================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 Write of size 56 at addr ffff88810eb23590 by task syz.2.763/3125 CPU: 1 PID: 3125 Comm: syz.2.763 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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_0905f5867861f90a+0x21/0x34 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:perf_ioctl+0x1493/0x1e70 kernel/events/core.c:-1 Code: ff 49 c7 c7 f7 ff ff ff eb 20 e8 48 66 d7 ff e8 d3 e5 c3 ff 49 c7 c7 ea ff ff ff eb 08 e8 35 66 d7 ff 45 31 ff 4c 8b 74 24 18 <48> 8b 5c 24 78 48 89 df 48 83 c7 10 e8 fc b3 65 03 48 89 df e8 24 RSP: 0018:ffffc90000d17be0 EFLAGS: 00000246 RAX: ffffffff8199fe8d RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc90002a5f000 RSI: 000000000000002b RDI: 000000000000002c RBP: ffffc90000d17e80 R08: ffff888111acf0bf R09: 1ffff11022359e17 R10: dffffc0000000000 R11: ffffed1022359e18 R12: 0000000040042408 R13: dffffc0000000000 R14: fffff520001a2f8c R15: 0000000000000000 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856 x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17 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: 0033:0x7f813079ce59 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:00007f813156f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f8130a16090 RCX: 00007f813079ce59 RDX: 0000000000000008 RSI: 0000000040042408 RDI: 0000000000000009 RBP: 00007f8130832e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8130a16128 R14: 00007f8130a16090 R15: 00007ffe09ad66a8 Allocated by task 3123: 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 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496 __call_rcu_common kernel/rcu/tree.c:2807 [inline] call_rcu+0xcf/0xf50 kernel/rcu/tree.c:2926 collapse net/ipv4/fib_trie.c:703 [inline] resize+0x1ac2/0x1d60 net/ipv4/fib_trie.c:906 trie_rebalance net/ipv4/fib_trie.c:1106 [inline] fib_remove_alias+0x4f0/0x730 net/ipv4/fib_trie.c:1650 fib_table_delete+0xf47/0x1190 net/ipv4/fib_trie.c:1752 fib_magic net/ipv4/fib_frontend.c:1120 [inline] fib_del_ifaddr+0x16fb/0x1c80 net/ipv4/fib_frontend.c:1331 fib_inetaddr_event+0xc9/0x310 net/ipv4/fib_frontend.c:1462 notifier_call_chain kernel/notifier.c:87 [inline] blocking_notifier_call_chain+0xcb/0x150 kernel/notifier.c:382 __inet_del_ifa+0x81f/0xd90 net/ipv4/devinet.c:445 inet_del_ifa net/ipv4/devinet.c:482 [inline] inetdev_destroy net/ipv4/devinet.c:323 [inline] inetdev_event+0x6a0/0x10a0 net/ipv4/devinet.c:1615 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 net/core/dev.c:2074 [inline] unregister_netdevice_many+0x104a/0x1910 net/core/dev.c:11005 default_device_exit_batch+0x951/0x9f0 net/core/dev.c:11518 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x630/0xb10 net/core/net_namespace.c:604 process_one_work+0x717/0xc30 kernel/workqueue.c:2302 worker_thread+0xa4d/0x11d0 kernel/workqueue.c:2449 kthread+0x281/0x320 kernel/kthread.c:386 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88810eb23580 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff88810eb23580, ffff88810eb235c0) The buggy address belongs to the physical page: page:ffffea00043ac8c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10eb23 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea00047a69c0 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 2589093822, free_ts 2535848926 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 __do_kmalloc_node mm/slab_common.c:937 [inline] __kmalloc+0xa4/0x1e0 mm/slab_common.c:951 kmalloc include/linux/slab.h:568 [inline] kzalloc include/linux/slab.h:699 [inline] kobject_get_path+0xbf/0x200 lib/kobject.c:152 kobject_uevent_env+0x29f/0x720 lib/kobject_uevent.c:544 kobject_uevent+0x1d/0x30 lib/kobject_uevent.c:657 rx_queue_add_kobject net/core/net-sysfs.c:1068 [inline] net_rx_queue_update_kobjects+0x223/0x470 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 register_netdevice+0xec9/0x1550 net/core/dev.c:10206 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_pages_ok+0xb87/0xc80 mm/page_alloc.c:1838 free_the_page mm/page_alloc.c:865 [inline] __free_pages+0xec/0x100 mm/page_alloc.c:6020 free_large_kmalloc+0xae/0xf0 mm/slab_common.c:915 kfree+0x8b/0xf0 mm/slab_common.c:984 kvfree+0x35/0x40 mm/util.c:639 btf_add_type kernel/bpf/btf.c:1581 [inline] btf_check_all_metas+0x5d1/0xad0 kernel/bpf/btf.c:4647 btf_parse_vmlinux+0x437/0x940 kernel/bpf/btf.c:5236 bpf_get_btf_vmlinux+0x41/0x60 kernel/bpf/verifier.c:15457 btf_get_module_btf+0x85/0x200 kernel/bpf/btf.c:7282 register_btf_kfunc_id_set+0x44/0x600 kernel/bpf/btf.c:7500 register_nf_conntrack_bpf+0x1b/0xb0 net/netfilter/nf_conntrack_bpf.c:499 nf_conntrack_init_start+0x3c3/0x460 net/netfilter/nf_conntrack_core.c:2772 nf_conntrack_standalone_init+0x11/0x100 net/netfilter/nf_conntrack_standalone.c:1213 do_one_initcall+0x1d6/0x580 init/main.c:1433 do_initcall_level+0x174/0x2df init/main.c:1506 do_initcalls+0x50/0x92 init/main.c:1522 Memory state around the buggy address: ffff88810eb23480: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff88810eb23500: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88810eb23580: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff88810eb23600: 00 00 00 00 00 00 00 03 fc fc fc fc fc fc fc fc ffff88810eb23680: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 49 c7 c7 f7 ff ff ff mov $0xfffffffffffffff7,%r15 7: eb 20 jmp 0x29 9: e8 48 66 d7 ff call 0xffd76656 e: e8 d3 e5 c3 ff call 0xffc3e5e6 13: 49 c7 c7 ea ff ff ff mov $0xffffffffffffffea,%r15 1a: eb 08 jmp 0x24 1c: e8 35 66 d7 ff call 0xffd76656 21: 45 31 ff xor %r15d,%r15d 24: 4c 8b 74 24 18 mov 0x18(%rsp),%r14 * 29: 48 8b 5c 24 78 mov 0x78(%rsp),%rbx <-- trapping instruction 2e: 48 89 df mov %rbx,%rdi 31: 48 83 c7 10 add $0x10,%rdi 35: e8 fc b3 65 03 call 0x365b436 3a: 48 89 df mov %rbx,%rdi 3d: e8 .byte 0xe8 3e: 24 .byte 0x24