========================= WARNING: held lock freed! IPv6: ADDRCONF(NETDEV_UP): bond8: link is not ready 4.14.180-syzkaller #0 Not tainted ------------------------- syz-executor.3/6667 is freeing memory ffff8880694c2200-ffff8880694c29ff, with a lock still held there! (sk_lock-AF_PPPOX){+.+.}, at: [] lock_sock include/net/sock.h:1467 [inline] (sk_lock-AF_PPPOX){+.+.}, at: [] pppol2tp_release+0x49/0x2f0 net/l2tp/l2tp_ppp.c:476 8021q: adding VLAN 0 to HW filter on device bond8 2 locks held by syz-executor.3/6667: #0: (&sb->s_type->i_mutex_key#13){+.+.}, at: [] inode_lock include/linux/fs.h:719 [inline] #0: (&sb->s_type->i_mutex_key#13){+.+.}, at: [] __sock_release+0x86/0x2b0 net/socket.c:601 #1: device bond8 entered promiscuous mode (sk_lock-AF_PPPOX){+.+.}, at: [] lock_sock include/net/sock.h:1467 [inline] (sk_lock-AF_PPPOX){+.+.}, at: [] pppol2tp_release+0x49/0x2f0 net/l2tp/l2tp_ppp.c:476 stack backtrace: device bond8 left promiscuous mode CPU: 0 PID: 6667 Comm: syz-executor.3 Not tainted 4.14.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 print_freed_lock_bug kernel/locking/lockdep.c:4463 [inline] debug_check_no_locks_freed.cold+0x9c/0xa8 kernel/locking/lockdep.c:4496 kfree+0xae/0x260 mm/slab.c:3812 sk_prot_free net/core/sock.c:1504 [inline] __sk_destruct+0x4f6/0x640 net/core/sock.c:1581 sk_destruct+0x97/0xc0 net/core/sock.c:1596 __sk_free+0x4c/0x220 net/core/sock.c:1604 sk_free+0x2b/0x40 net/core/sock.c:1615 sock_put include/net/sock.h:1658 [inline] pppol2tp_release+0x26a/0x2f0 net/l2tp/l2tp_ppp.c:493 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x790 fs/file_table.c:210 task_work_run+0x113/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1d6/0x220 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x416421 RSP: 002b:00007ffc1f7f09f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000416421 RDX: 0000000000000000 RSI: 0000000000790480 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffc1f7f0ae0 R11: 0000000000000293 R12: 00000000007906b0 R13: 00000000001f0aa1 R14: ffffffffffffffff R15: 000000000078bf0c ================================================================== BUG: KASAN: use-after-free in perf_trace_lock_acquire+0x3e5/0x4b0 include/trace/events/lock.h:13 Read of size 8 at addr ffff8880694c22b8 by task syz-executor.3/6667 CPU: 0 PID: 6667 Comm: syz-executor.3 Not tainted 4.14.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393 perf_trace_lock_acquire+0x3e5/0x4b0 include/trace/events/lock.h:13 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x2b8/0x3f0 kernel/locking/lockdep.c:3997 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:176 spin_lock_bh include/linux/spinlock.h:322 [inline] release_sock+0x1b/0x1b0 net/core/sock.c:2780 pppol2tp_release+0x219/0x2f0 net/l2tp/l2tp_ppp.c:495 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x790 fs/file_table.c:210 task_work_run+0x113/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1d6/0x220 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x416421 RSP: 002b:00007ffc1f7f09f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000416421 RDX: 0000000000000000 RSI: 0000000000790480 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffc1f7f0ae0 R11: 0000000000000293 R12: 00000000007906b0 R13: 00000000001f0aa1 R14: ffffffffffffffff R15: 000000000078bf0c Allocated by task 6687: save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15b/0x7c0 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] sk_prot_alloc+0x164/0x290 net/core/sock.c:1467 sk_alloc+0x36/0xd60 net/core/sock.c:1521 pppol2tp_create+0x2d/0x1e0 net/l2tp/l2tp_ppp.c:534 pppox_create+0xf2/0x210 drivers/net/ppp/pppox.c:134 __sock_create+0x2f2/0x620 net/socket.c:1275 sock_create net/socket.c:1315 [inline] SYSC_socket net/socket.c:1345 [inline] SyS_socket+0xd2/0x170 net/socket.c:1325 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 6667: save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcb/0x260 mm/slab.c:3815 sk_prot_free net/core/sock.c:1504 [inline] __sk_destruct+0x4f6/0x640 net/core/sock.c:1581 sk_destruct+0x97/0xc0 net/core/sock.c:1596 __sk_free+0x4c/0x220 net/core/sock.c:1604 sk_free+0x2b/0x40 net/core/sock.c:1615 sock_put include/net/sock.h:1658 [inline] pppol2tp_release+0x26a/0x2f0 net/l2tp/l2tp_ppp.c:493 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x790 fs/file_table.c:210 task_work_run+0x113/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1d6/0x220 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8880694c2200 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 184 bytes inside of 2048-byte region [ffff8880694c2200, ffff8880694c2a00) The buggy address belongs to the page: page:ffffea0001a53080 count:1 mapcount:0 mapping:ffff8880694c2200 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff8880694c2200 0000000000000000 0000000100000003 raw: ffffea00029046a0 ffffea000165a720 ffff88812fe54c40 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880694c2180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880694c2200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880694c2280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880694c2300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880694c2380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================