===================================== [ BUG: bad unlock balance detected! ] 4.4.107-g610c835 #12 Not tainted ------------------------------------- syzkaller520317/3322 is trying to release lock (mrt_lock) at: [] ipmr_mfc_seq_stop+0xe4/0x140 net/ipv6/ip6mr.c:553 but there are no more locks to release! other info that might help us debug this: 1 lock held by syzkaller520317/3322: #0: (&p->lock){+.+.+.}, at: [] seq_read+0xdd/0x1270 fs/seq_file.c:178 stack backtrace: CPU: 0 PID: 3322 Comm: syzkaller520317 Not tainted 4.4.107-g610c835 #12 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 ed73fe0f5c099067 ffff8801d0f8f910 ffffffff81d0457d ffffffff8476ab98 ffff8800b4d2df00 ffffffff833c77d4 ffffffff8476ab98 ffff8800b4d2e748 ffff8801d0f8f940 ffffffff812301a4 dffffc0000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x124 lib/dump_stack.c:51 [] print_unlock_imbalance_bug+0x174/0x1a0 kernel/locking/lockdep.c:3266 [] __lock_release kernel/locking/lockdep.c:3408 [inline] [] lock_release+0x72a/0xc10 kernel/locking/lockdep.c:3611 [] __raw_read_unlock include/linux/rwlock_api_smp.h:225 [inline] [] _raw_read_unlock+0x1a/0x50 kernel/locking/spinlock.c:255 [] ipmr_mfc_seq_stop+0xe4/0x140 net/ipv6/ip6mr.c:553 [] traverse+0x3a7/0x900 fs/seq_file.c:148 [] seq_read+0x7ea/0x1270 fs/seq_file.c:195 [] proc_reg_read+0xef/0x170 fs/proc/inode.c:202 [] __vfs_read+0x103/0x440 fs/read_write.c:432 [] vfs_read+0x123/0x3a0 fs/read_write.c:454 [] SYSC_pread64 fs/read_write.c:607 [inline] [] SyS_pread64+0x13f/0x170 fs/read_write.c:594 [] entry_SYSCALL_64_fastpath+0x16/0x76