[ 17.584343][ T268] ip (268) used greatest stack depth: 23424 bytes left
[ 20.000072][ T12] ==================================================================
[ 20.000390][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0
[ 20.000655][ T12] Read of size 1 at addr ffff8880086a16c4 by task kworker/u16:0/12
[ 20.000907][ T12]
[ 20.000994][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.000999][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.001002][ T12] Workqueue: netns cleanup_net
[ 20.001010][ T12] Call Trace:
[ 20.001013][ T12]
[ 20.001016][ T12] dump_stack_lvl+0x82/0xc0
[ 20.001024][ T12] print_address_description.constprop.0+0x2c/0x3a0
[ 20.001032][ T12] ? kobject_put+0xbb/0xd0
[ 20.001036][ T12] print_report+0xb4/0x270
[ 20.001040][ T12] ? kobject_put+0xbb/0xd0
[ 20.001043][ T12] ? kasan_addr_to_slab+0x21/0x70
[ 20.001047][ T12] ? kobject_put+0xbb/0xd0
[ 20.001050][ T12] kasan_report+0xca/0x100
[ 20.001054][ T12] ? kobject_put+0xbb/0xd0
[ 20.001059][ T12] kobject_put+0xbb/0xd0
[ 20.001062][ T12] netdev_run_todo+0x5f0/0xc60
[ 20.001068][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 20.001071][ T12] ? generic_xdp_install+0x410/0x410
[ 20.001074][ T12] ? net_generic+0xb1/0x1f0
[ 20.001082][ T12] ops_undo_list+0x714/0x890
[ 20.001088][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 20.001091][ T12] ? cleanup_net+0x2d6/0x8b0
[ 20.001097][ T12] cleanup_net+0x3b2/0x8b0
[ 20.001101][ T12] ? net_passive_dec+0x190/0x190
[ 20.001106][ T12] ? rcu_is_watching+0x12/0xb0
[ 20.001124][ T12] process_one_work+0xe35/0x1650
[ 20.001133][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 20.001139][ T12] ? assign_work+0x168/0x240
[ 20.001143][ T12] worker_thread+0x591/0xcf0
[ 20.001149][ T12] ? rescuer_thread+0xd10/0xd10
[ 20.001152][ T12] kthread+0x37b/0x5f0
[ 20.001156][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 20.001159][ T12] ? ret_from_fork+0x1b/0x270
[ 20.001164][ T12] ? __lock_release+0x5d/0x170
[ 20.001168][ T12] ? rcu_is_watching+0x12/0xb0
[ 20.001172][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 20.001175][ T12] ret_from_fork+0x1db/0x270
[ 20.001178][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 20.001181][ T12] ret_from_fork_asm+0x11/0x20
[ 20.001191][ T12]
[ 20.001192][ T12]
[ 20.008509][ T12] Allocated by task 262:
[ 20.008655][ T12] kasan_save_stack+0x24/0x40
[ 20.008861][ T12] kasan_save_track+0x14/0x30
[ 20.009058][ T12] __kasan_kmalloc+0x7b/0x90
[ 20.009258][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0
[ 20.009453][ T12] alloc_netdev_mqs+0x7d/0x1370
[ 20.009647][ T12] ip6_tnl_init_net+0x102/0x3f0
[ 20.009849][ T12] ops_init+0x189/0x550
[ 20.009997][ T12] setup_net+0xf1/0x380
[ 20.010141][ T12] copy_net_ns+0x253/0x510
[ 20.010339][ T12] create_new_namespaces+0x35f/0x900
[ 20.010528][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0
[ 20.010714][ T12] ksys_unshare+0x2be/0x6e0
[ 20.010904][ T12] __x64_sys_unshare+0x31/0x40
[ 20.011089][ T12] do_syscall_64+0xc1/0xfd0
[ 20.011356][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.011588][ T12]
[ 20.011691][ T12] Freed by task 12:
[ 20.011829][ T12] kasan_save_stack+0x24/0x40
[ 20.012044][ T12] kasan_save_track+0x14/0x30
[ 20.012227][ T12] __kasan_save_free_info+0x3b/0x60
[ 20.012417][ T12] __kasan_slab_free+0x3f/0x60
[ 20.012603][ T12] kfree+0x21d/0x540
[ 20.012742][ T12] device_release+0x9c/0x210
[ 20.012929][ T12] kobject_cleanup+0xfe/0x360
[ 20.013119][ T12] netdev_run_todo+0x81f/0xc60
[ 20.013323][ T12] ops_undo_list+0x714/0x890
[ 20.013509][ T12] cleanup_net+0x3b2/0x8b0
[ 20.013755][ T12] process_one_work+0xe35/0x1650
[ 20.013942][ T12] worker_thread+0x591/0xcf0
[ 20.014136][ T12] kthread+0x37b/0x5f0
[ 20.014289][ T12] ret_from_fork+0x1db/0x270
[ 20.014476][ T12] ret_from_fork_asm+0x11/0x20
[ 20.014682][ T12]
[ 20.014769][ T12] The buggy address belongs to the object at ffff8880086a1000
[ 20.014769][ T12] which belongs to the cache kmalloc-4k of size 4096
[ 20.015202][ T12] The buggy address is located 1732 bytes inside of
[ 20.015202][ T12] freed 4096-byte region [ffff8880086a1000, ffff8880086a2000)
[ 20.015632][ T12]
[ 20.015725][ T12] The buggy address belongs to the physical page:
[ 20.015946][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x86a0
[ 20.016272][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 20.016545][ T12] flags: 0x80000000000040(head|node=0|zone=1)
