[ 12.300142][ T307] sysctl (307) used greatest stack depth: 24472 bytes left [ 16.189851][ T363] ip (363) used greatest stack depth: 23800 bytes left [ 36.994390][ T68] ================================================================== [ 36.994813][ T68] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 36.995087][ T68] Read of size 8 at addr ffff88800a0080f8 by task kworker/u16:1/68 [ 36.995285][ T68] [ 36.995356][ T68] CPU: 2 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 36.995571][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 36.995741][ T68] Workqueue: netns cleanup_net [ 36.995882][ T68] Call Trace: [ 36.995985][ T68] [ 36.996056][ T68] dump_stack_lvl+0x82/0xd0 [ 36.996197][ T68] print_address_description.constprop.0+0x2c/0x3b0 [ 36.996367][ T68] ? cleanup_net+0xa5d/0xb90 [ 36.996507][ T68] print_report+0xb4/0x270 [ 36.996642][ T68] ? kasan_addr_to_slab+0x25/0x80 [ 36.996777][ T68] kasan_report+0xbd/0xf0 [ 36.996882][ T68] ? cleanup_net+0xa5d/0xb90 [ 36.997019][ T68] cleanup_net+0xa5d/0xb90 [ 36.997155][ T68] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 36.997293][ T68] ? __pfx_cleanup_net+0x10/0x10 [ 36.997429][ T68] ? trace_lock_acquire+0x148/0x1f0 [ 36.997566][ T68] ? lock_acquire+0x32/0xc0 [ 36.997702][ T68] ? process_one_work+0xe0b/0x16d0 [ 36.997840][ T68] process_one_work+0xe55/0x16d0 [ 36.997976][ T68] ? __pfx___lock_release+0x10/0x10 [ 36.998113][ T68] ? __pfx_process_one_work+0x10/0x10 [ 36.998250][ T68] ? assign_work+0x16c/0x240 [ 36.998387][ T68] worker_thread+0x58c/0xce0 [ 36.998523][ T68] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 36.998692][ T68] ? __pfx_worker_thread+0x10/0x10 [ 36.998825][ T68] ? __pfx_worker_thread+0x10/0x10 [ 36.998960][ T68] kthread+0x28a/0x350 [ 36.999066][ T68] ? __pfx_kthread+0x10/0x10 [ 36.999203][ T68] ret_from_fork+0x31/0x70 [ 36.999337][ T68] ? __pfx_kthread+0x10/0x10 [ 36.999473][ T68] ret_from_fork_asm+0x1a/0x30 [ 36.999613][ T68] [ 36.999716][ T68] [ 36.999784][ T68] Allocated by task 260: [ 36.999888][ T68] kasan_save_stack+0x24/0x50 [ 37.000023][ T68] kasan_save_track+0x14/0x30 [ 37.000156][ T68] __kasan_slab_alloc+0x59/0x70 [ 37.000293][ T68] kmem_cache_alloc_noprof+0x10b/0x350 [ 37.000429][ T68] copy_net_ns+0xc6/0x540 [ 37.000531][ T68] create_new_namespaces+0x35f/0x920 [ 37.000671][ T68] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 37.000807][ T68] ksys_unshare+0x2c4/0x6e0 [ 37.000944][ T68] __x64_sys_unshare+0x31/0x40 [ 37.001077][ T68] do_syscall_64+0xc1/0x1d0 [ 37.001214][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 37.001386][ T68] [ 37.001456][ T68] Freed by task 68: [ 37.001558][ T68] kasan_save_stack+0x24/0x50 [ 37.001696][ T68] kasan_save_track+0x14/0x30 [ 37.001832][ T68] kasan_save_free_info+0x3b/0x60 [ 37.001970][ T68] __kasan_slab_free+0x38/0x50 [ 37.002107][ T68] kmem_cache_free+0xf8/0x330 [ 37.002239][ T68] cleanup_net+0x5a8/0xb90 [ 37.002375][ T68] process_one_work+0xe55/0x16d0 [ 37.002511][ T68] worker_thread+0x58c/0xce0 [ 37.002649][ T68] kthread+0x28a/0x350 [ 37.002751][ T68] ret_from_fork+0x31/0x70 [ 37.002888][ T68] ret_from_fork_asm+0x1a/0x30 [ 37.003024][ T68] [ 37.003091][ T68] The buggy address belongs to the object at ffff88800a008040 [ 37.003091][ T68] which belongs to the cache net_namespace of size 6528 [ 37.003446][ T68] The buggy address is located 184 bytes inside of [ 37.003446][ T68] freed 6528-byte region [ffff88800a008040, ffff88800a0099c0) [ 37.003771][ T68] [ 37.003841][ T68] The buggy address belongs to the physical page: [ 37.004005][ T68] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa008 [ 37.004243][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 37.004445][ T68] flags: 0x80000000000040(head|node=0|zone=1) [ 37.004618][ T68] page_type: f5(slab) [ 37.004724][ T68] raw: 0080000000000040 ffff888001975240 ffff88800197a0a8 ffff88800197a0a8 [ 37.004963][ T68] raw: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000 [ 37.005202][ T68] head: 0080000000000040 ffff888001975240 ffff88800197a0a8 ffff88800197a0a8 [ 37.005449][ T68] head: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000 [ 37.005690][ T68] head: 0080000000000003 ffffea0000280201 ffffffffffffffff 0000000000000000 [ 37.005930][ T68] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 37.006169][ T68] page dumped because: kasan: bad access detected [ 37.006337][ T68] [ 37.006416][ T68] Memory state around the buggy address: [ 37.006549][ T68] ffff88800a007f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 37.006758][ T68] ffff88800a008000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 37.006955][ T68] >ffff88800a008080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.007154][ T68] ^ [ 37.007353][ T68] ffff88800a008100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.007545][ T68] ffff88800a008180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.007740][ T68] ================================================================== [ 37.007996][ T68] Disabling lock debugging due to kernel taint [ 37.104767][ T68] veth-t100: Failed to cycle device veth-t100; route tables might be wrong!