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-kasan-gce-2,10.128.0.41' (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 syzkaller login: [ 46.278025] hrtimer: interrupt took 17180 ns executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.878501] [ 47.882170] ============================= [ 47.898359] WARNING: suspicious RCU usage [ 47.908720] 4.13.0-rc5+ #37 Not tainted [ 47.913683] ----------------------------- executing program [ 47.928664] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 47.952702] [ 47.952702] other info that might help us debug this: [ 47.952702] [ 47.962396] [ 47.962396] rcu_scheduler_active = 2, debug_locks = 1 [ 47.969357] no locks held by syzkaller806657/4632. [ 47.974529] [ 47.974529] stack backtrace: [ 47.979140] CPU: 0 PID: 4632 Comm: syzkaller806657 Not tainted 4.13.0-rc5+ #37 [ 47.986478] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.995808] Call Trace: [ 47.998369] dump_stack+0x194/0x257 [ 48.001968] ? arch_local_irq_restore+0x53/0x53 [ 48.006618] lockdep_rcu_suspicious+0x123/0x170 [ 48.011259] kvm_dev_ioctl+0x877/0x1840 [ 48.015196] ? lock_downgrade+0x990/0x990 [ 48.019319] ? install_new_memslots+0x420/0x420 [ 48.023970] ? avc_has_extended_perms+0x7fa/0x12c0 [ 48.028871] ? find_held_lock+0x35/0x1d0 [ 48.032910] ? avc_ss_reset+0x110/0x110 [ 48.036849] ? lock_downgrade+0x990/0x990 [ 48.040964] ? lock_release+0xa40/0xa40 [ 48.044914] ? __lock_is_held+0xb6/0x140 [ 48.048966] ? check_same_owner+0x320/0x320 [ 48.053258] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 48.058336] ? install_new_memslots+0x420/0x420 [ 48.062982] do_vfs_ioctl+0x1b1/0x1520 [ 48.066844] ? ioctl_preallocate+0x2b0/0x2b0 [ 48.071221] ? selinux_capable+0x40/0x40 [ 48.075259] ? syscall_return_slowpath+0x22f/0x450 [ 48.080161] ? security_file_ioctl+0x7d/0xb0 [ 48.084533] ? security_file_ioctl+0x89/0xb0 [ 48.088910] SyS_ioctl+0x8f/0xc0 [ 48.092254] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 48.096980] RIP: 0033:0x446419 [ 48.100151] RSP: 002b:00007f7fb6a38dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 48.107832] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446419 [ 48.115078] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 [ 48.122314] RBP: 0000000000000086 R08: 00007f7fb6a39700 R09: 00007f7fb6a39700 executing program executing program executing program executing program executing program executing program executing program [ 48.129569] R10: 00007f7fb6a39700 R11: 0000000000000202 R12: 0000000000000000 [ 48.136804] R13: 00007ffde4be2e8f R14: 00007f7fb6a399c0 R15: 0000000000000000 [ 48.144229] [ 48.145894] ============================= [ 48.152463] WARNING: suspicious RCU usage [ 48.158403] 4.13.0-rc5+ #37 Not tainted [ 48.164555] ----------------------------- [ 48.172606] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 48.181212] [ 48.181212] other info that might help us debug this: [ 48.181212] [ 48.189995] [ 48.189995] rcu_scheduler_active = 2, debug_locks = 1 [ 48.201686] no locks held by syzkaller806657/4632. [ 48.211180] [ 48.211180] stack backtrace: executing program [ 48.228473] CPU: 0 PID: 4632 Comm: syzkaller806657 Not tainted 4.13.0-rc5+ #37 [ 48.235824] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.245156] Call Trace: [ 48.247714] dump_stack+0x194/0x257 [ 48.251313] ? arch_local_irq_restore+0x53/0x53 [ 48.255961] lockdep_rcu_suspicious+0x123/0x170 [ 48.260600] kvm_dev_ioctl+0xd21/0x1840 [ 48.264550] ? lock_downgrade+0x990/0x990 [ 48.268673] ? install_new_memslots+0x420/0x420 [ 48.273332] ? avc_has_extended_perms+0x7fa/0x12c0 executing program executing program [ 48.278226] ? find_held_lock+0x35/0x1d0 [ 48.282261] ? avc_ss_reset+0x110/0x110 [ 48.286199] ? lock_downgrade+0x990/0x990 [ 48.290316] ? lock_release+0xa40/0xa40 [ 48.294266] ? __lock_is_held+0xb6/0x140 [ 48.298479] ? check_same_owner+0x320/0x320 [ 48.302772] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 48.307853] ? install_new_memslots+0x420/0x420 [ 48.312491] do_vfs_ioctl+0x1b1/0x1520 [ 48.316354] ? ioctl_preallocate+0x2b0/0x2b0 [ 48.320736] ? selinux_capable+0x40/0x40 [ 48.324774] ? syscall_return_slowpath+0x22f/0x450 [ 48.329678] ? security_file_ioctl+0x7d/0xb0 [ 48.334051] ? security_file_ioctl+0x89/0xb0 [ 48.338429] SyS_ioctl+0x8f/0xc0 [ 48.341765] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 48.346486] RIP: 0033:0x446419 [ 48.349641] RSP: 002b:00007f7fb6a38dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 48.357313] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446419 [ 48.364569] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 [ 48.371808] RBP: 0000000000000086 R08: 00007f7fb6a39700 R09: 00007f7fb6a39700 executing program executing program executing program executing program [ 48.379056] R10: 00007f7fb6a39700 R11: 0000000000000202 R12: 0000000000000000 [ 48.386306] R13: 00007ffde4be2e8f R14: 00007f7fb6a399c0 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