[ 12.254186][ T66] ================================================================== [ 12.254439][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 12.254672][ T66] Read of size 8 at addr ffff88800b2300f8 by task kworker/u16:1/66 [ 12.254884][ T66] [ 12.254962][ T66] CPU: 0 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 12.255157][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 12.255335][ T66] Workqueue: netns cleanup_net [ 12.255493][ T66] Call Trace: [ 12.255594][ T66] [ 12.255670][ T66] dump_stack_lvl+0x82/0xd0 [ 12.255805][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 12.255970][ T66] ? cleanup_net+0x932/0xa40 [ 12.256099][ T66] print_report+0xb4/0x270 [ 12.256228][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 12.256363][ T66] kasan_report+0xbd/0xf0 [ 12.256473][ T66] ? cleanup_net+0x932/0xa40 [ 12.256649][ T66] cleanup_net+0x932/0xa40 [ 12.256853][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 12.256996][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 12.257143][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 12.257277][ T66] ? lock_acquire+0x32/0xc0 [ 12.257438][ T66] ? process_one_work+0xe0b/0x16d0 [ 12.257613][ T66] process_one_work+0xe55/0x16d0 [ 12.257843][ T66] ? __pfx___lock_release+0x10/0x10 [ 12.258130][ T66] ? __pfx_process_one_work+0x10/0x10 [ 12.258338][ T66] ? assign_work+0x16c/0x240 [ 12.258529][ T66] worker_thread+0x58c/0xce0 [ 12.258733][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 12.258974][ T66] ? __pfx_worker_thread+0x10/0x10 [ 12.259168][ T66] ? __pfx_worker_thread+0x10/0x10 [ 12.259368][ T66] kthread+0x28a/0x350 [ 12.259515][ T66] ? __pfx_kthread+0x10/0x10 [ 12.259706][ T66] ret_from_fork+0x31/0x70 [ 12.259910][ T66] ? __pfx_kthread+0x10/0x10 [ 12.260105][ T66] ret_from_fork_asm+0x1a/0x30 [ 12.260309][ T66] [ 12.260460][ T66] [ 12.260559][ T66] Allocated by task 227: [ 12.260708][ T66] kasan_save_stack+0x24/0x50 [ 12.260914][ T66] kasan_save_track+0x14/0x30 [ 12.261113][ T66] __kasan_slab_alloc+0x59/0x70 [ 12.261313][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 12.261517][ T66] copy_net_ns+0xc6/0x340 [ 12.261710][ T66] create_new_namespaces+0x35f/0x920 [ 12.261921][ T66] unshare_nsproxy_namespaces+0x8d/0x130 [ 12.262122][ T66] ksys_unshare+0x2a9/0x660 [ 12.262325][ T66] __x64_sys_unshare+0x31/0x40 [ 12.262528][ T66] do_syscall_64+0xc1/0x1d0 [ 12.262734][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.262984][ T66] [ 12.263096][ T66] Freed by task 66: [ 12.263248][ T66] kasan_save_stack+0x24/0x50 [ 12.263456][ T66] kasan_save_track+0x14/0x30 [ 12.263641][ T66] kasan_save_free_info+0x3b/0x60 [ 12.263784][ T66] __kasan_slab_free+0x38/0x50 [ 12.263950][ T66] kmem_cache_free+0xf8/0x330 [ 12.264171][ T66] cleanup_net+0x5a8/0xa40 [ 12.264312][ T66] process_one_work+0xe55/0x16d0 [ 12.264450][ T66] worker_thread+0x58c/0xce0 [ 12.264592][ T66] kthread+0x28a/0x350 [ 12.264717][ T66] ret_from_fork+0x31/0x70 [ 12.264847][ T66] ret_from_fork_asm+0x1a/0x30 [ 12.264983][ T66] [ 12.265060][ T66] The buggy address belongs to the object at ffff88800b230040 [ 12.265060][ T66] which belongs to the cache net_namespace of size 5696 [ 12.265397][ T66] The buggy address is located 184 bytes inside of [ 12.265397][ T66] freed 5696-byte region [ffff88800b230040, ffff88800b231680) [ 12.265813][ T66] [ 12.265917][ T66] The buggy address belongs to the physical page: [ 12.266152][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800b232fc0 pfn:0xb230 [ 12.266447][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 12.266691][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 12.266869][ T66] page_type: f5(slab) [ 12.266990][ T66] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 12.267254][ T66] raw: ffff88800b232fc0 0000000000050002 00000001f5000000 0000000000000000 [ 12.267531][ T66] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 12.267808][ T66] head: ffff88800b232fc0 0000000000050002 00000001f5000000 0000000000000000 [ 12.268036][ T66] head: 0080000000000003 ffffea00002c8c01 ffffffffffffffff 0000000000000000 [ 12.268271][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 12.268497][ T66] page dumped because: kasan: bad access detected [ 12.268667][ T66] [ 12.268753][ T66] Memory state around the buggy address: [ 12.268911][ T66] ffff88800b22ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 12.269169][ T66] ffff88800b230000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 12.269417][ T66] >ffff88800b230080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.269620][ T66] ^ [ 12.269819][ T66] ffff88800b230100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.270001][ T66] ffff88800b230180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.270183][ T66] ================================================================== [ 12.270404][ T66] Disabling lock debugging due to kernel taint [ 16.728815][ C2] TCP: TCP-AO: the keyid 100 from SYN packet is not present - not sending SYNACK