[ 11.454406][ T66] ================================================================== [ 11.454711][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 11.455005][ T66] Read of size 8 at addr ffff888009f200f8 by task kworker/u16:1/66 [ 11.455278][ T66] [ 11.455377][ T66] CPU: 3 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 11.455678][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.455920][ T66] Workqueue: netns cleanup_net [ 11.456127][ T66] Call Trace: [ 11.456225][ T66] [ 11.456289][ T66] dump_stack_lvl+0x82/0xd0 [ 11.456424][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 11.456649][ T66] ? cleanup_net+0x932/0xa40 [ 11.456781][ T66] print_report+0xb4/0x270 [ 11.456941][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 11.457072][ T66] kasan_report+0xbd/0xf0 [ 11.457198][ T66] ? cleanup_net+0x932/0xa40 [ 11.457401][ T66] cleanup_net+0x932/0xa40 [ 11.457564][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 11.457731][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 11.457890][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 11.458055][ T66] ? lock_acquire+0x32/0xc0 [ 11.458217][ T66] ? process_one_work+0xe0b/0x16d0 [ 11.458391][ T66] process_one_work+0xe55/0x16d0 [ 11.458558][ T66] ? __pfx___lock_release+0x10/0x10 [ 11.458723][ T66] ? __pfx_process_one_work+0x10/0x10 [ 11.458890][ T66] ? assign_work+0x16c/0x240 [ 11.459054][ T66] worker_thread+0x58c/0xce0 [ 11.459214][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 11.459416][ T66] ? __pfx_worker_thread+0x10/0x10 [ 11.459594][ T66] ? __pfx_worker_thread+0x10/0x10 [ 11.459727][ T66] kthread+0x28a/0x350 [ 11.459827][ T66] ? __pfx_kthread+0x10/0x10 [ 11.459954][ T66] ret_from_fork+0x31/0x70 [ 11.460097][ T66] ? __pfx_kthread+0x10/0x10 [ 11.460224][ T66] ret_from_fork_asm+0x1a/0x30 [ 11.460358][ T66] [ 11.460460][ T66] [ 11.460522][ T66] Allocated by task 227: [ 11.460616][ T66] kasan_save_stack+0x24/0x50 [ 11.460748][ T66] kasan_save_track+0x14/0x30 [ 11.460872][ T66] __kasan_slab_alloc+0x59/0x70 [ 11.461006][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 11.461141][ T66] copy_net_ns+0xc6/0x340 [ 11.461242][ T66] create_new_namespaces+0x35f/0x920 [ 11.461371][ T66] unshare_nsproxy_namespaces+0x8d/0x130 [ 11.461497][ T66] ksys_unshare+0x2a9/0x660 [ 11.461692][ T66] __x64_sys_unshare+0x31/0x40 [ 11.461849][ T66] do_syscall_64+0xc1/0x1d0 [ 11.462012][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 11.462208][ T66] [ 11.462289][ T66] Freed by task 66: [ 11.462415][ T66] kasan_save_stack+0x24/0x50 [ 11.462580][ T66] kasan_save_track+0x14/0x30 [ 11.462742][ T66] kasan_save_free_info+0x3b/0x60 [ 11.462896][ T66] __kasan_slab_free+0x38/0x50 [ 11.463054][ T66] kmem_cache_free+0xf8/0x330 [ 11.463218][ T66] cleanup_net+0x5a8/0xa40 [ 11.463378][ T66] process_one_work+0xe55/0x16d0 [ 11.463538][ T66] worker_thread+0x58c/0xce0 [ 11.463703][ T66] kthread+0x28a/0x350 [ 11.463828][ T66] ret_from_fork+0x31/0x70 [ 11.463987][ T66] ret_from_fork_asm+0x1a/0x30 [ 11.464144][ T66] [ 11.464223][ T66] The buggy address belongs to the object at ffff888009f20040 [ 11.464223][ T66] which belongs to the cache net_namespace of size 5696 [ 11.464637][ T66] The buggy address is located 184 bytes inside of [ 11.464637][ T66] freed 5696-byte region [ffff888009f20040, ffff888009f21680) [ 11.465018][ T66] [ 11.465082][ T66] The buggy address belongs to the physical page: [ 11.465245][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888009f22fc0 pfn:0x9f20 [ 11.465500][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 11.465695][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 11.465855][ T66] page_type: f5(slab) [ 11.465963][ T66] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.466207][ T66] raw: ffff888009f22fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.466443][ T66] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.466669][ T66] head: ffff888009f22fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.466886][ T66] head: 0080000000000003 ffffea000027c801 ffffffffffffffff 0000000000000000 [ 11.467111][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 11.467325][ T66] page dumped because: kasan: bad access detected [ 11.467495][ T66] [ 11.467568][ T66] Memory state around the buggy address: [ 11.467702][ T66] ffff888009f1ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.467894][ T66] ffff888009f20000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 11.468075][ T66] >ffff888009f20080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.468252][ T66] ^ [ 11.468430][ T66] ffff888009f20100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.468605][ T66] ffff888009f20180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.468778][ T66] ================================================================== [ 11.468982][ T66] Disabling lock debugging due to kernel taint