[ 24.969428][ T383] netem: version 1.3 [ 352.707630][ T67] ================================================================== [ 352.707875][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 352.708076][ T67] Read of size 8 at addr ffff88800ab365f8 by task kworker/u16:1/67 [ 352.708264][ T67] [ 352.708333][ T67] CPU: 1 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 352.708545][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 352.708709][ T67] Workqueue: netns cleanup_net [ 352.708844][ T67] Call Trace: [ 352.708945][ T67] [ 352.709015][ T67] dump_stack_lvl+0x82/0xd0 [ 352.709149][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 352.709314][ T67] ? cleanup_net+0x932/0xa40 [ 352.709447][ T67] print_report+0xb4/0x270 [ 352.709575][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 352.709704][ T67] kasan_report+0xbd/0xf0 [ 352.709801][ T67] ? cleanup_net+0x932/0xa40 [ 352.709929][ T67] cleanup_net+0x932/0xa40 [ 352.710055][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 352.710182][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 352.710310][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 352.710440][ T67] ? lock_acquire+0x32/0xc0 [ 352.710566][ T67] ? process_one_work+0xe0b/0x16d0 [ 352.710693][ T67] process_one_work+0xe55/0x16d0 [ 352.710820][ T67] ? __pfx___lock_release+0x10/0x10 [ 352.710954][ T67] ? __pfx_process_one_work+0x10/0x10 [ 352.711082][ T67] ? assign_work+0x16c/0x240 [ 352.711210][ T67] worker_thread+0x58c/0xce0 [ 352.711337][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 352.711494][ T67] ? __pfx_worker_thread+0x10/0x10 [ 352.711620][ T67] ? __pfx_worker_thread+0x10/0x10 [ 352.711743][ T67] kthread+0x28a/0x350 [ 352.711840][ T67] ? __pfx_kthread+0x10/0x10 [ 352.711969][ T67] ret_from_fork+0x31/0x70 [ 352.712100][ T67] ? __pfx_kthread+0x10/0x10 [ 352.712224][ T67] ret_from_fork_asm+0x1a/0x30 [ 352.712356][ T67] [ 352.712453][ T67] [ 352.712518][ T67] Allocated by task 314: [ 352.712615][ T67] kasan_save_stack+0x24/0x50 [ 352.712742][ T67] kasan_save_track+0x14/0x30 [ 352.712869][ T67] __kasan_slab_alloc+0x59/0x70 [ 352.712995][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 352.713121][ T67] copy_net_ns+0xc6/0x340 [ 352.713217][ T67] create_new_namespaces+0x35f/0x920 [ 352.713345][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 352.713474][ T67] ksys_unshare+0x2a9/0x660 [ 352.713604][ T67] __x64_sys_unshare+0x31/0x40 [ 352.713727][ T67] do_syscall_64+0xc1/0x1d0 [ 352.713859][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 352.714012][ T67] [ 352.714076][ T67] Freed by task 67: [ 352.714169][ T67] kasan_save_stack+0x24/0x50 [ 352.714294][ T67] kasan_save_track+0x14/0x30 [ 352.714418][ T67] kasan_save_free_info+0x3b/0x60 [ 352.714544][ T67] __kasan_slab_free+0x38/0x50 [ 352.714671][ T67] kmem_cache_free+0xf8/0x330 [ 352.714802][ T67] cleanup_net+0x5a8/0xa40 [ 352.714929][ T67] process_one_work+0xe55/0x16d0 [ 352.715053][ T67] worker_thread+0x58c/0xce0 [ 352.715177][ T67] kthread+0x28a/0x350 [ 352.715270][ T67] ret_from_fork+0x31/0x70 [ 352.715394][ T67] ret_from_fork_asm+0x1a/0x30 [ 352.715517][ T67] [ 352.715583][ T67] Last potentially related work creation: [ 352.715708][ T67] kasan_save_stack+0x24/0x50 [ 352.715841][ T67] __kasan_record_aux_stack+0x8e/0xa0 [ 352.715965][ T67] insert_work+0x34/0x230 [ 352.716060][ T67] __queue_work+0x5fd/0xa40 [ 352.716184][ T67] queue_delayed_work_on+0x8c/0xa0 [ 352.716308][ T67] __inet_insert_ifa+0x751/0xb10 [ 352.716435][ T67] inetdev_event+0xb18/0xcf0 [ 352.716560][ T67] notifier_call_chain+0xcd/0x150 [ 352.716689][ T67] __dev_notify_flags+0xe6/0x250 [ 352.716816][ T67] dev_change_flags+0xec/0x160 [ 352.716958][ T67] do_setlink.constprop.0+0x79d/0x2300 [ 352.717093][ T67] rtnl_newlink+0x6de/0xa80 [ 352.717219][ T67] rtnetlink_rcv_msg+0x712/0xc10 [ 352.717346][ T67] netlink_rcv_skb+0x130/0x360 [ 352.717474][ T67] netlink_unicast+0x44b/0x710 [ 352.717600][ T67] netlink_sendmsg+0x723/0xbe0 [ 352.717729][ T67] ____sys_sendmsg+0x7ac/0xa10 [ 352.717855][ T67] ___sys_sendmsg+0xee/0x170 [ 352.717982][ T67] __sys_sendmsg+0x109/0x1a0 [ 352.718106][ T67] do_syscall_64+0xc1/0x1d0 [ 352.718232][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 352.718387][ T67] [ 352.718453][ T67] The buggy address belongs to the object at ffff88800ab36540 [ 352.718453][ T67] which belongs to the cache net_namespace of size 6080 [ 352.718781][ T67] The buggy address is located 184 bytes inside of [ 352.718781][ T67] freed 6080-byte region [ffff88800ab36540, ffff88800ab37d00) [ 352.719081][ T67] [ 352.719146][ T67] The buggy address belongs to the physical page: [ 352.719296][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xab30 [ 352.719523][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 352.719711][ T67] flags: 0x80000000000040(head|node=0|zone=1) [ 352.719870][ T67] page_type: f5(slab) [ 352.719969][ T67] raw: 0080000000000040 ffff888001927240 ffff88800192c0a8 ffff88800192c0a8 [ 352.720192][ T67] raw: 0000000000000000 0000000000050005 00000001f5000000 0000000000000000 [ 352.720415][ T67] head: 0080000000000040 ffff888001927240 ffff88800192c0a8 ffff88800192c0a8 [ 352.720642][ T67] head: 0000000000000000 0000000000050005 00000001f5000000 0000000000000000 [ 352.720861][ T67] head: 0080000000000003 ffffea00002acc01 ffffffffffffffff 0000000000000000 [ 352.721081][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 352.721299][ T67] page dumped because: kasan: bad access detected [ 352.721459][ T67] [ 352.721524][ T67] Memory state around the buggy address: [ 352.721649][ T67] ffff88800ab36480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 352.721832][ T67] ffff88800ab36500: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 352.722009][ T67] >ffff88800ab36580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 352.722194][ T67] ^ [ 352.722371][ T67] ffff88800ab36600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 352.722550][ T67] ffff88800ab36680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 352.722728][ T67] ================================================================== [ 352.722959][ T67] Disabling lock debugging due to kernel taint