[ 14.208210][ T66] ================================================================== [ 14.208526][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 14.208756][ T66] Read of size 8 at addr ffff88800aba00f8 by task kworker/u16:1/66 [ 14.208947][ T66] [ 14.209024][ T66] CPU: 0 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 14.209304][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 14.209501][ T66] Workqueue: netns cleanup_net [ 14.209666][ T66] Call Trace: [ 14.209776][ T66] [ 14.209915][ T66] dump_stack_lvl+0x82/0xd0 [ 14.210061][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 14.210278][ T66] ? cleanup_net+0x932/0xa40 [ 14.210427][ T66] print_report+0xb4/0x270 [ 14.210580][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 14.210982][ T66] kasan_report+0xbd/0xf0 [ 14.211099][ T66] ? cleanup_net+0x932/0xa40 [ 14.211253][ T66] cleanup_net+0x932/0xa40 [ 14.211429][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 14.211599][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 14.211764][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 14.211917][ T66] ? lock_acquire+0x32/0xc0 [ 14.212072][ T66] ? process_one_work+0xe0b/0x16d0 [ 14.212228][ T66] process_one_work+0xe55/0x16d0 [ 14.212387][ T66] ? __pfx___lock_release+0x10/0x10 [ 14.212558][ T66] ? __pfx_process_one_work+0x10/0x10 [ 14.212723][ T66] ? assign_work+0x16c/0x240 [ 14.212909][ T66] worker_thread+0x58c/0xce0 [ 14.213086][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 14.213313][ T66] ? __pfx_worker_thread+0x10/0x10 [ 14.213473][ T66] ? __pfx_worker_thread+0x10/0x10 [ 14.213641][ T66] kthread+0x28a/0x350 [ 14.213769][ T66] ? __pfx_kthread+0x10/0x10 [ 14.213921][ T66] ret_from_fork+0x31/0x70 [ 14.214090][ T66] ? __pfx_kthread+0x10/0x10 [ 14.214253][ T66] ret_from_fork_asm+0x1a/0x30 [ 14.214434][ T66] [ 14.214550][ T66] [ 14.214629][ T66] Allocated by task 228: [ 14.214746][ T66] kasan_save_stack+0x24/0x50 [ 14.214926][ T66] kasan_save_track+0x14/0x30 [ 14.215086][ T66] __kasan_slab_alloc+0x59/0x70 [ 14.215259][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 14.215419][ T66] copy_net_ns+0xc6/0x340 [ 14.215540][ T66] create_new_namespaces+0x35f/0x920 [ 14.215722][ T66] unshare_nsproxy_namespaces+0x8d/0x130 [ 14.215903][ T66] ksys_unshare+0x2a9/0x660 [ 14.216079][ T66] __x64_sys_unshare+0x31/0x40 [ 14.216291][ T66] do_syscall_64+0xc1/0x1d0 [ 14.216455][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 14.216643][ T66] [ 14.216727][ T66] Freed by task 66: [ 14.216841][ T66] kasan_save_stack+0x24/0x50 [ 14.217007][ T66] kasan_save_track+0x14/0x30 [ 14.217177][ T66] kasan_save_free_info+0x3b/0x60 [ 14.217344][ T66] __kasan_slab_free+0x38/0x50 [ 14.217515][ T66] kmem_cache_free+0xf8/0x330 [ 14.217672][ T66] cleanup_net+0x5a8/0xa40 [ 14.217833][ T66] process_one_work+0xe55/0x16d0 [ 14.218031][ T66] worker_thread+0x58c/0xce0 [ 14.218194][ T66] kthread+0x28a/0x350 [ 14.218344][ T66] ret_from_fork+0x31/0x70 [ 14.218514][ T66] ret_from_fork_asm+0x1a/0x30 [ 14.218664][ T66] [ 14.218782][ T66] The buggy address belongs to the object at ffff88800aba0040 [ 14.218782][ T66] which belongs to the cache net_namespace of size 5696 [ 14.219240][ T66] The buggy address is located 184 bytes inside of [ 14.219240][ T66] freed 5696-byte region [ffff88800aba0040, ffff88800aba1680) [ 14.219662][ T66] [ 14.219769][ T66] The buggy address belongs to the physical page: [ 14.219962][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800aba2fc0 pfn:0xaba0 [ 14.220297][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 14.220534][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 14.220752][ T66] page_type: f5(slab) [ 14.220869][ T66] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 14.221131][ T66] raw: ffff88800aba2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 14.221479][ T66] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 14.221753][ T66] head: ffff88800aba2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 14.222019][ T66] head: 0080000000000003 ffffea00002ae801 ffffffffffffffff 0000000000000000 [ 14.222312][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 14.222602][ T66] page dumped because: kasan: bad access detected [ 14.222802][ T66] [ 14.222882][ T66] Memory state around the buggy address: [ 14.223122][ T66] ffff88800ab9ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 14.223374][ T66] ffff88800aba0000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 14.223630][ T66] >ffff88800aba0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 14.223945][ T66] ^ [ 14.224177][ T66] ffff88800aba0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 14.224464][ T66] ffff88800aba0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 14.224725][ T66] ================================================================== [ 14.225014][ T66] Disabling lock debugging due to kernel taint