==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 32 at addr ffff8881100d4f10 by task syz.2.467/1895
CPU: 1 PID: 1895 Comm: syz.2.467 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_b8aad64816793362+0x21/0x3a
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
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:should_fail_futex kernel/futex/core.c:80 [inline]
RIP: 0010:get_futex_key+0x122/0xb10 kernel/futex/core.c:241
Code: 58 0f 85 34 08 00 00 48 b8 fd ef ff ff ff 7f 00 00 49 39 c7 0f 83 2e 08 00 00 48 c7 84 24 80 00 00 00 00 00 00 00 84 db 75 10 <80> 3d ef de b5 05 00 74 07 e8 60 5e 0a 00 eb 1e be 01 00 00 00 48
RSP: 0018:ffffc900009a7a60 EFLAGS: 00000246
RAX: 00007fffffffeffd RBX: 0000000000000000 RCX: ffff888119a4d100
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900009a7b50 R08: ffffc900009a7bf7 R09: ffffc900009a7be0
R10: dffffc0000000000 R11: fffff52000134f7f R12: 1ffff92000134f58
R13: dffffc0000000000 R14: 0000000000000fac R15: 00007f00a2625fac
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: 0033:0x7f00a239de99
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:00007f00a32f40e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f00a2625fa8 RCX: 00007f00a239de99
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f00a2625fac
RBP: 00007f00a2625fa0 R08: 00003c649a79c358 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f00a2626038 R14: 00007ffd4d0ce7b0 R15: 00007ffd4d0ce898
Allocated by task 1895:
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 ffff8881100d4f00
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
64-byte region [ffff8881100d4f00, ffff8881100d4f40)
The buggy address belongs to the physical page:
page:ffffea0004403500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1100d4
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea00044cc800 dead000000000003 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 289, tgid 289 (syz-executor), ts 24679698768, free_ts 24675005511
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 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_slab+0xc7/0x1a0 mm/slub.c:2044
free_slab mm/slub.c:2059 [inline]
discard_slab+0x29/0x40 mm/slub.c:2065
__slab_free+0x201/0x280 mm/slub.c:3625
do_slab_free mm/slub.c:3666 [inline]
___cache_free+0xbf/0xd0 mm/slub.c:3722
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0xc6/0x140 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:311
kasan_slab_alloc include/linux/kasan.h:202 [inline]
slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768
slab_alloc_node mm/slub.c:3382 [inline]
__kmem_cache_alloc_node+0x194/0x2d0 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]
rx_queue_add_kobject net/core/net-sysfs.c:1054 [inline]
net_rx_queue_update_kobjects+0x147/0x470 net/core/net-sysfs.c:1108
register_queue_kobjects net/core/net-sysfs.c:1768 [inline]
netdev_register_kobject+0x23d/0x330 net/core/net-sysfs.c:2013
Memory state around the buggy address:
ffff8881100d4e00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8881100d4e80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8881100d4f00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff8881100d4f80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8881100d5000: 00 00 00 00 00 00 00 00 fc fc fc fc 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 58 pop %rax
1: 0f 85 34 08 00 00 jne 0x83b
7: 48 b8 fd ef ff ff ff movabs $0x7fffffffeffd,%rax
e: 7f 00 00
11: 49 39 c7 cmp %rax,%r15
14: 0f 83 2e 08 00 00 jae 0x848
1a: 48 c7 84 24 80 00 00 movq $0x0,0x80(%rsp)
21: 00 00 00 00 00
26: 84 db test %bl,%bl
28: 75 10 jne 0x3a
* 2a: 80 3d ef de b5 05 00 cmpb $0x0,0x5b5deef(%rip) # 0x5b5df20 <-- trapping instruction
31: 74 07 je 0x3a
33: e8 60 5e 0a 00 call 0xa5e98
38: eb 1e jmp 0x58
3a: be 01 00 00 00 mov $0x1,%esi
3f: 48 rex.W