[ 16.195476][ T66] ================================================================== [ 16.195843][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 16.196126][ T66] Read of size 8 at addr ffff88800bd380f8 by task kworker/u16:1/66 [ 16.196403][ T66] [ 16.196501][ T66] CPU: 1 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 16.196792][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 16.197076][ T66] Workqueue: netns cleanup_net [ 16.197279][ T66] Call Trace: [ 16.197437][ T66] [ 16.197518][ T66] dump_stack_lvl+0x82/0xd0 [ 16.197667][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 16.197854][ T66] ? cleanup_net+0x932/0xa40 [ 16.198000][ T66] print_report+0xb4/0x270 [ 16.198127][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 16.198262][ T66] kasan_report+0xbd/0xf0 [ 16.198375][ T66] ? cleanup_net+0x932/0xa40 [ 16.198521][ T66] cleanup_net+0x932/0xa40 [ 16.198666][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 16.198819][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 16.198961][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 16.199106][ T66] ? lock_acquire+0x32/0xc0 [ 16.199250][ T66] ? process_one_work+0xe0b/0x16d0 [ 16.199401][ T66] process_one_work+0xe55/0x16d0 [ 16.199549][ T66] ? __pfx___lock_release+0x10/0x10 [ 16.199694][ T66] ? __pfx_process_one_work+0x10/0x10 [ 16.199846][ T66] ? assign_work+0x16c/0x240 [ 16.199991][ T66] worker_thread+0x58c/0xce0 [ 16.200136][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 16.200327][ T66] ? __pfx_worker_thread+0x10/0x10 [ 16.200471][ T66] ? __pfx_worker_thread+0x10/0x10 [ 16.200615][ T66] kthread+0x28a/0x350 [ 16.200725][ T66] ? __pfx_kthread+0x10/0x10 [ 16.200871][ T66] ret_from_fork+0x31/0x70 [ 16.201041][ T66] ? __pfx_kthread+0x10/0x10 [ 16.201223][ T66] ret_from_fork_asm+0x1a/0x30 [ 16.201426][ T66] [ 16.201559][ T66] [ 16.201631][ T66] Allocated by task 224: [ 16.201747][ T66] kasan_save_stack+0x24/0x50 [ 16.201933][ T66] kasan_save_track+0x14/0x30 [ 16.202075][ T66] __kasan_slab_alloc+0x59/0x70 [ 16.202219][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 16.202367][ T66] copy_net_ns+0xc6/0x340 [ 16.202474][ T66] create_new_namespaces+0x35f/0x920 [ 16.202619][ T66] unshare_nsproxy_namespaces+0x8d/0x130 [ 16.202764][ T66] ksys_unshare+0x2a9/0x660 [ 16.202920][ T66] __x64_sys_unshare+0x31/0x40 [ 16.203061][ T66] do_syscall_64+0xc1/0x1d0 [ 16.203204][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.203382][ T66] [ 16.203455][ T66] Freed by task 66: [ 16.203564][ T66] kasan_save_stack+0x24/0x50 [ 16.203707][ T66] kasan_save_track+0x14/0x30 [ 16.203854][ T66] kasan_save_free_info+0x3b/0x60 [ 16.204006][ T66] __kasan_slab_free+0x38/0x50 [ 16.204148][ T66] kmem_cache_free+0xf8/0x330 [ 16.204288][ T66] cleanup_net+0x5a8/0xa40 [ 16.204427][ T66] process_one_work+0xe55/0x16d0 [ 16.204575][ T66] worker_thread+0x58c/0xce0 [ 16.204718][ T66] kthread+0x28a/0x350 [ 16.204828][ T66] ret_from_fork+0x31/0x70 [ 16.204985][ T66] ret_from_fork_asm+0x1a/0x30 [ 16.205134][ T66] [ 16.205208][ T66] Last potentially related work creation: [ 16.205350][ T66] kasan_save_stack+0x24/0x50 [ 16.205550][ T66] __kasan_record_aux_stack+0x8e/0xa0 [ 16.205710][ T66] insert_work+0x34/0x230 [ 16.205830][ T66] __queue_work+0x5fd/0xa40 [ 16.205993][ T66] queue_delayed_work_on+0x8c/0xa0 [ 16.206183][ T66] __inet_insert_ifa+0x751/0xb10 [ 16.206337][ T66] inet_rtm_newaddr+0x833/0xbd0 [ 16.206496][ T66] rtnetlink_rcv_msg+0x712/0xc10 [ 16.206658][ T66] netlink_rcv_skb+0x130/0x360 [ 16.206834][ T66] netlink_unicast+0x44b/0x710 [ 16.206999][ T66] netlink_sendmsg+0x723/0xbe0 [ 16.207164][ T66] ____sys_sendmsg+0x7ac/0xa10 [ 16.207325][ T66] ___sys_sendmsg+0xee/0x170 [ 16.207496][ T66] __sys_sendmsg+0x109/0x1a0 [ 16.207665][ T66] do_syscall_64+0xc1/0x1d0 [ 16.207822][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.208022][ T66] [ 16.208100][ T66] The buggy address belongs to the object at ffff88800bd38040 [ 16.208100][ T66] which belongs to the cache net_namespace of size 5696 [ 16.208498][ T66] The buggy address is located 184 bytes inside of [ 16.208498][ T66] freed 5696-byte region [ffff88800bd38040, ffff88800bd39680) [ 16.208883][ T66] [ 16.208956][ T66] The buggy address belongs to the physical page: [ 16.209161][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800bd3afc0 pfn:0xbd38 [ 16.209472][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 16.209700][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 16.209881][ T66] page_type: f5(slab) [ 16.209998][ T66] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 16.210239][ T66] raw: ffff88800bd3afc0 0000000000050002 00000001f5000000 0000000000000000 [ 16.210495][ T66] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 16.210739][ T66] head: ffff88800bd3afc0 0000000000050002 00000001f5000000 0000000000000000 [ 16.211000][ T66] head: 0080000000000003 ffffea00002f4e01 ffffffffffffffff 0000000000000000 [ 16.211227][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 16.211449][ T66] page dumped because: kasan: bad access detected [ 16.211608][ T66] [ 16.211675][ T66] Memory state around the buggy address: [ 16.211798][ T66] ffff88800bd37f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.211999][ T66] ffff88800bd38000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 16.212176][ T66] >ffff88800bd38080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 16.212364][ T66] ^ [ 16.212558][ T66] ffff88800bd38100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 16.212740][ T66] ffff88800bd38180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 16.212919][ T66] ================================================================== [ 16.213234][ T66] Disabling lock debugging due to kernel taint