[ 81.999523][ T65] ================================================================== [ 81.999838][ T65] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 82.000026][ T65] Read of size 8 at addr ffff888009be80f8 by task kworker/u16:1/65 [ 82.000207][ T65] [ 82.000270][ T65] CPU: 1 UID: 0 PID: 65 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 82.000458][ T65] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 82.000613][ T65] Workqueue: netns cleanup_net [ 82.000741][ T65] Call Trace: [ 82.000838][ T65] [ 82.000903][ T65] dump_stack_lvl+0x82/0xd0 [ 82.001033][ T65] print_address_description.constprop.0+0x2c/0x3b0 [ 82.001190][ T65] ? cleanup_net+0xa5d/0xb90 [ 82.001320][ T65] print_report+0xb4/0x270 [ 82.001443][ T65] ? kasan_addr_to_slab+0x25/0x80 [ 82.001563][ T65] kasan_report+0xbd/0xf0 [ 82.001656][ T65] ? cleanup_net+0xa5d/0xb90 [ 82.001781][ T65] cleanup_net+0xa5d/0xb90 [ 82.001903][ T65] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 82.002033][ T65] ? __pfx_cleanup_net+0x10/0x10 [ 82.002157][ T65] ? trace_lock_acquire+0x148/0x1f0 [ 82.002282][ T65] ? lock_acquire+0x32/0xc0 [ 82.002414][ T65] ? process_one_work+0xe0b/0x16d0 [ 82.002542][ T65] process_one_work+0xe55/0x16d0 [ 82.002667][ T65] ? __pfx___lock_release+0x10/0x10 [ 82.002792][ T65] ? __pfx_process_one_work+0x10/0x10 [ 82.002925][ T65] ? assign_work+0x16c/0x240 [ 82.003051][ T65] worker_thread+0x58c/0xce0 [ 82.003174][ T65] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 82.003328][ T65] ? __pfx_worker_thread+0x10/0x10 [ 82.003453][ T65] ? __pfx_worker_thread+0x10/0x10 [ 82.003580][ T65] kthread+0x28a/0x350 [ 82.003676][ T65] ? __pfx_kthread+0x10/0x10 [ 82.003802][ T65] ret_from_fork+0x31/0x70 [ 82.003926][ T65] ? __pfx_kthread+0x10/0x10 [ 82.004047][ T65] ret_from_fork_asm+0x1a/0x30 [ 82.004173][ T65] [ 82.004266][ T65] [ 82.004366][ T65] Allocated by task 253: [ 82.004464][ T65] kasan_save_stack+0x24/0x50 [ 82.004589][ T65] kasan_save_track+0x14/0x30 [ 82.004714][ T65] __kasan_slab_alloc+0x59/0x70 [ 82.004849][ T65] kmem_cache_alloc_noprof+0x10b/0x350 [ 82.004973][ T65] copy_net_ns+0xc6/0x540 [ 82.005065][ T65] create_new_namespaces+0x35f/0x920 [ 82.005191][ T65] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 82.005315][ T65] ksys_unshare+0x2c4/0x6e0 [ 82.005440][ T65] __x64_sys_unshare+0x31/0x40 [ 82.005563][ T65] do_syscall_64+0xc1/0x1d0 [ 82.005692][ T65] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 82.005850][ T65] [ 82.005914][ T65] Freed by task 65: [ 82.006008][ T65] kasan_save_stack+0x24/0x50 [ 82.006133][ T65] kasan_save_track+0x14/0x30 [ 82.006255][ T65] kasan_save_free_info+0x3b/0x60 [ 82.006380][ T65] __kasan_slab_free+0x38/0x50 [ 82.006501][ T65] kmem_cache_free+0xf8/0x330 [ 82.006625][ T65] cleanup_net+0x5a8/0xb90 [ 82.006751][ T65] process_one_work+0xe55/0x16d0 [ 82.006874][ T65] worker_thread+0x58c/0xce0 [ 82.007100][ T65] kthread+0x28a/0x350 [ 82.007194][ T65] ret_from_fork+0x31/0x70 [ 82.007316][ T65] ret_from_fork_asm+0x1a/0x30 [ 82.007442][ T65] [ 82.007506][ T65] Last potentially related work creation: [ 82.007628][ T65] kasan_save_stack+0x24/0x50 [ 82.007756][ T65] __kasan_record_aux_stack+0x8e/0xa0 [ 82.007880][ T65] insert_work+0x34/0x230 [ 82.007975][ T65] __queue_work+0x5fd/0xa40 [ 82.008097][ T65] queue_delayed_work_on+0x8c/0xa0 [ 82.008219][ T65] __inet_insert_ifa+0x751/0xb10 [ 82.008343][ T65] inetdev_event+0xb18/0xcf0 [ 82.008474][ T65] notifier_call_chain+0xcd/0x150 [ 82.008598][ T65] __dev_notify_flags+0xe6/0x250 [ 82.008725][ T65] dev_change_flags+0xec/0x160 [ 82.008848][ T65] do_setlink.constprop.0+0x79d/0x2300 [ 82.008976][ T65] rtnl_newlink+0x6de/0xa80 [ 82.009100][ T65] rtnetlink_rcv_msg+0x712/0xc10 [ 82.009225][ T65] netlink_rcv_skb+0x130/0x360 [ 82.009351][ T65] netlink_unicast+0x44b/0x710 [ 82.009477][ T65] netlink_sendmsg+0x723/0xbe0 [ 82.009600][ T65] ____sys_sendmsg+0x7ac/0xa10 [ 82.009731][ T65] ___sys_sendmsg+0xee/0x170 [ 82.009855][ T65] __sys_sendmsg+0x109/0x1a0 [ 82.009979][ T65] do_syscall_64+0xc1/0x1d0 [ 82.010103][ T65] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 82.010257][ T65] [ 82.010320][ T65] The buggy address belongs to the object at ffff888009be8040 [ 82.010320][ T65] which belongs to the cache net_namespace of size 6528 [ 82.010648][ T65] The buggy address is located 184 bytes inside of [ 82.010648][ T65] freed 6528-byte region [ffff888009be8040, ffff888009be99c0) [ 82.010945][ T65] [ 82.011007][ T65] The buggy address belongs to the physical page: [ 82.011156][ T65] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888009beb640 pfn:0x9be8 [ 82.011406][ T65] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 82.011595][ T65] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 82.011754][ T65] page_type: f5(slab) [ 82.011853][ T65] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 82.012076][ T65] raw: ffff888009beb640 0000000000040002 00000001f5000000 0000000000000000 [ 82.012297][ T65] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 82.012538][ T65] head: ffff888009beb640 0000000000040002 00000001f5000000 0000000000000000 [ 82.012759][ T65] head: 0080000000000003 ffffea000026fa01 ffffffffffffffff 0000000000000000 [ 82.012980][ T65] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 82.013194][ T65] page dumped because: kasan: bad access detected [ 82.013348][ T65] [ 82.013413][ T65] Memory state around the buggy address: [ 82.013535][ T65] ffff888009be7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 82.013716][ T65] ffff888009be8000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 82.013900][ T65] >ffff888009be8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 82.014086][ T65] ^ [ 82.014272][ T65] ffff888009be8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 82.014450][ T65] ffff888009be8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 82.014628][ T65] ================================================================== [ 82.014886][ T65] Disabling lock debugging due to kernel taint [ 123.734230][ T1468] br0: port 1(vx10) entered blocking state [ 123.734435][ T1468] br0: port 1(vx10) entered disabled state [ 123.734626][ T1468] vx10: entered allmulticast mode [ 123.735545][ T1468] vx10: entered promiscuous mode [ 124.537355][ T1495] vx10: left allmulticast mode [ 124.537524][ T1495] vx10: left promiscuous mode [ 124.537768][ T1495] br0: port 1(vx10) entered disabled state