==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6bf/0x900 kernel/bpf/stackmap.c:271
Write of size 104 at addr ffff88805e1e1490 by task syz.0.6744/26270
CPU: 1 PID: 26270 Comm: syz.0.6744 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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+0x6bf/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_1649ecc1a5870555+0x29/0x39
bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline]
__bpf_prog_run include/linux/filter.h:616 [inline]
bpf_prog_run include/linux/filter.h:623 [inline]
bpf_overflow_handler+0x1fc/0x510 kernel/events/core.c:10584
__perf_event_overflow+0x447/0x630 kernel/events/core.c:9720
perf_event_overflow kernel/events/core.c:9741 [inline]
perf_swevent_hrtimer+0x439/0x610 kernel/events/core.c:11230
__run_hrtimer kernel/time/hrtimer.c:1750 [inline]
__hrtimer_run_queues+0x4e1/0xc40 kernel/time/hrtimer.c:1814
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
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+0x26a/0x8f0 kernel/sched/core.c:5255
Code: 0f 84 33 01 00 00 48 85 db 0f 85 52 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 b0 63 32 09 e8 9b 29 30 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc9000f0177d8 EFLAGS: 00000286
RAX: 6de5d68a2cd49100 RBX: 0000000000000000 RCX: 6de5d68a2cd49100
RDX: dffffc0000000000 RSI: ffffffff8acac9e0 RDI: ffffffff8b1c8de0
RBP: ffffc9000f017830 R08: ffffffff8e8b0c2f R09: 1ffffffff1d16185
R10: dffffc0000000000 R11: fffffbfff1d16186 R12: ffff88803c2ada00
R13: dffffc0000000000 R14: ffff88803c2abc00 R15: ffff8880b8f3cac8
context_switch kernel/sched/core.c:5384 [inline]
__schedule+0x155b/0x45a0 kernel/sched/core.c:6700
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867
preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891
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+0x781/0x1190 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+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3ea939c819
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:00007f3eaa2c70e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f3ea9616098 RCX: 00007f3ea939c819
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f3ea961609c
RBP: 00007f3ea9616090 R08: 0000000000745d1e R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3ea9616128 R14: 00007ffd8ecc6700 R15: 00007ffd8ecc67e8
Allocated by task 26266:
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+0xb4/0x230 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+0x33a/0x4c0 kernel/bpf/stackmap.c:114
map_create+0x877/0x12f0 kernel/bpf/syscall.c:1247
__sys_bpf+0x651/0x890 kernel/bpf/syscall.c:5459
__do_sys_bpf kernel/bpf/syscall.c:5581 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5579 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5579
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 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+0x153/0x950 kernel/rcu/tree.c:2837
nf_hook_entries_free net/netfilter/core.c:88 [inline]
__nf_register_net_hook+0x788/0x910 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
ebt_register_table+0xcec/0x10b0 net/bridge/netfilter/ebtables.c:1274
find_inlist_lock_noload+0x178/0x260 net/bridge/netfilter/ebtables.c:343
find_inlist_lock net/bridge/netfilter/ebtables.c:370 [inline]
find_table_lock net/bridge/netfilter/ebtables.c:379 [inline]
do_ebt_get_ctl+0x2d6/0x1d80 net/bridge/netfilter/ebtables.c:2468
nf_getsockopt+0x262/0x280 net/netfilter/nf_sockopt.c:116
ip_getsockopt+0x19f/0x230 net/ipv4/ip_sockglue.c:1790
do_sock_getsockopt+0x379/0x450 net/socket.c:2383
__sys_getsockopt net/socket.c:2412 [inline]
__do_sys_getsockopt net/socket.c:2422 [inline]
__se_sys_getsockopt net/socket.c:2419 [inline]
__x64_sys_getsockopt+0x1d6/0x280 net/socket.c:2419
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
