==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 32 at addr ffff888118bcbbd0 by task syz.9.16563/23279

CPU: 0 PID: 23279 Comm: syz.9.16563 Tainted: G        W          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_52ee0099233a1ca4+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+0x3c7/0x5e0 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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:syscall_exit_to_user_mode_prepare+0x0/0x20 kernel/entry/common.c:267
Code: ef 2f 06 48 85 c0 74 0f 48 89 f2 48 89 fe 48 8b 78 08 e8 23 f6 ff ff 65 ff 0d 44 64 a2 7e 75 c0 e8 31 73 a0 ff 5d c3 0f 1f 00 <65> 48 8b 05 28 64 a2 7e 48 8b 70 08 40 f6 c6 76 75 01 c3 55 48 89
RSP: 0018:ffffc90001c17f00 EFLAGS: 00000282
RAX: 0000000000000000 RBX: ffffc90001c17f58 RCX: 0000000000080000
RDX: ffffc9000d2c5000 RSI: 0000000000000030 RDI: ffffc90001c17f58
RBP: ffffc90001c17f10 R08: ffff88814a71c33f R09: 1ffff110294e3867
R10: dffffc0000000000 R11: ffffed10294e3868 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90001c17f58 R15: 0000000000000010
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3b5479ce59
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:00007f3b5561f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f3b54a15fa0 RCX: 00007f3b5479ce59
RDX: 0000000000000005 RSI: 0000000040042408 RDI: 0000000000000006
RBP: 00007f3b54832e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3b54a16038 R14: 00007f3b54a15fa0 R15: 00007ffe1d8f71d8
 </TASK>

Allocated by task 23279:
 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
 __call_rcu_common kernel/rcu/tree.c:2807 [inline]
 call_rcu+0xcf/0xf50 kernel/rcu/tree.c:2926
 gro_cells_destroy+0x383/0x3f0 net/core/gro_cells.c:128
 ip_tunnel_dev_free+0x19/0x60 net/ipv4/ip_tunnel.c:1026
 netdev_run_todo+0xa94/0xc30 net/core/dev.c:10512
 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:147
 ip_tunnel_delete_nets+0x34b/0x390 net/ipv4/ip_tunnel.c:1140
 ipgre_tap_exit_batch_net+0x22/0x30 net/ipv4/ip_gre.c:1712
 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 ffff888118bcbbc0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff888118bcbbc0, ffff888118bcbbe0)

The buggy address belongs to the physical page:
page:ffffea000462f2c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x118bcb
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100042600
raw: 0000000000000000 0000000080400040 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 410, tgid 409 (syz.2.33), ts 29805895430, free_ts 29798345784
 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]
 kzalloc include/linux/slab.h:699 [inline]
 ref_tracker_alloc+0x16b/0x4a0 lib/ref_tracker.c:85
 __netdev_tracker_alloc include/linux/netdevice.h:4085 [inline]
 netdev_hold include/linux/netdevice.h:4114 [inline]
 qdisc_alloc+0x561/0x750 net/sched/sch_generic.c:987
 qdisc_create_dflt+0x6b/0x3a0 net/sched/sch_generic.c:1009
 mq_init+0x2c3/0x660 net/sched/sch_mq.c:90
 qdisc_create_dflt+0x150/0x3a0 net/sched/sch_generic.c:1016
 attach_default_qdiscs net/sched/sch_generic.c:1195 [inline]
 dev_activate+0x152/0x1110 net/sched/sch_generic.c:1249
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+0x80c/0x820 mm/page_alloc.c:3621
 free_unref_page+0x93/0x530 mm/page_alloc.c:3719
 free_the_page mm/page_alloc.c:863 [inline]
 __free_pages+0x67/0x100 mm/page_alloc.c:6020
 __vunmap+0xa3c/0xc00 mm/vmalloc.c:2739
 free_work+0x5a/0x80 mm/vmalloc.c:98
 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

Memory state around the buggy address:
 ffff888118bcba80: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff888118bcbb00: fb fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
>ffff888118bcbb80: 00 00 00 00 fc fc fc fc 00 00 00 fc fc fc fc fc
                                                    ^
 ffff888118bcbc00: 00 00 00 00 fc fc fc fc 00 00 04 fc fc fc fc fc
 ffff888118bcbc80: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
==================================================================
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	48 85 c0             	test   %rax,%rax
   3:	74 0f                	je     0x14
   5:	48 89 f2             	mov    %rsi,%rdx
   8:	48 89 fe             	mov    %rdi,%rsi
   b:	48 8b 78 08          	mov    0x8(%rax),%rdi
   f:	e8 23 f6 ff ff       	call   0xfffff637
  14:	65 ff 0d 44 64 a2 7e 	decl   %gs:0x7ea26444(%rip)        # 0x7ea2645f
  1b:	75 c0                	jne    0xffffffdd
  1d:	e8 31 73 a0 ff       	call   0xffa07353
  22:	5d                   	pop    %rbp
  23:	c3                   	ret
  24:	0f 1f 00             	nopl   (%rax)
* 27:	65 48 8b 05 28 64 a2 	mov    %gs:0x7ea26428(%rip),%rax        # 0x7ea26457 <-- trapping instruction
  2e:	7e
  2f:	48 8b 70 08          	mov    0x8(%rax),%rsi
  33:	40 f6 c6 76          	test   $0x76,%sil
  37:	75 01                	jne    0x3a
  39:	c3                   	ret
  3a:	55                   	push   %rbp
  3b:	48                   	rex.W
  3c:	89                   	.byte 0x89