[ 144.295528][ T68] ================================================================== [ 144.295811][ T68] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 144.296040][ T68] Read of size 8 at addr ffff888005af9c38 by task kworker/u16:1/68 [ 144.296259][ T68] [ 144.296356][ T68] CPU: 2 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 144.296591][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 144.296752][ T68] Workqueue: netns cleanup_net [ 144.296888][ T68] Call Trace: [ 144.296984][ T68] <TASK> [ 144.297054][ T68] dump_stack_lvl+0x82/0xd0 [ 144.297190][ T68] print_address_description.constprop.0+0x2c/0x3b0 [ 144.297354][ T68] ? cleanup_net+0x932/0xa40 [ 144.297480][ T68] print_report+0xb4/0x270 [ 144.297610][ T68] ? kasan_addr_to_slab+0x25/0x80 [ 144.297750][ T68] kasan_report+0xbd/0xf0 [ 144.297865][ T68] ? cleanup_net+0x932/0xa40 [ 144.298009][ T68] cleanup_net+0x932/0xa40 [ 144.298145][ T68] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 144.298275][ T68] ? __pfx_cleanup_net+0x10/0x10 [ 144.298400][ T68] ? trace_lock_acquire+0x148/0x1f0 [ 144.298537][ T68] ? lock_acquire+0x32/0xc0 [ 144.298686][ T68] ? process_one_work+0xe0b/0x16d0 [ 144.298833][ T68] process_one_work+0xe55/0x16d0 [ 144.298974][ T68] ? __pfx___lock_release+0x10/0x10 [ 144.299124][ T68] ? __pfx_process_one_work+0x10/0x10 [ 144.299269][ T68] ? assign_work+0x16c/0x240 [ 144.299419][ T68] worker_thread+0x58c/0xce0 [ 144.299545][ T68] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 144.299726][ T68] ? __pfx_worker_thread+0x10/0x10 [ 144.299855][ T68] ? __pfx_worker_thread+0x10/0x10 [ 144.299981][ T68] kthread+0x28a/0x350 [ 144.300077][ T68] ? __pfx_kthread+0x10/0x10 [ 144.300203][ T68] ret_from_fork+0x31/0x70 [ 144.300330][ T68] ? __pfx_kthread+0x10/0x10 [ 144.300455][ T68] ret_from_fork_asm+0x1a/0x30 [ 144.300586][ T68] </TASK> [ 144.300682][ T68] [ 144.300751][ T68] Allocated by task 324: [ 144.300851][ T68] kasan_save_stack+0x24/0x50 [ 144.300983][ T68] kasan_save_track+0x14/0x30 [ 144.301104][ T68] __kasan_slab_alloc+0x59/0x70 [ 144.301228][ T68] kmem_cache_alloc_noprof+0x10b/0x350 [ 144.301355][ T68] copy_net_ns+0xc6/0x340 [ 144.301456][ T68] create_new_namespaces+0x35f/0x920 [ 144.301580][ T68] unshare_nsproxy_namespaces+0x8d/0x130 [ 144.301711][ T68] ksys_unshare+0x2a9/0x660 [ 144.301838][ T68] __x64_sys_unshare+0x31/0x40 [ 144.301962][ T68] do_syscall_64+0xc1/0x1d0 [ 144.302087][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 144.302250][ T68] [ 144.302325][ T68] Freed by task 68: [ 144.302424][ T68] kasan_save_stack+0x24/0x50 [ 144.302572][ T68] kasan_save_track+0x14/0x30 [ 144.302719][ T68] kasan_save_free_info+0x3b/0x60 [ 144.302853][ T68] __kasan_slab_free+0x38/0x50 [ 144.302979][ T68] kmem_cache_free+0xf8/0x330 [ 144.303102][ T68] cleanup_net+0x5a8/0xa40 [ 144.303228][ T68] process_one_work+0xe55/0x16d0 [ 144.303356][ T68] worker_thread+0x58c/0xce0 [ 144.303482][ T68] kthread+0x28a/0x350 [ 144.303580][ T68] ret_from_fork+0x31/0x70 [ 144.303720][ T68] ret_from_fork_asm+0x1a/0x30 [ 144.303855][ T68] [ 144.303924][ T68] The buggy address belongs to the object at ffff888005af9b80 [ 144.303924][ T68] which belongs to the cache net_namespace of size 6592 [ 144.304295][ T68] The buggy address is located 184 bytes inside of [ 144.304295][ T68] freed 6592-byte region [ffff888005af9b80, ffff888005afb540) [ 144.304635][ T68] [ 144.304711][ T68] The buggy address belongs to the physical page: [ 144.304882][ T68] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888005afd200 pfn:0x5af8 [ 144.305154][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 144.305372][ T68] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 144.305535][ T68] page_type: f5(slab) [ 144.305657][ T68] raw: 0080000000000240 ffff888001963240 ffff888001968088 ffff888001968088 [ 144.305906][ T68] raw: ffff888005afd200 0000000000040003 00000001f5000000 0000000000000000 [ 144.306134][ T68] head: 0080000000000240 ffff888001963240 ffff888001968088 ffff888001968088 [ 144.306386][ T68] head: ffff888005afd200 0000000000040003 00000001f5000000 0000000000000000 [ 144.306644][ T68] head: 0080000000000003 ffffea000016be01 ffffffffffffffff 0000000000000000 [ 144.306863][ T68] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 144.307114][ T68] page dumped because: kasan: bad access detected [ 144.307273][ T68] [ 144.307350][ T68] Memory state around the buggy address: [ 144.307500][ T68] ffff888005af9b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 144.307696][ T68] ffff888005af9b80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 144.307891][ T68] >ffff888005af9c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 144.308099][ T68] ^ [ 144.308252][ T68] ffff888005af9c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 144.308461][ T68] ffff888005af9d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 144.308656][ T68] ================================================================== [ 144.308924][ T68] Disabling lock debugging due to kernel taint