[ 11.746373][ T66] ================================================================== [ 11.746806][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 11.747126][ T66] Read of size 8 at addr ffff888004ee80f8 by task kworker/u16:1/66 [ 11.747466][ T66] [ 11.747577][ T66] CPU: 1 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 11.747924][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.748192][ T66] Workqueue: netns cleanup_net [ 11.748428][ T66] Call Trace: [ 11.748648][ T66] [ 11.748766][ T66] dump_stack_lvl+0x82/0xd0 [ 11.748987][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 11.749277][ T66] ? cleanup_net+0x932/0xa40 [ 11.749495][ T66] print_report+0xb4/0x270 [ 11.749711][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 11.749946][ T66] kasan_report+0xbd/0xf0 [ 11.750109][ T66] ? cleanup_net+0x932/0xa40 [ 11.750316][ T66] cleanup_net+0x932/0xa40 [ 11.750521][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 11.750739][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 11.750950][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 11.751161][ T66] ? lock_acquire+0x32/0xc0 [ 11.751371][ T66] ? process_one_work+0xe0b/0x16d0 [ 11.751585][ T66] process_one_work+0xe55/0x16d0 [ 11.751833][ T66] ? __pfx___lock_release+0x10/0x10 [ 11.752051][ T66] ? __pfx_process_one_work+0x10/0x10 [ 11.752267][ T66] ? assign_work+0x16c/0x240 [ 11.752474][ T66] worker_thread+0x58c/0xce0 [ 11.752690][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 11.752970][ T66] ? __pfx_worker_thread+0x10/0x10 [ 11.753191][ T66] ? __pfx_worker_thread+0x10/0x10 [ 11.753419][ T66] kthread+0x28a/0x350 [ 11.753583][ T66] ? __pfx_kthread+0x10/0x10 [ 11.753796][ T66] ret_from_fork+0x31/0x70 [ 11.754007][ T66] ? __pfx_kthread+0x10/0x10 [ 11.754222][ T66] ret_from_fork_asm+0x1a/0x30 [ 11.754439][ T66] [ 11.754602][ T66] [ 11.754708][ T66] Allocated by task 227: [ 11.754861][ T66] kasan_save_stack+0x24/0x50 [ 11.755077][ T66] kasan_save_track+0x14/0x30 [ 11.755283][ T66] __kasan_slab_alloc+0x59/0x70 [ 11.755494][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 11.755705][ T66] copy_net_ns+0xc6/0x340 [ 11.755868][ T66] create_new_namespaces+0x35f/0x920 [ 11.756079][ T66] unshare_nsproxy_namespaces+0x8d/0x130 [ 11.756290][ T66] ksys_unshare+0x2a9/0x660 [ 11.756498][ T66] __x64_sys_unshare+0x31/0x40 [ 11.756704][ T66] do_syscall_64+0xc1/0x1d0 [ 11.756913][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 11.757176][ T66] [ 11.757280][ T66] Freed by task 66: [ 11.757436][ T66] kasan_save_stack+0x24/0x50 [ 11.757677][ T66] kasan_save_track+0x14/0x30 [ 11.757974][ T66] kasan_save_free_info+0x3b/0x60 [ 11.758192][ T66] __kasan_slab_free+0x38/0x50 [ 11.758404][ T66] kmem_cache_free+0xf8/0x330 [ 11.758618][ T66] cleanup_net+0x5a8/0xa40 [ 11.758834][ T66] process_one_work+0xe55/0x16d0 [ 11.759046][ T66] worker_thread+0x58c/0xce0 [ 11.759274][ T66] kthread+0x28a/0x350 [ 11.759437][ T66] ret_from_fork+0x31/0x70 [ 11.759648][ T66] ret_from_fork_asm+0x1a/0x30 [ 11.759866][ T66] [ 11.759974][ T66] The buggy address belongs to the object at ffff888004ee8040 [ 11.759974][ T66] which belongs to the cache net_namespace of size 5696 [ 11.760554][ T66] The buggy address is located 184 bytes inside of [ 11.760554][ T66] freed 5696-byte region [ffff888004ee8040, ffff888004ee9680) [ 11.761083][ T66] [ 11.761189][ T66] The buggy address belongs to the physical page: [ 11.761439][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888004eeafc0 pfn:0x4ee8 [ 11.761880][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 11.762222][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 11.762495][ T66] page_type: f5(slab) [ 11.762661][ T66] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.763043][ T66] raw: ffff888004eeafc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.763418][ T66] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.763789][ T66] head: ffff888004eeafc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.764150][ T66] head: 0080000000000003 ffffea000013ba01 ffffffffffffffff 0000000000000000 [ 11.764520][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 11.764882][ T66] page dumped because: kasan: bad access detected [ 11.765132][ T66] [ 11.765236][ T66] Memory state around the buggy address: [ 11.765442][ T66] ffff888004ee7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.765750][ T66] ffff888004ee8000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 11.766064][ T66] >ffff888004ee8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.766366][ T66] ^ [ 11.766644][ T66] ffff888004ee8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.766936][ T66] ffff888004ee8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.767228][ T66] ================================================================== [ 11.767625][ T66] Disabling lock debugging due to kernel taint