BUG: spinlock bad magic on CPU#1, kworker/1:0/17 ================================================================== BUG: KASAN: slab-out-of-bounds in task_pid_nr include/linux/sched.h:1366 [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 ffff88806018c888 by task kworker/1:0/17 CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.10.0-rc2-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:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x4c8 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562 task_pid_nr include/linux/sched.h:1366 [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+0x3b/0x110 net/core/sock.c:3036 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+0x933/0x15a0 kernel/workqueue.c:2272 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Allocated by task 14384: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:664 [inline] __register_sysctl_table+0x112/0x1090 fs/proc/proc_sysctl.c:1314 __devinet_sysctl_register+0x156/0x280 net/ipv4/devinet.c:2572 devinet_sysctl_register net/ipv4/devinet.c:2612 [inline] devinet_sysctl_register+0x160/0x230 net/ipv4/devinet.c:2602 inetdev_init+0x225/0x4f0 net/ipv4/devinet.c:276 inetdev_event+0x9c7/0x1530 net/ipv4/devinet.c:1531 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2035 call_netdevice_notifiers_extack net/core/dev.c:2047 [inline] call_netdevice_notifiers net/core/dev.c:2061 [inline] register_netdevice+0x1068/0x1630 net/core/dev.c:9999 wg_newlink+0x526/0xa00 drivers/net/wireguard/device.c:353 __rtnl_newlink+0x108b/0x1740 net/core/rtnetlink.c:3441 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3500 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5562 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88806018c000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 136 bytes to the right of 2048-byte region [ffff88806018c000, ffff88806018c800) The buggy address belongs to the page: page:00000000f2d90eb1 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x60188 head:00000000f2d90eb1 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010042000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88806018c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88806018c800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88806018c880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88806018c900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88806018c980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================