==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 32 at addr ffff888114703790 by task syz.1.558/2376

CPU: 1 PID: 2376 Comm: syz.1.558 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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_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+0x51f/0x5e0 kernel/events/core.c:10273
 __perf_event_overflow+0x437/0x620 kernel/events/core.c:9448
 perf_event_overflow kernel/events/core.c:9469 [inline]
 perf_swevent_hrtimer+0x400/0x5b0 kernel/events/core.c:10919
 __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:mutex_unlock+0x1/0x230 kernel/locking/mutex.c:558
Code: ff ff ff 66 0f 1f 44 00 00 55 48 89 e5 be 02 00 00 00 e8 c2 12 00 00 5d c3 90 90 90 90 90 90 90 90 90 90 90 b8 c9 ff ad 1b 55 <48> 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 83 ec 60 49 89
RSP: 0018:ffffc90000e97bd0 EFLAGS: 00000282
RAX: ffffffff819a13df RBX: ffff888110367400 RCX: 0000000000080000
RDX: ffffc900016ca000 RSI: 000000000000002b RDI: ffff888110367410
RBP: ffffc90000e97e80 R08: ffff88811e8c383f R09: 1ffff11023d18707
R10: dffffc0000000000 R11: ffffed1023d18708 R12: 0000000040042408
R13: dffffc0000000000 R14: fffff520001d2f8c R15: 0000000000000000
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
 x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
 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: 0033:0x7fe85339cdd9
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:00007fe851df7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe853615fa0 RCX: 00007fe85339cdd9
RDX: 0000000000000006 RSI: 0000000040042408 RDI: 0000000000000007
RBP: 00007fe853432d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe853616038 R14: 00007fe853615fa0 R15: 00007ffde0f27568
 </TASK>

Allocated by task 2376:
 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: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

The buggy address belongs to the object at ffff888114703780
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
 64-byte region [ffff888114703780, ffff8881147037c0)

The buggy address belongs to the physical page:
page:ffffea000451c0c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x114703
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004c925c0 dead000000000004 ffff888100042780
raw: 0000000000000000 0000000000200020 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 702, tgid 702 (syz-executor), ts 36770495947, free_ts 36749622145
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2679
 get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4585
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5926
 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:1134
 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:1580 [inline]
 free_pcp_prepare mm/page_alloc.c:1654 [inline]
 free_unref_page_prepare+0x7f8/0x800 mm/page_alloc.c:3620
 free_unref_page+0x95/0x540 mm/page_alloc.c:3718
 free_the_page mm/page_alloc.c:863 [inline]
 __free_pages+0x67/0x100 mm/page_alloc.c:6016
 free_pages+0x82/0x90 mm/page_alloc.c:6027
 tlb_batch_list_free mm/mmu_gather.c:75 [inline]
 tlb_finish_mmu+0x2c7/0x370 mm/mmu_gather.c:364
 exit_mmap+0x412/0xc10 mm/mmap.c:3384
 __mmput+0x93/0x360 kernel/fork.c:1319
 mmput+0x4b/0x150 kernel/fork.c:1343
 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:
 ffff888114703680: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888114703700: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888114703780: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff888114703800: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888114703880: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	66 0f 1f 44 00 00    	nopw   0x0(%rax,%rax,1)
   6:	55                   	push   %rbp
   7:	48 89 e5             	mov    %rsp,%rbp
   a:	be 02 00 00 00       	mov    $0x2,%esi
   f:	e8 c2 12 00 00       	call   0x12d6
  14:	5d                   	pop    %rbp
  15:	c3                   	ret
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	90                   	nop
  20:	90                   	nop
  21:	b8 c9 ff ad 1b       	mov    $0x1badffc9,%eax
  26:	55                   	push   %rbp
* 27:	48 89 e5             	mov    %rsp,%rbp <-- trapping instruction
  2a:	41 57                	push   %r15
  2c:	41 56                	push   %r14
  2e:	41 55                	push   %r13
  30:	41 54                	push   %r12
  32:	53                   	push   %rbx
  33:	48 83 e4 e0          	and    $0xffffffffffffffe0,%rsp
  37:	48 83 ec 60          	sub    $0x60,%rsp
  3b:	49                   	rex.WB
  3c:	89                   	.byte 0x89