IPVS: lc: UDP 224.0.0.2:0 - no destination available
==================================================================
BUG: KASAN: slab-use-after-free in lec_arp_clear_vccs+0x6c/0x380 net/atm/lec.c:1260
Read of size 8 at addr ffff88802bcfa6d0 by task syz.0.14088/20662

CPU: 1 UID: 0 PID: 20662 Comm: syz.0.14088 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <IRQ>
 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
 lec_arp_clear_vccs+0x6c/0x380 net/atm/lec.c:1260
 lec_arp_expire_vcc+0x17d/0x320 net/atm/lec.c:1598
 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers kernel/time/timer.c:2372 [inline]
 __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
 run_timer_base kernel/time/timer.c:2393 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
 handle_softirqs+0x286/0x870 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:get_stack_info+0xd/0xf0 arch/x86/kernel/dumpstack_64.c:193
Code: 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 41 57 41 56 41 55 41 54 53 <48> 89 cb 49 89 d6 49 89 f7 48 85 f6 74 07 48 85 ff 75 10 eb 4d 65
RSP: 0018:ffffc9001a3e6cb8 EFLAGS: 00000246
RAX: 1ffff9200347cdb0 RBX: ffffc9001a3e6d48 RCX: ffffc9001a3e6d68
RDX: ffffc9001a3e6d48 RSI: ffff888054f31e40 RDI: ffffc9001a3e6ce8
RBP: ffffc9001a3e6d01 R08: ffffc9001a3e6da7 R09: 0000000000000000
R10: ffffc9001a3e6d48 R11: fffff5200347cdb5 R12: ffffc9001a3e6ce8
R13: ffffc9001a3e6d68 R14: ffffc9001a3e6d70 R15: 1ffff9200347cdae
 __unwind_start+0x43f/0x760 arch/x86/kernel/unwind_orc.c:727
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587
 kasan_save_free_info mm/kasan/kasan.h:406 [inline]
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2543 [inline]
 slab_free mm/slub.c:6638 [inline]
 kfree+0x19a/0x6d0 mm/slub.c:6845
 clear_jmp_history kernel/bpf/verifier.c:1647 [inline]
 free_verifier_state+0x197/0x230 kernel/bpf/verifier.c:1662
 pop_stack kernel/bpf/verifier.c:2067 [inline]
 do_check+0x7ff8/0xee10 kernel/bpf/verifier.c:20118
 do_check_common+0x1938/0x24e0 kernel/bpf/verifier.c:23259
 do_check_main kernel/bpf/verifier.c:23342 [inline]
 bpf_check+0x183de/0x1d720 kernel/bpf/verifier.c:24647
 bpf_prog_load+0x13ba/0x19e0 kernel/bpf/syscall.c:3078
 __sys_bpf+0x507/0x860 kernel/bpf/syscall.c:6150
 __do_sys_bpf kernel/bpf/syscall.c:6260 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6258 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6258
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd5b258f6c9
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:00007fd5b34bd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fd5b27e6090 RCX: 00007fd5b258f6c9
RDX: 0000000000000048 RSI: 0000200000000200 RDI: 0000000000000005
RBP: 00007fd5b2611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd5b27e6128 R14: 00007fd5b27e6090 R15: 00007ffdf00cf4b8
 </TASK>

Allocated by task 20556:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __kmalloc_cache_noprof+0x3d5/0x6f0 mm/slub.c:5771
 kmalloc_noprof include/linux/slab.h:957 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 add_one_compat_dev+0x25d/0x5c0 drivers/infiniband/core/device.c:989
 rdma_dev_init_net+0x1dd/0x270 drivers/infiniband/core/device.c:1221
 ops_init+0x35c/0x5c0 net/core/net_namespace.c:137
 setup_net+0xfe/0x320 net/core/net_namespace.c:446
 copy_net_ns+0x34e/0x4e0 net/core/net_namespace.c:581
 create_new_namespaces+0x3f3/0x720 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:218
 ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3129
 __do_sys_unshare kernel/fork.c:3200 [inline]
 __se_sys_unshare kernel/fork.c:3198 [inline]
 __x64_sys_unshare+0x38/0x50 kernel/fork.c:3198
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 20556:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587
 kasan_save_free_info mm/kasan/kasan.h:406 [inline]
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2543 [inline]
 slab_free mm/slub.c:6638 [inline]
 kfree+0x19a/0x6d0 mm/slub.c:6845
 device_release+0x9c/0x1c0 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x22b/0x480 lib/kobject.c:737
