[ 11.072219][ T68] ================================================================== [ 11.072468][ T68] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 11.072677][ T68] Read of size 8 at addr ffff8880050a00f8 by task kworker/u16:1/68 [ 11.072879][ T68] [ 11.072956][ T68] CPU: 0 UID: 0 PID: 68 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 11.073168][ T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.073343][ T68] Workqueue: netns cleanup_net [ 11.073491][ T68] Call Trace: [ 11.073599][ T68] [ 11.073673][ T68] dump_stack_lvl+0x82/0xd0 [ 11.073817][ T68] print_address_description.constprop.0+0x2c/0x3b0 [ 11.073995][ T68] ? cleanup_net+0x932/0xa40 [ 11.074135][ T68] print_report+0xb4/0x270 [ 11.074273][ T68] ? kasan_addr_to_slab+0x25/0x80 [ 11.074413][ T68] kasan_report+0xbd/0xf0 [ 11.074520][ T68] ? cleanup_net+0x932/0xa40 [ 11.074660][ T68] cleanup_net+0x932/0xa40 [ 11.074798][ T68] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 11.074940][ T68] ? __pfx_cleanup_net+0x10/0x10 [ 11.075076][ T68] ? trace_lock_acquire+0x148/0x1f0 [ 11.075213][ T68] ? lock_acquire+0x32/0xc0 [ 11.075354][ T68] ? process_one_work+0xe0b/0x16d0 [ 11.075495][ T68] process_one_work+0xe55/0x16d0 [ 11.075633][ T68] ? __pfx___lock_release+0x10/0x10 [ 11.075785][ T68] ? __pfx_process_one_work+0x10/0x10 [ 11.075927][ T68] ? assign_work+0x16c/0x240 [ 11.076063][ T68] worker_thread+0x58c/0xce0 [ 11.076198][ T68] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 11.076371][ T68] ? __pfx_worker_thread+0x10/0x10 [ 11.076508][ T68] ? __pfx_worker_thread+0x10/0x10 [ 11.076647][ T68] kthread+0x28a/0x350 [ 11.076752][ T68] ? __pfx_kthread+0x10/0x10 [ 11.076891][ T68] ret_from_fork+0x31/0x70 [ 11.077032][ T68] ? __pfx_kthread+0x10/0x10 [ 11.077168][ T68] ret_from_fork_asm+0x1a/0x30 [ 11.077312][ T68] [ 11.077417][ T68] [ 11.077489][ T68] Allocated by task 227: [ 11.077593][ T68] kasan_save_stack+0x24/0x50 [ 11.077735][ T68] kasan_save_track+0x14/0x30 [ 11.077874][ T68] __kasan_slab_alloc+0x59/0x70 [ 11.078000][ T68] kmem_cache_alloc_noprof+0x10b/0x350 [ 11.078126][ T68] copy_net_ns+0xc6/0x340 [ 11.078220][ T68] create_new_namespaces+0x35f/0x920 [ 11.078348][ T68] unshare_nsproxy_namespaces+0x8d/0x130 [ 11.078491][ T68] ksys_unshare+0x2a9/0x660 [ 11.078629][ T68] __x64_sys_unshare+0x31/0x40 [ 11.078765][ T68] do_syscall_64+0xc1/0x1d0 [ 11.078894][ T68] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 11.079047][ T68] [ 11.079111][ T68] Freed by task 68: [ 11.079203][ T68] kasan_save_stack+0x24/0x50 [ 11.079326][ T68] kasan_save_track+0x14/0x30 [ 11.079455][ T68] kasan_save_free_info+0x3b/0x60 [ 11.079580][ T68] __kasan_slab_free+0x38/0x50 [ 11.079702][ T68] kmem_cache_free+0xf8/0x330 [ 11.079824][ T68] cleanup_net+0x5a8/0xa40 [ 11.079947][ T68] process_one_work+0xe55/0x16d0 [ 11.080068][ T68] worker_thread+0x58c/0xce0 [ 11.080192][ T68] kthread+0x28a/0x350 [ 11.080283][ T68] ret_from_fork+0x31/0x70 [ 11.080412][ T68] ret_from_fork_asm+0x1a/0x30 [ 11.080534][ T68] [ 11.080598][ T68] The buggy address belongs to the object at ffff8880050a0040 [ 11.080598][ T68] which belongs to the cache net_namespace of size 5696 [ 11.080920][ T68] The buggy address is located 184 bytes inside of [ 11.080920][ T68] freed 5696-byte region [ffff8880050a0040, ffff8880050a1680) [ 11.081214][ T68] [ 11.081277][ T68] The buggy address belongs to the physical page: [ 11.081433][ T68] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880050a2fc0 pfn:0x50a0 [ 11.081679][ T68] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 11.081867][ T68] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 11.082032][ T68] page_type: f5(slab) [ 11.082136][ T68] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.082353][ T68] raw: ffff8880050a2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.082566][ T68] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.082779][ T68] head: ffff8880050a2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.082994][ T68] head: 0080000000000003 ffffea0000142801 ffffffffffffffff 0000000000000000 [ 11.083209][ T68] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 11.083426][ T68] page dumped because: kasan: bad access detected [ 11.083579][ T68] [ 11.083642][ T68] Memory state around the buggy address: [ 11.083762][ T68] ffff88800509ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 11.083942][ T68] ffff8880050a0000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 11.084120][ T68] >ffff8880050a0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.084298][ T68] ^ [ 11.084482][ T68] ffff8880050a0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.084660][ T68] ffff8880050a0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.084837][ T68] ================================================================== [ 11.085033][ T68] Disabling lock debugging due to kernel taint