[ 10.949008][ T67] ================================================================== [ 10.949270][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.949491][ T67] Read of size 8 at addr ffff88800a2480f8 by task kworker/u16:1/67 [ 10.949732][ T67] [ 10.949829][ T67] CPU: 0 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.950089][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.950258][ T67] Workqueue: netns cleanup_net [ 10.950400][ T67] Call Trace: [ 10.950496][ T67] [ 10.950565][ T67] dump_stack_lvl+0x82/0xd0 [ 10.950699][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 10.950858][ T67] ? cleanup_net+0x932/0xa40 [ 10.950994][ T67] print_report+0xb4/0x270 [ 10.951119][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 10.951242][ T67] kasan_report+0xbd/0xf0 [ 10.951337][ T67] ? cleanup_net+0x932/0xa40 [ 10.951463][ T67] cleanup_net+0x932/0xa40 [ 10.951595][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.951724][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 10.951848][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 10.951975][ T67] ? lock_acquire+0x32/0xc0 [ 10.952103][ T67] ? process_one_work+0xe0b/0x16d0 [ 10.952236][ T67] process_one_work+0xe55/0x16d0 [ 10.952374][ T67] ? __pfx___lock_release+0x10/0x10 [ 10.952502][ T67] ? __pfx_process_one_work+0x10/0x10 [ 10.952631][ T67] ? assign_work+0x16c/0x240 [ 10.952758][ T67] worker_thread+0x58c/0xce0 [ 10.952899][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.953060][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.953202][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.953326][ T67] kthread+0x28a/0x350 [ 10.953422][ T67] ? __pfx_kthread+0x10/0x10 [ 10.953549][ T67] ret_from_fork+0x31/0x70 [ 10.953673][ T67] ? __pfx_kthread+0x10/0x10 [ 10.953797][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.953925][ T67] [ 10.954030][ T67] [ 10.954114][ T67] Allocated by task 227: [ 10.954209][ T67] kasan_save_stack+0x24/0x50 [ 10.954340][ T67] kasan_save_track+0x14/0x30 [ 10.954463][ T67] __kasan_slab_alloc+0x59/0x70 [ 10.954585][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.954712][ T67] copy_net_ns+0xc6/0x340 [ 10.954807][ T67] create_new_namespaces+0x35f/0x920 [ 10.954940][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.955065][ T67] ksys_unshare+0x2a9/0x660 [ 10.955194][ T67] __x64_sys_unshare+0x31/0x40 [ 10.955336][ T67] do_syscall_64+0xc1/0x1d0 [ 10.955461][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.955616][ T67] [ 10.955679][ T67] Freed by task 67: [ 10.955778][ T67] kasan_save_stack+0x24/0x50 [ 10.955911][ T67] kasan_save_track+0x14/0x30 [ 10.956038][ T67] kasan_save_free_info+0x3b/0x60 [ 10.956164][ T67] __kasan_slab_free+0x38/0x50 [ 10.956287][ T67] kmem_cache_free+0xf8/0x330 [ 10.956409][ T67] cleanup_net+0x5a8/0xa40 [ 10.956533][ T67] process_one_work+0xe55/0x16d0 [ 10.956685][ T67] worker_thread+0x58c/0xce0 [ 10.956817][ T67] kthread+0x28a/0x350 [ 10.956920][ T67] ret_from_fork+0x31/0x70 [ 10.957043][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.957167][ T67] [ 10.957231][ T67] The buggy address belongs to the object at ffff88800a248040 [ 10.957231][ T67] which belongs to the cache net_namespace of size 5696 [ 10.957556][ T67] The buggy address is located 184 bytes inside of [ 10.957556][ T67] freed 5696-byte region [ffff88800a248040, ffff88800a249680) [ 10.957857][ T67] [ 10.957920][ T67] The buggy address belongs to the physical page: [ 10.958069][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800a24afc0 pfn:0xa248 [ 10.958317][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.958511][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.958690][ T67] page_type: f5(slab) [ 10.958790][ T67] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.959011][ T67] raw: ffff88800a24afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.959248][ T67] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.959482][ T67] head: ffff88800a24afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.959706][ T67] head: 0080000000000003 ffffea0000289201 ffffffffffffffff 0000000000000000 [ 10.959931][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.960149][ T67] page dumped because: kasan: bad access detected [ 10.960298][ T67] [ 10.960365][ T67] Memory state around the buggy address: [ 10.960484][ T67] ffff88800a247f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.960676][ T67] ffff88800a248000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.960857][ T67] >ffff88800a248080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.961034][ T67] ^ [ 10.961215][ T67] ffff88800a248100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.961392][ T67] ffff88800a248180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.961574][ T67] ================================================================== [ 10.961795][ T67] Disabling lock debugging due to kernel taint