[ 10.849296][ T68] ================================================================== [ 10.849567][ T68] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.849790][ T68] Read of size 8 at addr ffff88800b9080f8 by task kworker/u16:1/68 [ 10.849994][ T68] [ 10.850073][ T68] CPU: 1 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.850292][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.850474][ T68] Workqueue: netns cleanup_net [ 10.850632][ T68] Call Trace: [ 10.850741][ T68] [ 10.850820][ T68] dump_stack_lvl+0x82/0xd0 [ 10.850973][ T68] print_address_description.constprop.0+0x2c/0x3b0 [ 10.851171][ T68] ? cleanup_net+0x932/0xa40 [ 10.851320][ T68] print_report+0xb4/0x270 [ 10.851474][ T68] ? kasan_addr_to_slab+0x25/0x80 [ 10.851622][ T68] kasan_report+0xbd/0xf0 [ 10.851733][ T68] ? cleanup_net+0x932/0xa40 [ 10.851874][ T68] cleanup_net+0x932/0xa40 [ 10.852019][ T68] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.852164][ T68] ? __pfx_cleanup_net+0x10/0x10 [ 10.852313][ T68] ? trace_lock_acquire+0x148/0x1f0 [ 10.852461][ T68] ? lock_acquire+0x32/0xc0 [ 10.852606][ T68] ? process_one_work+0xe0b/0x16d0 [ 10.852751][ T68] process_one_work+0xe55/0x16d0 [ 10.852899][ T68] ? __pfx___lock_release+0x10/0x10 [ 10.853052][ T68] ? __pfx_process_one_work+0x10/0x10 [ 10.853197][ T68] ? assign_work+0x16c/0x240 [ 10.853343][ T68] worker_thread+0x58c/0xce0 [ 10.853488][ T68] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.853672][ T68] ? __pfx_worker_thread+0x10/0x10 [ 10.853814][ T68] ? __pfx_worker_thread+0x10/0x10 [ 10.853957][ T68] kthread+0x28a/0x350 [ 10.854063][ T68] ? __pfx_kthread+0x10/0x10 [ 10.854215][ T68] ret_from_fork+0x31/0x70 [ 10.854355][ T68] ? __pfx_kthread+0x10/0x10 [ 10.854495][ T68] ret_from_fork_asm+0x1a/0x30 [ 10.854640][ T68] [ 10.854763][ T68] [ 10.854835][ T68] Allocated by task 227: [ 10.854942][ T68] kasan_save_stack+0x24/0x50 [ 10.855088][ T68] kasan_save_track+0x14/0x30 [ 10.855235][ T68] __kasan_slab_alloc+0x59/0x70 [ 10.855372][ T68] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.855520][ T68] copy_net_ns+0xc6/0x340 [ 10.855624][ T68] create_new_namespaces+0x35f/0x920 [ 10.855766][ T68] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.855909][ T68] ksys_unshare+0x2a9/0x660 [ 10.856052][ T68] __x64_sys_unshare+0x31/0x40 [ 10.856195][ T68] do_syscall_64+0xc1/0x1d0 [ 10.856336][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.856509][ T68] [ 10.856585][ T68] Freed by task 68: [ 10.856694][ T68] kasan_save_stack+0x24/0x50 [ 10.856838][ T68] kasan_save_track+0x14/0x30 [ 10.856985][ T68] kasan_save_free_info+0x3b/0x60 [ 10.857122][ T68] __kasan_slab_free+0x38/0x50 [ 10.857274][ T68] kmem_cache_free+0xf8/0x330 [ 10.857413][ T68] cleanup_net+0x5a8/0xa40 [ 10.857550][ T68] process_one_work+0xe55/0x16d0 [ 10.857694][ T68] worker_thread+0x58c/0xce0 [ 10.857830][ T68] kthread+0x28a/0x350 [ 10.857937][ T68] ret_from_fork+0x31/0x70 [ 10.858087][ T68] ret_from_fork_asm+0x1a/0x30 [ 10.858229][ T68] [ 10.858301][ T68] The buggy address belongs to the object at ffff88800b908040 [ 10.858301][ T68] which belongs to the cache net_namespace of size 5696 [ 10.858670][ T68] The buggy address is located 184 bytes inside of [ 10.858670][ T68] freed 5696-byte region [ffff88800b908040, ffff88800b909680) [ 10.859009][ T68] [ 10.859079][ T68] The buggy address belongs to the physical page: [ 10.859246][ T68] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800b90afc0 pfn:0xb908 [ 10.859524][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.859738][ T68] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.859923][ T68] page_type: f5(slab) [ 10.860036][ T68] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.860280][ T68] raw: ffff88800b90afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.860519][ T68] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.860766][ T68] head: ffff88800b90afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.861019][ T68] head: 0080000000000003 ffffea00002e4201 ffffffffffffffff 0000000000000000 [ 10.861277][ T68] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.861548][ T68] page dumped because: kasan: bad access detected [ 10.861729][ T68] [ 10.861807][ T68] Memory state around the buggy address: [ 10.861946][ T68] ffff88800b907f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 10.862167][ T68] ffff88800b908000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.862379][ T68] >ffff88800b908080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.862586][ T68] ^ [ 10.862790][ T68] ffff88800b908100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.863000][ T68] ffff88800b908180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.863209][ T68] ================================================================== [ 10.863497][ T68] Disabling lock debugging due to kernel taint [ 11.814966][ T227] setsockopt-clos (227) used greatest stack depth: 23968 bytes left