==================================================================
BUG: KASAN: slab-out-of-bounds in stack_map_get_build_id_offset+0x833/0x9b0 kernel/bpf/stackmap.c:147
Write of size 4 at addr ffff888131cdc110 by task syz.1.838/4105
CPU: 0 PID: 4105 Comm: syz.1.838 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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
__asan_report_store4_noabort+0x17/0x20 mm/kasan/report_generic.c:355
stack_map_get_build_id_offset+0x833/0x9b0 kernel/bpf/stackmap.c:147
__bpf_get_stackid+0x5ac/0x960 kernel/bpf/stackmap.c:250
____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline]
bpf_get_stackid_pe+0x2ee/0x400 kernel/bpf/stackmap.c:334
bpf_prog_43b50326510579ba+0x21/0x36
bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
__bpf_prog_run include/linux/filter.h:596 [inline]
bpf_prog_run include/linux/filter.h:614 [inline]
bpf_overflow_handler+0x521/0x5e0 kernel/events/core.c:10273
__perf_event_overflow+0x458/0x640 kernel/events/core.c:9448
perf_event_overflow kernel/events/core.c:9469 [inline]
perf_swevent_hrtimer+0x4b4/0x540 kernel/events/core.c:10919
__run_hrtimer kernel/time/hrtimer.c:1689 [inline]
__hrtimer_run_queues+0x398/0x8a0 kernel/time/hrtimer.c:1753
hrtimer_interrupt+0x3ad/0x8c0 kernel/time/hrtimer.c:1815
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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x55/0x80 kernel/locking/spinlock.c:194
Code: c0 db 0d 87 e8 dc 22 b5 fc 4c 89 f7 48 83 3d 31 09 0c 02 00 74 30 e8 9e 0d 00 00 90 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 96 c2 4a fc 65 8b 05 17 9b 00 7b 85 c0 74 05 5b 41 5e 5d c3 e8
RSP: 0018:ffffc9000dc7faa0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000a02 RCX: dffffc0000000000
RDX: ffffc900016ea000 RSI: 0000000000000a02 RDI: 0000000000000001
RBP: ffffc9000dc7fab0 R08: ffffffff8792f92f R09: 1ffffffff0f25f25
R10: dffffc0000000000 R11: fffffbfff0f25f26 R12: ffff88811e476e44
R13: 0000000000000000 R14: ffff8881f6e37f00 R15: 1ffff11023c8ecae
try_to_wake_up+0x5e4/0x1250 kernel/sched/core.c:4394
wake_up_process kernel/sched/core.c:4528 [inline]
wake_up_q+0xd8/0x1a0 kernel/sched/core.c:1032
futex_wake+0x5e9/0x8e0 kernel/futex/waitwake.c:188
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: 0033:0x7fafccb9e159
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:00007fafcdae60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fafcce25fa8 RCX: 00007fafccb9e159
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fafcce25fac
RBP: 00007fafcce25fa0 R08: 0032c031bcaba4c4 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fafcce26038 R14: 00007fffcd92f090 R15: 00007fffcd92f178
Allocated by task 4105:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
kasan_save_alloc_info+0x1f/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+0x398/0x520 kernel/bpf/stackmap.c:117
find_and_alloc_map kernel/bpf/syscall.c:133 [inline]
map_create+0x467/0xcf0 kernel/bpf/syscall.c:1126
__sys_bpf+0x34e/0x850 kernel/bpf/syscall.c:4988
__do_sys_bpf kernel/bpf/syscall.c:5110 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5108 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5108
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
Last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46
__kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486
kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
kvfree_call_rcu+0x8b/0x7a0 kernel/rcu/tree.c:3445
drop_sysctl_table+0x2f5/0x430 fs/proc/proc_sysctl.c:1731
unregister_sysctl_table+0x75/0x120 fs/proc/proc_sysctl.c:1769
unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175
netfilter_log_sysctl_exit net/netfilter/nf_log.c:514 [inline]
nf_log_net_exit+0x60/0xc0 net/netfilter/nf_log.c:555
ops_exit_list net/core/net_namespace.c:172 [inline]
cleanup_net+0x5b0/0xb10 net/core/net_namespace.c:604
