[ 11.811890][ T67] ================================================================== [ 11.812152][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 11.812390][ T67] Read of size 8 at addr ffff888005dd80f8 by task kworker/u16:1/67 [ 11.812585][ T67] [ 11.812685][ T67] CPU: 1 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 11.812916][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.813106][ T67] Workqueue: netns cleanup_net [ 11.813256][ T67] Call Trace: [ 11.813372][ T67] [ 11.813444][ T67] dump_stack_lvl+0x82/0xd0 [ 11.813579][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 11.813748][ T67] ? cleanup_net+0x932/0xa40 [ 11.813905][ T67] print_report+0xb4/0x270 [ 11.814043][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 11.814199][ T67] kasan_report+0xbd/0xf0 [ 11.814306][ T67] ? cleanup_net+0x932/0xa40 [ 11.814452][ T67] cleanup_net+0x932/0xa40 [ 11.814601][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 11.814750][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 11.814876][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 11.815051][ T67] ? lock_acquire+0x32/0xc0 [ 11.815221][ T67] ? process_one_work+0xe0b/0x16d0 [ 11.815405][ T67] process_one_work+0xe55/0x16d0 [ 11.815591][ T67] ? __pfx___lock_release+0x10/0x10 [ 11.815766][ T67] ? __pfx_process_one_work+0x10/0x10 [ 11.815898][ T67] ? assign_work+0x16c/0x240 [ 11.816032][ T67] worker_thread+0x58c/0xce0 [ 11.816268][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 11.816437][ T67] ? __pfx_worker_thread+0x10/0x10 [ 11.816574][ T67] ? __pfx_worker_thread+0x10/0x10 [ 11.816734][ T67] kthread+0x28a/0x350 [ 11.816835][ T67] ? __pfx_kthread+0x10/0x10 [ 11.816967][ T67] ret_from_fork+0x31/0x70 [ 11.817139][ T67] ? __pfx_kthread+0x10/0x10 [ 11.817270][ T67] ret_from_fork_asm+0x1a/0x30 [ 11.817436][ T67] [ 11.817539][ T67] [ 11.817608][ T67] Allocated by task 227: [ 11.817713][ T67] kasan_save_stack+0x24/0x50 [ 11.817888][ T67] kasan_save_track+0x14/0x30 [ 11.818028][ T67] __kasan_slab_alloc+0x59/0x70 [ 11.818201][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 11.818372][ T67] copy_net_ns+0xc6/0x340 [ 11.818479][ T67] create_new_namespaces+0x35f/0x920 [ 11.818624][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 11.818770][ T67] ksys_unshare+0x2a9/0x660 [ 11.818976][ T67] __x64_sys_unshare+0x31/0x40 [ 11.819120][ T67] do_syscall_64+0xc1/0x1d0 [ 11.819274][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 11.819449][ T67] [ 11.819516][ T67] Freed by task 67: [ 11.819641][ T67] kasan_save_stack+0x24/0x50 [ 11.819820][ T67] kasan_save_track+0x14/0x30 [ 11.819989][ T67] kasan_save_free_info+0x3b/0x60 [ 11.820164][ T67] __kasan_slab_free+0x38/0x50 [ 11.820311][ T67] kmem_cache_free+0xf8/0x330 [ 11.820442][ T67] cleanup_net+0x5a8/0xa40 [ 11.820609][ T67] process_one_work+0xe55/0x16d0 [ 11.820767][ T67] worker_thread+0x58c/0xce0 [ 11.820930][ T67] kthread+0x28a/0x350 [ 11.821035][ T67] ret_from_fork+0x31/0x70 [ 11.821176][ T67] ret_from_fork_asm+0x1a/0x30 [ 11.821319][ T67] [ 11.821408][ T67] The buggy address belongs to the object at ffff888005dd8040 [ 11.821408][ T67] which belongs to the cache net_namespace of size 5696 [ 11.821795][ T67] The buggy address is located 184 bytes inside of [ 11.821795][ T67] freed 5696-byte region [ffff888005dd8040, ffff888005dd9680) [ 11.822260][ T67] [ 11.822344][ T67] The buggy address belongs to the physical page: [ 11.822518][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888005ddafc0 pfn:0x5dd8 [ 11.822851][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 11.823079][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 11.823321][ T67] page_type: f5(slab) [ 11.823452][ T67] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.823714][ T67] raw: ffff888005ddafc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.823957][ T67] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.824271][ T67] head: ffff888005ddafc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.824538][ T67] head: 0080000000000003 ffffea0000177601 ffffffffffffffff 0000000000000000 [ 11.824852][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 11.825150][ T67] page dumped because: kasan: bad access detected [ 11.825326][ T67] [ 11.825407][ T67] Memory state around the buggy address: [ 11.825545][ T67] ffff888005dd7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.825783][ T67] ffff888005dd8000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 11.825983][ T67] >ffff888005dd8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.826206][ T67] ^ [ 11.826416][ T67] ffff888005dd8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.826713][ T67] ffff888005dd8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.826976][ T67] ================================================================== [ 11.827279][ T67] Disabling lock debugging due to kernel taint