[ 11.412718][ T250] tun: Universal TUN/TAP device driver, 1.6 [ 15.931377][ T282] packetdrill (282) used greatest stack depth: 24208 bytes left [ 15.977048][ T66] ================================================================== [ 15.977256][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 15.977444][ T66] Read of size 8 at addr ffff88800a3300f8 by task kworker/u16:1/66 [ 15.977625][ T66] [ 15.977691][ T66] CPU: 1 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 15.977876][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 15.978033][ T66] Workqueue: netns cleanup_net [ 15.978161][ T66] Call Trace: [ 15.978256][ T66] [ 15.978322][ T66] dump_stack_lvl+0x82/0xd0 [ 15.978451][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 15.978606][ T66] ? cleanup_net+0x932/0xa40 [ 15.978736][ T66] print_report+0xb4/0x270 [ 15.978861][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 15.978985][ T66] kasan_report+0xbd/0xf0 [ 15.979078][ T66] ? cleanup_net+0x932/0xa40 [ 15.979202][ T66] cleanup_net+0x932/0xa40 [ 15.979325][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 15.979451][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 15.979575][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 15.979703][ T66] ? lock_acquire+0x32/0xc0 [ 15.979826][ T66] ? process_one_work+0xe0b/0x16d0 [ 15.979950][ T66] process_one_work+0xe55/0x16d0 [ 15.980075][ T66] ? __pfx___lock_release+0x10/0x10 [ 15.980197][ T66] ? __pfx_process_one_work+0x10/0x10 [ 15.980321][ T66] ? assign_work+0x16c/0x240 [ 15.980444][ T66] worker_thread+0x58c/0xce0 [ 15.980569][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 15.980721][ T66] ? __pfx_worker_thread+0x10/0x10 [ 15.980844][ T66] ? __pfx_worker_thread+0x10/0x10 [ 15.980964][ T66] kthread+0x28a/0x350 [ 15.981059][ T66] ? __pfx_kthread+0x10/0x10 [ 15.981181][ T66] ret_from_fork+0x31/0x70 [ 15.981305][ T66] ? __pfx_kthread+0x10/0x10 [ 15.981431][ T66] ret_from_fork_asm+0x1a/0x30 [ 15.981560][ T66] [ 15.981652][ T66] [ 15.981715][ T66] Allocated by task 257: [ 15.981808][ T66] kasan_save_stack+0x24/0x50 [ 15.981933][ T66] kasan_save_track+0x14/0x30 [ 15.982054][ T66] __kasan_slab_alloc+0x59/0x70 [ 15.982176][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 15.982298][ T66] copy_net_ns+0xc6/0x340 [ 15.982394][ T66] create_new_namespaces+0x35f/0x920 [ 15.982518][ T66] unshare_nsproxy_namespaces+0x8d/0x130 [ 15.982640][ T66] ksys_unshare+0x2a9/0x660 [ 15.982763][ T66] __x64_sys_unshare+0x31/0x40 [ 15.982887][ T66] do_syscall_64+0xc1/0x1d0 [ 15.983010][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 15.983165][ T66] [ 15.983227][ T66] Freed by task 66: [ 15.983323][ T66] kasan_save_stack+0x24/0x50 [ 15.983447][ T66] kasan_save_track+0x14/0x30 [ 15.983590][ T66] kasan_save_free_info+0x3b/0x60 [ 15.983714][ T66] __kasan_slab_free+0x38/0x50 [ 15.983841][ T66] kmem_cache_free+0xf8/0x330 [ 15.983962][ T66] cleanup_net+0x5a8/0xa40 [ 15.984085][ T66] process_one_work+0xe55/0x16d0 [ 15.984208][ T66] worker_thread+0x58c/0xce0 [ 15.984334][ T66] kthread+0x28a/0x350 [ 15.984427][ T66] ret_from_fork+0x31/0x70 [ 15.984548][ T66] ret_from_fork_asm+0x1a/0x30 [ 15.984669][ T66] [ 15.984733][ T66] Last potentially related work creation: [ 15.984854][ T66] kasan_save_stack+0x24/0x50 [ 15.984978][ T66] __kasan_record_aux_stack+0x8e/0xa0 [ 15.985102][ T66] insert_work+0x34/0x230 [ 15.985198][ T66] __queue_work+0x5fd/0xa40 [ 15.985322][ T66] queue_delayed_work_on+0x8c/0xa0 [ 15.985445][ T66] __inet_insert_ifa+0x751/0xb10 [ 15.985569][ T66] inet_rtm_newaddr+0x833/0xbd0 [ 15.985691][ T66] rtnetlink_rcv_msg+0x712/0xc10 [ 15.985818][ T66] netlink_rcv_skb+0x130/0x360 [ 15.985943][ T66] netlink_unicast+0x44b/0x710 [ 15.986065][ T66] netlink_sendmsg+0x723/0xbe0 [ 15.986192][ T66] ____sys_sendmsg+0x7ac/0xa10 [ 15.986318][ T66] ___sys_sendmsg+0xee/0x170 [ 15.986443][ T66] __sys_sendmsg+0x109/0x1a0 [ 15.986566][ T66] do_syscall_64+0xc1/0x1d0 [ 15.986690][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 15.986845][ T66] [ 15.986907][ T66] The buggy address belongs to the object at ffff88800a330040 [ 15.986907][ T66] which belongs to the cache net_namespace of size 6592 [ 15.987231][ T66] The buggy address is located 184 bytes inside of [ 15.987231][ T66] freed 6592-byte region [ffff88800a330040, ffff88800a331a00) [ 15.987524][ T66] [ 15.987588][ T66] The buggy address belongs to the physical page: [ 15.987737][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800a3336c0 pfn:0xa330 [ 15.987984][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 15.988170][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 15.988328][ T66] page_type: f5(slab) [ 15.988425][ T66] raw: 0080000000000240 ffff888001963240 ffff888001968088 ffff888001968088 [ 15.988641][ T66] raw: ffff88800a3336c0 0000000000040002 00000001f5000000 0000000000000000 [ 15.988860][ T66] head: 0080000000000240 ffff888001963240 ffff888001968088 ffff888001968088 [ 15.989076][ T66] head: ffff88800a3336c0 0000000000040002 00000001f5000000 0000000000000000 [ 15.989291][ T66] head: 0080000000000003 ffffea000028cc01 ffffffffffffffff 0000000000000000 [ 15.989505][ T66] head: ffff888000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 15.989724][ T66] page dumped because: kasan: bad access detected [ 15.989874][ T66] [ 15.989937][ T66] Memory state around the buggy address: [ 15.990056][ T66] ffff88800a32ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 15.990235][ T66] ffff88800a330000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 15.990412][ T66] >ffff88800a330080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 15.990592][ T66] ^ [ 15.990774][ T66] ffff88800a330100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 15.990949][ T66] ffff88800a330180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 15.991125][ T66] ================================================================== [ 15.991350][ T66] Disabling lock debugging due to kernel taint