[ 11.796110][ T287] ip (287) used greatest stack depth: 23776 bytes left [ 28.051873][ T68] ================================================================== [ 28.052120][ T68] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 28.052329][ T68] Read of size 8 at addr ffff888005a700f8 by task kworker/u16:1/68 [ 28.052536][ T68] [ 28.052610][ T68] CPU: 0 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 28.052814][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 28.052985][ T68] Workqueue: netns cleanup_net [ 28.053127][ T68] Call Trace: [ 28.053228][ T68] [ 28.053301][ T68] dump_stack_lvl+0x82/0xd0 [ 28.053444][ T68] print_address_description.constprop.0+0x2c/0x3b0 [ 28.053618][ T68] ? cleanup_net+0xa5d/0xb90 [ 28.053767][ T68] print_report+0xb4/0x270 [ 28.053905][ T68] ? kasan_addr_to_slab+0x25/0x80 [ 28.054042][ T68] kasan_report+0xbd/0xf0 [ 28.054147][ T68] ? cleanup_net+0xa5d/0xb90 [ 28.054285][ T68] cleanup_net+0xa5d/0xb90 [ 28.054415][ T68] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 28.054553][ T68] ? __pfx_cleanup_net+0x10/0x10 [ 28.054684][ T68] ? trace_lock_acquire+0x148/0x1f0 [ 28.054820][ T68] ? lock_acquire+0x32/0xc0 [ 28.054956][ T68] ? process_one_work+0xe0b/0x16d0 [ 28.055094][ T68] process_one_work+0xe55/0x16d0 [ 28.055234][ T68] ? __pfx___lock_release+0x10/0x10 [ 28.055372][ T68] ? __pfx_process_one_work+0x10/0x10 [ 28.055511][ T68] ? assign_work+0x16c/0x240 [ 28.055648][ T68] worker_thread+0x58c/0xce0 [ 28.055778][ T68] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 28.055954][ T68] ? __pfx_worker_thread+0x10/0x10 [ 28.056092][ T68] ? __pfx_worker_thread+0x10/0x10 [ 28.056230][ T68] kthread+0x28a/0x350 [ 28.056334][ T68] ? __pfx_kthread+0x10/0x10 [ 28.056463][ T68] ret_from_fork+0x31/0x70 [ 28.056600][ T68] ? __pfx_kthread+0x10/0x10 [ 28.056732][ T68] ret_from_fork_asm+0x1a/0x30 [ 28.056874][ T68] [ 28.056978][ T68] [ 28.057046][ T68] Allocated by task 259: [ 28.057145][ T68] kasan_save_stack+0x24/0x50 [ 28.057280][ T68] kasan_save_track+0x14/0x30 [ 28.057415][ T68] __kasan_slab_alloc+0x59/0x70 [ 28.057544][ T68] kmem_cache_alloc_noprof+0x10b/0x350 [ 28.057672][ T68] copy_net_ns+0xc6/0x540 [ 28.057771][ T68] create_new_namespaces+0x35f/0x920 [ 28.057902][ T68] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 28.058032][ T68] ksys_unshare+0x2c4/0x6e0 [ 28.058162][ T68] __x64_sys_unshare+0x31/0x40 [ 28.058292][ T68] do_syscall_64+0xc1/0x1d0 [ 28.058427][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 28.058596][ T68] [ 28.058665][ T68] Freed by task 68: [ 28.058764][ T68] kasan_save_stack+0x24/0x50 [ 28.058897][ T68] kasan_save_track+0x14/0x30 [ 28.059029][ T68] kasan_save_free_info+0x3b/0x60 [ 28.059161][ T68] __kasan_slab_free+0x38/0x50 [ 28.059296][ T68] kmem_cache_free+0xf8/0x330 [ 28.059429][ T68] cleanup_net+0x5a8/0xb90 [ 28.059563][ T68] process_one_work+0xe55/0x16d0 [ 28.059694][ T68] worker_thread+0x58c/0xce0 [ 28.059828][ T68] kthread+0x28a/0x350 [ 28.059929][ T68] ret_from_fork+0x31/0x70 [ 28.060062][ T68] ret_from_fork_asm+0x1a/0x30 [ 28.060194][ T68] [ 28.060259][ T68] The buggy address belongs to the object at ffff888005a70040 [ 28.060259][ T68] which belongs to the cache net_namespace of size 6528 [ 28.060610][ T68] The buggy address is located 184 bytes inside of [ 28.060610][ T68] freed 6528-byte region [ffff888005a70040, ffff888005a719c0) [ 28.060932][ T68] [ 28.061001][ T68] The buggy address belongs to the physical page: [ 28.061166][ T68] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5a70 [ 28.061402][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 28.061603][ T68] flags: 0x80000000000040(head|node=0|zone=1) [ 28.061770][ T68] page_type: f5(slab) [ 28.061873][ T68] raw: 0080000000000040 ffff888001975240 ffff88800197a0a8 ffff88800197a0a8 [ 28.062109][ T68] raw: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000 [ 28.062338][ T68] head: 0080000000000040 ffff888001975240 ffff88800197a0a8 ffff88800197a0a8 [ 28.062571][ T68] head: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000 [ 28.062804][ T68] head: 0080000000000003 ffffea0000169c01 ffffffffffffffff 0000000000000000 [ 28.063030][ T68] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 28.063263][ T68] page dumped because: kasan: bad access detected [ 28.063420][ T68] [ 28.063485][ T68] Memory state around the buggy address: [ 28.063614][ T68] ffff888005a6ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 28.063866][ T68] ffff888005a70000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 28.064171][ T68] >ffff888005a70080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.064360][ T68] ^ [ 28.064600][ T68] ffff888005a70100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.064789][ T68] ffff888005a70180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.065032][ T68] ================================================================== [ 28.065240][ T68] Disabling lock debugging due to kernel taint