==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6c7/0x900 kernel/bpf/stackmap.c:271
Write of size 72 at addr ffff888031582d90 by task syz.2.748/8875
CPU: 1 PID: 8875 Comm: syz.2.748 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_b5e50ceca154b88e+0x30/0x48
bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline]
__bpf_prog_run include/linux/filter.h:606 [inline]
bpf_prog_run include/linux/filter.h:624 [inline]
bpf_overflow_handler+0x43f/0x510 kernel/events/core.c:10584
__perf_event_overflow+0x461/0x660 kernel/events/core.c:9720
perf_event_overflow kernel/events/core.c:9741 [inline]
perf_swevent_hrtimer+0x437/0x610 kernel/events/core.c:11230
__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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xc0/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 3b f7 c1 f6 65 8b 05 ec b4 68 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc9001a397ae0 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a06 RCX: c3d59f47f3552d00
RDX: dffffc0000000000 RSI: ffffffff8acacce0 RDI: 0000000000000001
RBP: ffffc9001a397b70 R08: ffffffff8e8c316f R09: 1ffffffff1d1862d
R10: dffffc0000000000 R11: fffffbfff1d1862e R12: dffffc0000000000
R13: ffff8880b8f3cf98 R14: ffff8880187a4608 R15: 1ffff92003472f5c
class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:524 [inline]
try_to_wake_up+0x680/0x10e0 kernel/sched/core.c:4233
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: 0033:0x7f6c9959e159
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:00007f6c9a4ad0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f6c99825fa8 RCX: 00007f6c9959e159
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f6c99825fac
RBP: 00007f6c99825fa0 R08: 0000000000745d1e R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6c99826038 R14: 00007fff04db66a0 R15: 00007fff04db6788
Allocated by task 8875:
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:5473
__do_sys_bpf kernel/bpf/syscall.c:5595 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5593 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5593
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
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46
__kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
__call_rcu_common kernel/rcu/tree.c:2721 [inline]
call_rcu+0x153/0x900 kernel/rcu/tree.c:2837
nf_unregister_net_hook net/netfilter/core.c:-1 [inline]
nf_unregister_net_hooks+0xcb/0x130 net/netfilter/core.c:613
nf_defrag_ipv6_disable+0x95/0xe0 net/ipv6/netfilter/nf_defrag_ipv6_hooks.c:174
nf_ct_netns_do_put net/netfilter/nf_conntrack_proto.c:551 [inline]
nf_ct_netns_put+0x375/0x520 net/netfilter/nf_conntrack_proto.c:-1
nf_conncount_destroy+0x41/0x150 net/netfilter/nf_conncount.c:687
ovs_ct_limit_exit_finish net/openvswitch/conntrack.c:1614 [inline]
ovs_ct_exit_finish+0xa5/0x210 net/openvswitch/conntrack.c:2038
ovs_exit_net+0xed/0x7a0 net/openvswitch/datapath.c:2751
ops_exit_list net/core/net_namespace.c:173 [inline]
cleanup_net+0x6f7/0xb00 net/core/net_namespace.c:656
process_one_work kernel/workqueue.c:2657 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Second to last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46
__kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
__call_rcu_common kernel/rcu/tree.c:2721 [inline]
call_rcu+0x153/0x900 kernel/rcu/tree.c:2837
nf_hook_entries_free net/netfilter/core.c:88 [inline]
__nf_register_net_hook+0x787/0x910 net/netfilter/core.c:457
nf_register_net_hook+0xb2/0x190 net/netfilter/core.c:578
nf_register_net_hooks+0x44/0x1b0 net/netfilter/core.c:594
nf_ct_netns_do_get+0x213/0x5c0 net/netfilter/nf_conntrack_proto.c:481
nf_ct_netns_inet_get+0x3b/0x150 net/netfilter/nf_conntrack_proto.c:576
nf_conncount_init+0x127/0x380 net/netfilter/nf_conncount.c:639
ovs_ct_limit_init net/openvswitch/conntrack.c:1583 [inline]
ovs_ct_init+0x264/0x430 net/openvswitch/conntrack.c:2009
ovs_init_net+0x1e6/0x250 net/openvswitch/datapath.c:2702
ops_init+0x391/0x640 net/core/net_namespace.c:139
setup_net+0x3b6/0xa20 net/core/net_namespace.c:343
copy_net_ns+0x361/0x530 net/core/net_namespace.c:524
create_new_namespaces+0x3ce/0x700 kernel/nsproxy.c:110
copy_namespaces+0x42a/0x4a0 kernel/nsproxy.c:179
copy_process+0x16f6/0x3da0 kernel/fork.c:2513
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
The buggy address belongs to the object at ffff888031582d80
which belongs to the cache kmalloc-cg-64 of size 64
The buggy address is located 16 bytes inside of
allocated 40-byte region [ffff888031582d80, ffff888031582da8)
The buggy address belongs to the physical page:
page:ffffea0000c56080 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x31582
memcg:ffff88807da2c601
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888017c4da00 ffffea00017f3f00 0000000000000004
raw: 0000000000000000 0000000080200020 00000001ffffffff ffff88807da2c601
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 24864668142, free_ts 24857115096
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_pages_node include/linux/gfp.h:237 [inline]
alloc_slab_page+0x4f/0x180 mm/slub.c:1883
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
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc_node+0xa6/0x240 mm/slab_common.c:1014
kmalloc_node include/linux/slab.h:620 [inline]
__alloc kernel/bpf/memalloc.c:151 [inline]
alloc_bulk+0x447/0x6b0 kernel/bpf/memalloc.c:245
prefill_mem_cache kernel/bpf/memalloc.c:486 [inline]
bpf_mem_alloc_init+0x6c0/0x870 kernel/bpf/memalloc.c:554
bpf_global_ma_init+0x1a/0x40 kernel/bpf/core.c:3050
do_one_initcall+0x242/0x790 init/main.c:1210
do_initcall_level+0x13d/0x1f0 init/main.c:1272
do_initcalls+0x69/0xd0 init/main.c:1288
kernel_init_freeable+0x3d9/0x560 init/main.c:1525
kernel_init+0x1d/0x1c0 init/main.c:1415
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:2899
delayed_vfree_work+0x55/0x80 mm/vmalloc.c:2819
process_one_work kernel/workqueue.c:2657 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Memory state around the buggy address:
ffff888031582c80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888031582d00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888031582d80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff888031582e00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888031582e80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: c7 44 24 20 00 00 00 movl $0x0,0x20(%rsp)
7: 00
8: 9c pushf
9: 8f 44 24 20 pop 0x20(%rsp)
d: f7 44 24 20 00 02 00 testl $0x200,0x20(%rsp)
14: 00
15: 41 c6 04 07 f8 movb $0xf8,(%r15,%rax,1)
1a: 75 4b jne 0x67
1c: f7 c3 00 02 00 00 test $0x200,%ebx
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 3b f7 c1 f6 call 0xf6c1f76a <-- trapping instruction
2f: 65 8b 05 ec b4 68 75 mov %gs:0x7568b4ec(%rip),%eax # 0x7568b522
36: 85 c0 test %eax,%eax
38: 74 3c je 0x76
3a: 48 rex.W
3b: c7 .byte 0xc7
3c: 04 24 add $0x24,%al
3e: 0e (bad)
3f: 36 ss