INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?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 Warning: Permanently added 'ci-android-49-kasan-gce-1,10.128.15.228' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 33.799570] [ 33.799923] ===================================== [ 33.800591] [ BUG: bad unlock balance detected! ] [ 33.801249] 4.9.66-gb763480 #103 Not tainted [ 33.801830] ------------------------------------- [ 33.802504] syzkaller548511/3276 is trying to release lock (mrt_lock) at: [ 33.803543] [] ipmr_mfc_seq_stop+0xe4/0x140 [ 33.804382] but there are no more locks to release! [ 33.805043] [ 33.805043] other info that might help us debug this: [ 33.806079] 1 lock held by syzkaller548511/3276: [ 33.806727] #0: (&p->lock){+.+.+.}, at: [] seq_read+0xdd/0x1290 [ 33.807894] [ 33.807894] stack backtrace: [ 33.808493] CPU: 0 PID: 3276 Comm: syzkaller548511 Not tainted 4.9.66-gb763480 #103 [ 33.809521] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.810777] ffff8801c7f07918 ffffffff81d90749 ffffffff849ae878 ffff8801c6ef1800 [ 33.811926] ffffffff834dec54 ffffffff849ae878 ffff8801c6ef2088 ffff8801c7f07948 [ 33.813064] ffffffff812353f4 dffffc0000000000 ffffffff849ae878 00000000ffffffff [ 33.814220] Call Trace: [ 33.814576] [] dump_stack+0xc1/0x128 [ 33.815303] [] ? ipmr_mfc_seq_stop+0xe4/0x140 [ 33.816116] [] print_unlock_imbalance_bug+0x174/0x1a0 [ 33.817036] [] lock_release+0x6f8/0xb80 [ 33.817824] [] ? memcpy+0x45/0x50 [ 33.818528] [] ? ipmr_mfc_seq_stop+0xe4/0x140 [ 33.819359] [] _raw_read_unlock+0x1a/0x50 [ 33.820127] [] ipmr_mfc_seq_stop+0xe4/0x140 [ 33.826124] [] traverse+0x3a7/0x900 [ 33.831384] [] ? seq_buf_alloc+0x80/0x80 [ 33.837072] [] seq_read+0x7ea/0x1290 [ 33.842409] [] ? __lock_acquire+0x629/0x3640 [ 33.848434] [] ? seq_escape+0x200/0x200 [ 33.854024] [] ? seq_escape+0x200/0x200 [ 33.859614] [] proc_reg_read+0xef/0x170 [ 33.865202] [] ? proc_reg_write+0x170/0x170 [ 33.871141] [] __vfs_read+0x103/0x670 [ 33.876553] [] ? default_llseek+0x290/0x290 [ 33.882490] [] ? fsnotify+0x86/0xf30 [ 33.887817] [] ? fsnotify+0xf30/0xf30 [ 33.893236] [] ? avc_policy_seqno+0x9/0x20 [ 33.899086] [] ? selinux_file_permission+0x82/0x460 [ 33.905718] [] ? security_file_permission+0x89/0x1e0 [ 33.912433] [] ? rw_verify_area+0xe5/0x2b0 [ 33.918283] [] vfs_read+0x11e/0x380 [ 33.923524] [] SyS_pread64+0x13f/0x170 [ 33.929025] [] ? SyS_write+0x1b0/0x1b0 [ 33.934528] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 33.941331] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.947876] [] entry_SYSCALL_64_fastpath+0x23/0xc6 executing program