[ 11.587680][ T68] ================================================================== [ 11.588044][ T68] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 11.588365][ T68] Read of size 8 at addr ffff88800b6800f8 by task kworker/u16:1/68 [ 11.588577][ T68] [ 11.588643][ T68] CPU: 2 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 11.588852][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.589022][ T68] Workqueue: netns cleanup_net [ 11.589162][ T68] Call Trace: [ 11.589282][ T68] [ 11.589358][ T68] dump_stack_lvl+0x82/0xd0 [ 11.589504][ T68] print_address_description.constprop.0+0x2c/0x3b0 [ 11.589684][ T68] ? cleanup_net+0x932/0xa40 [ 11.589837][ T68] print_report+0xb4/0x270 [ 11.590004][ T68] ? kasan_addr_to_slab+0x25/0x80 [ 11.590133][ T68] kasan_report+0xbd/0xf0 [ 11.590257][ T68] ? cleanup_net+0x932/0xa40 [ 11.590387][ T68] cleanup_net+0x932/0xa40 [ 11.590511][ T68] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 11.590641][ T68] ? __pfx_cleanup_net+0x10/0x10 [ 11.590769][ T68] ? trace_lock_acquire+0x148/0x1f0 [ 11.590918][ T68] ? lock_acquire+0x32/0xc0 [ 11.591043][ T68] ? process_one_work+0xe0b/0x16d0 [ 11.591198][ T68] process_one_work+0xe55/0x16d0 [ 11.591337][ T68] ? __pfx___lock_release+0x10/0x10 [ 11.591466][ T68] ? __pfx_process_one_work+0x10/0x10 [ 11.591593][ T68] ? assign_work+0x16c/0x240 [ 11.591721][ T68] worker_thread+0x58c/0xce0 [ 11.591869][ T68] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 11.592037][ T68] ? __pfx_worker_thread+0x10/0x10 [ 11.592193][ T68] ? __pfx_worker_thread+0x10/0x10 [ 11.592396][ T68] kthread+0x28a/0x350 [ 11.592506][ T68] ? __pfx_kthread+0x10/0x10 [ 11.592654][ T68] ret_from_fork+0x31/0x70 [ 11.592847][ T68] ? __pfx_kthread+0x10/0x10 [ 11.593057][ T68] ret_from_fork_asm+0x1a/0x30 [ 11.593234][ T68] [ 11.593385][ T68] [ 11.593480][ T68] Allocated by task 227: [ 11.593588][ T68] kasan_save_stack+0x24/0x50 [ 11.593741][ T68] kasan_save_track+0x14/0x30 [ 11.593878][ T68] __kasan_slab_alloc+0x59/0x70 [ 11.594033][ T68] kmem_cache_alloc_noprof+0x10b/0x350 [ 11.594161][ T68] copy_net_ns+0xc6/0x340 [ 11.594256][ T68] create_new_namespaces+0x35f/0x920 [ 11.594396][ T68] unshare_nsproxy_namespaces+0x8d/0x130 [ 11.594533][ T68] ksys_unshare+0x2a9/0x660 [ 11.594659][ T68] __x64_sys_unshare+0x31/0x40 [ 11.594789][ T68] do_syscall_64+0xc1/0x1d0 [ 11.594945][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 11.595103][ T68] [ 11.595167][ T68] Freed by task 68: [ 11.595270][ T68] kasan_save_stack+0x24/0x50 [ 11.595405][ T68] kasan_save_track+0x14/0x30 [ 11.595544][ T68] kasan_save_free_info+0x3b/0x60 [ 11.595712][ T68] __kasan_slab_free+0x38/0x50 [ 11.595890][ T68] kmem_cache_free+0xf8/0x330 [ 11.596060][ T68] cleanup_net+0x5a8/0xa40 [ 11.596225][ T68] process_one_work+0xe55/0x16d0 [ 11.596359][ T68] worker_thread+0x58c/0xce0 [ 11.596499][ T68] kthread+0x28a/0x350 [ 11.596597][ T68] ret_from_fork+0x31/0x70 [ 11.596766][ T68] ret_from_fork_asm+0x1a/0x30 [ 11.596942][ T68] [ 11.597043][ T68] The buggy address belongs to the object at ffff88800b680040 [ 11.597043][ T68] which belongs to the cache net_namespace of size 5696 [ 11.597418][ T68] The buggy address is located 184 bytes inside of [ 11.597418][ T68] freed 5696-byte region [ffff88800b680040, ffff88800b681680) [ 11.597736][ T68] [ 11.597799][ T68] The buggy address belongs to the physical page: [ 11.597948][ T68] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800b682fc0 pfn:0xb680 [ 11.598241][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 11.598513][ T68] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 11.598742][ T68] page_type: f5(slab) [ 11.598856][ T68] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.599121][ T68] raw: ffff88800b682fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.599423][ T68] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.599701][ T68] head: ffff88800b682fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.600034][ T68] head: 0080000000000003 ffffea00002da001 ffffffffffffffff 0000000000000000 [ 11.600396][ T68] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 11.600721][ T68] page dumped because: kasan: bad access detected [ 11.600959][ T68] [ 11.601051][ T68] Memory state around the buggy address: [ 11.601234][ T68] ffff88800b67ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.601510][ T68] ffff88800b680000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 11.601774][ T68] >ffff88800b680080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.602049][ T68] ^ [ 11.602320][ T68] ffff88800b680100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.602586][ T68] ffff88800b680180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.602872][ T68] ================================================================== [ 11.603227][ T68] Disabling lock debugging due to kernel taint