BUG: spinlock bad magic on CPU#1, kworker/1:0/19 ================================================================== BUG: KASAN: slab-out-of-bounds in task_pid_nr include/linux/sched.h:1408 [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 ffff888079cb38e0 by task kworker/1:0/19 CPU: 1 PID: 19 Comm: kworker/1:0 Not tainted 5.11.0-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:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413 task_pid_nr include/linux/sched.h:1408 [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:3049 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/0x15f0 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:296 Allocated by task 14809: 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:401 [inline] ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:682 [inline] __register_sysctl_table+0x112/0x1090 fs/proc/proc_sysctl.c:1314 __devinet_sysctl_register+0x156/0x280 net/ipv4/devinet.c:2571 devinet_init_net+0x228/0x640 net/ipv4/devinet.c:2694 ops_init+0xaf/0x470 net/core/net_namespace.c:152 setup_net+0x2de/0x850 net/core/net_namespace.c:342 copy_net_ns+0x31e/0x760 net/core/net_namespace.c:483 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:2957 __do_sys_unshare kernel/fork.c:3025 [inline] __se_sys_unshare kernel/fork.c:3023 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3023 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xc5/0xf0 mm/kasan/generic.c:344 __call_rcu kernel/rcu/tree.c:2965 [inline] call_rcu+0xbb/0x700 kernel/rcu/tree.c:3038 netlink_release+0xd43/0x1cf0 net/netlink/af_netlink.c:802 __sock_release+0xcd/0x280 net/socket.c:597 sock_close+0x18/0x20 net/socket.c:1256 __fput+0x283/0x920 fs/file_table.c:280 task_work_run+0xdd/0x190 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:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xc5/0xf0 mm/kasan/generic.c:344 __call_rcu kernel/rcu/tree.c:2965 [inline] call_rcu+0xbb/0x700 kernel/rcu/tree.c:3038 netlink_release+0xd43/0x1cf0 net/netlink/af_netlink.c:802 __sock_release+0xcd/0x280 net/socket.c:597 sock_close+0x18/0x20 net/socket.c:1256 __fput+0x283/0x920 fs/file_table.c:280 task_work_run+0xdd/0x190 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:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff888079cb3000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 224 bytes to the right of 2048-byte region [ffff888079cb3000, ffff888079cb3800) The buggy address belongs to the page: page:00000000a901d017 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888079cb1000 pfn:0x79cb0 head:00000000a901d017 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 ffffea00006d6608 ffffea0001672408 ffff888010042000 raw: ffff888079cb1000 0000000000080007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888079cb3780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888079cb3800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888079cb3880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888079cb3900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888079cb3980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================