[ 18.818488][ T277] ip (277) used greatest stack depth: 23424 bytes left [ 118.834047][ T12] ================================================================== [ 118.834562][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0 [ 118.835003][ T12] Read of size 1 at addr ffff8880054216c4 by task kworker/u16:0/12 [ 118.835417][ T12] [ 118.835568][ T12] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full) [ 118.835579][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 118.835586][ T12] Workqueue: netns cleanup_net [ 118.835611][ T12] Call Trace: [ 118.835615][ T12] [ 118.835620][ T12] dump_stack_lvl+0x82/0xc0 [ 118.835629][ T12] print_address_description.constprop.0+0x2c/0x3a0 [ 118.835642][ T12] ? kobject_put+0xbb/0xd0 [ 118.835648][ T12] print_report+0xb4/0x270 [ 118.835654][ T12] ? kobject_put+0xbb/0xd0 [ 118.835658][ T12] ? kasan_addr_to_slab+0x21/0x70 [ 118.835664][ T12] ? kobject_put+0xbb/0xd0 [ 118.835669][ T12] kasan_report+0xca/0x100 [ 118.835676][ T12] ? kobject_put+0xbb/0xd0 [ 118.835685][ T12] kobject_put+0xbb/0xd0 [ 118.835691][ T12] netdev_run_todo+0x5f0/0xc60 [ 118.835702][ T12] ? dev_ingress_queue_create+0x190/0x190 [ 118.835709][ T12] ? generic_xdp_install+0x410/0x410 [ 118.835713][ T12] ? net_generic+0xb1/0x1f0 [ 118.835736][ T12] ops_undo_list+0x714/0x890 [ 118.835745][ T12] ? rtnl_net_dumpid_one+0x270/0x270 [ 118.835750][ T12] ? cleanup_net+0x2d6/0x8b0 [ 118.835758][ T12] cleanup_net+0x3b2/0x8b0 [ 118.835765][ T12] ? net_passive_dec+0x190/0x190 [ 118.835772][ T12] ? rcu_is_watching+0x12/0xb0 [ 118.835786][ T12] process_one_work+0xe35/0x1650 [ 118.835804][ T12] ? pwq_dec_nr_in_flight+0x550/0x550 [ 118.835813][ T12] ? assign_work+0x168/0x240 [ 118.835821][ T12] worker_thread+0x591/0xcf0 [ 118.835831][ T12] ? rescuer_thread+0xd10/0xd10 [ 118.835838][ T12] kthread+0x37b/0x5f0 [ 118.835845][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 118.835850][ T12] ? ret_from_fork+0x1b/0x270 [ 118.835865][ T12] ? __lock_release+0x5d/0x170 [ 118.835873][ T12] ? rcu_is_watching+0x12/0xb0 [ 118.835878][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 118.835884][ T12] ret_from_fork+0x1db/0x270 [ 118.835888][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 118.835893][ T12] ret_from_fork_asm+0x11/0x20 [ 118.835911][ T12] [ 118.835913][ T12] [ 118.846026][ T12] Allocated by task 270: [ 118.846231][ T12] kasan_save_stack+0x24/0x40 [ 118.846556][ T12] kasan_save_track+0x14/0x30 [ 118.846825][ T12] __kasan_kmalloc+0x7b/0x90 [ 118.847100][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0 [ 118.847378][ T12] alloc_netdev_mqs+0x7d/0x1370 [ 118.847655][ T12] ip6_tnl_init_net+0x102/0x3f0 [ 118.847947][ T12] ops_init+0x189/0x550 [ 118.848161][ T12] setup_net+0xf1/0x380 [ 118.848382][ T12] copy_net_ns+0x253/0x510 [ 118.848652][ T12] create_new_namespaces+0x35f/0x900 [ 118.849097][ T12] unshare_nsproxy_namespaces+0x8a/0x1a0 [ 118.849372][ T12] ksys_unshare+0x2be/0x6e0 [ 118.849643][ T12] __x64_sys_unshare+0x31/0x40 [ 118.849943][ T12] do_syscall_64+0xc1/0xfd0 [ 118.850373][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 118.850747][ T12] [ 118.850894][ T12] Freed by task 12: [ 118.851109][ T12] kasan_save_stack+0x24/0x40 [ 118.851539][ T12] kasan_save_track+0x14/0x30 [ 118.851808][ T12] __kasan_save_free_info+0x3b/0x60 [ 118.852080][ T12] __kasan_slab_free+0x3f/0x60 [ 118.852366][ T12] kfree+0x21d/0x540 [ 118.852570][ T12] device_release+0x9c/0x210 [ 118.853022][ T12] kobject_cleanup+0xfe/0x360 [ 118.853301][ T12] netdev_run_todo+0x81f/0xc60 [ 118.853569][ T12] ops_undo_list+0x714/0x890 [ 118.853833][ T12] cleanup_net+0x3b2/0x8b0 [ 118.854253][ T12] process_one_work+0xe35/0x1650 [ 118.854521][ T12] worker_thread+0x591/0xcf0 [ 118.854785][ T12] kthread+0x37b/0x5f0 [ 118.854985][ T12] ret_from_fork+0x1db/0x270 [ 118.855406][ T12] ret_from_fork_asm+0x11/0x20 [ 118.855685][ T12] [ 118.855821][ T12] The buggy address belongs to the object at ffff888005421000 [ 118.855821][ T12] which belongs to the cache kmalloc-4k of size 4096 [ 118.856599][ T12] The buggy address is located 1732 bytes inside of [ 118.856599][ T12] freed 4096-byte region [ffff888005421000, ffff888005422000) [ 118.857225][ T12] [ 118.857364][ T12] The buggy address belongs to the physical page: [ 118.857707][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5420 [ 118.858182][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 118.858743][ T12] flags: 0x80000000000040(head|node=0|zone=1) [ 118.859098][ T12] page_type: f5(slab) [ 118.859311][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000154010 ffffea0000147e10 [ 118.859826][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 118.860500][ T12] head: 0080000000000040 ffff888001043700 ffffea0000154010 ffffea0000147e10 [ 118.860885][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 118.861371][ T12] head: 0080000000000003 ffffea0000150801 00000000ffffffff 00000000ffffffff [ 118.861747][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 [ 118.862224][ T12] page dumped because: kasan: bad access detected [ 118.862476][ T12] [ 118.862586][ T12] Memory state around the buggy address: [ 118.862786][ T12] ffff888005421580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 118.863212][ T12] ffff888005421600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 118.863520][ T12] >ffff888005421680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 118.863817][ T12] ^ [ 118.864213][ T12] ffff888005421700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 118.864527][ T12] ffff888005421780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 118.865003][ T12] ================================================================== [ 118.865616][ T12] Disabling lock debugging due to kernel taint [ 118.865892][ T12] ------------[ cut here ]------------ [ 118.866086][ T12] refcount_t: underflow; use-after-free. [ 118.866332][ T12] WARNING: CPU: 2 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0 [ 118.866838][ T12] Modules linked in: [ 118.867004][ T12] CPU: 2 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full) [ 118.867440][ T12] Tainted: [B]=BAD_PAGE [ 118.867616][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 118.867859][ T12] Workqueue: netns cleanup_net [ 118.868082][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0 [ 118.868341][ T12] Code: cc 38 03 80 fb 01 0f 87 29 33 d7 fe 83 e3 01 0f 85 51 ff ff ff c6 05 17 cc 38 03 01 90 48 c7 c7 40 ba 85 8b e8 62 d6 16 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 c0 9d a0 ff e9 ba fe ff ff [ 118.868998][ T12] RSP: 0018:ffffc900000c7a08 EFLAGS: 00010282 [ 118.869254][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 118.869567][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001 [ 118.869858][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1900934 [ 118.870146][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001 [ 118.870439][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100 [ 118.870743][ T12] FS: 0000000000000000(0000) GS:ffff8880df408000(0000) knlGS:0000000000000000 [ 118.871078][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 118.871329][ T12] CR2: 00007ffd69a1e840 CR3: 000000000f349003 CR4: 0000000000772ef0 [ 118.871615][ T12] PKRU: 55555554 [ 118.871764][ T12] Call Trace: [ 118.871929][ T12] [ 118.872040][ T12] netdev_run_todo+0x5f0/0xc60 [ 118.872240][ T12] ? dev_ingress_queue_create+0x190/0x190 [ 118.872459][ T12] ? generic_xdp_install+0x410/0x410 [ 118.872666][ T12] ? net_generic+0xb1/0x1f0 [ 118.872865][ T12] ops_undo_list+0x714/0x890 [ 118.873081][ T12] ? rtnl_net_dumpid_one+0x270/0x270 [ 118.873282][ T12] ? cleanup_net+0x2d6/0x8b0 [ 118.873496][ T12] cleanup_net+0x3b2/0x8b0 [ 118.873691][ T12] ? net_passive_dec+0x190/0x190 [ 118.873882][ T12] ? rcu_is_watching+0x12/0xb0 [ 118.874076][ T12] process_one_work+0xe35/0x1650 [ 118.874277][ T12] ? pwq_dec_nr_in_flight+0x550/0x550 [ 118.874481][ T12] ? assign_work+0x168/0x240 [ 118.874670][ T12] worker_thread+0x591/0xcf0 [ 118.874871][ T12] ? rescuer_thread+0xd10/0xd10 [ 118.875062][ T12] kthread+0x37b/0x5f0 [ 118.875217][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 118.875417][ T12] ? ret_from_fork+0x1b/0x270 [ 118.875622][ T12] ? __lock_release+0x5d/0x170 [ 118.875815][ T12] ? rcu_is_watching+0x12/0xb0 [ 118.876009][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 118.876198][ T12] ret_from_fork+0x1db/0x270 [ 118.876400][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 118.876614][ T12] ret_from_fork_asm+0x11/0x20 [ 118.876810][ T12] [ 118.876972][ T12] irq event stamp: 30583 [ 118.877124][ T12] hardirqs last enabled at (30583): [] finish_task_switch.isra.0+0x245/0x960 [ 118.877515][ T12] hardirqs last disabled at (30582): [] __schedule+0x94a/0x1b10 [ 118.878037][ T12] softirqs last enabled at (30384): [] handle_softirqs+0x352/0x610 [ 118.878567][ T12] softirqs last disabled at (30377): [] irq_exit_rcu+0xab/0x100 [ 118.879074][ T12] ---[ end trace 0000000000000000 ]---