[ 10.757050][ T67] ================================================================== [ 10.757296][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.757498][ T67] Read of size 8 at addr ffff88800b4480f8 by task kworker/u16:1/67 [ 10.757707][ T67] [ 10.757794][ T67] CPU: 0 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.757986][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.758145][ T67] Workqueue: netns cleanup_net [ 10.758294][ T67] Call Trace: [ 10.758389][ T67] [ 10.758461][ T67] dump_stack_lvl+0x82/0xd0 [ 10.758594][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 10.758789][ T67] ? cleanup_net+0x932/0xa40 [ 10.758921][ T67] print_report+0xb4/0x270 [ 10.759049][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 10.759189][ T67] kasan_report+0xbd/0xf0 [ 10.759296][ T67] ? cleanup_net+0x932/0xa40 [ 10.759420][ T67] cleanup_net+0x932/0xa40 [ 10.759557][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.759694][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 10.759825][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 10.759949][ T67] ? lock_acquire+0x32/0xc0 [ 10.760073][ T67] ? process_one_work+0xe0b/0x16d0 [ 10.760201][ T67] process_one_work+0xe55/0x16d0 [ 10.760326][ T67] ? __pfx___lock_release+0x10/0x10 [ 10.760451][ T67] ? __pfx_process_one_work+0x10/0x10 [ 10.760580][ T67] ? assign_work+0x16c/0x240 [ 10.760703][ T67] worker_thread+0x58c/0xce0 [ 10.760824][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.760978][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.761105][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.761227][ T67] kthread+0x28a/0x350 [ 10.761323][ T67] ? __pfx_kthread+0x10/0x10 [ 10.761449][ T67] ret_from_fork+0x31/0x70 [ 10.761575][ T67] ? __pfx_kthread+0x10/0x10 [ 10.761700][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.761832][ T67] [ 10.761931][ T67] [ 10.761998][ T67] Allocated by task 226: [ 10.762098][ T67] kasan_save_stack+0x24/0x50 [ 10.762229][ T67] kasan_save_track+0x14/0x30 [ 10.762354][ T67] __kasan_slab_alloc+0x59/0x70 [ 10.762478][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.762609][ T67] copy_net_ns+0xc6/0x340 [ 10.762704][ T67] create_new_namespaces+0x35f/0x920 [ 10.762828][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.762954][ T67] ksys_unshare+0x2a9/0x660 [ 10.763083][ T67] __x64_sys_unshare+0x31/0x40 [ 10.763207][ T67] do_syscall_64+0xc1/0x1d0 [ 10.763333][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.763489][ T67] [ 10.763559][ T67] Freed by task 67: [ 10.763658][ T67] kasan_save_stack+0x24/0x50 [ 10.763791][ T67] kasan_save_track+0x14/0x30 [ 10.763916][ T67] kasan_save_free_info+0x3b/0x60 [ 10.764045][ T67] __kasan_slab_free+0x38/0x50 [ 10.764173][ T67] kmem_cache_free+0xf8/0x330 [ 10.764306][ T67] cleanup_net+0x5a8/0xa40 [ 10.764429][ T67] process_one_work+0xe55/0x16d0 [ 10.764553][ T67] worker_thread+0x58c/0xce0 [ 10.764675][ T67] kthread+0x28a/0x350 [ 10.764766][ T67] ret_from_fork+0x31/0x70 [ 10.764888][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.765009][ T67] [ 10.765074][ T67] The buggy address belongs to the object at ffff88800b448040 [ 10.765074][ T67] which belongs to the cache net_namespace of size 5696 [ 10.765409][ T67] The buggy address is located 184 bytes inside of [ 10.765409][ T67] freed 5696-byte region [ffff88800b448040, ffff88800b449680) [ 10.765708][ T67] [ 10.765772][ T67] The buggy address belongs to the physical page: [ 10.765927][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800b44afc0 pfn:0xb448 [ 10.766185][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.766372][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.766540][ T67] page_type: f5(slab) [ 10.766644][ T67] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.766882][ T67] raw: ffff88800b44afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.767108][ T67] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.767355][ T67] head: ffff88800b44afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.767575][ T67] head: 0080000000000003 ffffea00002d1201 ffffffffffffffff 0000000000000000 [ 10.767802][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.768051][ T67] page dumped because: kasan: bad access detected [ 10.768206][ T67] [ 10.768269][ T67] Memory state around the buggy address: [ 10.768407][ T67] ffff88800b447f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.768595][ T67] ffff88800b448000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.768779][ T67] >ffff88800b448080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.768962][ T67] ^ [ 10.769141][ T67] ffff88800b448100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.769321][ T67] ffff88800b448180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.769498][ T67] ================================================================== [ 10.769711][ T67] Disabling lock debugging due to kernel taint