INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-upstream-mmots-kasan-gce-6,10.128.0.2' (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 syzkaller login: [ 41.916225] [ 41.921841] ============================= [ 41.929973] WARNING: suspicious RCU usage [ 41.937147] 4.13.0-mm1+ #7 Not tainted [ 41.945139] [ 41.945142] ============================= executing program executing program executing program [ 41.945145] WARNING: suspicious RCU usage [ 41.945149] 4.13.0-mm1+ #7 Not tainted [ 41.945151] ----------------------------- [ 41.945155] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 41.945158] [ 41.945158] other info that might help us debug this: [ 41.945158] executing program executing program executing program executing program executing program executing program [ 41.945161] [ 41.945161] rcu_scheduler_active = 2, debug_locks = 1 [ 41.945165] no locks held by syzkaller901957/3155. [ 41.945167] [ 41.945167] stack backtrace: [ 41.945172] CPU: 0 PID: 3155 Comm: syzkaller901957 Not tainted 4.13.0-mm1+ #7 [ 41.945176] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.945178] Call Trace: [ 41.945192] dump_stack+0x194/0x257 [ 41.945204] ? arch_local_irq_restore+0x53/0x53 [ 41.945225] lockdep_rcu_suspicious+0x123/0x170 [ 41.945236] kvm_dev_ioctl+0xd21/0x1840 [ 41.945252] ? install_new_memslots+0x420/0x420 [ 41.945274] ? avc_has_extended_perms+0x7fa/0x12c0 [ 41.945279] ? lock_downgrade+0x990/0x990 executing program executing program executing program executing program executing program [ 41.945295] ? avc_ss_reset+0x110/0x110 [ 41.945306] ? lock_release+0xd70/0xd70 [ 41.945316] ? __lock_is_held+0xbc/0x140 [ 41.945349] ? check_same_owner+0x320/0x320 [ 41.945358] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 41.945373] ? install_new_memslots+0x420/0x420 [ 41.945381] do_vfs_ioctl+0x1b1/0x1530 [ 41.945393] ? ioctl_preallocate+0x2b0/0x2b0 [ 41.945403] ? selinux_capable+0x40/0x40 executing program executing program executing program executing program executing program [ 41.945416] ? lockdep_invariant_state+0xdb/0x120 [ 41.945424] ? syscall_return_slowpath+0x2b3/0x500 [ 41.945429] ? finish_task_switch+0x4c9/0x740 [ 41.945442] ? security_file_ioctl+0x7d/0xb0 [ 41.945446] ? security_file_ioctl+0x89/0xb0 executing program executing program executing program executing program executing program executing program [ 41.945457] SyS_ioctl+0x8f/0xc0 [ 41.945468] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 41.945473] RIP: 0033:0x446209 [ 41.945477] RSP: 002b:00007fcee84c4dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 41.945484] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 executing program [ 41.945487] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 41.945490] RBP: 0000000000000082 R08: 00007fcee84c5700 R09: 00007fcee84c5700 [ 41.945494] R10: 00007fcee84c5700 R11: 0000000000000246 R12: 0000000000000000 [ 41.945497] R13: 00007ffdcb9b867f R14: 00007fcee84c59c0 R15: 0000000000000000 [ 42.325404] ----------------------------- executing program executing program executing program executing program executing program [ 42.331006] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 42.341373] [ 42.341373] other info that might help us debug this: [ 42.341373] [ 42.353199] [ 42.353199] rcu_scheduler_active = 2, debug_locks = 1 [ 42.366815] no locks held by syzkaller901957/3138. [ 42.374129] [ 42.374129] stack backtrace: executing program executing program [ 42.384788] CPU: 0 PID: 3138 Comm: syzkaller901957 Not tainted 4.13.0-mm1+ #7 [ 42.392048] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.401387] Call Trace: [ 42.403952] dump_stack+0x194/0x257 [ 42.407562] ? arch_local_irq_restore+0x53/0x53 [ 42.412215] lockdep_rcu_suspicious+0x123/0x170 [ 42.416861] kvm_dev_ioctl+0x877/0x1840 [ 42.420817] ? install_new_memslots+0x420/0x420 [ 42.425476] ? avc_has_extended_perms+0x7fa/0x12c0 [ 42.430376] ? lock_downgrade+0x990/0x990 executing program [ 42.434504] ? avc_ss_reset+0x110/0x110 [ 42.438456] ? lock_release+0xd70/0xd70 [ 42.442409] ? __lock_is_held+0xbc/0x140 [ 42.446468] ? check_same_owner+0x320/0x320 [ 42.450757] ? rcu_pm_notify+0xc0/0xc0 [ 42.454625] ? install_new_memslots+0x420/0x420 [ 42.459263] do_vfs_ioctl+0x1b1/0x1530 [ 42.463126] ? ioctl_preallocate+0x2b0/0x2b0 [ 42.467510] ? selinux_capable+0x40/0x40 [ 42.471542] ? __lock_acquire+0x1651/0x4620 [ 42.475836] ? lockdep_invariant_state+0xdb/0x120 [ 42.480649] ? syscall_return_slowpath+0x2b3/0x500 executing program [ 42.485548] ? finish_task_switch+0x1aa/0x740 [ 42.490019] ? security_file_ioctl+0x7d/0xb0 [ 42.494396] ? security_file_ioctl+0x89/0xb0 [ 42.498779] SyS_ioctl+0x8f/0xc0 [ 42.502130] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 42.506853] RIP: 0033:0x446209 [ 42.510012] RSP: 002b:00007fcee84c4dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 42.517692] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 42.524931] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 executing program executing program executing program executing program executing program executing program [ 42.532171] RBP: 0000000000000082 R08: 00007fcee84c5700 R09: 00007fcee84c5700 [ 42.539410] R10: 00007fcee84c5700 R11: 0000000000000246 R12: 0000000000000000 [ 42.546649] R13: 00007ffdcb9b867f R14: 00007fcee84c59c0 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 executing program executing program executing program executing program executing program executing program executing program executing program