===================================== [ BUG: bad unlock balance detected! ] 4.4.111-g7902639 #25 Not tainted ------------------------------------- syz-executor3/9893 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 syz-executor3/9893: #0: (&p->lock){+.+.+.}, at: [] seq_read+0xdd/0x1270 fs/seq_file.c:178 stack backtrace: CPU: 0 PID: 9893 Comm: syz-executor3 Not tainted 4.4.111-g7902639 #25 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 84bb51e77c7f7d99 ffff8801d7a279f8 ffffffff81d0509d ffffffff84770798 ffff8801d7e6af80 ffffffff833c9304 ffffffff84770798 ffff8801d7e6b7c8 ffff8801d7a27a28 ffffffff81232374 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 device syz0 entered promiscuous mode [] ipmr_mfc_seq_stop+0xe4/0x140 net/ipv6/ip6mr.c:553 [] seq_read+0xa80/0x1270 fs/seq_file.c:283 [] 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+0x16/0x92 device syz0 entered promiscuous mode device syz4 entered promiscuous mode device syz2 entered promiscuous mode device syz0 entered promiscuous mode device syz5 entered promiscuous mode device syz4 entered promiscuous mode device syz0 entered promiscuous mode device syz2 entered promiscuous mode device syz5 entered promiscuous 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