[ 15.848521] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.361651] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.804881] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 22.732200] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) [ 31.056493] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available) Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. [ 36.448851] random: sshd: uninitialized urandom read (32 bytes read, 127 bits of entropy available) [ 36.463885] random: nonblocking pool is initialized executing program [ 36.563324] [ 36.564959] ===================================== [ 36.569764] [ BUG: bad unlock balance detected! ] [ 36.574571] 4.4.107-g610c835 #4 Not tainted [ 36.578855] ------------------------------------- [ 36.583662] syzkaller189663/3339 is trying to release lock (mrt_lock) at: [ 36.590786] [] ipmr_mfc_seq_stop+0xe4/0x140 [ 36.596635] but there are no more locks to release! [ 36.601610] [ 36.601610] other info that might help us debug this: [ 36.608239] 1 lock held by syzkaller189663/3339: [ 36.612958] #0: (&p->lock){+.+.+.}, at: [] seq_read+0xdd/0x1270 [ 36.621276] [ 36.621276] stack backtrace: [ 36.625737] CPU: 0 PID: 3339 Comm: syzkaller189663 Not tainted 4.4.107-g610c835 #4 [ 36.633406] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.642723] 0000000000000000 12de7db18af79aa5 ffff8801d0b6f860 ffffffff81d0457d [ 36.650664] ffffffff8476ab98 ffff8801d0c60000 ffffffff833c77d4 ffffffff8476ab98 [ 36.658602] ffff8801d0c60848 ffff8801d0b6f890 ffffffff812301a4 dffffc0000000000 [ 36.666547] Call Trace: [ 36.669101] [] dump_stack+0xc1/0x124 [ 36.674430] [] ? ipmr_mfc_seq_stop+0xe4/0x140 [ 36.680540] [] print_unlock_imbalance_bug+0x174/0x1a0 [ 36.687344] [] lock_release+0x72a/0xc10 [ 36.692932] [] ? memcpy+0x45/0x50 [ 36.697999] [] ? ipmr_mfc_seq_stop+0xe4/0x140 [ 36.704108] [] _raw_read_unlock+0x1a/0x50 [ 36.709868] [] ipmr_mfc_seq_stop+0xe4/0x140 [ 36.715804] [] traverse+0x3a7/0x900 [ 36.721046] [] ? seq_buf_alloc+0x80/0x80 [ 36.726717] [] ? wake_up_q+0xbe/0x130 [ 36.732133] [] seq_read+0x7ea/0x1270 [ 36.737458] [] ? seq_lseek+0x3c0/0x3c0 [ 36.742960] [] ? do_futex+0x3e3/0x1670 [ 36.748462] [] ? seq_lseek+0x3c0/0x3c0 [ 36.753965] [] proc_reg_read+0xef/0x170 [ 36.759552] [] ? proc_reg_write+0x170/0x170 [ 36.765487] [] __vfs_read+0x103/0x440 [ 36.770898] [] ? exit_robust_list+0x240/0x240 [ 36.777007] [] ? vfs_iter_write+0x2d0/0x2d0 [ 36.782938] [] ? fsnotify+0x5ad/0xee0 [ 36.788349] [] ? fsnotify+0xee0/0xee0 [ 36.793763] [] ? avc_policy_seqno+0x9/0x20 [ 36.799611] [] ? selinux_file_permission+0x348/0x460 [ 36.806328] [] ? security_file_permission+0x89/0x1e0 [ 36.813045] [] ? rw_verify_area+0x100/0x2f0 [ 36.818982] [] vfs_read+0x123/0x3a0 [ 36.824224] [] SyS_pread64+0x13f/0x170 [ 36.829736] [] ? SyS_write+0x1b0/0x1b0 [ 36.835237] [] ? sock_common_setsockopt+0xd0/0xd0 [ 36.841692] [] ? scm_detach_fds_compat+0x3c0/0x3c0 [ 36.848235] [] ? vmacache_update+0xfe/0x130 [ 36.854172] [] sys32_pread+0x39/0x50 executing program [ 36.859497] [] ? sys32_waitpid+0x30/0x30 [ 36.865170] [] do_fast_syscall_32+0x314/0x890 [ 36.871461] [] sysenter_flags_fixed+0xd/0x17