hrtimer: interrupt took 68151 ns
==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6c9/0x920 kernel/bpf/stackmap.c:274
Write of size 40 at addr ffff888076799a10 by task syz.0.17/5042

CPU: 0 PID: 5042 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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_fa73c8c086b491e8+0x21/0x31
 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:10286
 __perf_event_overflow+0x448/0x610 kernel/events/core.c:9496
 perf_swevent_hrtimer+0x3ef/0x590 kernel/events/core.c:10927
 __run_hrtimer kernel/time/hrtimer.c:1747 [inline]
 __hrtimer_run_queues+0x521/0xd70 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:perf_ioctl+0x2119/0x2420 kernel/events/core.c:-1
Code: 8d 08 45 31 ff 4c 8b 74 24 10 e9 c9 fe ff ff e8 ad 2b da ff 49 c7 c7 ea ff ff ff 4c 8b 74 24 10 41 c6 46 16 f8 41 c6 46 1a f8 <48> 8b 9c 24 98 00 00 00 48 89 df 48 83 c7 48 e8 b3 4a 8d 08 48 89
RSP: 0018:ffffc90003867c20 EFLAGS: 00010246
RAX: ffffffff81a836c4 RBX: 0000000000000000 RCX: ffff88802b8e1dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003867ed8 R08: ffff888078314077 R09: 1ffff1100f06280e
R10: dffffc0000000000 R11: ffffed100f06280f R12: 0000000040042408
R13: f8f8f8f8f8f8f8f8 R14: fffff5200070cf98 R15: 0000000000000000
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
 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: 0033:0x7f959479aeb9
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:00007f959573b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9594a15fa0 RCX: 00007f959479aeb9
RDX: 0000000000000004 RSI: 0000000040042408 RDI: 0000000000000005
RBP: 00007f9594808c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9594a16038 R14: 00007f9594a15fa0 R15: 00007fffdb84f548
 </TASK>

Allocated by task 5042:
 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:5012
 __do_sys_bpf kernel/bpf/syscall.c:5134 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5132 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5132
 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 ffff888076799a00
 which belongs to the cache kmalloc-cg-64 of size 64
The buggy address is located 16 bytes inside of
 64-byte region [ffff888076799a00, ffff888076799a40)

The buggy address belongs to the physical page:
page:ffffea0001d9e640 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76799
memcg:ffff888079fe1401
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 0000000000000000 dead000000000122 ffff888017442780
raw: 0000000000000000 0000000080200020 00000001ffffffff ffff888079fe1401
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 4826, tgid 4826 (syz-executor), ts 128664525944, free_ts 127217785913
 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:5643
 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_grow+0x309/0x730 net/netfilter/core.c:128
 __nf_register_net_hook+0x2c9/0x910 net/netfilter/core.c:423
 nf_register_net_hook+0xae/0x190 net/netfilter/core.c:566
 nf_register_net_hooks+0x40/0x1a0 net/netfilter/core.c:582
 nf_defrag_ipv6_enable+0x83/0x110 net/ipv6/netfilter/nf_defrag_ipv6_hooks.c:146
 nf_ct_netns_do_get+0x1e4/0x5b0 net/netfilter/nf_conntrack_proto.c:494
 nf_ct_netns_inet_get+0x3b/0x150 net/netfilter/nf_conntrack_proto.c:595
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_list+0xbb/0x8e0 mm/page_alloc.c:3554
 release_pages+0x1fa6/0x2220 mm/swap.c:1035
 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:254 [inline]
 tlb_flush_mmu+0x105/0x220 mm/mmu_gather.c:261
 tlb_finish_mmu+0xbd/0x1c0 mm/mmu_gather.c:361
 exit_mmap+0x384/0x960 mm/mmap.c:3262
 __mmput+0x118/0x3c0 kernel/fork.c:1205
 exec_mmap+0x4bc/0x580 fs/exec.c:1040
 begin_new_exec+0xaa4/0x1ee0 fs/exec.c:1299
 load_elf_binary+0x97c/0x2800 fs/binfmt_elf.c:1028
 search_binary_handler fs/exec.c:1764 [inline]
 exec_binprm fs/exec.c:1805 [inline]
 bprm_execve+0xaea/0x17e0 fs/exec.c:1874
 do_execveat_common+0x51b/0x6c0 fs/exec.c:1979
 do_execve fs/exec.c:2053 [inline]
 __do_sys_execve fs/exec.c:2129 [inline]
 __se_sys_execve fs/exec.c:2124 [inline]
 __x64_sys_execve+0x8e/0xa0 fs/exec.c:2124
 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

Memory state around the buggy address:
 ffff888076799900: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
 ffff888076799980: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
>ffff888076799a00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff888076799a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888076799b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
   0:	8d 08                	lea    (%rax),%ecx
   2:	45 31 ff             	xor    %r15d,%r15d
   5:	4c 8b 74 24 10       	mov    0x10(%rsp),%r14
   a:	e9 c9 fe ff ff       	jmp    0xfffffed8
   f:	e8 ad 2b da ff       	call   0xffda2bc1
  14:	49 c7 c7 ea ff ff ff 	mov    $0xffffffffffffffea,%r15
  1b:	4c 8b 74 24 10       	mov    0x10(%rsp),%r14
  20:	41 c6 46 16 f8       	movb   $0xf8,0x16(%r14)
  25:	41 c6 46 1a f8       	movb   $0xf8,0x1a(%r14)
* 2a:	48 8b 9c 24 98 00 00 	mov    0x98(%rsp),%rbx <-- trapping instruction
  31:	00
  32:	48 89 df             	mov    %rbx,%rdi
  35:	48 83 c7 48          	add    $0x48,%rdi
  39:	e8 b3 4a 8d 08       	call   0x88d4af1
  3e:	48                   	rex.W
  3f:	89                   	.byte 0x89