[ 11.210873][ T68] ================================================================== [ 11.211240][ T68] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 11.211556][ T68] Read of size 8 at addr ffff8880066800f8 by task kworker/u16:1/68 [ 11.211851][ T68] [ 11.211979][ T68] CPU: 2 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 11.212292][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.212563][ T68] Workqueue: netns cleanup_net [ 11.212790][ T68] Call Trace: [ 11.212949][ T68] [ 11.213060][ T68] dump_stack_lvl+0x82/0xd0 [ 11.213275][ T68] print_address_description.constprop.0+0x2c/0x3b0 [ 11.213539][ T68] ? cleanup_net+0x932/0xa40 [ 11.213755][ T68] print_report+0xb4/0x270 [ 11.213971][ T68] ? kasan_addr_to_slab+0x25/0x80 [ 11.214182][ T68] kasan_report+0xbd/0xf0 [ 11.214347][ T68] ? cleanup_net+0x932/0xa40 [ 11.214548][ T68] cleanup_net+0x932/0xa40 [ 11.214748][ T68] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 11.214956][ T68] ? __pfx_cleanup_net+0x10/0x10 [ 11.215145][ T68] ? trace_lock_acquire+0x148/0x1f0 [ 11.215384][ T68] ? lock_acquire+0x32/0xc0 [ 11.215574][ T68] ? process_one_work+0xe0b/0x16d0 [ 11.215764][ T68] process_one_work+0xe55/0x16d0 [ 11.215954][ T68] ? __pfx___lock_release+0x10/0x10 [ 11.216148][ T68] ? __pfx_process_one_work+0x10/0x10 [ 11.216342][ T68] ? assign_work+0x16c/0x240 [ 11.216530][ T68] worker_thread+0x58c/0xce0 [ 11.216714][ T68] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 11.216958][ T68] ? __pfx_worker_thread+0x10/0x10 [ 11.217177][ T68] ? __pfx_worker_thread+0x10/0x10 [ 11.217383][ T68] kthread+0x28a/0x350 [ 11.217544][ T68] ? __pfx_kthread+0x10/0x10 [ 11.217763][ T68] ret_from_fork+0x31/0x70 [ 11.217959][ T68] ? __pfx_kthread+0x10/0x10 [ 11.218139][ T68] ret_from_fork_asm+0x1a/0x30 [ 11.218331][ T68] [ 11.218479][ T68] [ 11.218576][ T68] Allocated by task 227: [ 11.218713][ T68] kasan_save_stack+0x24/0x50 [ 11.218921][ T68] kasan_save_track+0x14/0x30 [ 11.219104][ T68] __kasan_slab_alloc+0x59/0x70 [ 11.219290][ T68] kmem_cache_alloc_noprof+0x10b/0x350 [ 11.219487][ T68] copy_net_ns+0xc6/0x340 [ 11.219622][ T68] create_new_namespaces+0x35f/0x920 [ 11.219806][ T68] unshare_nsproxy_namespaces+0x8d/0x130 [ 11.219991][ T68] ksys_unshare+0x2a9/0x660 [ 11.220199][ T68] __x64_sys_unshare+0x31/0x40 [ 11.220386][ T68] do_syscall_64+0xc1/0x1d0 [ 11.220569][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 11.220798][ T68] [ 11.220895][ T68] Freed by task 68: [ 11.221034][ T68] kasan_save_stack+0x24/0x50 [ 11.221234][ T68] kasan_save_track+0x14/0x30 [ 11.221432][ T68] kasan_save_free_info+0x3b/0x60 [ 11.221613][ T68] __kasan_slab_free+0x38/0x50 [ 11.221800][ T68] kmem_cache_free+0xf8/0x330 [ 11.222002][ T68] cleanup_net+0x5a8/0xa40 [ 11.222160][ T68] process_one_work+0xe55/0x16d0 [ 11.222328][ T68] worker_thread+0x58c/0xce0 [ 11.222507][ T68] kthread+0x28a/0x350 [ 11.222662][ T68] ret_from_fork+0x31/0x70 [ 11.222842][ T68] ret_from_fork_asm+0x1a/0x30 [ 11.223047][ T68] [ 11.223154][ T68] The buggy address belongs to the object at ffff888006680040 [ 11.223154][ T68] which belongs to the cache net_namespace of size 5696 [ 11.223645][ T68] The buggy address is located 184 bytes inside of [ 11.223645][ T68] freed 5696-byte region [ffff888006680040, ffff888006681680) [ 11.224127][ T68] [ 11.224204][ T68] The buggy address belongs to the physical page: [ 11.224367][ T68] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888006682fc0 pfn:0x6680 [ 11.224631][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 11.224821][ T68] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 11.225039][ T68] page_type: f5(slab) [ 11.225165][ T68] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.225437][ T68] raw: ffff888006682fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.225690][ T68] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.225954][ T68] head: ffff888006682fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.226211][ T68] head: 0080000000000003 ffffea000019a001 ffffffffffffffff 0000000000000000 [ 11.226473][ T68] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 11.226729][ T68] page dumped because: kasan: bad access detected [ 11.226917][ T68] [ 11.226990][ T68] Memory state around the buggy address: [ 11.227134][ T68] ffff88800667ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 11.227355][ T68] ffff888006680000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 11.227579][ T68] >ffff888006680080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.227760][ T68] ^ [ 11.227959][ T68] ffff888006680100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.228151][ T68] ffff888006680180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.228333][ T68] ================================================================== [ 11.228626][ T68] Disabling lock debugging due to kernel taint