BUG: spinlock bad magic on CPU#1, kworker/1:18/11929 ================================================================== BUG: KASAN: slab-out-of-bounds in task_pid_nr include/linux/sched.h:1411 [inline] BUG: KASAN: slab-out-of-bounds in spin_dump kernel/locking/spinlock_debug.c:65 [inline] BUG: KASAN: slab-out-of-bounds in spin_bug.cold+0x95/0x9e kernel/locking/spinlock_debug.c:75 Read of size 4 at addr ffff8880233e28e8 by task kworker/1:18/11929 CPU: 1 PID: 11929 Comm: kworker/1:18 Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events l2cap_chan_timeout Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 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 task_pid_nr include/linux/sched.h:1411 [inline] spin_dump kernel/locking/spinlock_debug.c:65 [inline] spin_bug.cold+0x95/0x9e kernel/locking/spinlock_debug.c:75 debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] do_raw_spin_lock+0x216/0x2b0 kernel/locking/spinlock_debug.c:112 spin_lock_bh include/linux/spinlock.h:359 [inline] lock_sock_nested+0x40/0x120 net/core/sock.c:3057 l2cap_sock_teardown_cb+0xa1/0x660 net/bluetooth/l2cap_sock.c:1520 l2cap_chan_del+0xbc/0xa80 net/bluetooth/l2cap_core.c:618 l2cap_chan_close+0x1bc/0xaf0 net/bluetooth/l2cap_core.c:823 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:436 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Allocated by task 23839: 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:559 [inline] kzalloc include/linux/slab.h:684 [inline] __register_sysctl_table+0x112/0x1090 fs/proc/proc_sysctl.c:1317 __devinet_sysctl_register+0x156/0x280 net/ipv4/devinet.c:2572 devinet_init_net+0x1f7/0x640 net/ipv4/devinet.c:2691 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:2993 __do_sys_unshare kernel/fork.c:3061 [inline] __se_sys_unshare kernel/fork.c:3059 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3059 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+0xe5/0x110 mm/kasan/generic.c:345 kvfree_call_rcu+0x10e/0x7d0 kernel/rcu/tree.c:3577 drop_sysctl_table+0x3c0/0x4e0 fs/proc/proc_sysctl.c:1646 unregister_sysctl_table fs/proc/proc_sysctl.c:1684 [inline] unregister_sysctl_table+0xc2/0x190 fs/proc/proc_sysctl.c:1659 __devinet_sysctl_unregister net/ipv4/devinet.c:2595 [inline] devinet_sysctl_unregister net/ipv4/devinet.c:2623 [inline] inetdev_destroy net/ipv4/devinet.c:324 [inline] inetdev_event+0xcbc/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:2075 call_netdevice_notifiers_extack net/core/dev.c:2087 [inline] call_netdevice_notifiers net/core/dev.c:2101 [inline] unregister_netdevice_many+0x942/0x1760 net/core/dev.c:10936 default_device_exit_batch+0x2fa/0x3c0 net/core/dev.c:11456 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:178 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 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 __call_rcu kernel/rcu/tree.c:3039 [inline] call_rcu+0xb1/0x740 kernel/rcu/tree.c:3114 netlink_release+0xd48/0x1cf0 net/netlink/af_netlink.c:810 __sock_release+0xcd/0x280 net/socket.c:599 sock_close+0x18/0x20 net/socket.c:1258 __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+0x19/0x60 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff8880233e2000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 232 bytes to the right of 2048-byte region [ffff8880233e2000, ffff8880233e2800) The buggy address belongs to the page: page:ffffea00008cf800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x233e0 head:ffffea00008cf800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010442000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880233e2780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880233e2800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880233e2880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880233e2900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880233e2980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================