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-4,10.128.0.13' (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 syzkaller login: [ 40.693158] [ 40.695160] ============================= [ 40.709531] WARNING: suspicious RCU usage [ 40.715830] 4.13.0+ #75 Not tainted [ 40.719663] ----------------------------- [ 40.727142] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! executing program executing program executing program executing program executing program [ 40.739900] [ 40.739907] ============================= executing program executing program executing program [ 40.739913] WARNING: suspicious RCU usage [ 40.739921] 4.13.0+ #75 Not tainted [ 40.739926] ----------------------------- [ 40.739935] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 40.739940] executing program executing program [ 40.739940] other info that might help us debug this: [ 40.739940] [ 40.739947] [ 40.739947] rcu_scheduler_active = 2, debug_locks = 1 [ 40.739953] no locks held by syzkaller922018/3099. [ 40.739958] [ 40.739958] stack backtrace: [ 40.739967] CPU: 1 PID: 3099 Comm: syzkaller922018 Not tainted 4.13.0+ #75 executing program executing program executing program executing program executing program [ 40.739974] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.739980] Call Trace: [ 40.739996] dump_stack+0x194/0x257 [ 40.740017] ? arch_local_irq_restore+0x53/0x53 [ 40.740053] lockdep_rcu_suspicious+0x123/0x170 [ 40.740070] kvm_dev_ioctl+0xd21/0x1840 executing program executing program executing program executing program [ 40.740098] ? install_new_memslots+0x420/0x420 [ 40.740139] ? avc_has_extended_perms+0x7fa/0x12c0 [ 40.740149] ? lock_downgrade+0x990/0x990 [ 40.740179] ? avc_ss_reset+0x110/0x110 executing program executing program executing program executing program executing program [ 40.740199] ? lock_release+0xd70/0xd70 [ 40.740218] ? __lock_is_held+0xbc/0x140 [ 40.740279] ? check_same_owner+0x320/0x320 [ 40.740289] ? rcu_pm_notify+0xc0/0xc0 [ 40.740323] ? install_new_memslots+0x420/0x420 executing program executing program [ 40.740335] do_vfs_ioctl+0x1b1/0x1530 [ 40.740359] ? ioctl_preallocate+0x2b0/0x2b0 [ 40.740378] ? selinux_capable+0x40/0x40 [ 40.740392] ? trace_hardirqs_on_caller+0x2c1/0x5c0 [ 40.740410] ? lockdep_invariant_state+0xbb/0x120 [ 40.740424] ? syscall_return_slowpath+0x2b3/0x500 [ 40.740433] ? finish_task_switch+0x1aa/0x740 [ 40.740458] ? security_file_ioctl+0x7d/0xb0 executing program executing program executing program executing program [ 40.740467] ? security_file_ioctl+0x89/0xb0 [ 40.740486] SyS_ioctl+0x8f/0xc0 [ 40.740507] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 40.740516] RIP: 0033:0x446209 executing program executing program executing program executing program executing program [ 40.740523] RSP: 002b:00007f5ddbd47dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 40.740536] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 40.740543] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000005 executing program executing program executing program executing program [ 40.740550] RBP: 0000000000000082 R08: 00007f5ddbd48700 R09: 00007f5ddbd48700 [ 40.740557] R10: 00007f5ddbd48700 R11: 0000000000000246 R12: 0000000000000000 [ 40.740564] R13: 00007fff2040de1f R14: 00007f5ddbd489c0 R15: 0000000000000000 executing program executing program executing program [ 41.267423] [ 41.267423] other info that might help us debug this: [ 41.267423] [ 41.304372] [ 41.304372] rcu_scheduler_active = 2, debug_locks = 1 executing program [ 41.315252] no locks held by syzkaller922018/3081. [ 41.320951] [ 41.320951] stack backtrace: [ 41.326957] CPU: 1 PID: 3081 Comm: syzkaller922018 Not tainted 4.13.0+ #75 [ 41.333990] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.343332] Call Trace: [ 41.346040] dump_stack+0x194/0x257 [ 41.349703] ? arch_local_irq_restore+0x53/0x53 [ 41.354387] lockdep_rcu_suspicious+0x123/0x170 [ 41.359043] kvm_dev_ioctl+0x877/0x1840 [ 41.363022] ? install_new_memslots+0x420/0x420 [ 41.367692] ? avc_has_extended_perms+0x7fa/0x12c0 [ 41.372708] ? lock_downgrade+0x990/0x990 [ 41.376868] ? avc_ss_reset+0x110/0x110 [ 41.380842] ? lock_release+0xd70/0xd70 [ 41.384824] ? __lock_is_held+0xbc/0x140 [ 41.388919] ? check_same_owner+0x320/0x320 [ 41.393247] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 41.398441] ? install_new_memslots+0x420/0x420 [ 41.403095] do_vfs_ioctl+0x1b1/0x1530 [ 41.406968] ? ioctl_preallocate+0x2b0/0x2b0 [ 41.411362] ? selinux_capable+0x40/0x40 [ 41.415411] ? lockdep_invariant_state+0xbb/0x120 [ 41.420483] ? syscall_return_slowpath+0x2b3/0x500 [ 41.425404] ? finish_task_switch+0x4c9/0x740 [ 41.429886] ? security_file_ioctl+0x7d/0xb0 [ 41.434269] ? security_file_ioctl+0x89/0xb0 [ 41.438658] SyS_ioctl+0x8f/0xc0 [ 41.442006] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 41.446738] RIP: 0033:0x446209 [ 41.449902] RSP: 002b:00007f5ddbd47dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 41.457589] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 executing program executing program executing program executing program executing program executing program executing program executing program [ 41.464837] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 41.472082] RBP: 0000000000000082 R08: 00007f5ddbd48700 R09: 00007f5ddbd48700 [ 41.479329] R10: 00007f5ddbd48700 R11: 0000000000000246 R12: 0000000000000000 [ 41.486577] R13: 00007fff2040de1f R14: 00007f5ddbd489c0 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