[ 11.213676][ T11] ================================================================== [ 11.214019][ T11] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 11.214339][ T11] Read of size 8 at addr ffff88800b3800f8 by task kworker/u16:0/11 [ 11.214623][ T11] [ 11.214727][ T11] CPU: 2 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.12.0-virtme #1 [ 11.215011][ T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.215258][ T11] Workqueue: netns cleanup_net [ 11.215456][ T11] Call Trace: [ 11.215601][ T11] [ 11.215704][ T11] dump_stack_lvl+0x82/0xd0 [ 11.215911][ T11] print_address_description.constprop.0+0x2c/0x3b0 [ 11.216194][ T11] ? cleanup_net+0x932/0xa40 [ 11.216391][ T11] print_report+0xb4/0x270 [ 11.216590][ T11] ? kasan_addr_to_slab+0x25/0x80 [ 11.216796][ T11] kasan_report+0xbd/0xf0 [ 11.216949][ T11] ? cleanup_net+0x932/0xa40 [ 11.217145][ T11] cleanup_net+0x932/0xa40 [ 11.217365][ T11] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 11.217577][ T11] ? __pfx_cleanup_net+0x10/0x10 [ 11.217781][ T11] ? trace_lock_acquire+0x148/0x1f0 [ 11.217985][ T11] ? lock_acquire+0x32/0xc0 [ 11.218192][ T11] ? process_one_work+0xe0b/0x16d0 [ 11.218400][ T11] process_one_work+0xe55/0x16d0 [ 11.218606][ T11] ? __pfx___lock_release+0x10/0x10 [ 11.218806][ T11] ? __pfx_process_one_work+0x10/0x10 [ 11.219014][ T11] ? assign_work+0x16c/0x240 [ 11.219218][ T11] worker_thread+0x58c/0xce0 [ 11.219423][ T11] ? __pfx_worker_thread+0x10/0x10 [ 11.219624][ T11] kthread+0x28a/0x350 [ 11.219784][ T11] ? __pfx_kthread+0x10/0x10 [ 11.219980][ T11] ret_from_fork+0x31/0x70 [ 11.220180][ T11] ? __pfx_kthread+0x10/0x10 [ 11.220374][ T11] ret_from_fork_asm+0x1a/0x30 [ 11.220572][ T11] [ 11.220715][ T11] [ 11.220806][ T11] Allocated by task 226: [ 11.220948][ T11] kasan_save_stack+0x24/0x50 [ 11.221148][ T11] kasan_save_track+0x14/0x30 [ 11.221340][ T11] __kasan_slab_alloc+0x59/0x70 [ 11.221541][ T11] kmem_cache_alloc_noprof+0x10b/0x350 [ 11.221744][ T11] copy_net_ns+0xc6/0x340 [ 11.221894][ T11] create_new_namespaces+0x35f/0x920 [ 11.222099][ T11] unshare_nsproxy_namespaces+0x8d/0x130 [ 11.222288][ T11] ksys_unshare+0x2a9/0x660 [ 11.222491][ T11] __x64_sys_unshare+0x31/0x40 [ 11.222691][ T11] do_syscall_64+0xc1/0x1d0 [ 11.222892][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 11.223148][ T11] [ 11.223253][ T11] Freed by task 11: [ 11.223406][ T11] kasan_save_stack+0x24/0x50 [ 11.223612][ T11] kasan_save_track+0x14/0x30 [ 11.223813][ T11] kasan_save_free_info+0x3b/0x60 [ 11.224036][ T11] __kasan_slab_free+0x38/0x50 [ 11.224242][ T11] kmem_cache_free+0xf8/0x330 [ 11.224442][ T11] cleanup_net+0x5a8/0xa40 [ 11.224648][ T11] process_one_work+0xe55/0x16d0 [ 11.224848][ T11] worker_thread+0x58c/0xce0 [ 11.225047][ T11] kthread+0x28a/0x350 [ 11.225198][ T11] ret_from_fork+0x31/0x70 [ 11.225396][ T11] ret_from_fork_asm+0x1a/0x30 [ 11.225591][ T11] [ 11.225689][ T11] The buggy address belongs to the object at ffff88800b380040 [ 11.225689][ T11] which belongs to the cache net_namespace of size 5696 [ 11.226181][ T11] The buggy address is located 184 bytes inside of [ 11.226181][ T11] freed 5696-byte region [ffff88800b380040, ffff88800b381680) [ 11.226647][ T11] [ 11.226749][ T11] The buggy address belongs to the physical page: [ 11.226996][ T11] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800b382fc0 pfn:0xb380 [ 11.227399][ T11] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 11.227703][ T11] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 11.227958][ T11] page_type: f5(slab) [ 11.228120][ T11] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.228487][ T11] raw: ffff88800b382fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.228845][ T11] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.229200][ T11] head: ffff88800b382fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.229519][ T11] head: 0080000000000003 ffffea00002ce001 ffffffffffffffff 0000000000000000 [ 11.229869][ T11] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 11.230215][ T11] page dumped because: kasan: bad access detected [ 11.230460][ T11] [ 11.230561][ T11] Memory state around the buggy address: [ 11.230756][ T11] ffff88800b37ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.231050][ T11] ffff88800b380000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 11.231338][ T11] >ffff88800b380080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.231629][ T11] ^ [ 11.231915][ T11] ffff88800b380100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.232215][ T11] ffff88800b380180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.232508][ T11] ================================================================== [ 11.232868][ T11] Disabling lock debugging due to kernel taint