INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-upstream-kasan-gce-8,10.128.15.208' (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 syzkaller login: [ 57.221691] [ 57.222168] ============================= [ 57.222865] WARNING: suspicious RCU usage [ 57.228437] 4.13.0+ #66 Not tainted [ 57.230752] ----------------------------- [ 57.232884] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 57.235053] [ 57.235053] other info that might help us debug this: [ 57.235053] [ 57.241598] [ 57.241598] rcu_scheduler_active = 2, debug_locks = 1 [ 57.259660] no locks held by syzkaller308111/7196. [ 57.267717] executing program executing program [ 57.267717] stack backtrace: [ 57.285130] CPU: 1 PID: 7196 Comm: syzkaller308111 Not tainted 4.13.0+ #66 [ 57.292146] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.301475] Call Trace: [ 57.304042] dump_stack+0x194/0x257 [ 57.307659] ? arch_local_irq_restore+0x53/0x53 [ 57.312326] lockdep_rcu_suspicious+0x123/0x170 [ 57.316986] kvm_dev_ioctl+0x877/0x1840 executing program [ 57.320944] ? lock_downgrade+0x990/0x990 [ 57.325093] ? install_new_memslots+0x420/0x420 [ 57.329773] ? avc_has_extended_perms+0x7fa/0x12c0 [ 57.334685] ? find_held_lock+0x35/0x1d0 [ 57.338749] ? avc_ss_reset+0x110/0x110 [ 57.342706] ? lock_downgrade+0x990/0x990 [ 57.346842] ? lock_release+0xa40/0xa40 [ 57.350808] ? __lock_is_held+0xb6/0x140 [ 57.354898] ? check_same_owner+0x320/0x320 [ 57.359223] ? install_new_memslots+0x420/0x420 [ 57.363878] do_vfs_ioctl+0x1b1/0x1520 [ 57.367760] ? ioctl_preallocate+0x2b0/0x2b0 [ 57.372158] ? selinux_capable+0x40/0x40 [ 57.376206] ? lock_release+0x91/0xa40 [ 57.380091] ? syscall_return_slowpath+0x22f/0x450 [ 57.385018] ? security_file_ioctl+0x7d/0xb0 [ 57.389408] ? security_file_ioctl+0x89/0xb0 [ 57.393804] SyS_ioctl+0x8f/0xc0 [ 57.397157] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 57.401881] RIP: 0033:0x449149 [ 57.405048] RSP: 002b:00007fe34f415dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 57.412733] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000449149 executing program executing program executing program executing program executing program executing program [ 57.419983] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 [ 57.427235] RBP: 0000000000000086 R08: 00007fe34f416700 R09: 00007fe34f416700 [ 57.434483] R10: 00007fe34f416700 R11: 0000000000000202 R12: 0000000000000000 [ 57.441729] R13: 00007ffe24a4d12f R14: 00007fe34f4169c0 R15: 0000000000000000 [ 57.449159] [ 57.456065] ============================= [ 57.462242] WARNING: suspicious RCU usage executing program executing program [ 57.469882] 4.13.0+ #66 Not tainted [ 57.476540] ----------------------------- [ 57.482207] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 57.495806] [ 57.495806] other info that might help us debug this: [ 57.495806] [ 57.504250] [ 57.504250] rcu_scheduler_active = 2, debug_locks = 1 [ 57.513901] no locks held by syzkaller308111/7196. [ 57.518944] [ 57.518944] stack backtrace: [ 57.527411] CPU: 0 PID: 7196 Comm: syzkaller308111 Not tainted 4.13.0+ #66 [ 57.534420] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.543749] Call Trace: [ 57.546318] dump_stack+0x194/0x257 [ 57.549935] ? arch_local_irq_restore+0x53/0x53 [ 57.554606] lockdep_rcu_suspicious+0x123/0x170 [ 57.559256] kvm_dev_ioctl+0xd21/0x1840 [ 57.563204] ? lock_downgrade+0x990/0x990 [ 57.567348] ? install_new_memslots+0x420/0x420 executing program executing program executing program [ 57.572025] ? avc_has_extended_perms+0x7fa/0x12c0 [ 57.576941] ? find_held_lock+0x35/0x1d0 [ 57.581012] ? avc_ss_reset+0x110/0x110 [ 57.584968] ? lock_downgrade+0x990/0x990 [ 57.589106] ? lock_release+0xa40/0xa40 [ 57.593071] ? __lock_is_held+0xb6/0x140 [ 57.597161] ? check_same_owner+0x320/0x320 [ 57.601493] ? install_new_memslots+0x420/0x420 [ 57.606146] do_vfs_ioctl+0x1b1/0x1520 [ 57.610017] ? ioctl_preallocate+0x2b0/0x2b0 [ 57.614412] ? selinux_capable+0x40/0x40 [ 57.618451] ? lock_release+0x91/0xa40 executing program [ 57.622327] ? syscall_return_slowpath+0x22f/0x450 [ 57.627252] ? security_file_ioctl+0x7d/0xb0 [ 57.631641] ? security_file_ioctl+0x89/0xb0 [ 57.636039] SyS_ioctl+0x8f/0xc0 [ 57.639398] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 57.644135] RIP: 0033:0x449149 [ 57.647309] RSP: 002b:00007fe34f415dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 57.655002] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000449149 [ 57.662256] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 executing program executing program executing program executing program executing program executing program executing program [ 57.669510] RBP: 0000000000000086 R08: 00007fe34f416700 R09: 00007fe34f416700 [ 57.676760] R10: 00007fe34f416700 R11: 0000000000000202 R12: 0000000000000000 [ 57.684011] R13: 00007ffe24a4d12f R14: 00007fe34f4169c0 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 executing program executing program