erspan0 speed is unknown, defaulting to 1000
==================================================================
BUG: KASAN: slab-use-after-free in siw_query_port+0x346/0x430 drivers/infiniband/sw/siw/siw_verbs.c:177
Read of size 4 at addr ffff88802b5940e8 by task kworker/0:4/5081

CPU: 0 PID: 5081 Comm: kworker/0:4 Not tainted 6.4.0-syzkaller-01224-g1ef6663a587b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Workqueue: infiniband ib_cache_event_task
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:351 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:462
 kasan_report+0x176/0x1b0 mm/kasan/report.c:572
 siw_query_port+0x346/0x430 drivers/infiniband/sw/siw/siw_verbs.c:177
 ib_cache_update+0x1ac/0xb00 drivers/infiniband/core/cache.c:1487
 ib_cache_event_task+0xf3/0x1e0 drivers/infiniband/core/cache.c:1561
 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2408
 worker_thread+0xa63/0x1210 kernel/workqueue.c:2555
 kthread+0x2b8/0x350 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>

Allocated by task 5042:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4f/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:196 [inline]
 __do_kmalloc_node mm/slab_common.c:966 [inline]
 __kmalloc_node+0xb8/0x230 mm/slab_common.c:973
 kmalloc_node include/linux/slab.h:579 [inline]
 kvmalloc_node+0x72/0x180 mm/util.c:604
 kvmalloc include/linux/slab.h:697 [inline]
 kvzalloc include/linux/slab.h:705 [inline]
 alloc_netdev_mqs+0x89/0xf30 net/core/dev.c:10628
 __ip_tunnel_create+0x209/0x370 net/ipv4/ip_tunnel.c:254
 ip_tunnel_init_net+0x223/0x710 net/ipv4/ip_tunnel.c:1091
 ops_init+0x351/0x600 net/core/net_namespace.c:136
 setup_net+0x4b9/0xb90 net/core/net_namespace.c:339
 copy_net_ns+0x4cb/0x790 net/core/net_namespace.c:491
 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x122/0x170 kernel/nsproxy.c:228
 ksys_unshare+0x584/0xb20 kernel/fork.c:3441
 __do_sys_unshare kernel/fork.c:3512 [inline]
 __se_sys_unshare kernel/fork.c:3510 [inline]
 __x64_sys_unshare+0x38/0x40 kernel/fork.c:3510
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 6039:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4f/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:521
 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:162 [inline]
 slab_free_hook mm/slub.c:1781 [inline]
 slab_free_freelist_hook mm/slub.c:1807 [inline]
 slab_free mm/slub.c:3786 [inline]
 __kmem_cache_free+0x264/0x3c0 mm/slub.c:3799
 device_release+0x95/0x1c0
 kobject_cleanup lib/kobject.c:683 [inline]
 kobject_release lib/kobject.c:714 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x228/0x470 lib/kobject.c:731
 netdev_run_todo+0xe5a/0xf50 net/core/dev.c:10402
 ip_tunnel_delete_nets+0x2f6/0x340 net/ipv4/ip_tunnel.c:1145
 ops_exit_list net/core/net_namespace.c:175 [inline]
 cleanup_net+0x767/0xb80 net/core/net_namespace.c:614
 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2408
 worker_thread+0xa63/0x1210 kernel/workqueue.c:2555
 kthread+0x2b8/0x350 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

The buggy address belongs to the object at ffff88802b594000
 which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 232 bytes inside of
 freed 4096-byte region [ffff88802b594000, ffff88802b595000)

The buggy address belongs to the physical page:
page:ffffea0000ad6400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2b590
head:ffffea0000ad6400 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88802abcbb81
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000010200 ffff88801244f500 ffffea0000af3800 dead000000000002
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88802abcbb81
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 5032, tgid 5032 (syz-executor.4), ts 167169870440, free_ts 158847800932
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1744
 prep_new_page mm/page_alloc.c:1751 [inline]
 get_page_from_freelist+0x320e/0x3390 mm/page_alloc.c:3523
 __alloc_pages+0x255/0x670 mm/page_alloc.c:4794
 alloc_slab_page+0x6a/0x160 mm/slub.c:1851
 allocate_slab mm/slub.c:1998 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2051
 ___slab_alloc+0xa85/0x10a0 mm/slub.c:3192
 __slab_alloc mm/slub.c:3291 [inline]
 __slab_alloc_node mm/slub.c:3344 [inline]
 slab_alloc_node mm/slub.c:3441 [inline]
 __kmem_cache_alloc_node+0x1b8/0x290 mm/slub.c:3490
 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1057
 kmalloc include/linux/slab.h:559 [inline]
 kzalloc include/linux/slab.h:680 [inline]
 snmp6_alloc_dev net/ipv6/addrconf.c:353 [inline]
 ipv6_add_dev+0x5bb/0x1280 net/ipv6/addrconf.c:403
 addrconf_notify+0x683/0xfe0 net/ipv6/addrconf.c:3552
 notifier_call_chain+0x18c/0x3a0 kernel/notifier.c:93
 call_netdevice_notifiers_info net/core/dev.c:1935 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:1973 [inline]
 call_netdevice_notifiers+0x149/0x1c0 net/core/dev.c:1987
 register_netdevice+0x1349/0x1790 net/core/dev.c:10120
 register_netdev+0x3b/0x50 net/core/dev.c:10215
 vti6_init_net+0x20e/0x2c0 net/ipv6/ip6_vti.c:1162
 ops_init+0x351/0x600 net/core/net_namespace.c:136
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1308 [inline]
 free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2577
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2672
 qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:185
 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:292
 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:711
 slab_alloc_node mm/slub.c:3451 [inline]
 slab_alloc mm/slub.c:3459 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3466 [inline]
 kmem_cache_alloc+0x11f/0x2e0 mm/slub.c:3475
 vm_area_dup+0x27/0x280 kernel/fork.c:504
 __split_vma+0x1c7/0x7f0 mm/mmap.c:2248
 do_vmi_align_munmap+0x4bc/0x1900 mm/mmap.c:2384
 do_vmi_munmap+0x24a/0x2b0 mm/mmap.c:2527
 mmap_region+0x811/0x2250 mm/mmap.c:2575
 do_mmap+0x8d5/0xf80 mm/mmap.c:1394
 vm_mmap_pgoff+0x1db/0x410 mm/util.c:543
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88802b593f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802b594000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802b594080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff88802b594100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802b594180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================