==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 32 at addr ffff888131a03490 by task syz.1.827/3284

CPU: 0 PID: 3284 Comm: syz.1.827 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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+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:1685 [inline]
 __hrtimer_run_queues+0x398/0x890 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3ad/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:perf_ioctl+0x1493/0x1e70 kernel/events/core.c:-1
Code: ff 49 c7 c7 f7 ff ff ff eb 20 e8 48 66 d7 ff e8 d3 e5 c3 ff 49 c7 c7 ea ff ff ff eb 08 e8 35 66 d7 ff 45 31 ff 4c 8b 74 24 18 <48> 8b 5c 24 78 48 89 df 48 83 c7 10 e8 0c b3 65 03 48 89 df e8 24
RSP: 0018:ffffc9000eb3fbe0 EFLAGS: 00000246
RAX: ffffffff8199ef7d RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000162a000 RSI: 000000000000002b RDI: 000000000000002c
RBP: ffffc9000eb3fe80 R08: ffff8881138fe03f R09: 1ffff1102271fc07
R10: dffffc0000000000 R11: ffffed102271fc08 R12: 0000000040042408
R13: dffffc0000000000 R14: fffff52001d67f8c 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: 0033:0x7f469519ce59
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:00007f4695fbb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4695415fa0 RCX: 00007f469519ce59
RDX: 0000000000000005 RSI: 0000000040042408 RDI: 0000000000000006
RBP: 00007f4695232d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4695416038 R14: 00007f4695415fa0 R15: 00007ffc6bb85cf8
 </TASK>

Allocated by task 3284:
 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
 fib_notifier_ops_unregister+0xe7/0x100 net/core/fib_notifier.c:167
 fib4_notifier_exit+0x3b/0x40 net/ipv4/fib_notifier.c:71
 ip_fib_net_exit+0x35b/0x3a0 net/ipv4/fib_frontend.c:1611
 fib_net_exit_batch+0x47/0x90 net/ipv4/fib_frontend.c:1654
 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 ffff888131a03480
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
 64-byte region [ffff888131a03480, ffff888131a034c0)

The buggy address belongs to the physical page:
page:ffffea0004c680c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x131a03
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004852a40 dead000000000005 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 288, tgid 288 (syz-executor), ts 25322246725, free_ts 0
 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+0x2ca9/0x2d20 mm/page_alloc.c:4586
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930
 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
 kmalloc_trace+0x29/0xb0 mm/slab_common.c:1028
 kmalloc include/linux/slab.h:563 [inline]
 call_modprobe kernel/kmod.c:79 [inline]
 __request_module+0x2a7/0x910 kernel/kmod.c:170
 dev_load+0x5b/0xb0 net/core/dev_ioctl.c:435
 dev_ioctl+0x3a2/0xcf0 net/core/dev_ioctl.c:500
 sock_do_ioctl+0x252/0x330 net/socket.c:1205
 sock_ioctl+0x475/0x700 net/socket.c:1310
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888131a03380: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888131a03400: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff888131a03480: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff888131a03500: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888131a03580: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	49 c7 c7 f7 ff ff ff 	mov    $0xfffffffffffffff7,%r15
   7:	eb 20                	jmp    0x29
   9:	e8 48 66 d7 ff       	call   0xffd76656
   e:	e8 d3 e5 c3 ff       	call   0xffc3e5e6
  13:	49 c7 c7 ea ff ff ff 	mov    $0xffffffffffffffea,%r15
  1a:	eb 08                	jmp    0x24
  1c:	e8 35 66 d7 ff       	call   0xffd76656
  21:	45 31 ff             	xor    %r15d,%r15d
  24:	4c 8b 74 24 18       	mov    0x18(%rsp),%r14
* 29:	48 8b 5c 24 78       	mov    0x78(%rsp),%rbx <-- trapping instruction
  2e:	48 89 df             	mov    %rbx,%rdi
  31:	48 83 c7 10          	add    $0x10,%rdi
  35:	e8 0c b3 65 03       	call   0x365b346
  3a:	48 89 df             	mov    %rbx,%rdi
  3d:	e8                   	.byte 0xe8
  3e:	24                   	.byte 0x24