===================================== [ BUG: bad unlock balance detected! ] 4.9.66-g38884cc #102 Not tainted ------------------------------------- syzkaller194966/3348 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 syzkaller194966/3348: #0: (&p->lock){+.+.+.}, at: [] seq_read+0xdd/0x1290 fs/seq_file.c:178 stack backtrace: CPU: 0 PID: 3348 Comm: syzkaller194966 Not tainted 4.9.66-g38884cc #102 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801ca7a7918 ffffffff81d90429 ffffffff849ae878 ffff8801c9c26000 ffffffff834dec54 ffffffff849ae878 ffff8801c9c26888 ffff8801ca7a7948 ffffffff812350e4 dffffc0000000000 ffffffff849ae878 00000000ffffffff Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_unlock_imbalance_bug+0x174/0x1a0 kernel/locking/lockdep.c:3398 [] __lock_release kernel/locking/lockdep.c:3540 [inline] [] lock_release+0x6f8/0xb80 kernel/locking/lockdep.c:3775 [] __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/0x1290 fs/seq_file.c:195 [] proc_reg_read+0xef/0x170 fs/proc/inode.c:202 [] __vfs_read+0x103/0x670 fs/read_write.c:452 [] vfs_read+0x11e/0x380 fs/read_write.c:475 [] SYSC_pread64 fs/read_write.c:629 [inline] [] SyS_pread64+0x13f/0x170 fs/read_write.c:616 [] entry_SYSCALL_64_fastpath+0x23/0xc6