[ 42.573203][ T486] ip (486) used greatest stack depth: 23952 bytes left [ 43.056139][ T68] ================================================================== [ 43.056361][ T68] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 43.056568][ T68] Read of size 8 at addr ffff88800ce900f8 by task kworker/u16:1/68 [ 43.056761][ T68] [ 43.056826][ T68] CPU: 3 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 43.057025][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 43.057185][ T68] Workqueue: netns cleanup_net [ 43.057319][ T68] Call Trace: [ 43.057416][ T68] [ 43.057483][ T68] dump_stack_lvl+0x82/0xd0 [ 43.057621][ T68] print_address_description.constprop.0+0x2c/0x3b0 [ 43.057773][ T68] ? cleanup_net+0xa5d/0xb90 [ 43.057906][ T68] print_report+0xb4/0x270 [ 43.058032][ T68] ? kasan_addr_to_slab+0x25/0x80 [ 43.058175][ T68] kasan_report+0xbd/0xf0 [ 43.058284][ T68] ? cleanup_net+0xa5d/0xb90 [ 43.058415][ T68] cleanup_net+0xa5d/0xb90 [ 43.058546][ T68] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 43.058678][ T68] ? __pfx_cleanup_net+0x10/0x10 [ 43.058810][ T68] ? trace_lock_acquire+0x148/0x1f0 [ 43.058939][ T68] ? lock_acquire+0x32/0xc0 [ 43.059075][ T68] ? process_one_work+0xe0b/0x16d0 [ 43.059205][ T68] process_one_work+0xe55/0x16d0 [ 43.059332][ T68] ? __pfx___lock_release+0x10/0x10 [ 43.059460][ T68] ? __pfx_process_one_work+0x10/0x10 [ 43.059587][ T68] ? assign_work+0x16c/0x240 [ 43.059718][ T68] worker_thread+0x58c/0xce0 [ 43.059849][ T68] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 43.060016][ T68] ? __pfx_worker_thread+0x10/0x10 [ 43.060143][ T68] ? __pfx_worker_thread+0x10/0x10 [ 43.060276][ T68] kthread+0x28a/0x350 [ 43.060374][ T68] ? __pfx_kthread+0x10/0x10 [ 43.060502][ T68] ret_from_fork+0x31/0x70 [ 43.060642][ T68] ? __pfx_kthread+0x10/0x10 [ 43.060769][ T68] ret_from_fork_asm+0x1a/0x30 [ 43.060901][ T68] [ 43.060999][ T68] [ 43.061080][ T68] Allocated by task 255: [ 43.061174][ T68] kasan_save_stack+0x24/0x50 [ 43.061306][ T68] kasan_save_track+0x14/0x30 [ 43.061432][ T68] __kasan_slab_alloc+0x59/0x70 [ 43.061566][ T68] kmem_cache_alloc_noprof+0x10b/0x350 [ 43.061697][ T68] copy_net_ns+0xc6/0x540 [ 43.061792][ T68] create_new_namespaces+0x35f/0x920 [ 43.061917][ T68] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 43.062050][ T68] ksys_unshare+0x2c4/0x6e0 [ 43.062176][ T68] __x64_sys_unshare+0x31/0x40 [ 43.062302][ T68] do_syscall_64+0xc1/0x1d0 [ 43.062428][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 43.062594][ T68] [ 43.062658][ T68] Freed by task 68: [ 43.062750][ T68] kasan_save_stack+0x24/0x50 [ 43.062874][ T68] kasan_save_track+0x14/0x30 [ 43.063003][ T68] kasan_save_free_info+0x3b/0x60 [ 43.063135][ T68] __kasan_slab_free+0x38/0x50 [ 43.063260][ T68] kmem_cache_free+0xf8/0x330 [ 43.063395][ T68] cleanup_net+0x5a8/0xb90 [ 43.063520][ T68] process_one_work+0xe55/0x16d0 [ 43.063650][ T68] worker_thread+0x58c/0xce0 [ 43.063775][ T68] kthread+0x28a/0x350 [ 43.063871][ T68] ret_from_fork+0x31/0x70 [ 43.063996][ T68] ret_from_fork_asm+0x1a/0x30 [ 43.064121][ T68] [ 43.064186][ T68] Last potentially related work creation: [ 43.064311][ T68] kasan_save_stack+0x24/0x50 [ 43.064443][ T68] __kasan_record_aux_stack+0x8e/0xa0 [ 43.064576][ T68] insert_work+0x34/0x230 [ 43.064671][ T68] __queue_work+0x5fd/0xa40 [ 43.064806][ T68] queue_delayed_work_on+0x8c/0xa0 [ 43.064932][ T68] __inet_insert_ifa+0x751/0xb10 [ 43.065061][ T68] inet_rtm_newaddr+0x833/0xbd0 [ 43.065188][ T68] rtnetlink_rcv_msg+0x712/0xc10 [ 43.065321][ T68] netlink_rcv_skb+0x130/0x360 [ 43.065450][ T68] netlink_unicast+0x44b/0x710 [ 43.065581][ T68] netlink_sendmsg+0x723/0xbe0 [ 43.065718][ T68] ____sys_sendmsg+0x7ac/0xa10 [ 43.065844][ T68] ___sys_sendmsg+0xee/0x170 [ 43.065971][ T68] __sys_sendmsg+0x109/0x1a0 [ 43.066107][ T68] do_syscall_64+0xc1/0x1d0 [ 43.066235][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 43.066394][ T68] [ 43.066461][ T68] The buggy address belongs to the object at ffff88800ce90040 [ 43.066461][ T68] which belongs to the cache net_namespace of size 6528 [ 43.066800][ T68] The buggy address is located 184 bytes inside of [ 43.066800][ T68] freed 6528-byte region [ffff88800ce90040, ffff88800ce919c0) [ 43.067108][ T68] [ 43.067173][ T68] The buggy address belongs to the physical page: [ 43.067339][ T68] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800ce95140 pfn:0xce90 [ 43.067593][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 43.067785][ T68] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 43.067947][ T68] page_type: f5(slab) [ 43.068043][ T68] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 43.068274][ T68] raw: ffff88800ce95140 0000000000040003 00000001f5000000 0000000000000000 [ 43.068501][ T68] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 43.068725][ T68] head: ffff88800ce95140 0000000000040003 00000001f5000000 0000000000000000 [ 43.068949][ T68] head: 0080000000000003 ffffea000033a401 ffffffffffffffff 0000000000000000 [ 43.069173][ T68] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 43.069393][ T68] page dumped because: kasan: bad access detected [ 43.069545][ T68] [ 43.069607][ T68] Memory state around the buggy address: [ 43.069732][ T68] ffff88800ce8ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 43.069914][ T68] ffff88800ce90000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 43.070105][ T68] >ffff88800ce90080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 43.070290][ T68] ^ [ 43.070469][ T68] ffff88800ce90100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 43.070647][ T68] ffff88800ce90180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 43.070834][ T68] ================================================================== [ 43.071042][ T68] Disabling lock debugging due to kernel taint