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-9,10.128.0.43' (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 syzkaller login: [ 47.696551] [ 47.696716] [ 47.696721] ============================= [ 47.696725] WARNING: suspicious RCU usage [ 47.696731] 4.13.0-mm1+ #7 Not tainted [ 47.696735] ----------------------------- [ 47.696741] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 47.696745] [ 47.696745] other info that might help us debug this: [ 47.696745] [ 47.696751] [ 47.696751] rcu_scheduler_active = 2, debug_locks = 1 [ 47.696756] no locks held by syzkaller673966/5081. [ 47.696760] [ 47.696760] stack backtrace: [ 47.696768] CPU: 0 PID: 5081 Comm: syzkaller673966 Not tainted 4.13.0-mm1+ #7 executing program executing program executing program executing program [ 47.696774] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.696779] Call Trace: [ 47.696794] dump_stack+0x194/0x257 executing program executing program [ 47.696809] ? arch_local_irq_restore+0x53/0x53 [ 47.696840] lockdep_rcu_suspicious+0x123/0x170 [ 47.696860] kvm_dev_ioctl+0xd21/0x1840 [ 47.696885] ? install_new_memslots+0x420/0x420 [ 47.696923] ? avc_has_extended_perms+0x7fa/0x12c0 executing program executing program executing program [ 47.696929] ? lock_downgrade+0x990/0x990 [ 47.696954] ? avc_ss_reset+0x110/0x110 [ 47.696972] ? lock_release+0xd70/0xd70 [ 47.696989] ? __lock_is_held+0xbc/0x140 executing program executing program executing program executing program executing program executing program executing program [ 47.697046] ? check_same_owner+0x320/0x320 [ 47.697056] ? rcu_pm_notify+0xc0/0xc0 [ 47.697087] ? install_new_memslots+0x420/0x420 [ 47.697099] do_vfs_ioctl+0x1b1/0x1530 executing program executing program executing program [ 47.697121] ? ioctl_preallocate+0x2b0/0x2b0 [ 47.697137] ? selinux_capable+0x40/0x40 [ 47.697149] ? __lock_acquire+0x1651/0x4620 executing program executing program executing program executing program executing program [ 47.697166] ? lockdep_invariant_state+0xdb/0x120 [ 47.697180] ? syscall_return_slowpath+0x2b3/0x500 [ 47.697188] ? finish_task_switch+0x1aa/0x740 [ 47.697211] ? security_file_ioctl+0x7d/0xb0 [ 47.697219] ? security_file_ioctl+0x89/0xb0 executing program executing program [ 47.697237] SyS_ioctl+0x8f/0xc0 executing program [ 47.697258] entry_SYSCALL_64_fastpath+0x1f/0xbe executing program executing program executing program [ 47.697266] RIP: 0033:0x446209 [ 47.697271] RSP: 002b:00007f1862b35dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 47.697283] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 executing program executing program executing program [ 47.697289] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 executing program executing program [ 47.697296] RBP: 0000000000000082 R08: 00007f1862b36700 R09: 00007f1862b36700 [ 47.697301] R10: 00007f1862b36700 R11: 0000000000000246 R12: 0000000000000000 [ 47.697308] R13: 00007ffd13c39fef R14: 00007f1862b369c0 R15: 0000000000000000 [ 48.231226] ============================= executing program executing program executing program executing program executing program [ 48.236357] WARNING: suspicious RCU usage [ 48.240839] 4.13.0-mm1+ #7 Not tainted [ 48.245818] ----------------------------- [ 48.260529] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 48.269256] [ 48.269256] other info that might help us debug this: [ 48.269256] executing program executing program executing program [ 48.291124] [ 48.291124] rcu_scheduler_active = 2, debug_locks = 1 [ 48.302299] no locks held by syzkaller673966/5075. [ 48.307599] [ 48.307599] stack backtrace: [ 48.327862] CPU: 1 PID: 5075 Comm: syzkaller673966 Not tainted 4.13.0-mm1+ #7 [ 48.335162] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.344508] Call Trace: [ 48.347096] dump_stack+0x194/0x257 [ 48.350727] ? arch_local_irq_restore+0x53/0x53 [ 48.355410] lockdep_rcu_suspicious+0x123/0x170 [ 48.360083] kvm_dev_ioctl+0x877/0x1840 [ 48.364068] ? install_new_memslots+0x420/0x420 [ 48.368760] ? avc_has_extended_perms+0x7fa/0x12c0 [ 48.373683] ? lock_downgrade+0x990/0x990 [ 48.377846] ? avc_ss_reset+0x110/0x110 [ 48.381848] ? lock_release+0xd70/0xd70 [ 48.385826] ? __lock_is_held+0xbc/0x140 [ 48.389925] ? check_same_owner+0x320/0x320 [ 48.394250] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 48.399367] ? install_new_memslots+0x420/0x420 [ 48.404029] do_vfs_ioctl+0x1b1/0x1530 [ 48.407921] ? ioctl_preallocate+0x2b0/0x2b0 [ 48.412331] ? selinux_capable+0x40/0x40 [ 48.416406] ? lockdep_invariant_state+0xdb/0x120 [ 48.421243] ? syscall_return_slowpath+0x2b3/0x500 [ 48.426168] ? finish_task_switch+0x4c9/0x740 [ 48.430669] ? security_file_ioctl+0x7d/0xb0 [ 48.435071] ? security_file_ioctl+0x89/0xb0 [ 48.439482] SyS_ioctl+0x8f/0xc0 [ 48.442854] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 48.447602] RIP: 0033:0x446209 [ 48.450784] RSP: 002b:00007f1864338dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 48.458496] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 48.465756] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 48.473018] RBP: 0000000000000082 R08: 00007f1864339700 R09: 00007f1864339700 [ 48.480278] R10: 00007f1864339700 R11: 0000000000000246 R12: 0000000000000000 executing program executing program executing program executing program executing program executing program [ 48.487539] R13: 00007ffd13c39fef R14: 00007f18643399c0 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