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-8,10.128.15.197' (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 syzkaller login: [ 33.235686] [ 33.243446] ============================= [ 33.271106] WARNING: suspicious RCU usage executing program [ 33.284328] 4.13.0+ #70 Not tainted [ 33.288903] ----------------------------- executing program executing program executing program executing program executing program [ 33.342766] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 33.380101] [ 33.380101] other info that might help us debug this: [ 33.380101] executing program executing program executing program executing program executing program executing program [ 33.433125] [ 33.433125] rcu_scheduler_active = 2, debug_locks = 1 [ 33.457972] no locks held by syzkaller577694/5018. executing program [ 33.515576] [ 33.515576] stack backtrace: [ 33.528702] CPU: 0 PID: 5018 Comm: syzkaller577694 Not tainted 4.13.0+ #70 [ 33.535756] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.545103] Call Trace: [ 33.547708] dump_stack+0x194/0x257 [ 33.551340] ? arch_local_irq_restore+0x53/0x53 [ 33.556032] lockdep_rcu_suspicious+0x123/0x170 [ 33.560708] kvm_dev_ioctl+0x877/0x1840 [ 33.564716] ? install_new_memslots+0x420/0x420 [ 33.569449] ? avc_has_extended_perms+0x7fa/0x12c0 [ 33.574393] ? lock_downgrade+0x990/0x990 [ 33.578570] ? avc_ss_reset+0x110/0x110 [ 33.582556] ? lock_release+0xd70/0xd70 [ 33.586538] ? __lock_is_held+0xbc/0x140 [ 33.590660] ? check_same_owner+0x320/0x320 [ 33.594980] ? rcu_pm_notify+0xc0/0xc0 [ 33.598894] ? install_new_memslots+0x420/0x420 [ 33.603563] do_vfs_ioctl+0x1b1/0x1530 [ 33.607467] ? ioctl_preallocate+0x2b0/0x2b0 [ 33.611899] ? selinux_capable+0x40/0x40 [ 33.615965] ? __lock_acquire+0xae1/0x4620 [ 33.620211] ? lockdep_sys_exit+0x4b/0xf0 [ 33.624380] ? syscall_return_slowpath+0x2b3/0x500 [ 33.629310] ? finish_task_switch+0x1aa/0x740 [ 33.633829] ? security_file_ioctl+0x7d/0xb0 [ 33.638265] ? security_file_ioctl+0x89/0xb0 [ 33.642684] SyS_ioctl+0x8f/0xc0 [ 33.646061] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 33.650829] RIP: 0033:0x44a0e9 [ 33.654018] RSP: 002b:00007fc7181dbdc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 executing program executing program [ 33.661747] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044a0e9 [ 33.669012] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000005 [ 33.676280] RBP: 0000000000000082 R08: 00007fc7181dc700 R09: 00007fc7181dc700 [ 33.683547] R10: 00007fc7181dc700 R11: 0000000000000202 R12: 0000000000000000 [ 33.690812] R13: 00007ffd0d3002ff R14: 00007fc7181dc9c0 R15: 0000000000000000 [ 33.698424] executing program executing program executing program executing program executing program executing program [ 33.712638] ============================= [ 33.721464] WARNING: suspicious RCU usage [ 33.730854] 4.13.0+ #70 Not tainted [ 33.743745] ----------------------------- executing program executing program [ 33.776508] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! executing program executing program executing program [ 33.826908] [ 33.826908] other info that might help us debug this: [ 33.826908] [ 33.849694] [ 33.849694] rcu_scheduler_active = 2, debug_locks = 1 [ 33.862642] no locks held by syzkaller577694/5018. executing program executing program [ 33.896633] [ 33.896633] stack backtrace: [ 33.921496] CPU: 0 PID: 5018 Comm: syzkaller577694 Not tainted 4.13.0+ #70 [ 33.928529] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.937880] Call Trace: [ 33.940476] dump_stack+0x194/0x257 [ 33.944137] ? arch_local_irq_restore+0x53/0x53 [ 33.948860] lockdep_rcu_suspicious+0x123/0x170 [ 33.953540] kvm_dev_ioctl+0xd21/0x1840 [ 33.957550] ? install_new_memslots+0x420/0x420 [ 33.962255] ? avc_has_extended_perms+0x7fa/0x12c0 [ 33.967209] ? lock_downgrade+0x990/0x990 [ 33.971410] ? avc_ss_reset+0x110/0x110 [ 33.975429] ? lock_release+0xd70/0xd70 [ 33.979432] ? __lock_is_held+0xbc/0x140 [ 33.983552] ? check_same_owner+0x320/0x320 [ 33.987877] ? rcu_pm_notify+0xc0/0xc0 [ 33.991800] ? install_new_memslots+0x420/0x420 [ 33.996471] do_vfs_ioctl+0x1b1/0x1530 [ 34.000374] ? ioctl_preallocate+0x2b0/0x2b0 [ 34.004792] ? selinux_capable+0x40/0x40 [ 34.008856] ? __lock_acquire+0xae1/0x4620 [ 34.013100] ? lockdep_sys_exit+0x4b/0xf0 [ 34.017267] ? syscall_return_slowpath+0x2b3/0x500 [ 34.022198] ? finish_task_switch+0x1aa/0x740 [ 34.026722] ? security_file_ioctl+0x7d/0xb0 [ 34.031158] ? security_file_ioctl+0x89/0xb0 [ 34.035597] SyS_ioctl+0x8f/0xc0 [ 34.039006] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 34.043762] RIP: 0033:0x44a0e9 [ 34.046946] RSP: 002b:00007fc7181dbdc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 34.054659] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044a0e9 [ 34.061926] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000005 executing program executing program executing program executing program executing program [ 34.069191] RBP: 0000000000000082 R08: 00007fc7181dc700 R09: 00007fc7181dc700 [ 34.076459] R10: 00007fc7181dc700 R11: 0000000000000202 R12: 0000000000000000 [ 34.083726] R13: 00007ffd0d3002ff R14: 00007fc7181dc9c0 R15: 0000000000000000 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program