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-4,10.128.0.54' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 137.874438] [ 137.882803] ============================= [ 137.889254] WARNING: suspicious RCU usage [ 137.909254] 4.13.0-rc6+ #46 Not tainted [ 137.917252] ----------------------------- executing program [ 137.921959] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 137.936578] [ 137.936578] other info that might help us debug this: [ 137.936578] [ 137.945596] [ 137.945596] rcu_scheduler_active = 2, debug_locks = 1 [ 137.953111] no locks held by syzkaller465171/27139. [ 137.958682] [ 137.958682] stack backtrace: executing program [ 137.967933] CPU: 1 PID: 27139 Comm: syzkaller465171 Not tainted 4.13.0-rc6+ #46 [ 137.975384] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 137.984723] Call Trace: [ 137.987299] dump_stack+0x194/0x257 [ 137.990921] ? arch_local_irq_restore+0x53/0x53 [ 137.995611] lockdep_rcu_suspicious+0x123/0x170 [ 138.000272] kvm_dev_ioctl+0x877/0x1840 [ 138.004231] ? lock_downgrade+0x990/0x990 [ 138.008379] ? install_new_memslots+0x420/0x420 [ 138.013063] ? avc_has_extended_perms+0x7fa/0x12c0 [ 138.017978] ? find_held_lock+0x35/0x1d0 executing program [ 138.022045] ? avc_ss_reset+0x110/0x110 [ 138.026020] ? lock_downgrade+0x990/0x990 [ 138.030163] ? lock_release+0xa40/0xa40 [ 138.034131] ? __lock_is_held+0xb6/0x140 [ 138.038225] ? check_same_owner+0x320/0x320 [ 138.042539] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 138.047649] ? install_new_memslots+0x420/0x420 [ 138.052307] do_vfs_ioctl+0x1b1/0x1520 [ 138.056195] ? ioctl_preallocate+0x2b0/0x2b0 [ 138.060627] ? selinux_capable+0x40/0x40 [ 138.064707] ? syscall_return_slowpath+0x22f/0x450 [ 138.069650] ? security_file_ioctl+0x7d/0xb0 executing program executing program [ 138.074043] ? security_file_ioctl+0x89/0xb0 [ 138.078472] SyS_ioctl+0x8f/0xc0 [ 138.081830] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 138.086570] RIP: 0033:0x44ac49 [ 138.089743] RSP: 002b:00007fa655fcbdc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 138.097436] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044ac49 [ 138.104710] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 [ 138.111962] RBP: 0000000000000086 R08: 00007fa655fcc700 R09: 00007fa655fcc700 executing program [ 138.119218] R10: 00007fa655fcc700 R11: 0000000000000202 R12: 0000000000000000 [ 138.126472] R13: 00007fff0c1b995f R14: 00007fa655fcc9c0 R15: 0000000000000000 [ 138.133955] [ 138.138089] ============================= [ 138.142901] WARNING: suspicious RCU usage [ 138.147223] 4.13.0-rc6+ #46 Not tainted [ 138.153968] ----------------------------- [ 138.159755] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 138.171779] executing program [ 138.171779] other info that might help us debug this: [ 138.171779] [ 138.183200] [ 138.183200] rcu_scheduler_active = 2, debug_locks = 1 [ 138.190639] no locks held by syzkaller465171/27139. [ 138.199519] [ 138.199519] stack backtrace: [ 138.205229] CPU: 1 PID: 27139 Comm: syzkaller465171 Not tainted 4.13.0-rc6+ #46 [ 138.212667] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 138.222003] Call Trace: executing program executing program [ 138.224610] dump_stack+0x194/0x257 [ 138.228232] ? arch_local_irq_restore+0x53/0x53 [ 138.232911] lockdep_rcu_suspicious+0x123/0x170 [ 138.237606] kvm_dev_ioctl+0xd21/0x1840 [ 138.241568] ? lock_downgrade+0x990/0x990 [ 138.245736] ? install_new_memslots+0x420/0x420 [ 138.250478] ? avc_has_extended_perms+0x7fa/0x12c0 [ 138.255439] ? find_held_lock+0x35/0x1d0 [ 138.259525] ? avc_ss_reset+0x110/0x110 [ 138.263485] ? lock_downgrade+0x990/0x990 [ 138.267625] ? lock_release+0xa40/0xa40 [ 138.271594] ? __lock_is_held+0xb6/0x140 executing program [ 138.275688] ? check_same_owner+0x320/0x320 [ 138.280001] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 138.285130] ? install_new_memslots+0x420/0x420 [ 138.289821] do_vfs_ioctl+0x1b1/0x1520 [ 138.293708] ? ioctl_preallocate+0x2b0/0x2b0 [ 138.298111] ? selinux_capable+0x40/0x40 [ 138.302177] ? syscall_return_slowpath+0x22f/0x450 [ 138.307122] ? security_file_ioctl+0x7d/0xb0 [ 138.311515] ? security_file_ioctl+0x89/0xb0 [ 138.315918] SyS_ioctl+0x8f/0xc0 [ 138.319294] entry_SYSCALL_64_fastpath+0x1f/0xbe executing program executing program executing program executing program executing program [ 138.324032] RIP: 0033:0x44ac49 [ 138.327207] RSP: 002b:00007fa655fcbdc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 138.334899] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044ac49 [ 138.342148] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 [ 138.349393] RBP: 0000000000000086 R08: 00007fa655fcc700 R09: 00007fa655fcc700 [ 138.356647] R10: 00007fa655fcc700 R11: 0000000000000202 R12: 0000000000000000 [ 138.363903] R13: 00007fff0c1b995f R14: 00007fa655fcc9c0 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