==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x868/0xcf0 kernel/bpf/stackmap.c:265
Write of size 8 at addr ffff88807e80ba58 by task syz.6.366/7621
CPU: 1 UID: 0 PID: 7621 Comm: syz.6.366 Not tainted 6.17.0-rc1-syzkaller-ge4414b01c1cd #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xca/0x240 mm/kasan/report.c:482
kasan_report+0x118/0x150 mm/kasan/report.c:595
__bpf_get_stackid+0x868/0xcf0 kernel/bpf/stackmap.c:265
____bpf_get_stackid_raw_tp kernel/trace/bpf_trace.c:1810 [inline]
bpf_get_stackid_raw_tp+0x196/0x210 kernel/trace/bpf_trace.c:1799
bpf_prog_b724608cae728045+0x27/0x2f
bpf_dispatcher_nop_func include/linux/bpf.h:1332 [inline]
__bpf_prog_run include/linux/filter.h:718 [inline]
bpf_prog_run include/linux/filter.h:725 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2257 [inline]
bpf_trace_run2+0x284/0x4b0 kernel/trace/bpf_trace.c:2298
__do_trace_kfree include/trace/events/kmem.h:94 [inline]
trace_kfree include/trace/events/kmem.h:94 [inline]
kfree+0x3a0/0x440 mm/slub.c:4866
slab_free_after_rcu_debug+0x60/0x2a0 mm/slub.c:4717
rcu_do_batch kernel/rcu/tree.c:2605 [inline]
rcu_core+0xca8/0x1770 kernel/rcu/tree.c:2861
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7288
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 5b 98 15 f6 e8 96 f2 4c f6 fb bf 01 00 00 00 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000bf56c80 EFLAGS: 00000282
RAX: 512a156ee84df000 RBX: 0000000000000000 RCX: 512a156ee84df000
RDX: 0000000000000000 RSI: ffffffff8d9b6d6c RDI: 0000000000000001
RBP: ffffc9000bf56d30 R08: ffffffff8fa37e37 R09: 1ffffffff1f46fc6
R10: dffffc0000000000 R11: fffffbfff1f46fc7 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920017ead90
irqentry_exit+0x6f/0x90 kernel/entry/common.c:197
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:debug_lockdep_rcu_enabled+0x16/0x40 kernel/rcu/update.c:320
Code: cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 31 c0 83 3d 57 40 2a 04 00 74 1e 83 3d 7a 70 2a 04 00 <74> 15 65 48 8b 0c 25 08 40 a0 92 31 c0 83 b9 ec 0a 00 00 00 0f 94
RSP: 0018:ffffc9000bf56df0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffffff81ac383c RCX: 512a156ee84df000
RDX: 0000000000000001 RSI: ffffffff8dba5fb5 RDI: ffffffff8be33380
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff8172c195
R10: ffffc9000bf56f18 R11: ffffffff81ac3890 R12: 1ffff920017eadd9
R13: ffffc9000bf56f00 R14: ffffc9000bf56ec8 R15: ffffffff8172c195
rcu_read_lock include/linux/rcupdate.h:842 [inline]
class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0xcb/0x2390 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
save_stack+0xf5/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:308
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895
___free_pages_bulk mm/kasan/shadow.c:332 [inline]
__kasan_populate_vmalloc mm/kasan/shadow.c:375 [inline]
kasan_populate_vmalloc+0x118/0x1a0 mm/kasan/shadow.c:417
alloc_vmap_area+0xd51/0x1490 mm/vmalloc.c:2092
__get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3187
__vmalloc_node_range_noprof+0x301/0x12f0 mm/vmalloc.c:3853
__vmalloc_node_noprof mm/vmalloc.c:3956 [inline]
vzalloc_noprof+0xb2/0xf0 mm/vmalloc.c:4030
bpf_check+0x1a5/0x1d2d0 kernel/bpf/verifier.c:24593
bpf_prog_load+0x1318/0x1930 kernel/bpf/syscall.c:2979
__sys_bpf+0x528/0x870 kernel/bpf/syscall.c:6029
__do_sys_bpf kernel/bpf/syscall.c:6139 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6137 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6137
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3e5eb8ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3e5f9f2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f3e5edb5fa0 RCX: 00007f3e5eb8ebe9
RDX: 0000000000000048 RSI: 00002000000017c0 RDI: 0000000000000005
RBP: 00007f3e5ec11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3e5edb6038 R14: 00007f3e5edb5fa0 R15: 00007ffc7d549808
Allocated by task 7621:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4365 [inline]
__kmalloc_node_noprof+0x276/0x4e0 mm/slub.c:4371
kmalloc_node_noprof include/linux/slab.h:932 [inline]
__bpf_map_area_alloc kernel/bpf/syscall.c:393 [inline]
bpf_map_area_alloc+0x64/0x180 kernel/bpf/syscall.c:406
