================================================================== 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 ffff888024f24098 by task syz-executor.1/17323 CPU: 3 PID: 17323 Comm: syz-executor.1 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/0x2c6 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_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465f69 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f47080a0108 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69 RDX: 0000000020ffd000 RSI: 0000000020000240 RDI: 0000000000002de5 RBP: 0000000020000240 R08: 0000000020000140 R09: 0000000020000140 R10: 0000000020000100 R11: 0000000000000202 R12: 0000000020000140 R13: 0000000020ffd000 R14: 0000000020000100 R15: 0000000020002000 Allocated by task 17323: 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+0x96/0xc0 mm/kasan/common.c:515 kasan_kmalloc include/linux/kasan.h:233 [inline] kmem_cache_alloc_trace+0x1ef/0x430 mm/slab.c:3570 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_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 17323: 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+0xc7/0x100 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] __cache_free mm/slab.c:3440 [inline] kfree+0x104/0x2a0 mm/slab.c:3796 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_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xa4/0xd0 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 rx_queue_add_kobject net/core/net-sysfs.c:1020 [inline] net_rx_queue_update_kobjects+0xee/0x450 net/core/net-sysfs.c:1060 register_queue_kobjects net/core/net-sysfs.c:1742 [inline] netdev_register_kobject+0x275/0x430 net/core/net-sysfs.c:1990 register_netdevice+0xd33/0x14a0 net/core/dev.c:10178 __tun_chr_ioctl.isra.0+0x2be3/0x4140 drivers/net/tun.c:2735 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xa4/0xd0 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 addrconf_ifdown.isra.0+0xfe9/0x15b0 net/ipv6/addrconf.c:3850 addrconf_notify+0x55c/0x23e0 net/ipv6/addrconf.c:3631 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 vlan_device_event+0x1aa6/0x2020 net/8021q/vlan.c:493 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 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888024f24000 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 152 bytes inside of 192-byte region [ffff888024f24000, ffff888024f240c0) The buggy address belongs to the page: page:0000000028e96ac4 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24f24 flags: 0xfff00000000200(slab) raw: 00fff00000000200 ffffea00004b6108 ffffea0000717408 ffff888010840000 raw: 0000000000000000 ffff888024f24000 0000000100000010 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888024f23f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888024f24000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888024f24080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888024f24100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888024f24180: 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================