syzbot

==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 88 at addr ffff888132d3a190 by task syz.0.128/788

CPU: 0 PID: 788 Comm: syz.0.128 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_3150bcfa38b8be26+0x21/0x39
 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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:should_fail_ex+0x130/0x520 lib/fault-inject.c:106
Code: 42 0f b6 04 28 84 c0 0f 85 4d 03 00 00 49 63 04 24 49 39 c7 7d 74 4c 89 e7 be 04 00 00 00 e8 87 8b 2a ff f0 45 29 3c 24 eb 4b <65> 4c 8b 25 78 e2 75 7d 49 81 c4 0c 0b 00 00 4c 89 e3 48 c1 eb 03
RSP: 0018:ffffc900009a79f8 EFLAGS: 00000246
RAX: 0000000080000000 RBX: 0000000000000000 RCX: ffff888113a25100
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff871ce040
RBP: ffffc900009a7a40 R08: ffffc900009a7bf7 R09: ffffc900009a7be0
R10: dffffc0000000000 R11: fffff52000134f7f R12: 1ffff92000134f58
R13: dffffc0000000000 R14: ffffffff871ce040 R15: 0000000000000001
 should_fail+0xb/0x10 lib/fault-inject.c:157
 should_fail_futex kernel/futex/core.c:83 [inline]
 get_futex_key+0x143/0xb10 kernel/futex/core.c:241
 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: 0033:0x7f7b30b9ce59
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:00007f7b319c20e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f7b30e15fa8 RCX: 00007f7b30b9ce59
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f7b30e15fac
RBP: 00007f7b30e15fa0 R08: 000f962f547da364 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7b30e16038 R14: 00007ffcb1005a90 R15: 00007ffcb1005b78
 </TASK>

Allocated by task 788:
 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 ffff888132d3a180
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
 64-byte region [ffff888132d3a180, ffff888132d3a1c0)

The buggy address belongs to the physical page:
page:ffffea0004cb4e80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x132d3a
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004c53700 dead000000000002 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 333, tgid 332 (syz.1.10), ts 27911271299, free_ts 27885167198
 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
 kmalloc_trace+0x29/0xb0 mm/slab_common.c:1028
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 snmp6_alloc_dev net/ipv6/addrconf.c:354 [inline]
 ipv6_add_dev+0x5b0/0x1230 net/ipv6/addrconf.c:408
 addrconf_notify+0x6d5/0xe40 net/ipv6/addrconf.c:3621
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xa1/0x110 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:2022 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2060 [inline]
 call_netdevice_notifiers+0x119/0x190 net/core/dev.c:2074
 register_netdevice+0x1173/0x1530 net/core/dev.c:10227
 register_netdev+0x3e/0x50 net/core/dev.c:10320
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
 _pgd_free arch/x86/mm/pgtable.c:420 [inline]
 pgd_free+0x187/0x1a0 arch/x86/mm/pgtable.c:476
 mm_free_pgd kernel/fork.c:834 [inline]
 __mmdrop+0xad/0x600 kernel/fork.c:885
 mmdrop include/linux/sched/mm.h:50 [inline]
 __mmput+0x351/0x360 kernel/fork.c:1331
 mmput+0x4b/0x150 kernel/fork.c:1343
 copy_process+0x2610/0x3510 kernel/fork.c:2752
 kernel_clone+0x22f/0x820 kernel/fork.c:2900
 __do_sys_clone kernel/fork.c:3043 [inline]
 __se_sys_clone kernel/fork.c:3027 [inline]
 __x64_sys_clone+0x193/0x200 kernel/fork.c:3027
 x64_sys_call+0x990/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:57
 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:
 ffff888132d3a080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888132d3a100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888132d3a180: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff888132d3a200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888132d3a280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
   0:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax
   5:	84 c0                	test   %al,%al
   7:	0f 85 4d 03 00 00    	jne    0x35a
   d:	49 63 04 24          	movslq (%r12),%rax
  11:	49 39 c7             	cmp    %rax,%r15
  14:	7d 74                	jge    0x8a
  16:	4c 89 e7             	mov    %r12,%rdi
  19:	be 04 00 00 00       	mov    $0x4,%esi
  1e:	e8 87 8b 2a ff       	call   0xff2a8baa
  23:	f0 45 29 3c 24       	lock sub %r15d,(%r12)
  28:	eb 4b                	jmp    0x75
* 2a:	65 4c 8b 25 78 e2 75 	mov    %gs:0x7d75e278(%rip),%r12        # 0x7d75e2aa <-- trapping instruction
  31:	7d
  32:	49 81 c4 0c 0b 00 00 	add    $0xb0c,%r12
  39:	4c 89 e3             	mov    %r12,%rbx
  3c:	48 c1 eb 03          	shr    $0x3,%rbx