INFO: trying to register non-static key. The code is fine but needs lockdep annotation, or maybe you didn't initialize this object before use? turning off the locking correctness validator. CPU: 1 PID: 26676 Comm: kworker/1:30 Not tainted 5.14.0-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:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 assign_lock_key kernel/locking/lockdep.c:939 [inline] register_lock_class+0xf79/0x10c0 kernel/locking/lockdep.c:1251 __lock_acquire+0x105/0x54a0 kernel/locking/lockdep.c:4894 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:368 [inline] lock_sock_nested+0x40/0x120 net/core/sock.c:3183 l2cap_sock_teardown_cb+0xa1/0x660 net/bluetooth/l2cap_sock.c:1528 l2cap_chan_del+0xbc/0xa80 net/bluetooth/l2cap_core.c:622 l2cap_chan_close+0x1b9/0xaf0 net/bluetooth/l2cap_core.c:825 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:436 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ================================================================== BUG: KASAN: slab-out-of-bounds in l2cap_sock_teardown_cb+0x5c9/0x660 net/bluetooth/l2cap_sock.c:1530 Read of size 8 at addr ffff8880792dd4d0 by task kworker/1:30/26676 CPU: 1 PID: 26676 Comm: kworker/1:30 Not tainted 5.14.0-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:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 l2cap_sock_teardown_cb+0x5c9/0x660 net/bluetooth/l2cap_sock.c:1530 l2cap_chan_del+0xbc/0xa80 net/bluetooth/l2cap_core.c:622 l2cap_chan_close+0x1b9/0xaf0 net/bluetooth/l2cap_core.c:825 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:436 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 17273: 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:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa4/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] ops_init+0xfb/0x470 net/core/net_namespace.c:130 setup_net+0x40f/0xa30 net/core/net_namespace.c:326 copy_net_ns+0x319/0x760 net/core/net_namespace.c:470 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3078 __do_sys_unshare kernel/fork.c:3152 [inline] __se_sys_unshare kernel/fork.c:3150 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3150 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 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+0xe9/0x110 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1353 __queue_work+0x5ca/0xee0 kernel/workqueue.c:1519 queue_work_on+0xee/0x110 kernel/workqueue.c:1546 queue_work include/linux/workqueue.h:502 [inline] afs_queue_server_manager fs/afs/server.c:601 [inline] afs_purge_servers+0xea/0x340 fs/afs/server.c:615 afs_net_exit+0x16d/0x320 fs/afs/main.c:157 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:591 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1353 __queue_work+0x5ca/0xee0 kernel/workqueue.c:1519 queue_work_on+0xee/0x110 kernel/workqueue.c:1546 queue_work include/linux/workqueue.h:502 [inline] afs_queue_cell_manager+0x64/0xe0 fs/afs/cell.c:518 afs_cell_purge+0x105/0x2b0 fs/afs/cell.c:959 afs_net_exit+0x165/0x320 fs/afs/main.c:156 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:591 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff8880792dd000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1232 bytes inside of 2048-byte region [ffff8880792dd000, ffff8880792dd800) The buggy address belongs to the page: page:ffffea0001e4b600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x792d8 head:ffffea0001e4b600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00021b5e00 0000000300000003 ffff888010c42000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 13394, ts 1168969061230, free_ts 1168962689628 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4168 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5390 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2291 alloc_slab_page mm/slub.c:1691 [inline] allocate_slab+0x32e/0x4b0 mm/slub.c:1831 new_slab mm/slub.c:1894 [inline] new_slab_objects mm/slub.c:2640 [inline] ___slab_alloc+0x473/0x7b0 mm/slub.c:2803 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2843 slab_alloc_node mm/slub.c:2925 [inline] slab_alloc mm/slub.c:2967 [inline] __kmalloc+0x312/0x330 mm/slub.c:4111 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] __register_sysctl_table+0x112/0x1090 fs/proc/proc_sysctl.c:1318 __devinet_sysctl_register+0x156/0x280 net/ipv4/devinet.c:2577 devinet_sysctl_register net/ipv4/devinet.c:2617 [inline] devinet_sysctl_register+0x160/0x230 net/ipv4/devinet.c:2607 inetdev_init+0x269/0x570 net/ipv4/devinet.c:276 inetdev_event+0xa87/0x15d0 net/ipv4/devinet.c:1530 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1996 call_netdevice_notifiers_extack net/core/dev.c:2008 [inline] call_netdevice_notifiers net/core/dev.c:2022 [inline] register_netdevice+0x1075/0x1500 net/core/dev.c:10326 register_netdev+0x2d/0x50 net/core/dev.c:10419 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1346 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1397 free_unref_page_prepare mm/page_alloc.c:3332 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3411 unfreeze_partials+0x16c/0x1b0 mm/slub.c:2421 put_cpu_partial+0x13d/0x230 mm/slub.c:2457 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x95/0xb0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:2959 [inline] slab_alloc mm/slub.c:2967 [inline] kmem_cache_alloc+0x285/0x4a0 mm/slub.c:2972 prepare_kernel_cred+0x27/0x890 kernel/cred.c:724 call_usermodehelper_exec_async+0x10e/0x580 kernel/umh.c:91 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff8880792dd380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880792dd400: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880792dd480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880792dd500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880792dd580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================