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 6, tgid 6 (kworker/0:0), ts 24187725704, free_ts 0
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2670
prep_new_page+0x1c/0x110 mm/page_alloc.c:2677
get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4583
__alloc_pages+0x1fa/0x610 mm/page_alloc.c:5924
alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
allocate_slab mm/slub.c:1967 [inline]
new_slab+0x98/0x3d0 mm/slub.c:2020
___slab_alloc+0x6bd/0xb20 mm/slub.c:3177
__slab_alloc+0x5e/0xa0 mm/slub.c:3263
slab_alloc_node mm/slub.c:3348 [inline]
__kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3423
kmalloc_trace+0x29/0xb0 mm/slab_common.c:1028
kmalloc include/linux/slab.h:563 [inline]
kzalloc include/linux/slab.h:699 [inline]
ref_tracker_alloc+0x169/0x4a0 lib/ref_tracker.c:85
__netdev_tracker_alloc include/linux/netdevice.h:4085 [inline]
netdev_hold include/linux/netdevice.h:4114 [inline]
___neigh_create+0xbab/0x1e20 net/core/neighbour.c:657
__neigh_create+0x31/0x40 net/core/neighbour.c:737
ip6_finish_output2+0xa56/0x18a0 net/ipv6/ip6_output.c:129
__ip6_finish_output net/ipv6/ip6_output.c:205 [inline]
ip6_finish_output+0x5f9/0xbb0 net/ipv6/ip6_output.c:216
NF_HOOK_COND include/linux/netfilter.h:294 [inline]
ip6_output+0x1fa/0x410 net/ipv6/ip6_output.c:237
page_owner free stack trace missing
Memory state around the buggy address:
ffff888131c54180: 00 00 00 fc fc fc fc fc 00 00 00 00 fc fc fc fc
ffff888131c54200: 00 00 01 fc fc fc fc fc 00 00 00 00 fc fc fc fc
>ffff888131c54280: 00 00 00 fc fc fc fc fc 00 00 00 00 fc fc fc fc
^
ffff888131c54300: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
ffff888131c54380: 00 00 04 fc fc fc fc fc 00 00 00 00 fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 49 89 fe mov %rdi,%r14
3: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
a: fc ff df
d: 65 8b 05 2d 32 76 7d mov %gs:0x7d76322d(%rip),%eax # 0x7d763241
14: a9 00 01 ff 00 test $0xff0100,%eax
19: 0f 84 fa 00 00 00 je 0x119
1f: 4c 89 f3 mov %r14,%rbx
22: 48 c1 eb 03 shr $0x3,%rbx
26: 80 3c 13 00 cmpb $0x0,(%rbx,%rdx,1)
* 2a: 74 0e je 0x3a <-- trapping instruction
2c: 4c 89 f7 mov %r14,%rdi
2f: 49 89 d4 mov %rdx,%r12
32: e8 b2 8f 2a ff call 0xff2a8fe9
37: 4c 89 e2 mov %r12,%rdx
3a: 49 83 3e 00 cmpq $0x0,(%r14)
3e: 0f .byte 0xf
3f: 84 .byte 0x84