[ 10.121064][ T227] modprobe (227) used greatest stack depth: 24504 bytes left [ 10.278285][ T67] ================================================================== [ 10.278553][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.278780][ T67] Read of size 8 at addr ffff88800b0080f8 by task kworker/u16:1/67 [ 10.278995][ T67] [ 10.279070][ T67] CPU: 1 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.279301][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.279492][ T67] Workqueue: netns cleanup_net [ 10.279653][ T67] Call Trace: [ 10.279770][ T67] [ 10.279851][ T67] dump_stack_lvl+0x82/0xd0 [ 10.280010][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 10.280206][ T67] ? cleanup_net+0x932/0xa40 [ 10.280356][ T67] print_report+0xb4/0x270 [ 10.280521][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 10.280668][ T67] kasan_report+0xbd/0xf0 [ 10.280783][ T67] ? cleanup_net+0x932/0xa40 [ 10.280930][ T67] cleanup_net+0x932/0xa40 [ 10.281080][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.281231][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 10.281373][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 10.281518][ T67] ? lock_acquire+0x32/0xc0 [ 10.281665][ T67] ? process_one_work+0xe0b/0x16d0 [ 10.281815][ T67] process_one_work+0xe55/0x16d0 [ 10.281964][ T67] ? __pfx___lock_release+0x10/0x10 [ 10.282110][ T67] ? __pfx_process_one_work+0x10/0x10 [ 10.282257][ T67] ? assign_work+0x16c/0x240 [ 10.282400][ T67] worker_thread+0x58c/0xce0 [ 10.282549][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.282737][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.282886][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.283033][ T67] kthread+0x28a/0x350 [ 10.283145][ T67] ? __pfx_kthread+0x10/0x10 [ 10.283291][ T67] ret_from_fork+0x31/0x70 [ 10.283438][ T67] ? __pfx_kthread+0x10/0x10 [ 10.283588][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.283738][ T67] [ 10.283849][ T67] [ 10.283923][ T67] Allocated by task 226: [ 10.284035][ T67] kasan_save_stack+0x24/0x50 [ 10.284186][ T67] kasan_save_track+0x14/0x30 [ 10.284330][ T67] __kasan_slab_alloc+0x59/0x70 [ 10.284474][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.284620][ T67] copy_net_ns+0xc6/0x340 [ 10.284731][ T67] create_new_namespaces+0x35f/0x920 [ 10.284875][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.285022][ T67] ksys_unshare+0x2a9/0x660 [ 10.285172][ T67] __x64_sys_unshare+0x31/0x40 [ 10.285320][ T67] do_syscall_64+0xc1/0x1d0 [ 10.285464][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.285644][ T67] [ 10.285718][ T67] Freed by task 67: [ 10.285837][ T67] kasan_save_stack+0x24/0x50 [ 10.285982][ T67] kasan_save_track+0x14/0x30 [ 10.286136][ T67] kasan_save_free_info+0x3b/0x60 [ 10.286283][ T67] __kasan_slab_free+0x38/0x50 [ 10.286426][ T67] kmem_cache_free+0xf8/0x330 [ 10.286573][ T67] cleanup_net+0x5a8/0xa40 [ 10.286717][ T67] process_one_work+0xe55/0x16d0 [ 10.286859][ T67] worker_thread+0x58c/0xce0 [ 10.287002][ T67] kthread+0x28a/0x350 [ 10.287116][ T67] ret_from_fork+0x31/0x70 [ 10.287253][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.287395][ T67] [ 10.287468][ T67] The buggy address belongs to the object at ffff88800b008040 [ 10.287468][ T67] which belongs to the cache net_namespace of size 5696 [ 10.287849][ T67] The buggy address is located 184 bytes inside of [ 10.287849][ T67] freed 5696-byte region [ffff88800b008040, ffff88800b009680) [ 10.288200][ T67] [ 10.288275][ T67] The buggy address belongs to the physical page: [ 10.288452][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800b00afc0 pfn:0xb008 [ 10.288745][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.288964][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.289170][ T67] page_type: f5(slab) [ 10.289289][ T67] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.289544][ T67] raw: ffff88800b00afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.289797][ T67] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.290063][ T67] head: ffff88800b00afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.290314][ T67] head: 0080000000000003 ffffea00002c0201 ffffffffffffffff 0000000000000000 [ 10.290564][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.290817][ T67] page dumped because: kasan: bad access detected [ 10.290997][ T67] [ 10.291071][ T67] Memory state around the buggy address: [ 10.291217][ T67] ffff88800b007f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.291433][ T67] ffff88800b008000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.291643][ T67] >ffff88800b008080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.291855][ T67] ^ [ 10.292069][ T67] ffff88800b008100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.292278][ T67] ffff88800b008180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.292487][ T67] ================================================================== [ 10.292769][ T67] Disabling lock debugging due to kernel taint