syzbot

==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6c9/0x920 kernel/bpf/stackmap.c:274
Write of size 32 at addr ffff88807b5e9a90 by task syz.0.17/4431

CPU: 0 PID: 4431 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:420
 kasan_report+0x10b/0x140 mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x235/0x290 mm/kasan/generic.c:189
 memcpy+0x3c/0x60 mm/kasan/shadow.c:66
 __bpf_get_stackid+0x6c9/0x920 kernel/bpf/stackmap.c:274
 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline]
 bpf_get_stackid_pe+0x33f/0x400 kernel/bpf/stackmap.c:334
 bpf_prog_7018bb76bd3f7f7a+0x28/0x3d
 bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
 __bpf_prog_run include/linux/filter.h:607 [inline]
 bpf_prog_run include/linux/filter.h:614 [inline]
 bpf_overflow_handler+0x522/0x7c0 kernel/events/core.c:10321
 __perf_event_overflow+0x448/0x610 kernel/events/core.c:9496
 perf_event_overflow kernel/events/core.c:9517 [inline]
 perf_swevent_hrtimer+0x472/0x630 kernel/events/core.c:10967
 __run_hrtimer kernel/time/hrtimer.c:1747 [inline]
 __hrtimer_run_queues+0x50b/0xd50 kernel/time/hrtimer.c:1811
 hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1873
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:97 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2a/0x80 kernel/entry/common.c:118
Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 ed fa ff ff 66 90 66 90 e8 f4 f4 5a f7 e8 6f f3 5a f7 fb 65 48 8b 05 e6 72 d4 75 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 51 50 41 f7 48
RSP: 0018:ffffc90003417f08 EFLAGS: 00000286
RAX: ffff888079d9d940 RBX: 00000000000000ca RCX: 5c74ab96d0e71900
RDX: dffffc0000000000 RSI: ffffffff8a8c19a0 RDI: ffffffff8adf1ba0
RBP: ffffc90003417f48 R08: ffffffff8e1ffbef R09: 1ffffffff1c3ff7d
R10: dffffc0000000000 R11: fffffbfff1c3ff7e R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90003417f58 R15: 0000000000000000
 do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:72
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f749c19ce59
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:00007ffefd5673a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f749c19ce59
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f749c415fac
RBP: 00000000000008a7 R08: 0032c7765a7029e4 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f749c415fac R14: 00007f749c415fa8 R15: 00007f749c415fa0
 </TASK>

Allocated by task 4431:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:936 [inline]
 __kmalloc_node+0xb0/0x240 mm/slab_common.c:943
 kmalloc_node include/linux/slab.h:589 [inline]
 __bpf_map_area_alloc kernel/bpf/syscall.c:328 [inline]
 bpf_map_area_alloc+0x47/0xe0 kernel/bpf/syscall.c:341
 prealloc_elems_and_freelist+0x86/0x1c0 kernel/bpf/stackmap.c:51
 stack_map_alloc+0x390/0x520 kernel/bpf/stackmap.c:117
 find_and_alloc_map kernel/bpf/syscall.c:133 [inline]
 map_create+0x534/0x1000 kernel/bpf/syscall.c:1149
 __sys_bpf+0x38b/0x780 kernel/bpf/syscall.c:5013
 __do_sys_bpf kernel/bpf/syscall.c:5135 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5133 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5133
 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 ffff88807b5e9a80
 which belongs to the cache kmalloc-cg-64 of size 64
The buggy address is located 16 bytes inside of
 64-byte region [ffff88807b5e9a80, ffff88807b5e9ac0)