[ 20.016778][ T12] page_type: f5(slab)
[ 20.016926][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000220810 ffffea0000226610
[ 20.017244][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 20.017557][ T12] head: 0080000000000040 ffff888001043700 ffffea0000220810 ffffea0000226610
[ 20.017875][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
[ 20.018188][ T12] head: 0080000000000003 ffffea000021a801 00000000ffffffff 00000000ffffffff
[ 20.018537][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 20.018887][ T12] page dumped because: kasan: bad access detected
[ 20.019107][ T12]
[ 20.019202][ T12] Memory state around the buggy address:
[ 20.019370][ T12] ffff8880086a1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 20.019649][ T12] ffff8880086a1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 20.019914][ T12] >ffff8880086a1680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 20.020188][ T12] ^
[ 20.020404][ T12] ffff8880086a1700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 20.020668][ T12] ffff8880086a1780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 20.020931][ T12] ==================================================================
[ 20.023645][ T12] Disabling lock debugging due to kernel taint
[ 20.023931][ T12] ------------[ cut here ]------------
[ 20.024128][ T12] refcount_t: underflow; use-after-free.
[ 20.024395][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 20.024765][ T12] Modules linked in:
[ 20.024934][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.025391][ T12] Tainted: [B]=BAD_PAGE
[ 20.025550][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.025821][ T12] Workqueue: netns cleanup_net
[ 20.026035][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 20.026304][ T12] Code: cc 38 03 80 fb 01 0f 87 29 33 d7 fe 83 e3 01 0f 85 51 ff ff ff c6 05 17 cc 38 03 01 90 48 c7 c7 40 ba 85 b6 e8 62 d6 16 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 9d a0 ff e9 ba fe ff ff
[ 20.026999][ T12] RSP: 0000:ffffc900000c7a08 EFLAGS: 00010282
[ 20.027262][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 20.027571][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 20.027876][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6f00934
[ 20.028186][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001
[ 20.028507][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 20.028924][ T12] FS: 0000000000000000(0000) GS:ffff8880b4408000(0000) knlGS:0000000000000000
[ 20.029351][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 20.029732][ T12] CR2: 00007f446cfee444 CR3: 000000000c6df003 CR4: 0000000000772ef0
[ 20.030151][ T12] PKRU: 55555554
[ 20.030373][ T12] Call Trace:
[ 20.030589][ T12]
[ 20.030782][ T12] netdev_run_todo+0x5f0/0xc60
[ 20.031050][ T12] ? dev_ingress_queue_create+0x190/0x190
[ 20.031330][ T12] ? generic_xdp_install+0x410/0x410
[ 20.031597][ T12] ? net_generic+0xb1/0x1f0
[ 20.031881][ T12] ops_undo_list+0x714/0x890
[ 20.032156][ T12] ? rtnl_net_dumpid_one+0x270/0x270
[ 20.032415][ T12] ? cleanup_net+0x2d6/0x8b0
[ 20.032669][ T12] cleanup_net+0x3b2/0x8b0
[ 20.032917][ T12] ? net_passive_dec+0x190/0x190
[ 20.033159][ T12] ? rcu_is_watching+0x12/0xb0
[ 20.033425][ T12] process_one_work+0xe35/0x1650
[ 20.033686][ T12] ? pwq_dec_nr_in_flight+0x550/0x550
[ 20.033950][ T12] ? assign_work+0x168/0x240
[ 20.034207][ T12] worker_thread+0x591/0xcf0
[ 20.034476][ T12] ? rescuer_thread+0xd10/0xd10
[ 20.034753][ T12] kthread+0x37b/0x5f0
[ 20.034977][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 20.035253][ T12] ? ret_from_fork+0x1b/0x270
[ 20.035503][ T12] ? __lock_release+0x5d/0x170
[ 20.035772][ T12] ? rcu_is_watching+0x12/0xb0
[ 20.036060][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 20.036327][ T12] ret_from_fork+0x1db/0x270
[ 20.036615][ T12] ? kthread_is_per_cpu+0xc0/0xc0
[ 20.036894][ T12] ret_from_fork_asm+0x11/0x20
[ 20.037176][ T12]
[ 20.037393][ T12] irq event stamp: 9489
[ 20.037655][ T12] hardirqs last enabled at (9489): [] finish_task_switch.isra.0+0x245/0x960
[ 20.038118][ T12] hardirqs last disabled at (9488): [] __schedule+0x94a/0x1b10
[ 20.038522][ T12] softirqs last enabled at (9242): [] handle_softirqs+0x352/0x610
[ 20.038926][ T12] softirqs last disabled at (9209): [] irq_exit_rcu+0xab/0x100
[ 20.039320][ T12] ---[ end trace 0000000000000000 ]---