[ 16.960885][ T249] ip (249) used greatest stack depth: 23248 bytes left [ 25.644787][ T304] netem: version 1.3 [ 153.282873][ T12] ================================================================== [ 153.283190][ T12] BUG: KASAN: slab-use-after-free in kobject_put+0xbb/0xd0 [ 153.283452][ T12] Read of size 1 at addr ffff88800568469c by task kworker/u16:0/12 [ 153.283692][ T12] [ 153.283777][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full) [ 153.283783][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 153.283787][ T12] Workqueue: netns cleanup_net [ 153.283796][ T12] Call Trace: [ 153.283799][ T12] [ 153.283801][ T12] dump_stack_lvl+0x82/0xc0 [ 153.283807][ T12] print_address_description.constprop.0+0x2c/0x3a0 [ 153.283815][ T12] ? kobject_put+0xbb/0xd0 [ 153.283818][ T12] print_report+0xb4/0x270 [ 153.283822][ T12] ? kobject_put+0xbb/0xd0 [ 153.283825][ T12] ? kasan_addr_to_slab+0x21/0x70 [ 153.283829][ T12] ? kobject_put+0xbb/0xd0 [ 153.283831][ T12] kasan_report+0xca/0x100 [ 153.283835][ T12] ? kobject_put+0xbb/0xd0 [ 153.283840][ T12] kobject_put+0xbb/0xd0 [ 153.283844][ T12] netdev_run_todo+0x5f0/0xc60 [ 153.283849][ T12] ? dev_ingress_queue_create+0x190/0x190 [ 153.283853][ T12] ? generic_xdp_install+0x410/0x410 [ 153.283859][ T12] ops_undo_list+0x714/0x890 [ 153.283864][ T12] ? netns_get+0x110/0x110 [ 153.283867][ T12] ? cleanup_net+0x2d6/0x830 [ 153.283873][ T12] cleanup_net+0x3b2/0x830 [ 153.283877][ T12] ? net_passive_dec+0x190/0x190 [ 153.283882][ T12] ? rcu_is_watching+0x12/0xb0 [ 153.283890][ T12] process_one_work+0xe35/0x1650 [ 153.283904][ T12] ? pwq_dec_nr_in_flight+0x550/0x550 [ 153.283914][ T12] ? assign_work+0x168/0x240 [ 153.283922][ T12] worker_thread+0x591/0xcf0 [ 153.283930][ T12] ? rescuer_thread+0xd10/0xd10 [ 153.283935][ T12] kthread+0x37b/0x5f0 [ 153.283940][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 153.283943][ T12] ? ret_from_fork+0x1b/0x270 [ 153.283949][ T12] ? __lock_release+0x5d/0x170 [ 153.283955][ T12] ? rcu_is_watching+0x12/0xb0 [ 153.283958][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 153.283962][ T12] ret_from_fork+0x1db/0x270 [ 153.283965][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 153.283968][ T12] ret_from_fork_asm+0x11/0x20 [ 153.283979][ T12] [ 153.283981][ T12] [ 153.290564][ T12] Allocated by task 248: [ 153.290689][ T12] kasan_save_stack+0x24/0x40 [ 153.290923][ T12] kasan_save_track+0x14/0x30 [ 153.291086][ T12] __kasan_kmalloc+0x7b/0x90 [ 153.291250][ T12] __kvmalloc_node_noprof+0x2e5/0x8e0 [ 153.291511][ T12] alloc_netdev_mqs+0x7d/0x1370 [ 153.291671][ T12] sit_init_net+0x169/0x550 [ 153.291846][ T12] ops_init+0x189/0x550 [ 153.291968][ T12] setup_net+0xf1/0x380 [ 153.292183][ T12] copy_net_ns+0x21a/0x380 [ 153.292343][ T12] create_new_namespaces+0x35f/0x900 [ 153.292516][ T12] unshare_nsproxy_namespaces+0x89/0x120 [ 153.292680][ T12] ksys_unshare+0x2a3/0x660 [ 153.292930][ T12] __x64_sys_unshare+0x31/0x40 [ 153.293089][ T12] do_syscall_64+0xc1/0xfd0 [ 153.293252][ T12] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 153.293455][ T12] [ 153.293621][ T12] Freed by task 12: [ 153.293761][ T12] kasan_save_stack+0x24/0x40 [ 153.293917][ T12] kasan_save_track+0x14/0x30 [ 153.294081][ T12] __kasan_save_free_info+0x3b/0x60 [ 153.294240][ T12] __kasan_slab_free+0x3f/0x60 [ 153.294502][ T12] kfree+0x21d/0x540 [ 153.294633][ T12] device_release+0x9c/0x210 [ 153.294799][ T12] kobject_cleanup+0xfe/0x360 [ 153.294962][ T12] netdev_run_todo+0x81f/0xc60 [ 153.295129][ T12] ops_undo_list+0x714/0x890 [ 153.295281][ T12] cleanup_net+0x3b2/0x830 [ 153.295441][ T12] process_one_work+0xe35/0x1650 [ 153.295602][ T12] worker_thread+0x591/0xcf0 [ 153.295759][ T12] kthread+0x37b/0x5f0 [ 153.295878][ T12] ret_from_fork+0x1db/0x270 [ 153.296043][ T12] ret_from_fork_asm+0x11/0x20 [ 153.296202][ T12] [ 153.296287][ T12] The buggy address belongs to the object at ffff888005684000 [ 153.296287][ T12] which belongs to the cache kmalloc-4k of size 4096 [ 153.296747][ T12] The buggy address is located 1692 bytes inside of [ 153.296747][ T12] freed 4096-byte region [ffff888005684000, ffff888005685000) [ 153.297205][ T12] [ 153.297283][ T12] The buggy address belongs to the physical page: [ 153.297476][ T12] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5680 [ 153.297753][ T12] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 153.297990][ T12] flags: 0x80000000000040(head|node=0|zone=1) [ 153.298206][ T12] page_type: f5(slab) [ 153.298334][ T12] raw: 0080000000000040 ffff888001043700 ffffea0000219810 ffffea000022ee10 [ 153.298614][ T12] raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 153.298890][ T12] head: 0080000000000040 ffff888001043700 ffffea0000219810 ffffea000022ee10 [ 153.299203][ T12] head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 [ 153.299486][ T12] head: 0080000000000003 ffffea000015a001 00000000ffffffff 00000000ffffffff [ 153.299874][ T12] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 [ 153.300170][ T12] page dumped because: kasan: bad access detected [ 153.300367][ T12] [ 153.300446][ T12] Memory state around the buggy address: [ 153.300600][ T12] ffff888005684580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 153.300829][ T12] ffff888005684600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 153.301148][ T12] >ffff888005684680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 153.301372][ T12] ^ [ 153.301527][ T12] ffff888005684700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 153.301839][ T12] ffff888005684780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 153.302081][ T12] ================================================================== [ 153.302430][ T12] Disabling lock debugging due to kernel taint [ 153.302698][ T12] ------------[ cut here ]------------ [ 153.302861][ T12] refcount_t: underflow; use-after-free. [ 153.303060][ T12] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0 [ 153.303462][ T12] Modules linked in: sch_netem [ 153.303638][ T12] CPU: 0 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full) [ 153.303984][ T12] Tainted: [B]=BAD_PAGE [ 153.304203][ T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 153.304410][ T12] Workqueue: netns cleanup_net [ 153.304578][ T12] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0 [ 153.304787][ T12] Code: 32 b8 02 80 fb 01 0f 87 cb 8b d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 e5 32 b8 02 01 90 48 c7 c7 60 8d 45 97 e8 42 c1 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff [ 153.305450][ T12] RSP: 0000:ffffc900000c7a08 EFLAGS: 00010282 [ 153.305773][ T12] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 153.306003][ T12] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001 [ 153.306246][ T12] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff2fc2934 [ 153.306631][ T12] R10: 0000000000000003 R11: ffffc900000c7580 R12: 0000000000000001 [ 153.306883][ T12] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100 [ 153.307237][ T12] FS: 0000000000000000(0000) GS:ffff88809cf84000(0000) knlGS:0000000000000000 [ 153.307546][ T12] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 153.307758][ T12] CR2: 00007fb17bd39178 CR3: 0000000022559004 CR4: 0000000000772ef0 [ 153.308009][ T12] PKRU: 55555554 [ 153.308147][ T12] Call Trace: [ 153.308281][ T12] [ 153.308392][ T12] netdev_run_todo+0x5f0/0xc60 [ 153.308566][ T12] ? dev_ingress_queue_create+0x190/0x190 [ 153.308749][ T12] ? generic_xdp_install+0x410/0x410 [ 153.308917][ T12] ops_undo_list+0x714/0x890 [ 153.309115][ T12] ? netns_get+0x110/0x110 [ 153.309303][ T12] ? cleanup_net+0x2d6/0x830 [ 153.309581][ T12] cleanup_net+0x3b2/0x830 [ 153.309759][ T12] ? net_passive_dec+0x190/0x190 [ 153.309934][ T12] ? rcu_is_watching+0x12/0xb0 [ 153.310128][ T12] process_one_work+0xe35/0x1650 [ 153.310297][ T12] ? pwq_dec_nr_in_flight+0x550/0x550 [ 153.310481][ T12] ? assign_work+0x168/0x240 [ 153.310651][ T12] worker_thread+0x591/0xcf0 [ 153.310823][ T12] ? rescuer_thread+0xd10/0xd10 [ 153.311082][ T12] kthread+0x37b/0x5f0 [ 153.311221][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 153.311396][ T12] ? ret_from_fork+0x1b/0x270 [ 153.311573][ T12] ? __lock_release+0x5d/0x170 [ 153.311755][ T12] ? rcu_is_watching+0x12/0xb0 [ 153.311926][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 153.312103][ T12] ret_from_fork+0x1db/0x270 [ 153.312277][ T12] ? kthread_is_per_cpu+0xc0/0xc0 [ 153.312457][ T12] ret_from_fork_asm+0x11/0x20 [ 153.312632][ T12] [ 153.312767][ T12] irq event stamp: 14339 [ 153.312904][ T12] hardirqs last enabled at (14339): [] irqentry_exit+0x3b/0x80 [ 153.313413][ T12] hardirqs last disabled at (14338): [] handle_softirqs+0x47f/0x610 [ 153.313759][ T12] softirqs last enabled at (14088): [] handle_softirqs+0x352/0x610 [ 153.314136][ T12] softirqs last disabled at (14081): [] irq_exit_rcu+0xab/0x100 [ 153.314516][ T12] ---[ end trace 0000000000000000 ]---