prealloc_elems_and_freelist+0x86/0x1d0 kernel/bpf/stackmap.c:51
stack_map_alloc+0x33f/0x4c0 kernel/bpf/stackmap.c:114
map_create+0xaa0/0x14d0 kernel/bpf/syscall.c:1480
__sys_bpf+0x60f/0x870 kernel/bpf/syscall.c:6011
__do_sys_bpf kernel/bpf/syscall.c:6139 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6137 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6137
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88807e80b800
which belongs to the cache kmalloc-cg-1k of size 1024
The buggy address is located 24 bytes to the right of
allocated 576-byte region [ffff88807e80b800, ffff88807e80ba40)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e808
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888076170301
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a44b280 ffffea0001db4000 dead000000000002
raw: 0000000000000000 0000000080100010 00000000f5000000 ffff888076170301
head: 00fff00000000040 ffff88801a44b280 ffffea0001db4000 dead000000000002
head: 0000000000000000 0000000080100010 00000000f5000000 ffff888076170301
head: 00fff00000000003 ffffea0001fa0201 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5222, tgid 5222 (klogd), ts 74720529885, free_ts 74684877777
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:2487 [inline]
allocate_slab+0x8a/0x370 mm/slub.c:2655
new_slab mm/slub.c:2709 [inline]
___slab_alloc+0xbeb/0x1410 mm/slub.c:3891
__slab_alloc mm/slub.c:3981 [inline]
__slab_alloc_node mm/slub.c:4056 [inline]
slab_alloc_node mm/slub.c:4217 [inline]
__do_kmalloc_node mm/slub.c:4364 [inline]
__kmalloc_node_track_caller_noprof+0x2f8/0x4e0 mm/slub.c:4384
kmalloc_reserve+0x136/0x290 net/core/skbuff.c:600
__alloc_skb+0x142/0x2d0 net/core/skbuff.c:669
alloc_skb include/linux/skbuff.h:1336 [inline]
alloc_skb_with_frags+0xca/0x890 net/core/skbuff.c:6665
sock_alloc_send_pskb+0x857/0x990 net/core/sock.c:2980
unix_dgram_sendmsg+0x461/0x1850 net/unix/af_unix.c:2153
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:729
__sys_sendto+0x3bd/0x520 net/socket.c:2228
__do_sys_sendto net/socket.c:2235 [inline]
__se_sys_sendto net/socket.c:2231 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2231
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
page last free pid 5864 tgid 5864 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895
discard_slab mm/slub.c:2753 [inline]
__put_partials+0x156/0x1a0 mm/slub.c:3218
put_cpu_partial+0x17c/0x250 mm/slub.c:3293
__slab_free+0x2d5/0x3c0 mm/slub.c:4550
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:340
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4180 [inline]
slab_alloc_node mm/slub.c:4229 [inline]
__kmalloc_cache_noprof+0x1be/0x3d0 mm/slub.c:4391
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
kobject_uevent_env+0x27c/0x8c0 lib/kobject_uevent.c:540
__kobject_del+0xd2/0x300 lib/kobject.c:601
kobject_cleanup lib/kobject.c:680 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x243/0x480 lib/kobject.c:737
net_rx_queue_update_kobjects+0x695/0x740 net/core/net-sysfs.c:1336
netif_set_real_num_rx_queues+0x217/0x360 net/core/dev.c:3232
veth_init_queues drivers/net/veth.c:1798 [inline]
veth_newlink+0x718/0xa50 drivers/net/veth.c:1896
rtnl_newlink_create+0x30d/0xb00 net/core/rtnetlink.c:3825
__rtnl_newlink net/core/rtnetlink.c:3942 [inline]
rtnl_newlink+0x16d6/0x1c70 net/core/rtnetlink.c:4057
Memory state around the buggy address:
ffff88807e80b900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88807e80b980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807e80ba00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
^
ffff88807e80ba80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88807e80bb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 24 20 and $0x20,%al
2: f6 44 24 21 02 testb $0x2,0x21(%rsp)
7: 74 0c je 0x15
9: 90 nop
a: 0f 0b ud2
c: 48 f7 03 08 00 00 00 testq $0x8,(%rbx)
13: 74 64 je 0x79
15: bf 01 00 00 00 mov $0x1,%edi
1a: e8 5b 98 15 f6 call 0xf615987a
1f: e8 96 f2 4c f6 call 0xf64cf2ba
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 5b ab ff ff call 0xffffab8a <-- trapping instruction
2f: 48 c7 44 24 40 00 00 movq $0x0,0x40(%rsp)
36: 00 00
38: 9c pushf
39: 8f 44 24 40 pop 0x40(%rsp)
3d: 8b .byte 0x8b
3e: 44 rex.R
3f: 24 .byte 0x24