random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) ===================================== [ BUG: bad unlock balance detected! ] 4.4.104-ged884eb #2 Not tainted ------------------------------------- syzkaller823721/3340 is trying to release lock (mrt_lock) at: [] ipmr_mfc_seq_stop+0xd0/0x110 /syzkaller/managers/android-44-kasan-gce/kernel/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 syzkaller823721/3340: #0: (&p->lock){+.+.+.}, at: [] seq_read+0xd5/0x1270 /syzkaller/managers/android-44-kasan-gce/kernel/fs/seq_file.c:178 stack backtrace: CPU: 0 PID: 3340 Comm: syzkaller823721 Not tainted 4.4.104-ged884eb #2 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 94ea5097a8d8878e ffff8801d616f940 ffffffff81cc9b0f ffffffff84769898 ffff8800b95edf00 ffff8801d616f970 ffffffff81226a84 dffffc0000000000 ffffffff84769898 00000000ffffffff ffff8800b95ee770 Call Trace: [] __dump_stack /syzkaller/managers/android-44-kasan-gce/kernel/lib/dump_stack.c:15 [inline] [] dump_stack+0x8e/0xcf /syzkaller/managers/android-44-kasan-gce/kernel/lib/dump_stack.c:51 [] print_unlock_imbalance_bug+0x174/0x1a0 /syzkaller/managers/android-44-kasan-gce/kernel/kernel/locking/lockdep.c:3266 [] __lock_release /syzkaller/managers/android-44-kasan-gce/kernel/kernel/locking/lockdep.c:3408 [inline] [] lock_release+0x72a/0xc10 /syzkaller/managers/android-44-kasan-gce/kernel/kernel/locking/lockdep.c:3611 [] __raw_read_unlock /syzkaller/managers/android-44-kasan-gce/kernel/include/linux/rwlock_api_smp.h:225 [inline] [] _raw_read_unlock+0x1a/0x50 /syzkaller/managers/android-44-kasan-gce/kernel/kernel/locking/spinlock.c:255 [] ipmr_mfc_seq_stop+0xd0/0x110 /syzkaller/managers/android-44-kasan-gce/kernel/net/ipv6/ip6mr.c:553 [] traverse+0x347/0x950 /syzkaller/managers/android-44-kasan-gce/kernel/fs/seq_file.c:148 [] seq_read+0x76b/0x1270 /syzkaller/managers/android-44-kasan-gce/kernel/fs/seq_file.c:195 [] proc_reg_read+0xbc/0x180 /syzkaller/managers/android-44-kasan-gce/kernel/fs/proc/inode.c:202 [] __vfs_read+0xda/0x3e0 /syzkaller/managers/android-44-kasan-gce/kernel/fs/read_write.c:432 [] vfs_read+0xe1/0x340 /syzkaller/managers/android-44-kasan-gce/kernel/fs/read_write.c:454 [] SYSC_pread64 /syzkaller/managers/android-44-kasan-gce/kernel/fs/read_write.c:607 [inline] [] SyS_pread64+0x11e/0x150 /syzkaller/managers/android-44-kasan-gce/kernel/fs/read_write.c:594 [] entry_SYSCALL_64_fastpath+0x16/0x76