[ 27.380864][ T11] ================================================================== [ 27.381113][ T11] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 27.381308][ T11] Read of size 8 at addr ffff8880140a80f8 by task kworker/u16:0/11 [ 27.381489][ T11] [ 27.381557][ T11] CPU: 1 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.12.0-virtme #1 [ 27.381751][ T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 27.381908][ T11] Workqueue: netns cleanup_net [ 27.382042][ T11] Call Trace: [ 27.382141][ T11] [ 27.382208][ T11] dump_stack_lvl+0x82/0xd0 [ 27.382344][ T11] print_address_description.constprop.0+0x2c/0x3b0 [ 27.382503][ T11] ? cleanup_net+0xa5d/0xb90 [ 27.382631][ T11] print_report+0xb4/0x270 [ 27.382761][ T11] ? kasan_addr_to_slab+0x25/0x80 [ 27.382887][ T11] kasan_report+0xbd/0xf0 [ 27.382982][ T11] ? cleanup_net+0xa5d/0xb90 [ 27.383109][ T11] cleanup_net+0xa5d/0xb90 [ 27.383230][ T11] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 27.383359][ T11] ? __pfx_cleanup_net+0x10/0x10 [ 27.383485][ T11] ? trace_lock_acquire+0x148/0x1f0 [ 27.383611][ T11] ? lock_acquire+0x32/0xc0 [ 27.383734][ T11] ? process_one_work+0xe0b/0x16d0 [ 27.383862][ T11] process_one_work+0xe55/0x16d0 [ 27.383988][ T11] ? __pfx___lock_release+0x10/0x10 [ 27.384112][ T11] ? __pfx_process_one_work+0x10/0x10 [ 27.384237][ T11] ? assign_work+0x16c/0x240 [ 27.384361][ T11] worker_thread+0x58c/0xce0 [ 27.384490][ T11] ? __pfx_worker_thread+0x10/0x10 [ 27.384623][ T11] kthread+0x28a/0x350 [ 27.384721][ T11] ? __pfx_kthread+0x10/0x10 [ 27.384846][ T11] ret_from_fork+0x31/0x70 [ 27.384972][ T11] ? __pfx_kthread+0x10/0x10 [ 27.385096][ T11] ret_from_fork_asm+0x1a/0x30 [ 27.385224][ T11] [ 27.385321][ T11] [ 27.385385][ T11] Allocated by task 258: [ 27.385482][ T11] kasan_save_stack+0x24/0x50 [ 27.385611][ T11] kasan_save_track+0x14/0x30 [ 27.385735][ T11] __kasan_slab_alloc+0x59/0x70 [ 27.385870][ T11] kmem_cache_alloc_noprof+0x10b/0x350 [ 27.385993][ T11] copy_net_ns+0xc6/0x540 [ 27.386083][ T11] create_new_namespaces+0x35f/0x920 [ 27.386206][ T11] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 27.386327][ T11] ksys_unshare+0x2c4/0x6e0 [ 27.386454][ T11] __x64_sys_unshare+0x31/0x40 [ 27.386576][ T11] do_syscall_64+0xc1/0x1d0 [ 27.386704][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 27.386873][ T11] [ 27.386937][ T11] Freed by task 11: [ 27.387030][ T11] kasan_save_stack+0x24/0x50 [ 27.387163][ T11] kasan_save_track+0x14/0x30 [ 27.387288][ T11] kasan_save_free_info+0x3b/0x60 [ 27.387423][ T11] __kasan_slab_free+0x38/0x50 [ 27.387545][ T11] kmem_cache_free+0xf8/0x330 [ 27.387666][ T11] cleanup_net+0x5a8/0xb90 [ 27.387785][ T11] process_one_work+0xe55/0x16d0 [ 27.387905][ T11] worker_thread+0x58c/0xce0 [ 27.388023][ T11] kthread+0x28a/0x350 [ 27.388114][ T11] ret_from_fork+0x31/0x70 [ 27.388237][ T11] ret_from_fork_asm+0x1a/0x30 [ 27.388357][ T11] [ 27.388419][ T11] The buggy address belongs to the object at ffff8880140a8040 [ 27.388419][ T11] which belongs to the cache net_namespace of size 6528 [ 27.388736][ T11] The buggy address is located 184 bytes inside of [ 27.388736][ T11] freed 6528-byte region [ffff8880140a8040, ffff8880140a99c0) [ 27.389026][ T11] [ 27.389089][ T11] The buggy address belongs to the physical page: [ 27.389236][ T11] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x140a8 [ 27.389461][ T11] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 27.389646][ T11] flags: 0x80000000000040(head|node=0|zone=1) [ 27.389800][ T11] page_type: f5(slab) [ 27.389899][ T11] raw: 0080000000000040 ffff888001975240 ffff88800197a0a8 ffff88800197a0a8 [ 27.390117][ T11] raw: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000 [ 27.390331][ T11] head: 0080000000000040 ffff888001975240 ffff88800197a0a8 ffff88800197a0a8 [ 27.390547][ T11] head: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000 [ 27.390763][ T11] head: 0080000000000003 ffffea0000502a01 ffffffffffffffff 0000000000000000 [ 27.390977][ T11] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 27.391193][ T11] page dumped because: kasan: bad access detected [ 27.391345][ T11] [ 27.391406][ T11] Memory state around the buggy address: [ 27.391526][ T11] ffff8880140a7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.391705][ T11] ffff8880140a8000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 27.391899][ T11] >ffff8880140a8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.392080][ T11] ^ [ 27.392259][ T11] ffff8880140a8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.392441][ T11] ffff8880140a8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.392626][ T11] ================================================================== [ 27.392824][ T11] Disabling lock debugging due to kernel taint