==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 32 at addr ffff8881512ab890 by task syz.0.2486/9263
CPU: 1 PID: 9263 Comm: syz.0.2486 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
__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_fa73c8c086b491e8+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
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x55/0x80 kernel/locking/spinlock.c:194
Code: 80 db 0d 87 e8 7c f1 b5 fc 4c 89 f7 48 83 3d 01 dc 0c 02 00 74 30 e8 9e 0d 00 00 90 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 d6 96 4b fc 65 8b 05 27 6e 01 7b 85 c0 74 05 5b 41 5e 5d c3 e8
RSP: 0018:ffffc90000b87aa0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000a02 RCX: dffffc0000000000
RDX: ffffc9000c2e1000 RSI: 0000000000000a02 RDI: 0000000000000001
RBP: ffffc90000b87ab0 R08: ffffffff8792e0af R09: 1ffffffff0f25c15
R10: dffffc0000000000 R11: fffffbfff0f25c16 R12: ffff888121f23184
R13: 0000000000000000 R14: ffff8881f6f37d80 R15: 1ffff110243e4516
try_to_wake_up+0x5e4/0x1250 kernel/sched/core.c:4394
wake_up_process kernel/sched/core.c:4528 [inline]
wake_up_q+0xd8/0x1a0 kernel/sched/core.c:1032
futex_wake+0x5e9/0x8e0 kernel/futex/waitwake.c:188
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: 0033:0x7f704a79de99
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:00007f704b6470e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f704aa26188 RCX: 00007f704a79de99
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f704aa2618c
RBP: 00007f704aa26180 R08: 002dfa0dc85b7dec R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f704aa26218 R14: 00007fff8a6ec590 R15: 00007fff8a6ec678
Allocated by task 9260:
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
The buggy address belongs to the object at ffff8881512ab880
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
64-byte region [ffff8881512ab880, ffff8881512ab8c0)
The buggy address belongs to the physical page:
page:ffffea000544aac0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1512ab
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004c09700 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5400, tgid 5396 (syz.2.1415), ts 136092747479, free_ts 136083767577
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_node_trace+0x26/0xb0 mm/slab_common.c:1041
kmalloc_node include/linux/slab.h:585 [inline]
kzalloc_node include/linux/slab.h:710 [inline]
__get_vm_area_node+0x12c/0x360 mm/vmalloc.c:2515
__vmalloc_node_range+0x326/0x1440 mm/vmalloc.c:3216
__vmalloc_node mm/vmalloc.c:3321 [inline]
vzalloc+0x78/0x90 mm/vmalloc.c:3394
bpf_check+0x22a/0x10e90 kernel/bpf/verifier.c:15485
bpf_prog_load+0x10f4/0x1670 kernel/bpf/syscall.c:2624
__sys_bpf+0x57b/0x850 kernel/bpf/syscall.c:5006
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
free_pages+0x82/0x90 mm/page_alloc.c:6031
_pgd_free arch/x86/mm/pgtable.c:420 [inline]
pgd_free+0x1a2/0x1c0 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+0x338/0x340 kernel/fork.c:1331
mmput+0x4b/0x150 kernel/fork.c:1343
exit_mm kernel/exit.c:569 [inline]
do_exit+0xa51/0x2850 kernel/exit.c:874
__do_sys_exit kernel/exit.c:996 [inline]
__se_sys_exit kernel/exit.c:994 [inline]
__cfi___ia32_sys_exit+0x0/0x10 kernel/exit.c:994
x64_sys_call+0x67/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:61
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:
ffff8881512ab780: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8881512ab800: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8881512ab880: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff8881512ab900: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8881512ab980: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 80 db 0d sbb $0xd,%bl
3: 87 e8 xchg %ebp,%eax
5: 7c f1 jl 0xfffffff8
7: b5 fc mov $0xfc,%ch
9: 4c 89 f7 mov %r14,%rdi
c: 48 83 3d 01 dc 0c 02 cmpq $0x0,0x20cdc01(%rip) # 0x20cdc15
13: 00
14: 74 30 je 0x46
16: e8 9e 0d 00 00 call 0xdb9
1b: 90 nop
1c: f7 c3 00 02 00 00 test $0x200,%ebx
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 d6 96 4b fc call 0xfc4b9705 <-- trapping instruction
2f: 65 8b 05 27 6e 01 7b mov %gs:0x7b016e27(%rip),%eax # 0x7b016e5d
36: 85 c0 test %eax,%eax
38: 74 05 je 0x3f
3a: 5b pop %rbx
3b: 41 5e pop %r14
3d: 5d pop %rbp
3e: c3 ret
3f: e8 .byte 0xe8