[ 10.457145][ T66] ================================================================== [ 10.457371][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.457566][ T66] Read of size 8 at addr ffff88800b6080f8 by task kworker/u16:1/66 [ 10.457747][ T66] [ 10.457816][ T66] CPU: 3 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.458004][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.458160][ T66] Workqueue: netns cleanup_net [ 10.458295][ T66] Call Trace: [ 10.458425][ T66] [ 10.458493][ T66] dump_stack_lvl+0x82/0xd0 [ 10.458629][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 10.458790][ T66] ? cleanup_net+0x932/0xa40 [ 10.458918][ T66] print_report+0xb4/0x270 [ 10.459047][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 10.459180][ T66] kasan_report+0xbd/0xf0 [ 10.459281][ T66] ? cleanup_net+0x932/0xa40 [ 10.459407][ T66] cleanup_net+0x932/0xa40 [ 10.459535][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.459693][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 10.459814][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 10.459938][ T66] ? lock_acquire+0x32/0xc0 [ 10.460062][ T66] ? process_one_work+0xe0b/0x16d0 [ 10.460188][ T66] process_one_work+0xe55/0x16d0 [ 10.460312][ T66] ? __pfx___lock_release+0x10/0x10 [ 10.460454][ T66] ? __pfx_process_one_work+0x10/0x10 [ 10.460583][ T66] ? assign_work+0x16c/0x240 [ 10.460711][ T66] worker_thread+0x58c/0xce0 [ 10.460866][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.461018][ T66] ? __pfx_worker_thread+0x10/0x10 [ 10.461149][ T66] ? __pfx_worker_thread+0x10/0x10 [ 10.461277][ T66] kthread+0x28a/0x350 [ 10.461383][ T66] ? __pfx_kthread+0x10/0x10 [ 10.461561][ T66] ret_from_fork+0x31/0x70 [ 10.461714][ T66] ? __pfx_kthread+0x10/0x10 [ 10.461870][ T66] ret_from_fork_asm+0x1a/0x30 [ 10.462008][ T66] [ 10.462114][ T66] [ 10.462188][ T66] Allocated by task 227: [ 10.462323][ T66] kasan_save_stack+0x24/0x50 [ 10.462462][ T66] kasan_save_track+0x14/0x30 [ 10.462599][ T66] __kasan_slab_alloc+0x59/0x70 [ 10.462726][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.462871][ T66] copy_net_ns+0xc6/0x340 [ 10.462977][ T66] create_new_namespaces+0x35f/0x920 [ 10.463114][ T66] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.463252][ T66] ksys_unshare+0x2a9/0x660 [ 10.463395][ T66] __x64_sys_unshare+0x31/0x40 [ 10.463535][ T66] do_syscall_64+0xc1/0x1d0 [ 10.463674][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.463847][ T66] [ 10.463918][ T66] Freed by task 66: [ 10.464024][ T66] kasan_save_stack+0x24/0x50 [ 10.464162][ T66] kasan_save_track+0x14/0x30 [ 10.464299][ T66] kasan_save_free_info+0x3b/0x60 [ 10.464437][ T66] __kasan_slab_free+0x38/0x50 [ 10.464575][ T66] kmem_cache_free+0xf8/0x330 [ 10.464707][ T66] cleanup_net+0x5a8/0xa40 [ 10.464847][ T66] process_one_work+0xe55/0x16d0 [ 10.464983][ T66] worker_thread+0x58c/0xce0 [ 10.465121][ T66] kthread+0x28a/0x350 [ 10.465224][ T66] ret_from_fork+0x31/0x70 [ 10.465360][ T66] ret_from_fork_asm+0x1a/0x30 [ 10.465517][ T66] [ 10.465588][ T66] The buggy address belongs to the object at ffff88800b608040 [ 10.465588][ T66] which belongs to the cache net_namespace of size 5696 [ 10.465952][ T66] The buggy address is located 184 bytes inside of [ 10.465952][ T66] freed 5696-byte region [ffff88800b608040, ffff88800b609680) [ 10.466292][ T66] [ 10.466379][ T66] The buggy address belongs to the physical page: [ 10.466546][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800b60afc0 pfn:0xb608 [ 10.466820][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.467025][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.467199][ T66] page_type: f5(slab) [ 10.467312][ T66] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.467556][ T66] raw: ffff88800b60afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.467794][ T66] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.468039][ T66] head: ffff88800b60afc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.468276][ T66] head: 0080000000000003 ffffea00002d8201 ffffffffffffffff 0000000000000000 [ 10.468521][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.468757][ T66] page dumped because: kasan: bad access detected [ 10.468927][ T66] [ 10.468994][ T66] Memory state around the buggy address: [ 10.469126][ T66] ffff88800b607f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 10.469326][ T66] ffff88800b608000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.469526][ T66] >ffff88800b608080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.469723][ T66] ^ [ 10.469921][ T66] ffff88800b608100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.470115][ T66] ffff88800b608180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.470340][ T66] ================================================================== [ 10.470567][ T66] Disabling lock debugging due to kernel taint [ 10.883116][ T227] connect_ipv6 (227) used greatest stack depth: 24416 bytes left