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-6,10.128.15.201' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 32.448940] kvm: KVM_SET_TSS_ADDR need to be called before entering vcpu executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 38.712320] [ 38.731105] ============================= [ 38.750346] WARNING: suspicious RCU usage executing program executing program executing program [ 38.767227] 4.13.0-rc7+ #64 Not tainted [ 38.783824] ----------------------------- [ 38.805737] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! executing program [ 38.826082] [ 38.826082] other info that might help us debug this: [ 38.826082] [ 38.850346] [ 38.850346] rcu_scheduler_active = 2, debug_locks = 1 executing program executing program executing program [ 38.874920] no locks held by syzkaller569868/9854. [ 38.883091] [ 38.883091] stack backtrace: [ 38.894546] CPU: 1 PID: 9854 Comm: syzkaller569868 Not tainted 4.13.0-rc7+ #64 [ 38.901905] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.911243] Call Trace: [ 38.913814] dump_stack+0x194/0x257 [ 38.917440] ? arch_local_irq_restore+0x53/0x53 [ 38.922108] lockdep_rcu_suspicious+0x123/0x170 [ 38.926762] kvm_dev_ioctl+0x877/0x1840 [ 38.930716] ? lock_downgrade+0x990/0x990 [ 38.934858] ? install_new_memslots+0x420/0x420 [ 38.939538] ? avc_has_extended_perms+0x7fa/0x12c0 [ 38.944476] ? find_held_lock+0x35/0x1d0 [ 38.948534] ? avc_ss_reset+0x110/0x110 [ 38.952485] ? lock_downgrade+0x990/0x990 [ 38.956619] ? lock_release+0xa40/0xa40 [ 38.960579] ? __lock_is_held+0xb6/0x140 [ 38.964663] ? check_same_owner+0x320/0x320 [ 38.968984] ? install_new_memslots+0x420/0x420 [ 38.973637] do_vfs_ioctl+0x1b1/0x1520 [ 38.977528] ? ioctl_preallocate+0x2b0/0x2b0 [ 38.981936] ? selinux_capable+0x40/0x40 [ 38.985976] ? lock_release+0x91/0xa40 [ 38.989855] ? syscall_return_slowpath+0x22f/0x450 [ 38.994775] ? security_file_ioctl+0x7d/0xb0 [ 38.999163] ? security_file_ioctl+0x89/0xb0 [ 39.003558] SyS_ioctl+0x8f/0xc0 [ 39.006911] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 39.011643] RIP: 0033:0x446819 [ 39.014808] RSP: 002b:00007f4cd7509dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 executing program executing program [ 39.022529] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446819 [ 39.029776] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 39.037024] RBP: 0000000000000086 R08: 00007f4cd750a700 R09: 00007f4cd750a700 [ 39.044271] R10: 00007f4cd750a700 R11: 0000000000000202 R12: 0000000000000000 [ 39.051520] R13: 00007ffcbcd42e3f R14: 00007f4cd750a9c0 R15: 0000000000000000 [ 39.059044] [ 39.070249] ============================= executing program [ 39.080358] WARNING: suspicious RCU usage [ 39.093639] 4.13.0-rc7+ #64 Not tainted [ 39.100995] ----------------------------- [ 39.114393] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 39.142383] [ 39.142383] other info that might help us debug this: [ 39.142383] [ 39.155667] [ 39.155667] rcu_scheduler_active = 2, debug_locks = 1 [ 39.166158] no locks held by syzkaller569868/9854. [ 39.172485] [ 39.172485] stack backtrace: [ 39.177777] CPU: 1 PID: 9854 Comm: syzkaller569868 Not tainted 4.13.0-rc7+ #64 [ 39.185126] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.194455] Call Trace: [ 39.197025] dump_stack+0x194/0x257 [ 39.200642] ? arch_local_irq_restore+0x53/0x53 [ 39.205308] lockdep_rcu_suspicious+0x123/0x170 [ 39.209963] kvm_dev_ioctl+0xd21/0x1840 [ 39.213913] ? lock_downgrade+0x990/0x990 [ 39.218052] ? install_new_memslots+0x420/0x420 [ 39.222727] ? avc_has_extended_perms+0x7fa/0x12c0 [ 39.227633] ? find_held_lock+0x35/0x1d0 [ 39.231702] ? avc_ss_reset+0x110/0x110 [ 39.235653] ? lock_downgrade+0x990/0x990 [ 39.239784] ? lock_release+0xa40/0xa40 [ 39.243740] ? __lock_is_held+0xb6/0x140 [ 39.247822] ? check_same_owner+0x320/0x320 [ 39.252142] ? install_new_memslots+0x420/0x420 [ 39.256788] do_vfs_ioctl+0x1b1/0x1520 [ 39.260666] ? ioctl_preallocate+0x2b0/0x2b0 [ 39.265058] ? selinux_capable+0x40/0x40 [ 39.269097] ? lock_release+0x91/0xa40 [ 39.272978] ? syscall_return_slowpath+0x22f/0x450 [ 39.277900] ? security_file_ioctl+0x7d/0xb0 [ 39.282283] ? security_file_ioctl+0x89/0xb0 [ 39.286679] SyS_ioctl+0x8f/0xc0 executing program executing program executing program executing program executing program [ 39.290032] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 39.294767] RIP: 0033:0x446819 [ 39.297935] RSP: 002b:00007f4cd7509dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 39.305619] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446819 [ 39.312867] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 39.320115] RBP: 0000000000000086 R08: 00007f4cd750a700 R09: 00007f4cd750a700 [ 39.327362] R10: 00007f4cd750a700 R11: 0000000000000202 R12: 0000000000000000 [ 39.334610] R13: 00007ffcbcd42e3f R14: 00007f4cd750a9c0 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