 remove_one_compat_dev drivers/infiniband/core/device.c:1040 [inline]
 rdma_dev_exit_net+0x1e8/0x340 drivers/infiniband/core/device.c:1176
 ops_exit_list net/core/net_namespace.c:199 [inline]
 ops_undo_list+0x49a/0x990 net/core/net_namespace.c:252
 setup_net+0x2d6/0x320 net/core/net_namespace.c:462
 copy_net_ns+0x34e/0x4e0 net/core/net_namespace.c:581
 create_new_namespaces+0x3f3/0x720 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:218
 ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3129
 __do_sys_unshare kernel/fork.c:3200 [inline]
 __se_sys_unshare kernel/fork.c:3198 [inline]
 __x64_sys_unshare+0x38/0x50 kernel/fork.c:3198
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802bcfa000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1744 bytes inside of
 freed 2048-byte region [ffff88802bcfa000, ffff88802bcfa800)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2bcf8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a027000 ffffea0001f76c00 dead000000000002
raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801a027000 ffffea0001f76c00 dead000000000002
head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000af3e01 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 13456, tgid 13455 (syz.1.3175), ts 281388839910, free_ts 280380986628
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
 prep_new_page mm/page_alloc.c:1858 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:3059 [inline]
 allocate_slab+0x96/0x350 mm/slub.c:3232
 new_slab mm/slub.c:3286 [inline]
 ___slab_alloc+0xf56/0x1990 mm/slub.c:4655
 __slab_alloc+0x65/0x100 mm/slub.c:4778
 __slab_alloc_node mm/slub.c:4854 [inline]
 slab_alloc_node mm/slub.c:5276 [inline]
 __do_kmalloc_node mm/slub.c:5649 [inline]
 __kmalloc_node_noprof+0x5cc/0x800 mm/slub.c:5656
 kmalloc_node_noprof include/linux/slab.h:987 [inline]
 qdisc_alloc+0x92/0x900 net/sched/sch_generic.c:951
 qdisc_create_dflt+0x8e/0x4e0 net/sched/sch_generic.c:1008
 mq_init+0x2dc/0x660 net/sched/sch_mq.c:90
 qdisc_create_dflt+0x13b/0x4e0 net/sched/sch_generic.c:1015
 attach_default_qdiscs net/sched/sch_generic.c:1197 [inline]
 dev_activate+0x1ce/0x1150 net/sched/sch_generic.c:1251
 __dev_open+0x69c/0x880 net/core/dev.c:1692
 __dev_change_flags+0x1ea/0x6d0 net/core/dev.c:9726
 netif_change_flags+0x88/0x1a0 net/core/dev.c:9789
page last free pid 5842 tgid 5842 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906
 __slab_free+0x2e7/0x390 mm/slub.c:5970
 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:352
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4978 [inline]
 slab_alloc_node mm/slub.c:5288 [inline]
 kmem_cache_alloc_noprof+0x367/0x6e0 mm/slub.c:5295
 getname_flags+0xb8/0x540 fs/namei.c:146
 getname include/linux/fs.h:2922 [inline]
 __do_sys_mkdirat fs/namei.c:4503 [inline]
 __se_sys_mkdirat fs/namei.c:4501 [inline]
 __x64_sys_mkdirat+0x7a/0xa0 fs/namei.c:4501
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88802bcfa580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802bcfa600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802bcfa680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff88802bcfa700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802bcfa780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	66 66 66 66 2e 0f 1f 	data16 data16 data16 cs nopw 0x0(%rax,%rax,1)
   7:	84 00 00 00 00 00
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	0f 1f 40 d6          	nopl   -0x2a(%rax)
  21:	41 57                	push   %r15
  23:	41 56                	push   %r14
  25:	41 55                	push   %r13
  27:	41 54                	push   %r12
  29:	53                   	push   %rbx
* 2a:	48 89 cb             	mov    %rcx,%rbx <-- trapping instruction
  2d:	49 89 d6             	mov    %rdx,%r14
  30:	49 89 f7             	mov    %rsi,%r15
  33:	48 85 f6             	test   %rsi,%rsi
  36:	74 07                	je     0x3f
  38:	48 85 ff             	test   %rdi,%rdi
  3b:	75 10                	jne    0x4d
  3d:	eb 4d                	jmp    0x8c
  3f:	65                   	gs