[ 10.231015][ T66] ================================================================== [ 10.231252][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.231444][ T66] Read of size 8 at addr ffff88800bfc00f8 by task kworker/u16:1/66 [ 10.231646][ T66] [ 10.231711][ T66] CPU: 2 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.231907][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.232077][ T66] Workqueue: netns cleanup_net [ 10.232241][ T66] Call Trace: [ 10.232359][ T66] [ 10.232429][ T66] dump_stack_lvl+0x82/0xd0 [ 10.232562][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 10.232724][ T66] ? cleanup_net+0x932/0xa40 [ 10.232848][ T66] print_report+0xb4/0x270 [ 10.232980][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 10.233119][ T66] kasan_report+0xbd/0xf0 [ 10.233226][ T66] ? cleanup_net+0x932/0xa40 [ 10.233369][ T66] cleanup_net+0x932/0xa40 [ 10.233492][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.233626][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 10.233753][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 10.233880][ T66] ? lock_acquire+0x32/0xc0 [ 10.234006][ T66] ? process_one_work+0xe0b/0x16d0 [ 10.234139][ T66] process_one_work+0xe55/0x16d0 [ 10.234278][ T66] ? __pfx___lock_release+0x10/0x10 [ 10.234421][ T66] ? __pfx_process_one_work+0x10/0x10 [ 10.234569][ T66] ? assign_work+0x16c/0x240 [ 10.234698][ T66] worker_thread+0x58c/0xce0 [ 10.234823][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.234978][ T66] ? __pfx_worker_thread+0x10/0x10 [ 10.235127][ T66] ? __pfx_worker_thread+0x10/0x10 [ 10.235252][ T66] kthread+0x28a/0x350 [ 10.235351][ T66] ? __pfx_kthread+0x10/0x10 [ 10.235486][ T66] ret_from_fork+0x31/0x70 [ 10.235626][ T66] ? __pfx_kthread+0x10/0x10 [ 10.235757][ T66] ret_from_fork_asm+0x1a/0x30 [ 10.235889][ T66] [ 10.235985][ T66] [ 10.236135][ T66] Allocated by task 227: [ 10.236237][ T66] kasan_save_stack+0x24/0x50 [ 10.236369][ T66] kasan_save_track+0x14/0x30 [ 10.236515][ T66] __kasan_slab_alloc+0x59/0x70 [ 10.236639][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.236771][ T66] copy_net_ns+0xc6/0x340 [ 10.236865][ T66] create_new_namespaces+0x35f/0x920 [ 10.236990][ T66] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.237112][ T66] ksys_unshare+0x2a9/0x660 [ 10.237258][ T66] __x64_sys_unshare+0x31/0x40 [ 10.237382][ T66] do_syscall_64+0xc1/0x1d0 [ 10.237506][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.237680][ T66] [ 10.237744][ T66] Freed by task 66: [ 10.237836][ T66] kasan_save_stack+0x24/0x50 [ 10.237962][ T66] kasan_save_track+0x14/0x30 [ 10.238110][ T66] kasan_save_free_info+0x3b/0x60 [ 10.238234][ T66] __kasan_slab_free+0x38/0x50 [ 10.238357][ T66] kmem_cache_free+0xf8/0x330 [ 10.238480][ T66] cleanup_net+0x5a8/0xa40 [ 10.238602][ T66] process_one_work+0xe55/0x16d0 [ 10.238746][ T66] worker_thread+0x58c/0xce0 [ 10.238870][ T66] kthread+0x28a/0x350 [ 10.238969][ T66] ret_from_fork+0x31/0x70 [ 10.239094][ T66] ret_from_fork_asm+0x1a/0x30 [ 10.239219][ T66] [ 10.239297][ T66] The buggy address belongs to the object at ffff88800bfc0040 [ 10.239297][ T66] which belongs to the cache net_namespace of size 5696 [ 10.239623][ T66] The buggy address is located 184 bytes inside of [ 10.239623][ T66] freed 5696-byte region [ffff88800bfc0040, ffff88800bfc1680) [ 10.239942][ T66] [ 10.240006][ T66] The buggy address belongs to the physical page: [ 10.240161][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800bfc2fc0 pfn:0xbfc0 [ 10.240418][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.240611][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.240789][ T66] page_type: f5(slab) [ 10.240887][ T66] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.241123][ T66] raw: ffff88800bfc2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.241338][ T66] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.241579][ T66] head: ffff88800bfc2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.241791][ T66] head: 0080000000000003 ffffea00002ff001 ffffffffffffffff 0000000000000000 [ 10.242027][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.242267][ T66] page dumped because: kasan: bad access detected [ 10.242431][ T66] [ 10.242505][ T66] Memory state around the buggy address: [ 10.242624][ T66] ffff88800bfbff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.242823][ T66] ffff88800bfc0000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.242999][ T66] >ffff88800bfc0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.243181][ T66] ^ [ 10.243377][ T66] ffff88800bfc0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.243557][ T66] ffff88800bfc0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.243732][ T66] ================================================================== [ 10.243992][ T66] Disabling lock debugging due to kernel taint