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-mmots-kasan-gce-2,10.128.0.58' (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 syzkaller login: [ 42.204955] [ 42.206803] ============================= [ 42.222512] WARNING: suspicious RCU usage [ 42.242470] 4.13.0-mm1+ #7 Not tainted executing program executing program executing program executing program executing program executing program [ 42.276936] ----------------------------- [ 42.292749] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 42.302207] [ 42.302207] other info that might help us debug this: [ 42.302207] [ 42.315452] [ 42.315452] rcu_scheduler_active = 2, debug_locks = 1 executing program executing program [ 42.331880] no locks held by syzkaller408506/5315. executing program [ 42.365831] [ 42.365831] stack backtrace: executing program [ 42.391715] CPU: 0 PID: 5315 Comm: syzkaller408506 Not tainted 4.13.0-mm1+ #7 [ 42.398992] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.408337] Call Trace: [ 42.410922] dump_stack+0x194/0x257 [ 42.414550] ? arch_local_irq_restore+0x53/0x53 [ 42.419235] lockdep_rcu_suspicious+0x123/0x170 [ 42.423911] kvm_dev_ioctl+0x877/0x1840 [ 42.427901] ? install_new_memslots+0x420/0x420 [ 42.432600] ? avc_has_extended_perms+0x7fa/0x12c0 [ 42.437522] ? lock_downgrade+0x990/0x990 executing program [ 42.441686] ? avc_ss_reset+0x110/0x110 [ 42.445660] ? lock_release+0xd70/0xd70 [ 42.449637] ? __lock_is_held+0xbc/0x140 [ 42.453749] ? check_same_owner+0x320/0x320 [ 42.458064] ? rcu_pm_notify+0xc0/0xc0 [ 42.461971] ? install_new_memslots+0x420/0x420 [ 42.466637] do_vfs_ioctl+0x1b1/0x1530 [ 42.470528] ? ioctl_preallocate+0x2b0/0x2b0 [ 42.474934] ? selinux_capable+0x40/0x40 [ 42.478992] ? __lock_acquire+0x1651/0x4620 [ 42.483319] ? lockdep_invariant_state+0xdb/0x120 executing program [ 42.488156] ? syscall_return_slowpath+0x2b3/0x500 [ 42.493077] ? finish_task_switch+0x1aa/0x740 [ 42.497583] ? security_file_ioctl+0x7d/0xb0 [ 42.501983] ? security_file_ioctl+0x89/0xb0 [ 42.506393] SyS_ioctl+0x8f/0xc0 [ 42.509764] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 42.514508] RIP: 0033:0x446379 [ 42.517687] RSP: 002b:00007f462ede5dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 42.525393] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446379 [ 42.532654] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 executing program executing program executing program executing program executing program [ 42.539912] RBP: 0000000000000082 R08: 00007f462ede6700 R09: 00007f462ede6700 [ 42.547172] R10: 00007f462ede6700 R11: 0000000000000202 R12: 0000000000000000 [ 42.554432] R13: 00007ffc6c815b6f R14: 00007f462ede69c0 R15: 0000000000000000 [ 42.561910] [ 42.582399] ============================= [ 42.588123] WARNING: suspicious RCU usage executing program [ 42.597469] 4.13.0-mm1+ #7 Not tainted [ 42.608176] ----------------------------- [ 42.631960] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! executing program executing program executing program executing program [ 42.646540] [ 42.646540] other info that might help us debug this: [ 42.646540] [ 42.661781] [ 42.661781] rcu_scheduler_active = 2, debug_locks = 1 executing program executing program [ 42.694178] no locks held by syzkaller408506/5315. [ 42.705098] [ 42.705098] stack backtrace: [ 42.713963] CPU: 0 PID: 5315 Comm: syzkaller408506 Not tainted 4.13.0-mm1+ #7 [ 42.721241] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.730583] Call Trace: [ 42.733169] dump_stack+0x194/0x257 [ 42.736801] ? arch_local_irq_restore+0x53/0x53 executing program [ 42.741489] lockdep_rcu_suspicious+0x123/0x170 [ 42.746158] kvm_dev_ioctl+0xd21/0x1840 [ 42.750145] ? install_new_memslots+0x420/0x420 [ 42.754840] ? avc_has_extended_perms+0x7fa/0x12c0 [ 42.759758] ? lock_downgrade+0x990/0x990 [ 42.763924] ? avc_ss_reset+0x110/0x110 [ 42.767905] ? lock_release+0xd70/0xd70 [ 42.771884] ? __lock_is_held+0xbc/0x140 [ 42.775992] ? check_same_owner+0x320/0x320 [ 42.780313] ? rcu_pm_notify+0xc0/0xc0 [ 42.784221] ? install_new_memslots+0x420/0x420 [ 42.788882] do_vfs_ioctl+0x1b1/0x1530 [ 42.792777] ? ioctl_preallocate+0x2b0/0x2b0 [ 42.797187] ? selinux_capable+0x40/0x40 [ 42.801243] ? __lock_acquire+0x1651/0x4620 [ 42.805564] ? lockdep_invariant_state+0xdb/0x120 [ 42.810403] ? syscall_return_slowpath+0x2b3/0x500 [ 42.815325] ? finish_task_switch+0x1aa/0x740 [ 42.819829] ? security_file_ioctl+0x7d/0xb0 [ 42.824225] ? security_file_ioctl+0x89/0xb0 [ 42.828636] SyS_ioctl+0x8f/0xc0 [ 42.832009] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 42.836751] RIP: 0033:0x446379 executing program executing program [ 42.839930] RSP: 002b:00007f462ede5dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 42.847634] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446379 [ 42.854895] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 [ 42.862157] RBP: 0000000000000082 R08: 00007f462ede6700 R09: 00007f462ede6700 [ 42.869417] R10: 00007f462ede6700 R11: 0000000000000202 R12: 0000000000000000 [ 42.876675] R13: 00007ffc6c815b6f R14: 00007f462ede69c0 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