[ 43.853674][ T68] ================================================================== [ 43.853966][ T68] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 43.854206][ T68] Read of size 8 at addr ffff8880050300f8 by task kworker/u16:1/68 [ 43.854400][ T68] [ 43.854467][ T68] CPU: 0 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 43.854667][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 43.854830][ T68] Workqueue: netns cleanup_net [ 43.854965][ T68] Call Trace: [ 43.855070][ T68] [ 43.855141][ T68] dump_stack_lvl+0x82/0xd0 [ 43.855276][ T68] print_address_description.constprop.0+0x2c/0x3b0 [ 43.855439][ T68] ? cleanup_net+0xa5d/0xb90 [ 43.855570][ T68] print_report+0xb4/0x270 [ 43.855702][ T68] ? kasan_addr_to_slab+0x25/0x80 [ 43.855831][ T68] kasan_report+0xbd/0xf0 [ 43.855929][ T68] ? cleanup_net+0xa5d/0xb90 [ 43.856054][ T68] cleanup_net+0xa5d/0xb90 [ 43.856177][ T68] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 43.856311][ T68] ? __pfx_cleanup_net+0x10/0x10 [ 43.856443][ T68] ? trace_lock_acquire+0x148/0x1f0 [ 43.856569][ T68] ? lock_acquire+0x32/0xc0 [ 43.856698][ T68] ? process_one_work+0xe0b/0x16d0 [ 43.856873][ T68] process_one_work+0xe55/0x16d0 [ 43.857023][ T68] ? __pfx___lock_release+0x10/0x10 [ 43.857155][ T68] ? __pfx_process_one_work+0x10/0x10 [ 43.857302][ T68] ? assign_work+0x16c/0x240 [ 43.857434][ T68] worker_thread+0x58c/0xce0 [ 43.857558][ T68] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 43.857715][ T68] ? __pfx_worker_thread+0x10/0x10 [ 43.857838][ T68] ? __pfx_worker_thread+0x10/0x10 [ 43.857963][ T68] kthread+0x28a/0x350 [ 43.858060][ T68] ? __pfx_kthread+0x10/0x10 [ 43.858197][ T68] ret_from_fork+0x31/0x70 [ 43.858322][ T68] ? __pfx_kthread+0x10/0x10 [ 43.858452][ T68] ret_from_fork_asm+0x1a/0x30 [ 43.858584][ T68] [ 43.858680][ T68] [ 43.858752][ T68] Allocated by task 258: [ 43.858848][ T68] kasan_save_stack+0x24/0x50 [ 43.858977][ T68] kasan_save_track+0x14/0x30 [ 43.859099][ T68] __kasan_slab_alloc+0x59/0x70 [ 43.859223][ T68] kmem_cache_alloc_noprof+0x10b/0x350 [ 43.859351][ T68] copy_net_ns+0xc6/0x540 [ 43.859446][ T68] create_new_namespaces+0x35f/0x920 [ 43.859574][ T68] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 43.859700][ T68] ksys_unshare+0x2c4/0x6e0 [ 43.859827][ T68] __x64_sys_unshare+0x31/0x40 [ 43.859952][ T68] do_syscall_64+0xc1/0x1d0 [ 43.860077][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 43.860228][ T68] [ 43.860294][ T68] Freed by task 68: [ 43.860397][ T68] kasan_save_stack+0x24/0x50 [ 43.860528][ T68] kasan_save_track+0x14/0x30 [ 43.860662][ T68] kasan_save_free_info+0x3b/0x60 [ 43.860789][ T68] __kasan_slab_free+0x38/0x50 [ 43.860913][ T68] kmem_cache_free+0xf8/0x330 [ 43.861037][ T68] cleanup_net+0x5a8/0xb90 [ 43.861164][ T68] process_one_work+0xe55/0x16d0 [ 43.861289][ T68] worker_thread+0x58c/0xce0 [ 43.861411][ T68] kthread+0x28a/0x350 [ 43.861506][ T68] ret_from_fork+0x31/0x70 [ 43.861630][ T68] ret_from_fork_asm+0x1a/0x30 [ 43.861757][ T68] [ 43.861824][ T68] Last potentially related work creation: [ 43.861962][ T68] kasan_save_stack+0x24/0x50 [ 43.862149][ T68] __kasan_record_aux_stack+0x8e/0xa0 [ 43.862284][ T68] insert_work+0x34/0x230 [ 43.862391][ T68] __queue_work+0x5fd/0xa40 [ 43.862538][ T68] queue_delayed_work_on+0x8c/0xa0 [ 43.862678][ T68] __inet_insert_ifa+0x751/0xb10 [ 43.862818][ T68] inetdev_event+0xb18/0xcf0 [ 43.862958][ T68] notifier_call_chain+0xcd/0x150 [ 43.863100][ T68] __dev_notify_flags+0xe6/0x250 [ 43.863245][ T68] dev_change_flags+0xec/0x160 [ 43.863385][ T68] do_setlink.constprop.0+0x79d/0x2300 [ 43.863529][ T68] rtnl_newlink+0x6de/0xa80 [ 43.863685][ T68] rtnetlink_rcv_msg+0x712/0xc10 [ 43.863835][ T68] netlink_rcv_skb+0x130/0x360 [ 43.863998][ T68] netlink_unicast+0x44b/0x710 [ 43.864149][ T68] netlink_sendmsg+0x723/0xbe0 [ 43.864291][ T68] ____sys_sendmsg+0x7ac/0xa10 [ 43.864433][ T68] ___sys_sendmsg+0xee/0x170 [ 43.864576][ T68] __sys_sendmsg+0x109/0x1a0 [ 43.864717][ T68] do_syscall_64+0xc1/0x1d0 [ 43.864870][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 43.865046][ T68] [ 43.865119][ T68] The buggy address belongs to the object at ffff888005030040 [ 43.865119][ T68] which belongs to the cache net_namespace of size 6528 [ 43.865513][ T68] The buggy address is located 184 bytes inside of [ 43.865513][ T68] freed 6528-byte region [ffff888005030040, ffff8880050319c0) [ 43.865857][ T68] [ 43.865929][ T68] The buggy address belongs to the physical page: [ 43.866110][ T68] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888005033640 pfn:0x5030 [ 43.866404][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 43.866632][ T68] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 43.866828][ T68] page_type: f5(slab) [ 43.866945][ T68] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 43.867209][ T68] raw: ffff888005033640 0000000000040002 00000001f5000000 0000000000000000 [ 43.867456][ T68] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 43.867685][ T68] head: ffff888005033640 0000000000040002 00000001f5000000 0000000000000000 [ 43.867921][ T68] head: 0080000000000003 ffffea0000140c01 ffffffffffffffff 0000000000000000 [ 43.868158][ T68] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 43.868391][ T68] page dumped because: kasan: bad access detected [ 43.868552][ T68] [ 43.868617][ T68] Memory state around the buggy address: [ 43.868743][ T68] ffff88800502ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 43.868943][ T68] ffff888005030000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 43.869135][ T68] >ffff888005030080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 43.869341][ T68] ^ [ 43.869548][ T68] ffff888005030100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 43.869763][ T68] ffff888005030180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 43.869969][ T68] ================================================================== [ 43.870215][ T68] Disabling lock debugging due to kernel taint