[ 10.286934][ T68] ================================================================== [ 10.287229][ T68] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.287444][ T68] Read of size 8 at addr ffff888009aa00f8 by task kworker/u16:1/68 [ 10.287740][ T68] [ 10.287839][ T68] CPU: 3 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.288049][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.288203][ T68] Workqueue: netns cleanup_net [ 10.288338][ T68] Call Trace: [ 10.288463][ T68] [ 10.288553][ T68] dump_stack_lvl+0x82/0xd0 [ 10.288699][ T68] print_address_description.constprop.0+0x2c/0x3b0 [ 10.288878][ T68] ? cleanup_net+0x932/0xa40 [ 10.289019][ T68] print_report+0xb4/0x270 [ 10.289157][ T68] ? kasan_addr_to_slab+0x25/0x80 [ 10.289293][ T68] kasan_report+0xbd/0xf0 [ 10.289400][ T68] ? cleanup_net+0x932/0xa40 [ 10.289553][ T68] cleanup_net+0x932/0xa40 [ 10.289694][ T68] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.289833][ T68] ? __pfx_cleanup_net+0x10/0x10 [ 10.289971][ T68] ? trace_lock_acquire+0x148/0x1f0 [ 10.290151][ T68] ? lock_acquire+0x32/0xc0 [ 10.290287][ T68] ? process_one_work+0xe0b/0x16d0 [ 10.290425][ T68] process_one_work+0xe55/0x16d0 [ 10.290577][ T68] ? __pfx___lock_release+0x10/0x10 [ 10.290713][ T68] ? __pfx_process_one_work+0x10/0x10 [ 10.290848][ T68] ? assign_work+0x16c/0x240 [ 10.290986][ T68] worker_thread+0x58c/0xce0 [ 10.291158][ T68] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.291347][ T68] ? __pfx_worker_thread+0x10/0x10 [ 10.291484][ T68] ? __pfx_worker_thread+0x10/0x10 [ 10.291684][ T68] kthread+0x28a/0x350 [ 10.291802][ T68] ? __pfx_kthread+0x10/0x10 [ 10.291941][ T68] ret_from_fork+0x31/0x70 [ 10.292079][ T68] ? __pfx_kthread+0x10/0x10 [ 10.292241][ T68] ret_from_fork_asm+0x1a/0x30 [ 10.292413][ T68] [ 10.292529][ T68] [ 10.292602][ T68] Allocated by task 226: [ 10.292706][ T68] kasan_save_stack+0x24/0x50 [ 10.292844][ T68] kasan_save_track+0x14/0x30 [ 10.293006][ T68] __kasan_slab_alloc+0x59/0x70 [ 10.293179][ T68] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.293315][ T68] copy_net_ns+0xc6/0x340 [ 10.293456][ T68] create_new_namespaces+0x35f/0x920 [ 10.293624][ T68] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.293762][ T68] ksys_unshare+0x2a9/0x660 [ 10.293902][ T68] __x64_sys_unshare+0x31/0x40 [ 10.294072][ T68] do_syscall_64+0xc1/0x1d0 [ 10.294213][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.294457][ T68] [ 10.294542][ T68] Freed by task 68: [ 10.294637][ T68] kasan_save_stack+0x24/0x50 [ 10.294765][ T68] kasan_save_track+0x14/0x30 [ 10.294890][ T68] kasan_save_free_info+0x3b/0x60 [ 10.295014][ T68] __kasan_slab_free+0x38/0x50 [ 10.295135][ T68] kmem_cache_free+0xf8/0x330 [ 10.295296][ T68] cleanup_net+0x5a8/0xa40 [ 10.295426][ T68] process_one_work+0xe55/0x16d0 [ 10.295578][ T68] worker_thread+0x58c/0xce0 [ 10.295737][ T68] kthread+0x28a/0x350 [ 10.295853][ T68] ret_from_fork+0x31/0x70 [ 10.295981][ T68] ret_from_fork_asm+0x1a/0x30 [ 10.296141][ T68] [ 10.296204][ T68] The buggy address belongs to the object at ffff888009aa0040 [ 10.296204][ T68] which belongs to the cache net_namespace of size 5696 [ 10.296631][ T68] The buggy address is located 184 bytes inside of [ 10.296631][ T68] freed 5696-byte region [ffff888009aa0040, ffff888009aa1680) [ 10.297013][ T68] [ 10.297110][ T68] The buggy address belongs to the physical page: [ 10.297273][ T68] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888009aa2fc0 pfn:0x9aa0 [ 10.297531][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.297717][ T68] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.297907][ T68] page_type: f5(slab) [ 10.298014][ T68] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.298289][ T68] raw: ffff888009aa2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.298575][ T68] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.298853][ T68] head: ffff888009aa2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.299159][ T68] head: 0080000000000003 ffffea000026a801 ffffffffffffffff 0000000000000000 [ 10.299489][ T68] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.299828][ T68] page dumped because: kasan: bad access detected [ 10.300061][ T68] [ 10.300155][ T68] Memory state around the buggy address: [ 10.300338][ T68] ffff888009a9ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.300613][ T68] ffff888009aa0000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.300881][ T68] >ffff888009aa0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.301159][ T68] ^ [ 10.301427][ T68] ffff888009aa0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.301696][ T68] ffff888009aa0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.301911][ T68] ================================================================== [ 10.302113][ T68] Disabling lock debugging due to kernel taint [ 12.956397][ T226] seq-ext_ipv6 (226) used greatest stack depth: 23664 bytes left