==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x868/0xcf0 kernel/bpf/stackmap.c:265
Write of size 8 at addr ffff888143b2c258 by task syz.2.951/9588
CPU: 0 UID: 0 PID: 9588 Comm: syz.2.951 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:perf_swevent_event+0x10e/0x5e0 kernel/events/core.c:10470
Code: 81 e6 00 01 00 00 31 ff e8 9f 49 d0 ff 48 81 e3 00 01 00 00 75 1e e8 b1 44 d0 ff e9 c2 00 00 00 e8 a7 44 d0 ff e9 70 04 00 00 9d 44 d0 ff e9 66 04 00 00 4d 8d b7 00 01 00 00 4c 89 f0 48 c1
RSP: 0018:ffffc9001b07ee60 EFLAGS: 00000246
RAX: ffffffff81ef66b6 RBX: 1ffff9200360fdd4 RCX: ffff8880306a3c00
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9001b07ef30 R08: ffffc9001b07efd7 R09: 0000000000000000
R10: ffffc9001b07efc8 R11: fffff5200360fdfb R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888055b412c0
perf_tp_event+0x4f6/0x1380 kernel/events/core.c:10992
perf_trace_run_bpf_submit+0xee/0x170 kernel/events/core.c:10916
do_perf_trace_lock include/trace/events/lock.h:50 [inline]
perf_trace_lock+0x2f8/0x3b0 include/trace/events/lock.h:50
__do_trace_lock_release include/trace/events/lock.h:69 [inline]
trace_lock_release include/trace/events/lock.h:69 [inline]
lock_release+0x3b2/0x3e0 kernel/locking/lockdep.c:5879
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
percpu_ref_put_many include/linux/percpu-refcount.h:337 [inline]
percpu_ref_put+0xf9/0x180 include/linux/percpu-refcount.h:351
obj_cgroup_put include/linux/memcontrol.h:784 [inline]
__memcg_slab_free_hook+0x12f/0x3d0 mm/memcontrol.c:3218
memcg_slab_free_hook mm/slub.c:2242 [inline]
slab_free mm/slub.c:4677 [inline]
kfree+0x255/0x440 mm/slub.c:4879
compute_scc+0xf04/0xfa0 kernel/bpf/verifier.c:24562
bpf_check+0x173f6/0x1d2d0 kernel/bpf/verifier.c:24691
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: 0033:0x7fdd6518ebe9
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:00007fdd65f49038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fdd653b5fa0 RCX: 00007fdd6518ebe9
RDX: 0000000000000048 RSI: 00002000000017c0 RDI: 0000000000000005
RBP: 00007fdd65211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdd653b6038 R14: 00007fdd653b5fa0 R15: 00007ffc2eac6a18
Allocated by task 9588:
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 ffff888143b2c000
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 [ffff888143b2c000, ffff888143b2c240)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x143b28
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88814e305201
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88801a44b280 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000000f5000000 ffff88814e305201
head: 057ff00000000040 ffff88801a44b280 dead000000000122 0000000000000000
head: 0000000000000000 0000000080100010 00000000f5000000 ffff88814e305201
head: 057ff00000000003 ffffea00050eca01 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 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 9396, tgid 9395 (syz.4.902), ts 271039318424, free_ts 261781418941
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_slab_page mm/slub.c:2489 [inline]
allocate_slab+0x65/0x370 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]
__kmalloc_cache_node_noprof+0x29a/0x3d0 mm/slub.c:4404
kmalloc_node_noprof include/linux/slab.h:928 [inline]
alloc_mem_cgroup_per_node_info mm/memcontrol.c:3664 [inline]
mem_cgroup_alloc mm/memcontrol.c:3746 [inline]
mem_cgroup_css_alloc+0x4b2/0x1f20 mm/memcontrol.c:3791
css_create kernel/cgroup/cgroup.c:5669 [inline]
cgroup_apply_control_enable+0x3d1/0xa80 kernel/cgroup/cgroup.c:3289
cgroup_mkdir+0xc40/0xe60 kernel/cgroup/cgroup.c:5893
kernfs_iop_mkdir+0x211/0x350 fs/kernfs/dir.c:1268
vfs_mkdir+0x303/0x510 fs/namei.c:4366
do_mkdirat+0x247/0x590 fs/namei.c:4399
__do_sys_mkdirat fs/namei.c:4416 [inline]
__se_sys_mkdirat fs/namei.c:4414 [inline]
__x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4414
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
page last free pid 9163 tgid 9162 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
__slab_free+0x303/0x3c0 mm/slub.c:4591
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]
ref_tracker_alloc+0x133/0x460 lib/ref_tracker.c:271
register_netdevice+0x14a3/0x1ae0 net/core/dev.c:11213
register_netdev+0x40/0x60 net/core/dev.c:11305
vti6_init_net+0x238/0x370 net/ipv6/ip6_vti.c:1158
ops_init+0x359/0x5c0 net/core/net_namespace.c:136
setup_net+0x10c/0x320 net/core/net_namespace.c:438
copy_net_ns+0x31b/0x4d0 net/core/net_namespace.c:570
create_new_namespaces+0x3f3/0x720 kernel/nsproxy.c:110
copy_namespaces+0x438/0x4b0 kernel/nsproxy.c:175
copy_process+0x1733/0x3c00 kernel/fork.c:2178
Memory state around the buggy address:
ffff888143b2c100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888143b2c180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888143b2c200: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
^
ffff888143b2c280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888143b2c300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 81 e6 00 01 00 00 and $0x100,%esi
6: 31 ff xor %edi,%edi
8: e8 9f 49 d0 ff call 0xffd049ac
d: 48 81 e3 00 01 00 00 and $0x100,%rbx
14: 75 1e jne 0x34
16: e8 b1 44 d0 ff call 0xffd044cc
1b: e9 c2 00 00 00 jmp 0xe2
20: e8 a7 44 d0 ff call 0xffd044cc
25: e9 70 04 00 00 jmp 0x49a
* 2a: e8 9d 44 d0 ff call 0xffd044cc <-- trapping instruction
2f: e9 66 04 00 00 jmp 0x49a
34: 4d 8d b7 00 01 00 00 lea 0x100(%r15),%r14
3b: 4c 89 f0 mov %r14,%rax
3e: 48 rex.W
3f: c1 .byte 0xc1