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+0x153/0x950 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_ct_netns_do_put net/netfilter/nf_conntrack_proto.c:535 [inline]
nf_ct_netns_put+0x2d2/0x520 net/netfilter/nf_conntrack_proto.c:616
nf_conncount_destroy+0x41/0x150 net/netfilter/nf_conncount.c:688
ovs_ct_limit_exit net/openvswitch/conntrack.c:1597 [inline]
ovs_ct_exit+0x9c/0x200 net/openvswitch/conntrack.c:2000
ovs_exit_net+0xed/0x7a0 net/openvswitch/datapath.c:2686
ops_exit_list net/core/net_namespace.c:173 [inline]
cleanup_net+0x70a/0xbb0 net/core/net_namespace.c:652
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
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
The buggy address belongs to the object at ffff88805e1e1480
which belongs to the cache kmalloc-cg-64 of size 64
The buggy address is located 16 bytes inside of
allocated 40-byte region [ffff88805e1e1480, ffff88805e1e14a8)
The buggy address belongs to the physical page:
page:ffffea0001787840 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5e1e1
memcg:ffff88802edfc201
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888017c4da00 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080200020 00000001ffffffff ffff88802edfc201
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 5773, tgid 5773 (syz-executor), ts 86927169462, free_ts 32022791676
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
prep_new_page mm/page_alloc.c:1588 [inline]
get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500
alloc_slab_page+0x5d/0x160 mm/slub.c:1881
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5d/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+0x19e/0x250 mm/slub.c:3534
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc_node+0xa4/0x230 mm/slab_common.c:1014
kmalloc_node include/linux/slab.h:620 [inline]
kvmalloc_node+0x70/0x180 mm/util.c:617
kvmalloc include/linux/slab.h:738 [inline]
kvzalloc include/linux/slab.h:746 [inline]
allocate_hook_entries_size net/netfilter/core.c:61 [inline]
nf_hook_entries_grow+0x27d/0x6d0 net/netfilter/core.c:140
__nf_register_net_hook+0x2c9/0x910 net/netfilter/core.c:435
nf_register_net_hook+0xb2/0x190 net/netfilter/core.c:578
nf_register_net_hooks+0x44/0x1b0 net/netfilter/core.c:594
brnf_device_event+0x132/0x1d0 net/bridge/br_netfilter_hooks.c:1125
notifier_call_chain+0x197/0x380 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2077 [inline]
call_netdevice_notifiers net/core/dev.c:2091 [inline]
register_netdevice+0x16a5/0x1bb0 net/core/dev.c:10339
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1181 [inline]
free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
free_contig_range+0xa1/0x150 mm/page_alloc.c:6420
destroy_args+0x80/0x850 mm/debug_vm_pgtable.c:1015
debug_vm_pgtable+0x411/0x440 mm/debug_vm_pgtable.c:1400
do_one_initcall+0x242/0x790 init/main.c:1250
do_initcall_level+0x137/0x1f0 init/main.c:1312
do_initcalls+0x69/0xd0 init/main.c:1328
kernel_init_freeable+0x3ed/0x580 init/main.c:1565
kernel_init+0x1d/0x1c0 init/main.c:1455
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:
ffff88805e1e1380: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88805e1e1400: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
>ffff88805e1e1480: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff88805e1e1500: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
ffff88805e1e1580: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 0f 84 33 01 00 00 je 0x139
6: 48 85 db test %rbx,%rbx
9: 0f 85 52 01 00 00 jne 0x161
f: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
14: 4c 8b 75 d0 mov -0x30(%rbp),%r14
18: 4c 89 e7 mov %r12,%rdi
1b: e8 b0 63 32 09 call 0x93263d0
20: e8 9b 29 30 00 call 0x3029c0
25: fb sti
26: 4c 8b 65 c0 mov -0x40(%rbp),%r12
* 2a: 49 8d bc 24 f8 15 00 lea 0x15f8(%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 28 movzbl (%rax,%r13,1),%eax
3e: 84 c0 test %al,%al