[ 11.360563][ T276] ip (276) used greatest stack depth: 23856 bytes left [ 16.486089][ T66] ================================================================== [ 16.486304][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 16.486495][ T66] Read of size 8 at addr ffff888004f500f8 by task kworker/u16:1/66 [ 16.486680][ T66] [ 16.486746][ T66] CPU: 0 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 16.486939][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 16.487097][ T66] Workqueue: netns cleanup_net [ 16.487225][ T66] Call Trace: [ 16.487319][ T66] <TASK> [ 16.487385][ T66] dump_stack_lvl+0x82/0xd0 [ 16.487514][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 16.487671][ T66] ? cleanup_net+0xa5d/0xb90 [ 16.487815][ T66] print_report+0xb4/0x270 [ 16.487946][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 16.488071][ T66] kasan_report+0xbd/0xf0 [ 16.488167][ T66] ? cleanup_net+0xa5d/0xb90 [ 16.488293][ T66] cleanup_net+0xa5d/0xb90 [ 16.488426][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 16.488558][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 16.488679][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 16.488805][ T66] ? lock_acquire+0x32/0xc0 [ 16.488929][ T66] ? process_one_work+0xe0b/0x16d0 [ 16.489057][ T66] process_one_work+0xe55/0x16d0 [ 16.489182][ T66] ? __pfx___lock_release+0x10/0x10 [ 16.489308][ T66] ? __pfx_process_one_work+0x10/0x10 [ 16.489433][ T66] ? assign_work+0x16c/0x240 [ 16.489556][ T66] worker_thread+0x58c/0xce0 [ 16.489677][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 16.489834][ T66] ? __pfx_worker_thread+0x10/0x10 [ 16.489960][ T66] ? __pfx_worker_thread+0x10/0x10 [ 16.490083][ T66] kthread+0x28a/0x350 [ 16.490178][ T66] ? __pfx_kthread+0x10/0x10 [ 16.490301][ T66] ret_from_fork+0x31/0x70 [ 16.490428][ T66] ? __pfx_kthread+0x10/0x10 [ 16.490553][ T66] ret_from_fork_asm+0x1a/0x30 [ 16.490684][ T66] </TASK> [ 16.490777][ T66] [ 16.490840][ T66] Allocated by task 274: [ 16.490934][ T66] kasan_save_stack+0x24/0x50 [ 16.491060][ T66] kasan_save_track+0x14/0x30 [ 16.491180][ T66] __kasan_slab_alloc+0x59/0x70 [ 16.491302][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 16.491426][ T66] copy_net_ns+0xc6/0x540 [ 16.491525][ T66] create_new_namespaces+0x35f/0x920 [ 16.491651][ T66] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 16.491776][ T66] ksys_unshare+0x2c4/0x6e0 [ 16.491901][ T66] __x64_sys_unshare+0x31/0x40 [ 16.492024][ T66] do_syscall_64+0xc1/0x1d0 [ 16.492148][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.492303][ T66] [ 16.492365][ T66] Freed by task 66: [ 16.492458][ T66] kasan_save_stack+0x24/0x50 [ 16.492582][ T66] kasan_save_track+0x14/0x30 [ 16.492704][ T66] kasan_save_free_info+0x3b/0x60 [ 16.492831][ T66] __kasan_slab_free+0x38/0x50 [ 16.492954][ T66] kmem_cache_free+0xf8/0x330 [ 16.493077][ T66] cleanup_net+0x5a8/0xb90 [ 16.493197][ T66] process_one_work+0xe55/0x16d0 [ 16.493318][ T66] worker_thread+0x58c/0xce0 [ 16.493439][ T66] kthread+0x28a/0x350 [ 16.493532][ T66] ret_from_fork+0x31/0x70 [ 16.493651][ T66] ret_from_fork_asm+0x1a/0x30 [ 16.493773][ T66] [ 16.493835][ T66] Last potentially related work creation: [ 16.493962][ T66] kasan_save_stack+0x24/0x50 [ 16.494087][ T66] __kasan_record_aux_stack+0x8e/0xa0 [ 16.494213][ T66] insert_work+0x34/0x230 [ 16.494305][ T66] __queue_work+0x5fd/0xa40 [ 16.494427][ T66] queue_delayed_work_on+0x8c/0xa0 [ 16.494558][ T66] __inet_insert_ifa+0x751/0xb10 [ 16.494688][ T66] inetdev_event+0xb18/0xcf0 [ 16.494814][ T66] notifier_call_chain+0xcd/0x150 [ 16.494944][ T66] __dev_notify_flags+0xe6/0x250 [ 16.495066][ T66] dev_change_flags+0xec/0x160 [ 16.495189][ T66] do_setlink.constprop.0+0x79d/0x2300 [ 16.495314][ T66] rtnl_newlink+0x6de/0xa80 [ 16.495439][ T66] rtnetlink_rcv_msg+0x712/0xc10 [ 16.495563][ T66] netlink_rcv_skb+0x130/0x360 [ 16.495688][ T66] netlink_unicast+0x44b/0x710 [ 16.495819][ T66] netlink_sendmsg+0x723/0xbe0 [ 16.495949][ T66] ____sys_sendmsg+0x7ac/0xa10 [ 16.496073][ T66] ___sys_sendmsg+0xee/0x170 [ 16.496203][ T66] __sys_sendmsg+0x109/0x1a0 [ 16.496327][ T66] do_syscall_64+0xc1/0x1d0 [ 16.496450][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.496608][ T66] [ 16.496674][ T66] The buggy address belongs to the object at ffff888004f50040 [ 16.496674][ T66] which belongs to the cache net_namespace of size 6528 [ 16.497001][ T66] The buggy address is located 184 bytes inside of [ 16.497001][ T66] freed 6528-byte region [ffff888004f50040, ffff888004f519c0) [ 16.497290][ T66] [ 16.497353][ T66] The buggy address belongs to the physical page: [ 16.497502][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888004f53640 pfn:0x4f50 [ 16.497746][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 16.497937][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 16.498093][ T66] page_type: f5(slab) [ 16.498188][ T66] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 16.498407][ T66] raw: ffff888004f53640 0000000000040002 00000001f5000000 0000000000000000 [ 16.498625][ T66] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 16.498846][ T66] head: ffff888004f53640 0000000000040002 00000001f5000000 0000000000000000 [ 16.499061][ T66] head: 0080000000000003 ffffea000013d401 ffffffffffffffff 0000000000000000 [ 16.499273][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 16.499483][ T66] page dumped because: kasan: bad access detected [ 16.499632][ T66] [ 16.499693][ T66] Memory state around the buggy address: [ 16.499814][ T66] ffff888004f4ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.499991][ T66] ffff888004f50000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 16.500164][ T66] >ffff888004f50080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 16.500341][ T66] ^ [ 16.500526][ T66] ffff888004f50100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 16.500711][ T66] ffff888004f50180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 16.500888][ T66] ================================================================== [ 16.501088][ T66] Disabling lock debugging due to kernel taint [ 57.774601][ T1346] br0: port 1(vx10) entered blocking state [ 57.774842][ T1346] br0: port 1(vx10) entered disabled state [ 57.775849][ T1346] vx10: entered allmulticast mode [ 57.776787][ T1346] vx10: entered promiscuous mode [ 58.667345][ T1373] vx10: left allmulticast mode [ 58.667519][ T1373] vx10: left promiscuous mode [ 58.667767][ T1373] br0: port 1(vx10) entered disabled state