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-upstream-mmots-kasan-gce-9,10.128.15.198' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 41.119364] [ 41.132728] ============================= [ 41.151649] WARNING: suspicious RCU usage [ 41.162280] 4.13.0-mm1+ #7 Not tainted executing program executing program [ 41.166798] ----------------------------- [ 41.176091] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 41.197470] [ 41.197470] other info that might help us debug this: [ 41.197470] executing program executing program executing program [ 41.218721] [ 41.218721] rcu_scheduler_active = 2, debug_locks = 1 [ 41.228570] no locks held by syzkaller833960/12187. [ 41.234585] [ 41.234585] stack backtrace: [ 41.240934] CPU: 1 PID: 12187 Comm: syzkaller833960 Not tainted 4.13.0-mm1+ #7 [ 41.248294] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.257637] Call Trace: [ 41.260224] dump_stack+0x194/0x257 [ 41.263860] ? arch_local_irq_restore+0x53/0x53 executing program executing program [ 41.268554] lockdep_rcu_suspicious+0x123/0x170 [ 41.273225] kvm_dev_ioctl+0x877/0x1840 [ 41.277192] ? finish_task_switch+0x1aa/0x740 [ 41.281697] ? install_new_memslots+0x420/0x420 [ 41.286389] ? avc_has_extended_perms+0x7fa/0x12c0 [ 41.291310] ? lock_downgrade+0x990/0x990 [ 41.295471] ? avc_ss_reset+0x110/0x110 [ 41.299447] ? lock_release+0xd70/0xd70 [ 41.303423] ? __lock_is_held+0xbc/0x140 [ 41.307535] ? check_same_owner+0x320/0x320 [ 41.311867] ? _raw_spin_unlock_irqrestore+0x31/0xba executing program [ 41.316987] ? install_new_memslots+0x420/0x420 [ 41.321662] do_vfs_ioctl+0x1b1/0x1530 [ 41.325564] ? ioctl_preallocate+0x2b0/0x2b0 [ 41.329974] ? selinux_capable+0x40/0x40 [ 41.334052] ? syscall_return_slowpath+0x2b3/0x500 [ 41.339234] ? finish_task_switch+0x4c9/0x740 [ 41.343733] ? security_file_ioctl+0x7d/0xb0 [ 41.348140] ? security_file_ioctl+0x89/0xb0 [ 41.352560] SyS_ioctl+0x8f/0xc0 [ 41.355930] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 41.360679] RIP: 0033:0x44a369 executing program executing program executing program [ 41.363859] RSP: 002b:00007f0df39b5dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 41.371566] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044a369 [ 41.378825] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 [ 41.386088] RBP: 0000000000000082 R08: 00007f0df39b6700 R09: 00007f0df39b6700 [ 41.393349] R10: 00007f0df39b6700 R11: 0000000000000202 R12: 0000000000000000 [ 41.400610] R13: 00000000007ffd1f R14: 00007f0df39b69c0 R15: 0000000000000000 [ 41.408043] [ 41.423747] ============================= [ 41.429665] WARNING: suspicious RCU usage [ 41.435416] 4.13.0-mm1+ #7 Not tainted [ 41.440174] ----------------------------- [ 41.451482] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 41.467714] executing program [ 41.467714] other info that might help us debug this: [ 41.467714] [ 41.486955] [ 41.486955] rcu_scheduler_active = 2, debug_locks = 1 [ 41.495433] no locks held by syzkaller833960/12187. [ 41.502631] [ 41.502631] stack backtrace: [ 41.507303] CPU: 1 PID: 12187 Comm: syzkaller833960 Not tainted 4.13.0-mm1+ #7 [ 41.514653] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.523995] Call Trace: [ 41.526578] dump_stack+0x194/0x257 [ 41.530209] ? arch_local_irq_restore+0x53/0x53 [ 41.534900] lockdep_rcu_suspicious+0x123/0x170 [ 41.539572] kvm_dev_ioctl+0xd21/0x1840 [ 41.543541] ? finish_task_switch+0x1aa/0x740 [ 41.548047] ? install_new_memslots+0x420/0x420 [ 41.552738] ? avc_has_extended_perms+0x7fa/0x12c0 [ 41.557659] ? lock_downgrade+0x990/0x990 [ 41.561817] ? avc_ss_reset+0x110/0x110 [ 41.565795] ? lock_release+0xd70/0xd70 [ 41.569769] ? __lock_is_held+0xbc/0x140 executing program [ 41.573868] ? check_same_owner+0x320/0x320 [ 41.578280] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 41.583394] ? install_new_memslots+0x420/0x420 [ 41.588057] do_vfs_ioctl+0x1b1/0x1530 [ 41.591954] ? ioctl_preallocate+0x2b0/0x2b0 [ 41.596707] ? selinux_capable+0x40/0x40 [ 41.600780] ? syscall_return_slowpath+0x2b3/0x500 [ 41.605699] ? finish_task_switch+0x4c9/0x740 [ 41.610203] ? security_file_ioctl+0x7d/0xb0 [ 41.614603] ? security_file_ioctl+0x89/0xb0 [ 41.619013] SyS_ioctl+0x8f/0xc0 [ 41.622384] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 41.627130] RIP: 0033:0x44a369 [ 41.630310] RSP: 002b:00007f0df39b5dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 41.638013] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044a369 [ 41.645629] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 [ 41.652892] RBP: 0000000000000082 R08: 00007f0df39b6700 R09: 00007f0df39b6700 [ 41.660503] R10: 00007f0df39b6700 R11: 0000000000000202 R12: 0000000000000000 [ 41.667767] R13: 00000000007ffd1f R14: 00007f0df39b69c0 R15: 0000000000000000 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program