[ 11.993785][ T66] ================================================================== [ 11.994163][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 11.994491][ T66] Read of size 8 at addr ffff88800b7b00f8 by task kworker/u16:1/66 [ 11.994787][ T66] [ 11.994898][ T66] CPU: 1 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 11.995212][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.995449][ T66] Workqueue: netns cleanup_net [ 11.995677][ T66] Call Trace: [ 11.995836][ T66] [ 11.995946][ T66] dump_stack_lvl+0x82/0xd0 [ 11.996173][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 11.996439][ T66] ? cleanup_net+0x932/0xa40 [ 11.996652][ T66] print_report+0xb4/0x270 [ 11.996865][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 11.997093][ T66] kasan_report+0xbd/0xf0 [ 11.997261][ T66] ? cleanup_net+0x932/0xa40 [ 11.997480][ T66] cleanup_net+0x932/0xa40 [ 11.997688][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 11.997891][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 11.998098][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 11.998301][ T66] ? lock_acquire+0x32/0xc0 [ 11.998507][ T66] ? process_one_work+0xe0b/0x16d0 [ 11.998718][ T66] process_one_work+0xe55/0x16d0 [ 11.998929][ T66] ? __pfx___lock_release+0x10/0x10 [ 11.999119][ T66] ? __pfx_process_one_work+0x10/0x10 [ 11.999317][ T66] ? assign_work+0x16c/0x240 [ 11.999524][ T66] worker_thread+0x58c/0xce0 [ 11.999726][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 11.999988][ T66] ? __pfx_worker_thread+0x10/0x10 [ 12.000189][ T66] ? __pfx_worker_thread+0x10/0x10 [ 12.000408][ T66] kthread+0x28a/0x350 [ 12.000566][ T66] ? __pfx_kthread+0x10/0x10 [ 12.000771][ T66] ret_from_fork+0x31/0x70 [ 12.000976][ T66] ? __pfx_kthread+0x10/0x10 [ 12.001181][ T66] ret_from_fork_asm+0x1a/0x30 [ 12.001399][ T66] [ 12.001565][ T66] [ 12.001676][ T66] Allocated by task 226: [ 12.001833][ T66] kasan_save_stack+0x24/0x50 [ 12.002054][ T66] kasan_save_track+0x14/0x30 [ 12.002263][ T66] __kasan_slab_alloc+0x59/0x70 [ 12.002492][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 12.002714][ T66] copy_net_ns+0xc6/0x340 [ 12.002870][ T66] create_new_namespaces+0x35f/0x920 [ 12.003076][ T66] unshare_nsproxy_namespaces+0x8d/0x130 [ 12.003270][ T66] ksys_unshare+0x2a9/0x660 [ 12.003483][ T66] __x64_sys_unshare+0x31/0x40 [ 12.003688][ T66] do_syscall_64+0xc1/0x1d0 [ 12.003895][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.004161][ T66] [ 12.004270][ T66] Freed by task 66: [ 12.004443][ T66] kasan_save_stack+0x24/0x50 [ 12.004668][ T66] kasan_save_track+0x14/0x30 [ 12.004895][ T66] kasan_save_free_info+0x3b/0x60 [ 12.005102][ T66] __kasan_slab_free+0x38/0x50 [ 12.005306][ T66] kmem_cache_free+0xf8/0x330 [ 12.005522][ T66] cleanup_net+0x5a8/0xa40 [ 12.005748][ T66] process_one_work+0xe55/0x16d0 [ 12.005952][ T66] worker_thread+0x58c/0xce0 [ 12.006160][ T66] kthread+0x28a/0x350 [ 12.006319][ T66] ret_from_fork+0x31/0x70 [ 12.006547][ T66] ret_from_fork_asm+0x1a/0x30 [ 12.006773][ T66] [ 12.006905][ T66] The buggy address belongs to the object at ffff88800b7b0040 [ 12.006905][ T66] which belongs to the cache net_namespace of size 5696 [ 12.007447][ T66] The buggy address is located 184 bytes inside of [ 12.007447][ T66] freed 5696-byte region [ffff88800b7b0040, ffff88800b7b1680) [ 12.007944][ T66] [ 12.008052][ T66] The buggy address belongs to the physical page: [ 12.008301][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800b7b2fc0 pfn:0xb7b0 [ 12.008737][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 12.009045][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 12.009323][ T66] page_type: f5(slab) [ 12.009487][ T66] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 12.009854][ T66] raw: ffff88800b7b2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 12.010257][ T66] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 12.010636][ T66] head: ffff88800b7b2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 12.010998][ T66] head: 0080000000000003 ffffea00002dec01 ffffffffffffffff 0000000000000000 [ 12.011378][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 12.011736][ T66] page dumped because: kasan: bad access detected [ 12.011997][ T66] [ 12.012105][ T66] Memory state around the buggy address: [ 12.012300][ T66] ffff88800b7aff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.012598][ T66] ffff88800b7b0000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 12.012888][ T66] >ffff88800b7b0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.013208][ T66] ^ [ 12.013510][ T66] ffff88800b7b0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.013802][ T66] ffff88800b7b0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.014107][ T66] ================================================================== [ 12.014546][ T66] Disabling lock debugging due to kernel taint