================================================================== BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:835 [inline] BUG: KASAN: use-after-free in hlist_del include/linux/list.h:852 [inline] BUG: KASAN: use-after-free in __cpuhp_state_remove_instance+0x58b/0x5b0 kernel/cpu.c:2002 Read of size 8 at addr ffff88806a515698 by task syz-executor.0/17670 CPU: 3 PID: 17670 Comm: syz-executor.0 Not tainted 5.12.0-rc1-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xfa/0x151 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416 __hlist_del include/linux/list.h:835 [inline] hlist_del include/linux/list.h:852 [inline] __cpuhp_state_remove_instance+0x58b/0x5b0 kernel/cpu.c:2002 cpuhp_state_remove_instance_nocalls include/linux/cpuhotplug.h:407 [inline] io_wq_create+0x6ca/0xbf0 fs/io-wq.c:1056 io_init_wq_offload fs/io_uring.c:7792 [inline] io_uring_alloc_task_context+0x1bf/0x6a0 fs/io_uring.c:7811 io_uring_add_task_file+0x261/0x350 fs/io_uring.c:8773 io_uring_install_fd fs/io_uring.c:9381 [inline] io_uring_create fs/io_uring.c:9532 [inline] io_uring_setup+0x14c7/0x2be0 fs/io_uring.c:9571 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7fa2549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f557b5ac EFLAGS: 00000282 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 0000000000005c6f RCX: 0000000020000100 RDX: 00000000f557b670 RSI: 000000000816c000 RDI: 0000000020ffd000 RBP: 00000000200001c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 17670: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:427 [inline] ____kasan_kmalloc mm/kasan/common.c:506 [inline] ____kasan_kmalloc mm/kasan/common.c:465 [inline] __kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515 kmalloc include/linux/slab.h:554 [inline] kzalloc include/linux/slab.h:684 [inline] io_wq_create+0xc0/0xbf0 fs/io-wq.c:1002 io_init_wq_offload fs/io_uring.c:7792 [inline] io_uring_alloc_task_context+0x1bf/0x6a0 fs/io_uring.c:7811 io_uring_add_task_file+0x261/0x350 fs/io_uring.c:8773 io_uring_install_fd fs/io_uring.c:9381 [inline] io_uring_create fs/io_uring.c:9532 [inline] io_uring_setup+0x14c7/0x2be0 fs/io_uring.c:9571 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Freed by task 17670: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x72/0x1b0 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xe5/0x7b0 mm/slub.c:4213 io_wq_destroy fs/io-wq.c:1091 [inline] io_wq_put+0x4d0/0x6d0 fs/io-wq.c:1098 io_wq_create+0x92d/0xbf0 fs/io-wq.c:1053 io_init_wq_offload fs/io_uring.c:7792 [inline] io_uring_alloc_task_context+0x1bf/0x6a0 fs/io_uring.c:7811 io_uring_add_task_file+0x261/0x350 fs/io_uring.c:8773 io_uring_install_fd fs/io_uring.c:9381 [inline] io_uring_create fs/io_uring.c:9532 [inline] io_uring_setup+0x14c7/0x2be0 fs/io_uring.c:9571 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345 __call_rcu kernel/rcu/tree.c:3039 [inline] call_rcu+0xb1/0x700 kernel/rcu/tree.c:3114 neigh_parms_release net/core/neighbour.c:1662 [inline] neigh_parms_release+0x1e3/0x260 net/core/neighbour.c:1652 inetdev_destroy net/ipv4/devinet.c:325 [inline] inetdev_event+0xd3d/0x15c0 net/ipv4/devinet.c:1598 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2063 call_netdevice_notifiers_extack net/core/dev.c:2075 [inline] call_netdevice_notifiers net/core/dev.c:2089 [inline] unregister_netdevice_many+0x942/0x1760 net/core/dev.c:10905 unregister_netdevice_queue+0x2dd/0x3c0 net/core/dev.c:10839 unregister_netdevice include/linux/netdevice.h:2882 [inline] __tun_detach+0x105a/0x13d0 drivers/net/tun.c:662 tun_detach drivers/net/tun.c:679 [inline] tun_chr_close+0xd9/0x180 drivers/net/tun.c:3347 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301 __do_fast_syscall_32+0x62/0x80 arch/x86/entry/common.c:142 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345 insert_work+0x48/0x370 kernel/workqueue.c:1331 __queue_work+0x5c1/0xf00 kernel/workqueue.c:1497 queue_work_on+0xae/0xc0 kernel/workqueue.c:1524 queue_work include/linux/workqueue.h:507 [inline] call_usermodehelper_exec+0x1f0/0x4c0 kernel/umh.c:433 kobject_uevent_env+0xf9f/0x1680 lib/kobject_uevent.c:617 netdev_queue_add_kobject net/core/net-sysfs.c:1652 [inline] netdev_queue_update_kobjects+0x2ff/0x3d0 net/core/net-sysfs.c:1686 register_queue_kobjects net/core/net-sysfs.c:1747 [inline] netdev_register_kobject+0x35a/0x430 net/core/net-sysfs.c:1990 register_netdevice+0xd33/0x14a0 net/core/dev.c:10178 register_netdev+0x2d/0x50 net/core/dev.c:10302 sit_init_net+0x3a4/0xac0 net/ipv6/sit.c:1917 ops_init+0xaf/0x470 net/core/net_namespace.c:140 setup_net+0x40f/0xa30 net/core/net_namespace.c:333 copy_net_ns+0x31e/0x760 net/core/net_namespace.c:474 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x8e0 kernel/fork.c:2955 __do_sys_unshare kernel/fork.c:3023 [inline] __se_sys_unshare kernel/fork.c:3021 [inline] __ia32_sys_unshare+0x2c/0x40 kernel/fork.c:3021 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c The buggy address belongs to the object at ffff88806a515600 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 152 bytes inside of 192-byte region [ffff88806a515600, ffff88806a5156c0) The buggy address belongs to the page: page:000000000282ce24 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88806a515c00 pfn:0x6a515 flags: 0x4fff00000000200(slab) raw: 04fff00000000200 ffffea00011f4f40 0000000d00000007 ffff888010842a00 raw: ffff88806a515c00 000000008010000f 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88806a515580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88806a515600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88806a515680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88806a515700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88806a515780: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================