==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 72 at addr ffff8881322da310 by task syz.1.258/1339

CPU: 1 PID: 1339 Comm: syz.1.258 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <IRQ>
 __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
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
 memcpy+0x44/0x70 mm/kasan/shadow.c:66
 __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline]
 bpf_get_stackid_pe+0x2ee/0x400 kernel/bpf/stackmap.c:334
 bpf_prog_16fa1569821187d5+0x21/0x31
 bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
 __bpf_prog_run include/linux/filter.h:607 [inline]
 bpf_prog_run include/linux/filter.h:614 [inline]
 bpf_overflow_handler+0x3d0/0x5e0 kernel/events/core.c:10238
 __perf_event_overflow+0x437/0x620 kernel/events/core.c:9448
 perf_swevent_hrtimer+0x400/0x5b0 kernel/events/core.c:10879
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x3bb/0x8e0 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3c7/0x8c0 kernel/time/hrtimer.c:1811
 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x60 kernel/kcov.c:209
Code: fb e8 23 00 00 00 48 8b 3d 1c 49 21 06 48 89 de e8 b4 83 44 00 5b 5d c3 00 90 90 90 90 90 90 90 90 90 90 90 b8 0c 67 40 a5 55 <48> 89 e5 48 8b 45 08 65 48 8b 0d d0 ff 90 7e 65 8b 15 d1 ff 90 7e
RSP: 0018:ffffc90000c8fa50 EFLAGS: 00000246
RAX: ffffffff81670f40 RBX: 0000000000000000 RCX: ffff8881195d0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff871ce040
RBP: ffffc90000c8fb50 R08: ffffc90000c8fbf7 R09: ffffc90000c8fbe0
R10: dffffc0000000000 R11: fffff52000191f7f R12: 1ffff92000191f58
R13: dffffc0000000000 R14: 000000000000009c R15: 00007fd0a7016000
 futex_wake+0x150/0x8e0 kernel/futex/waitwake.c:156
 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: 0033:0x7fd0a6d9c799
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:00007fd0a7ce20e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fd0a7016098 RCX: 00007fd0a6d9c799
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fd0a701609c
RBP: 00007fd0a7016090 R08: 003b6158f5a8f564 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd0a7016128 R14: 00007ffc15b2a300 R15: 00007ffc15b2a3e8
 </TASK>

Allocated by task 1336:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x25/0x30 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+0x3a7/0x530 kernel/bpf/stackmap.c:117
 find_and_alloc_map kernel/bpf/syscall.c:133 [inline]
 map_create+0x49c/0xd80 kernel/bpf/syscall.c:1126
 __sys_bpf+0x34e/0x850 kernel/bpf/syscall.c:4987
 __do_sys_bpf kernel/bpf/syscall.c:5109 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5107 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5107
 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

The buggy address belongs to the object at ffff8881322da300
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
 64-byte region [ffff8881322da300, ffff8881322da340)

The buggy address belongs to the physical page:
page:ffffea0004c8b680 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881322da000 pfn:0x1322da
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004c88808 ffffea0005210b08 ffff888100042780
raw: ffff8881322da000 000000000020001c 00000001ffffffff 0000000000000000
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 411, tgid 411 (syz-executor), ts 26386899871, free_ts 26374114190
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2670
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2677
 get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4583
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5924
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3d0 mm/slub.c:2020
 ___slab_alloc+0x6bd/0xb20 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 __kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3423
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc_node+0xa1/0x1e0 mm/slab_common.c:945
 kmalloc_node include/linux/slab.h:589 [inline]
 kvmalloc_node+0x28a/0x460 mm/util.c:592
 kvmalloc include/linux/slab.h:716 [inline]
 simple_xattr_alloc+0x43/0xa0 fs/xattr.c:1008
 shmem_initxattrs+0x8d/0x1e0 mm/shmem.c:3294
 security_inode_init_security+0x2a9/0x3d0 security/security.c:1133
 shmem_symlink+0xd0/0x4c0 mm/shmem.c:3166
 vfs_symlink+0x261/0x3f0 fs/namei.c:4478
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1578 [inline]
 free_pcp_prepare mm/page_alloc.c:1652 [inline]
 free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3618
 free_unref_page_list+0x117/0x8c0 mm/page_alloc.c:3769
 release_pages+0xaf2/0xb50 mm/swap.c:1048
 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:315
 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:254 [inline]
 tlb_flush_mmu mm/mmu_gather.c:261 [inline]
 tlb_finish_mmu+0x1aa/0x370 mm/mmu_gather.c:361
 exit_mmap+0x412/0xc10 mm/mmap.c:3384
 __mmput+0x93/0x360 kernel/fork.c:1312
 mmput+0x4b/0x150 kernel/fork.c:1336
 exit_mm kernel/exit.c:568 [inline]
 do_exit+0x994/0x2660 kernel/exit.c:873
 do_group_exit+0x210/0x2d0 kernel/exit.c:1028
 get_signal+0x13b5/0x1520 kernel/signal.c:2891
 arch_do_signal_or_restart+0xd1/0x1140 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82

Memory state around the buggy address:
 ffff8881322da200: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff8881322da280: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8881322da300: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff8881322da380: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8881322da400: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
   0:	fb                   	sti
   1:	e8 23 00 00 00       	call   0x29
   6:	48 8b 3d 1c 49 21 06 	mov    0x621491c(%rip),%rdi        # 0x6214929
   d:	48 89 de             	mov    %rbx,%rsi
  10:	e8 b4 83 44 00       	call   0x4483c9
  15:	5b                   	pop    %rbx
  16:	5d                   	pop    %rbp
  17:	c3                   	ret
  18:	00 90 90 90 90 90    	add    %dl,-0x6f6f6f70(%rax)
  1e:	90                   	nop
  1f:	90                   	nop
  20:	90                   	nop
  21:	90                   	nop
  22:	90                   	nop
  23:	90                   	nop
  24:	b8 0c 67 40 a5       	mov    $0xa540670c,%eax
  29:	55                   	push   %rbp
* 2a:	48 89 e5             	mov    %rsp,%rbp <-- trapping instruction
  2d:	48 8b 45 08          	mov    0x8(%rbp),%rax
  31:	65 48 8b 0d d0 ff 90 	mov    %gs:0x7e90ffd0(%rip),%rcx        # 0x7e910009
  38:	7e
  39:	65 8b 15 d1 ff 90 7e 	mov    %gs:0x7e90ffd1(%rip),%edx        # 0x7e910011