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-3,10.128.0.17' (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 syzkaller login: [ 50.767089] [ 50.774566] ============================= [ 50.788524] WARNING: suspicious RCU usage [ 50.803124] 4.13.0-mm1+ #7 Not tainted [ 50.807954] ----------------------------- executing program executing program executing program executing program [ 50.812596] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 50.825991] [ 50.825991] other info that might help us debug this: [ 50.825991] [ 50.834630] [ 50.834630] rcu_scheduler_active = 2, debug_locks = 1 [ 50.856802] no locks held by syzkaller457182/4700. [ 50.865133] executing program [ 50.865133] stack backtrace: [ 50.871296] CPU: 0 PID: 4700 Comm: syzkaller457182 Not tainted 4.13.0-mm1+ #7 [ 50.878566] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.887909] Call Trace: [ 50.890493] dump_stack+0x194/0x257 [ 50.894124] ? arch_local_irq_restore+0x53/0x53 [ 50.898809] lockdep_rcu_suspicious+0x123/0x170 [ 50.903479] kvm_dev_ioctl+0x877/0x1840 [ 50.907461] ? install_new_memslots+0x420/0x420 [ 50.912151] ? avc_has_extended_perms+0x7fa/0x12c0 [ 50.917077] ? lock_downgrade+0x990/0x990 [ 50.921237] ? avc_ss_reset+0x110/0x110 [ 50.925216] ? lock_release+0xd70/0xd70 [ 50.929189] ? __lock_is_held+0xbc/0x140 [ 50.933290] ? check_same_owner+0x320/0x320 [ 50.937615] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 50.942730] ? install_new_memslots+0x420/0x420 [ 50.947395] do_vfs_ioctl+0x1b1/0x1530 [ 50.951287] ? ioctl_preallocate+0x2b0/0x2b0 [ 50.955692] ? selinux_capable+0x40/0x40 [ 50.959759] ? lockdep_invariant_state+0xdb/0x120 [ 50.964595] ? syscall_return_slowpath+0x2b3/0x500 [ 50.969518] ? finish_task_switch+0x4c9/0x740 [ 50.974017] ? security_file_ioctl+0x7d/0xb0 [ 50.978418] ? security_file_ioctl+0x89/0xb0 [ 50.982833] SyS_ioctl+0x8f/0xc0 [ 50.986217] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 50.990960] RIP: 0033:0x446209 [ 50.994137] RSP: 002b:00007f8d3d434dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 51.001839] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 51.009097] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 executing program executing program executing program executing program executing program [ 51.016356] RBP: 0000000000000082 R08: 00007f8d3d435700 R09: 00007f8d3d435700 [ 51.023615] R10: 00007f8d3d435700 R11: 0000000000000246 R12: 0000000000000000 [ 51.030876] R13: 00007ffcd6a311bf R14: 00007f8d3d4359c0 R15: 0000000000000000 [ 51.038338] [ 51.040451] ============================= [ 51.051473] WARNING: suspicious RCU usage [ 51.061519] 4.13.0-mm1+ #7 Not tainted executing program executing program executing program [ 51.066593] ----------------------------- [ 51.077751] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 51.094359] [ 51.094359] other info that might help us debug this: [ 51.094359] [ 51.104354] [ 51.104354] rcu_scheduler_active = 2, debug_locks = 1 executing program executing program [ 51.118652] no locks held by syzkaller457182/4700. [ 51.130782] [ 51.130782] stack backtrace: [ 51.140604] CPU: 0 PID: 4700 Comm: syzkaller457182 Not tainted 4.13.0-mm1+ #7 [ 51.147890] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.157234] Call Trace: [ 51.159820] dump_stack+0x194/0x257 [ 51.163444] ? arch_local_irq_restore+0x53/0x53 executing program [ 51.168128] lockdep_rcu_suspicious+0x123/0x170 [ 51.172799] kvm_dev_ioctl+0xd21/0x1840 [ 51.176784] ? install_new_memslots+0x420/0x420 [ 51.181475] ? avc_has_extended_perms+0x7fa/0x12c0 [ 51.186396] ? lock_downgrade+0x990/0x990 [ 51.190554] ? avc_ss_reset+0x110/0x110 [ 51.194530] ? lock_release+0xd70/0xd70 [ 51.198504] ? __lock_is_held+0xbc/0x140 [ 51.202603] ? check_same_owner+0x320/0x320 [ 51.206926] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 51.212038] ? install_new_memslots+0x420/0x420 [ 51.216714] do_vfs_ioctl+0x1b1/0x1530 [ 51.220604] ? ioctl_preallocate+0x2b0/0x2b0 [ 51.225011] ? selinux_capable+0x40/0x40 [ 51.229081] ? lockdep_invariant_state+0xdb/0x120 [ 51.233917] ? syscall_return_slowpath+0x2b3/0x500 [ 51.238840] ? finish_task_switch+0x4c9/0x740 [ 51.243339] ? security_file_ioctl+0x7d/0xb0 [ 51.247740] ? security_file_ioctl+0x89/0xb0 [ 51.252151] SyS_ioctl+0x8f/0xc0 [ 51.255521] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 51.260265] RIP: 0033:0x446209 executing program executing program executing program executing program executing program [ 51.263442] RSP: 002b:00007f8d3d434dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 51.271147] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 51.278407] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 51.285666] RBP: 0000000000000082 R08: 00007f8d3d435700 R09: 00007f8d3d435700 [ 51.292925] R10: 00007f8d3d435700 R11: 0000000000000246 R12: 0000000000000000 [ 51.300185] R13: 00007ffcd6a311bf R14: 00007f8d3d4359c0 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 executing program executing program executing program executing program executing program executing program