The buggy address belongs to the physical page:
page:ffffea0001ed7a40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b5e9
memcg:ffff88802f8f3201
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 0000000000000000 dead000000000122 ffff888017442780
raw: 0000000000000000 0000000080200020 00000001ffffffff ffff88802f8f3201
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 46, tgid 46 (kworker/u4:3), ts 90274242543, free_ts 90203812036
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2559
 prep_new_page mm/page_alloc.c:2566 [inline]
 get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357
 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5657
 alloc_slab_page+0x5d/0x160 mm/slub.c:1799
 allocate_slab mm/slub.c:1944 [inline]
 new_slab+0x87/0x2c0 mm/slub.c:1997
 ___slab_alloc+0xbc6/0x1240 mm/slub.c:3154
 __slab_alloc mm/slub.c:3240 [inline]
 slab_alloc_node mm/slub.c:3325 [inline]
 __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3398
 __do_kmalloc_node mm/slab_common.c:935 [inline]
 __kmalloc_node+0xa0/0x240 mm/slab_common.c:943
 kmalloc_node include/linux/slab.h:589 [inline]
 kvmalloc_node+0x6c/0x180 mm/util.c:581
 kvmalloc include/linux/slab.h:716 [inline]
 kvzalloc include/linux/slab.h:724 [inline]
 allocate_hook_entries_size net/netfilter/core.c:61 [inline]
 __nf_hook_entries_try_shrink+0x310/0x6d0 net/netfilter/core.c:248
 __nf_unregister_net_hook+0x4e1/0x6e0 net/netfilter/core.c:508
 nf_unregister_net_hook net/netfilter/core.c:-1 [inline]
 nf_unregister_net_hooks+0xc7/0x130 net/netfilter/core.c:601
 nf_ct_netns_do_put net/netfilter/nf_conntrack_proto.c:568 [inline]
 nf_ct_netns_put+0x369/0x510 net/netfilter/nf_conntrack_proto.c:-1
 nf_conncount_destroy+0x3d/0x150 net/netfilter/nf_conncount.c:688
 ovs_ct_limit_exit net/openvswitch/conntrack.c:1919 [inline]
 ovs_ct_exit+0x98/0x200 net/openvswitch/conntrack.c:2322
 ovs_exit_net+0xe9/0x7a0 net/openvswitch/datapath.c:2655
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1486 [inline]
 free_pcp_prepare mm/page_alloc.c:1536 [inline]
 free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413
 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3508
 free_slab mm/slub.c:2036 [inline]
 discard_slab mm/slub.c:2042 [inline]
 __unfreeze_partials+0x1a5/0x200 mm/slub.c:2591
 put_cpu_partial+0x17c/0x250 mm/slub.c:2667
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 kmem_cache_alloc_node+0x14d/0x320 mm/slub.c:3404
 __alloc_skb+0xfc/0x7e0 net/core/skbuff.c:505
 alloc_skb include/linux/skbuff.h:1303 [inline]
 nlmsg_new include/net/netlink.h:998 [inline]
 inet_netconf_notify_devconf+0x16f/0x230 net/ipv4/devinet.c:2128
 __devinet_sysctl_unregister net/ipv4/devinet.c:2639 [inline]
 devinet_exit_net+0x1cf/0x220 net/ipv4/devinet.c:2780
 ops_exit_list net/core/net_namespace.c:172 [inline]
 cleanup_net+0x706/0xba0 net/core/net_namespace.c:640
 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376

Memory state around the buggy address:
 ffff88807b5e9980: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
 ffff88807b5e9a00: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
>ffff88807b5e9a80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff88807b5e9b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807b5e9b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
   0:	41 56                	push   %r14
   2:	53                   	push   %rbx
   3:	48 89 f3             	mov    %rsi,%rbx
   6:	49 89 fe             	mov    %rdi,%r14
   9:	48 8b 7c 24 10       	mov    0x10(%rsp),%rdi
   e:	e8 ed fa ff ff       	call   0xfffffb00
  13:	66 90                	xchg   %ax,%ax
  15:	66 90                	xchg   %ax,%ax
  17:	e8 f4 f4 5a f7       	call   0xf75af510
  1c:	e8 6f f3 5a f7       	call   0xf75af390
  21:	fb                   	sti
  22:	65 48 8b 05 e6 72 d4 	mov    %gs:0x75d472e6(%rip),%rax        # 0x75d47310
  29:	75
* 2a:	48 8b 70 08          	mov    0x8(%rax),%rsi <-- trapping instruction
  2e:	40 f6 c6 3f          	test   $0x3f,%sil
  32:	74 0b                	je     0x3f
  34:	4c 89 f7             	mov    %r14,%rdi
  37:	5b                   	pop    %rbx
  38:	41 5e                	pop    %r14
  3a:	e9 51 50 41 f7       	jmp    0xf7415090
  3f:	48                   	rex.W