[ 10.767320][ T11] ================================================================== [ 10.767579][ T11] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.767796][ T11] Read of size 8 at addr ffff88800b6f80f8 by task kworker/u16:0/11 [ 10.768000][ T11] [ 10.768074][ T11] CPU: 0 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.12.0-virtme #1 [ 10.768283][ T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.768471][ T11] Workqueue: netns cleanup_net [ 10.768614][ T11] Call Trace: [ 10.768719][ T11] [ 10.768793][ T11] dump_stack_lvl+0x82/0xd0 [ 10.768938][ T11] print_address_description.constprop.0+0x2c/0x3b0 [ 10.769117][ T11] ? cleanup_net+0x932/0xa40 [ 10.769259][ T11] print_report+0xb4/0x270 [ 10.769402][ T11] ? kasan_addr_to_slab+0x25/0x80 [ 10.769544][ T11] kasan_report+0xbd/0xf0 [ 10.769650][ T11] ? cleanup_net+0x932/0xa40 [ 10.769787][ T11] cleanup_net+0x932/0xa40 [ 10.769924][ T11] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.770061][ T11] ? __pfx_cleanup_net+0x10/0x10 [ 10.770209][ T11] ? trace_lock_acquire+0x148/0x1f0 [ 10.770367][ T11] ? lock_acquire+0x32/0xc0 [ 10.770517][ T11] ? process_one_work+0xe0b/0x16d0 [ 10.770674][ T11] process_one_work+0xe55/0x16d0 [ 10.770834][ T11] ? __pfx___lock_release+0x10/0x10 [ 10.770990][ T11] ? __pfx_process_one_work+0x10/0x10 [ 10.771141][ T11] ? assign_work+0x16c/0x240 [ 10.771290][ T11] worker_thread+0x58c/0xce0 [ 10.771437][ T11] ? __pfx_worker_thread+0x10/0x10 [ 10.771591][ T11] kthread+0x28a/0x350 [ 10.771698][ T11] ? __pfx_kthread+0x10/0x10 [ 10.771851][ T11] ret_from_fork+0x31/0x70 [ 10.771997][ T11] ? __pfx_kthread+0x10/0x10 [ 10.772151][ T11] ret_from_fork_asm+0x1a/0x30 [ 10.772306][ T11] [ 10.772421][ T11] [ 10.772498][ T11] Allocated by task 227: [ 10.772613][ T11] kasan_save_stack+0x24/0x50 [ 10.772769][ T11] kasan_save_track+0x14/0x30 [ 10.772921][ T11] __kasan_slab_alloc+0x59/0x70 [ 10.773071][ T11] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.773225][ T11] copy_net_ns+0xc6/0x340 [ 10.773338][ T11] create_new_namespaces+0x35f/0x920 [ 10.773492][ T11] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.773641][ T11] ksys_unshare+0x2a9/0x660 [ 10.773795][ T11] __x64_sys_unshare+0x31/0x40 [ 10.773950][ T11] do_syscall_64+0xc1/0x1d0 [ 10.774101][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.774292][ T11] [ 10.774369][ T11] Freed by task 11: [ 10.774482][ T11] kasan_save_stack+0x24/0x50 [ 10.774638][ T11] kasan_save_track+0x14/0x30 [ 10.774788][ T11] kasan_save_free_info+0x3b/0x60 [ 10.774939][ T11] __kasan_slab_free+0x38/0x50 [ 10.775105][ T11] kmem_cache_free+0xf8/0x330 [ 10.775255][ T11] cleanup_net+0x5a8/0xa40 [ 10.775407][ T11] process_one_work+0xe55/0x16d0 [ 10.775569][ T11] worker_thread+0x58c/0xce0 [ 10.775723][ T11] kthread+0x28a/0x350 [ 10.775841][ T11] ret_from_fork+0x31/0x70 [ 10.775989][ T11] ret_from_fork_asm+0x1a/0x30 [ 10.776140][ T11] [ 10.776218][ T11] The buggy address belongs to the object at ffff88800b6f8040 [ 10.776218][ T11] which belongs to the cache net_namespace of size 5696 [ 10.776626][ T11] The buggy address is located 184 bytes inside of [ 10.776626][ T11] freed 5696-byte region [ffff88800b6f8040, ffff88800b6f9680) [ 10.776996][ T11] [ 10.777075][ T11] The buggy address belongs to the physical page: [ 10.777262][ T11] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800b6fafc0 pfn:0xb6f8 [ 10.777566][ T11] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.777808][ T11] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.778008][ T11] page_type: f5(slab) [ 10.778127][ T11] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.778396][ T11] raw: ffff88800b6fafc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.778666][ T11] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.778939][ T11] head: ffff88800b6fafc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.779205][ T11] head: 0080000000000003 ffffea00002dbe01 ffffffffffffffff 0000000000000000 [ 10.779470][ T11] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.779750][ T11] page dumped because: kasan: bad access detected [ 10.779945][ T11] [ 10.780020][ T11] Memory state around the buggy address: [ 10.780166][ T11] ffff88800b6f7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.780390][ T11] ffff88800b6f8000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.780612][ T11] >ffff88800b6f8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.780836][ T11] ^ [ 10.781055][ T11] ffff88800b6f8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.781275][ T11] ffff88800b6f8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.781493][ T11] ================================================================== [ 10.781750][ T11] Disabling lock debugging due to kernel taint