[ 10.110576][ T253] ip (253) used greatest stack depth: 23856 bytes left [ 12.111283][ T66] ================================================================== [ 12.111511][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 12.111697][ T66] Read of size 8 at addr ffff888009cc1bf8 by task kworker/u16:1/66 [ 12.111876][ T66] [ 12.111943][ T66] CPU: 2 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 12.112132][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 12.112285][ T66] Workqueue: netns cleanup_net [ 12.112415][ T66] Call Trace: [ 12.112513][ T66] [ 12.112590][ T66] dump_stack_lvl+0x82/0xd0 [ 12.112723][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 12.112885][ T66] ? cleanup_net+0xa5d/0xb90 [ 12.113011][ T66] print_report+0xb4/0x270 [ 12.113137][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 12.113263][ T66] kasan_report+0xbd/0xf0 [ 12.113357][ T66] ? cleanup_net+0xa5d/0xb90 [ 12.113484][ T66] cleanup_net+0xa5d/0xb90 [ 12.113613][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 12.113742][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 12.113866][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 12.113997][ T66] ? lock_acquire+0x32/0xc0 [ 12.114125][ T66] ? process_one_work+0xe0b/0x16d0 [ 12.114255][ T66] process_one_work+0xe55/0x16d0 [ 12.114381][ T66] ? __pfx___lock_release+0x10/0x10 [ 12.114510][ T66] ? __pfx_process_one_work+0x10/0x10 [ 12.114639][ T66] ? assign_work+0x16c/0x240 [ 12.114766][ T66] worker_thread+0x58c/0xce0 [ 12.114891][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 12.115049][ T66] ? __pfx_worker_thread+0x10/0x10 [ 12.115178][ T66] ? __pfx_worker_thread+0x10/0x10 [ 12.115305][ T66] kthread+0x28a/0x350 [ 12.115402][ T66] ? __pfx_kthread+0x10/0x10 [ 12.115529][ T66] ret_from_fork+0x31/0x70 [ 12.115656][ T66] ? __pfx_kthread+0x10/0x10 [ 12.115782][ T66] ret_from_fork_asm+0x1a/0x30 [ 12.115923][ T66] [ 12.116018][ T66] [ 12.116085][ T66] Allocated by task 269: [ 12.116180][ T66] kasan_save_stack+0x24/0x50 [ 12.116311][ T66] kasan_save_track+0x14/0x30 [ 12.116434][ T66] __kasan_slab_alloc+0x59/0x70 [ 12.116560][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 12.116686][ T66] copy_net_ns+0xc6/0x540 [ 12.116782][ T66] create_new_namespaces+0x35f/0x920 [ 12.116911][ T66] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 12.117035][ T66] ksys_unshare+0x2c4/0x6e0 [ 12.117164][ T66] __x64_sys_unshare+0x31/0x40 [ 12.117290][ T66] do_syscall_64+0xc1/0x1d0 [ 12.117417][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.117574][ T66] [ 12.117644][ T66] Freed by task 66: [ 12.117740][ T66] kasan_save_stack+0x24/0x50 [ 12.117866][ T66] kasan_save_track+0x14/0x30 [ 12.117990][ T66] kasan_save_free_info+0x3b/0x60 [ 12.118117][ T66] __kasan_slab_free+0x38/0x50 [ 12.118238][ T66] kmem_cache_free+0xf8/0x330 [ 12.118360][ T66] cleanup_net+0x5a8/0xb90 [ 12.118483][ T66] process_one_work+0xe55/0x16d0 [ 12.118605][ T66] worker_thread+0x58c/0xce0 [ 12.118729][ T66] kthread+0x28a/0x350 [ 12.118825][ T66] ret_from_fork+0x31/0x70 [ 12.118951][ T66] ret_from_fork_asm+0x1a/0x30 [ 12.119074][ T66] [ 12.119141][ T66] The buggy address belongs to the object at ffff888009cc1b40 [ 12.119141][ T66] which belongs to the cache net_namespace of size 6528 [ 12.119469][ T66] The buggy address is located 184 bytes inside of [ 12.119469][ T66] freed 6528-byte region [ffff888009cc1b40, ffff888009cc34c0) [ 12.119767][ T66] [ 12.119833][ T66] The buggy address belongs to the physical page: [ 12.119983][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888009cc3640 pfn:0x9cc0 [ 12.120240][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 12.120433][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 12.120595][ T66] page_type: f5(slab) [ 12.120696][ T66] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 12.120929][ T66] raw: ffff888009cc3640 0000000000040002 00000001f5000000 0000000000000000 [ 12.121149][ T66] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 12.121370][ T66] head: ffff888009cc3640 0000000000040002 00000001f5000000 0000000000000000 [ 12.121588][ T66] head: 0080000000000003 ffffea0000273001 ffffffffffffffff 0000000000000000 [ 12.121806][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 12.122030][ T66] page dumped because: kasan: bad access detected [ 12.122189][ T66] [ 12.122253][ T66] Memory state around the buggy address: [ 12.122377][ T66] ffff888009cc1a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.122570][ T66] ffff888009cc1b00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 12.122750][ T66] >ffff888009cc1b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.122930][ T66] ^ [ 12.123106][ T66] ffff888009cc1c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.123282][ T66] ffff888009cc1c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.123458][ T66] ================================================================== [ 12.123696][ T66] Disabling lock debugging due to kernel taint