process_one_work+0x717/0xc30 kernel/workqueue.c:2302
worker_thread+0xa4d/0x11d0 kernel/workqueue.c:2449
kthread+0x281/0x320 kernel/kthread.c:386
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Second to last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46
__kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486
kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
__call_rcu_common kernel/rcu/tree.c:2807 [inline]
call_rcu+0xcf/0xf50 kernel/rcu/tree.c:2926
inetdev_destroy net/ipv4/devinet.c:333 [inline]
inetdev_event+0x87f/0x10a0 net/ipv4/devinet.c:1615
notifier_call_chain kernel/notifier.c:87 [inline]
raw_notifier_call_chain+0xa1/0x110 kernel/notifier.c:455
call_netdevice_notifiers_info net/core/dev.c:2022 [inline]
call_netdevice_notifiers_extack net/core/dev.c:2060 [inline]
call_netdevice_notifiers net/core/dev.c:2074 [inline]
unregister_netdevice_many+0x104a/0x1910 net/core/dev.c:11005
ip_tunnel_delete_nets+0x346/0x390 net/ipv4/ip_tunnel.c:1139
erspan_exit_batch_net+0x22/0x30 net/ipv4/ip_gre.c:1730
ops_exit_list net/core/net_namespace.c:177 [inline]
cleanup_net+0x630/0xb10 net/core/net_namespace.c:604
process_one_work+0x717/0xc30 kernel/workqueue.c:2302
worker_thread+0xa4d/0x11d0 kernel/workqueue.c:2449
kthread+0x281/0x320 kernel/kthread.c:386
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
The buggy address belongs to the object at ffff888131cdc000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 272 bytes inside of
512-byte region [ffff888131cdc000, ffff888131cdc200)
The buggy address belongs to the physical page:
page:ffffea0004c73700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x131cdc
head:ffffea0004c73700 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042f00
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 290, tgid 290 (syz-executor), ts 24504838817, free_ts 0
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2673
prep_new_page+0x1c/0x110 mm/page_alloc.c:2680
get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4587
__alloc_pages+0x1fa/0x610 mm/page_alloc.c:5931
alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
allocate_slab mm/slub.c:1967 [inline]
new_slab+0x98/0x3e0 mm/slub.c:2020
___slab_alloc+0x70f/0xb70 mm/slub.c:3177
__slab_alloc+0x5e/0xa0 mm/slub.c:3263
slab_alloc_node mm/slub.c:3348 [inline]
__kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423
__do_kmalloc_node mm/slab_common.c:937 [inline]
__kmalloc_node_track_caller+0xa1/0x1e0 mm/slab_common.c:958
kmalloc_reserve net/core/skbuff.c:449 [inline]
__alloc_skb+0x226/0x4a0 net/core/skbuff.c:518
alloc_skb include/linux/skbuff.h:1322 [inline]
nlmsg_new include/net/netlink.h:987 [inline]
rtmsg_ifa+0xfa/0x1e0 net/ipv4/devinet.c:1933
__inet_insert_ifa+0x83f/0xa30 net/ipv4/devinet.c:567
inet_rtm_newaddr+0x8be/0x1650 net/ipv4/devinet.c:970
rtnetlink_rcv_msg+0xb28/0xde0 net/core/rtnetlink.c:6154
netlink_rcv_skb+0x200/0x450 net/netlink/af_netlink.c:2526
page_owner free stack trace missing
Memory state around the buggy address:
ffff888131cdc000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888131cdc080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888131cdc100: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff888131cdc180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888131cdc200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: c0 db 0d rcr $0xd,%bl
3: 87 e8 xchg %ebp,%eax
5: dc 22 fsubl (%rdx)
7: b5 fc mov $0xfc,%ch
9: 4c 89 f7 mov %r14,%rdi
c: 48 83 3d 31 09 0c 02 cmpq $0x0,0x20c0931(%rip) # 0x20c0945
13: 00
14: 74 30 je 0x46
16: e8 9e 0d 00 00 call 0xdb9
1b: 90 nop
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 96 c2 4a fc call 0xfc4ac2c5 <-- trapping instruction
2f: 65 8b 05 17 9b 00 7b mov %gs:0x7b009b17(%rip),%eax # 0x7b009b4d
36: 85 c0 test %eax,%eax
38: 74 05 je 0x3f
3a: 5b pop %rbx
3b: 41 5e pop %r14
3d: 5d pop %rbp
3e: c3 ret
3f: e8 .byte 0xe8