[ 10.820671][ T66] ================================================================== [ 10.820936][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.821164][ T66] Read of size 8 at addr ffff88800afe80f8 by task kworker/u16:1/66 [ 10.821347][ T66] [ 10.821422][ T66] CPU: 1 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.821628][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.821790][ T66] Workqueue: netns cleanup_net [ 10.821925][ T66] Call Trace: [ 10.822025][ T66] [ 10.822095][ T66] dump_stack_lvl+0x82/0xd0 [ 10.822229][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 10.822390][ T66] ? cleanup_net+0x932/0xa40 [ 10.822529][ T66] print_report+0xb4/0x270 [ 10.822665][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 10.822795][ T66] kasan_report+0xbd/0xf0 [ 10.822898][ T66] ? cleanup_net+0x932/0xa40 [ 10.823031][ T66] cleanup_net+0x932/0xa40 [ 10.823159][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.823291][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 10.823420][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 10.823560][ T66] ? lock_acquire+0x32/0xc0 [ 10.823693][ T66] ? process_one_work+0xe0b/0x16d0 [ 10.823824][ T66] process_one_work+0xe55/0x16d0 [ 10.823950][ T66] ? __pfx___lock_release+0x10/0x10 [ 10.824075][ T66] ? __pfx_process_one_work+0x10/0x10 [ 10.824205][ T66] ? assign_work+0x16c/0x240 [ 10.824335][ T66] worker_thread+0x58c/0xce0 [ 10.824470][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.824633][ T66] ? __pfx_worker_thread+0x10/0x10 [ 10.824763][ T66] ? __pfx_worker_thread+0x10/0x10 [ 10.824894][ T66] kthread+0x28a/0x350 [ 10.824993][ T66] ? __pfx_kthread+0x10/0x10 [ 10.825122][ T66] ret_from_fork+0x31/0x70 [ 10.825249][ T66] ? __pfx_kthread+0x10/0x10 [ 10.825380][ T66] ret_from_fork_asm+0x1a/0x30 [ 10.825528][ T66] [ 10.825626][ T66] [ 10.825690][ T66] Allocated by task 226: [ 10.825786][ T66] kasan_save_stack+0x24/0x50 [ 10.825919][ T66] kasan_save_track+0x14/0x30 [ 10.826043][ T66] __kasan_slab_alloc+0x59/0x70 [ 10.826173][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.826301][ T66] copy_net_ns+0xc6/0x340 [ 10.826397][ T66] create_new_namespaces+0x35f/0x920 [ 10.826533][ T66] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.826665][ T66] ksys_unshare+0x2a9/0x660 [ 10.826792][ T66] __x64_sys_unshare+0x31/0x40 [ 10.826919][ T66] do_syscall_64+0xc1/0x1d0 [ 10.827046][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.827209][ T66] [ 10.827274][ T66] Freed by task 66: [ 10.827368][ T66] kasan_save_stack+0x24/0x50 [ 10.827513][ T66] kasan_save_track+0x14/0x30 [ 10.827640][ T66] kasan_save_free_info+0x3b/0x60 [ 10.827770][ T66] __kasan_slab_free+0x38/0x50 [ 10.827900][ T66] kmem_cache_free+0xf8/0x330 [ 10.828032][ T66] cleanup_net+0x5a8/0xa40 [ 10.828158][ T66] process_one_work+0xe55/0x16d0 [ 10.828282][ T66] worker_thread+0x58c/0xce0 [ 10.828414][ T66] kthread+0x28a/0x350 [ 10.828523][ T66] ret_from_fork+0x31/0x70 [ 10.828647][ T66] ret_from_fork_asm+0x1a/0x30 [ 10.828773][ T66] [ 10.828837][ T66] The buggy address belongs to the object at ffff88800afe8040 [ 10.828837][ T66] which belongs to the cache net_namespace of size 5696 [ 10.829167][ T66] The buggy address is located 184 bytes inside of [ 10.829167][ T66] freed 5696-byte region [ffff88800afe8040, ffff88800afe9680) [ 10.829478][ T66] [ 10.829543][ T66] The buggy address belongs to the physical page: [ 10.829697][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800afeafc0 pfn:0xafe8 [ 10.829953][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.830150][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.830315][ T66] page_type: f5(slab) [ 10.830420][ T66] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.830656][ T66] raw: ffff88800afeafc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.830872][ T66] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.831113][ T66] head: ffff88800afeafc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.831332][ T66] head: 0080000000000003 ffffea00002bfa01 ffffffffffffffff 0000000000000000 [ 10.831568][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.831786][ T66] page dumped because: kasan: bad access detected [ 10.831945][ T66] [ 10.832010][ T66] Memory state around the buggy address: [ 10.832135][ T66] ffff88800afe7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.832315][ T66] ffff88800afe8000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.832502][ T66] >ffff88800afe8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.832682][ T66] ^ [ 10.832861][ T66] ffff88800afe8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.833038][ T66] ffff88800afe8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.833213][ T66] ================================================================== [ 10.833520][ T66] Disabling lock debugging due to kernel taint [ 11.344567][ T226] self-connect_ip (226) used greatest stack depth: 23664 bytes left