[ 10.694864][ T66] ================================================================== [ 10.695093][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.695285][ T66] Read of size 8 at addr ffff888004e380f8 by task kworker/u16:1/66 [ 10.695468][ T66] [ 10.695541][ T66] CPU: 1 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.695762][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.695938][ T66] Workqueue: netns cleanup_net [ 10.696088][ T66] Call Trace: [ 10.696200][ T66] [ 10.696273][ T66] dump_stack_lvl+0x82/0xd0 [ 10.696416][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 10.696577][ T66] ? cleanup_net+0x932/0xa40 [ 10.696722][ T66] print_report+0xb4/0x270 [ 10.696849][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 10.696976][ T66] kasan_report+0xbd/0xf0 [ 10.697073][ T66] ? cleanup_net+0x932/0xa40 [ 10.697204][ T66] cleanup_net+0x932/0xa40 [ 10.697334][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.697464][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 10.697593][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 10.697729][ T66] ? lock_acquire+0x32/0xc0 [ 10.697857][ T66] ? process_one_work+0xe0b/0x16d0 [ 10.697988][ T66] process_one_work+0xe55/0x16d0 [ 10.698113][ T66] ? __pfx___lock_release+0x10/0x10 [ 10.698238][ T66] ? __pfx_process_one_work+0x10/0x10 [ 10.698364][ T66] ? assign_work+0x16c/0x240 [ 10.698492][ T66] worker_thread+0x58c/0xce0 [ 10.698624][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.698779][ T66] ? __pfx_worker_thread+0x10/0x10 [ 10.698901][ T66] ? __pfx_worker_thread+0x10/0x10 [ 10.699026][ T66] kthread+0x28a/0x350 [ 10.699126][ T66] ? __pfx_kthread+0x10/0x10 [ 10.699252][ T66] ret_from_fork+0x31/0x70 [ 10.699378][ T66] ? __pfx_kthread+0x10/0x10 [ 10.699509][ T66] ret_from_fork_asm+0x1a/0x30 [ 10.699674][ T66] [ 10.699783][ T66] [ 10.699854][ T66] Allocated by task 226: [ 10.699957][ T66] kasan_save_stack+0x24/0x50 [ 10.700116][ T66] kasan_save_track+0x14/0x30 [ 10.700257][ T66] __kasan_slab_alloc+0x59/0x70 [ 10.700382][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.700511][ T66] copy_net_ns+0xc6/0x340 [ 10.700611][ T66] create_new_namespaces+0x35f/0x920 [ 10.700737][ T66] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.700860][ T66] ksys_unshare+0x2a9/0x660 [ 10.700988][ T66] __x64_sys_unshare+0x31/0x40 [ 10.701114][ T66] do_syscall_64+0xc1/0x1d0 [ 10.701251][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.701408][ T66] [ 10.701472][ T66] Freed by task 66: [ 10.701568][ T66] kasan_save_stack+0x24/0x50 [ 10.701702][ T66] kasan_save_track+0x14/0x30 [ 10.701824][ T66] kasan_save_free_info+0x3b/0x60 [ 10.701950][ T66] __kasan_slab_free+0x38/0x50 [ 10.702069][ T66] kmem_cache_free+0xf8/0x330 [ 10.702193][ T66] cleanup_net+0x5a8/0xa40 [ 10.702321][ T66] process_one_work+0xe55/0x16d0 [ 10.702444][ T66] worker_thread+0x58c/0xce0 [ 10.702570][ T66] kthread+0x28a/0x350 [ 10.702676][ T66] ret_from_fork+0x31/0x70 [ 10.702803][ T66] ret_from_fork_asm+0x1a/0x30 [ 10.702928][ T66] [ 10.702992][ T66] The buggy address belongs to the object at ffff888004e38040 [ 10.702992][ T66] which belongs to the cache net_namespace of size 5696 [ 10.703381][ T66] The buggy address is located 184 bytes inside of [ 10.703381][ T66] freed 5696-byte region [ffff888004e38040, ffff888004e39680) [ 10.703697][ T66] [ 10.703763][ T66] The buggy address belongs to the physical page: [ 10.703917][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888004e3afc0 pfn:0x4e38 [ 10.704175][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.704367][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.704529][ T66] page_type: f5(slab) [ 10.704638][ T66] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.704863][ T66] raw: ffff888004e3afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.705103][ T66] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.705329][ T66] head: ffff888004e3afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.705565][ T66] head: 0080000000000003 ffffea0000138e01 ffffffffffffffff 0000000000000000 [ 10.705796][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.706013][ T66] page dumped because: kasan: bad access detected [ 10.706172][ T66] [ 10.706236][ T66] Memory state around the buggy address: [ 10.706356][ T66] ffff888004e37f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.706534][ T66] ffff888004e38000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.706730][ T66] >ffff888004e38080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.706931][ T66] ^ [ 10.707108][ T66] ffff888004e38100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.707288][ T66] ffff888004e38180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.707463][ T66] ================================================================== [ 10.707739][ T66] Disabling lock debugging due to kernel taint