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-mmots-kasan-gce-9,10.128.0.61' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 43.326520] [ 43.326870] ============================= [ 43.327753] WARNING: suspicious RCU usage [ 43.328383] 4.13.0-mm1+ #7 Not tainted [ 43.328908] ----------------------------- [ 43.329513] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 43.330623] [ 43.330623] other info that might help us debug this: [ 43.330623] [ 43.331725] [ 43.331725] rcu_scheduler_active = 2, debug_locks = 1 [ 43.332671] no locks held by syzkaller217505/3815. [ 43.333351] [ 43.333351] stack backtrace: [ 43.333957] CPU: 0 PID: 3815 Comm: syzkaller217505 Not tainted 4.13.0-mm1+ #7 [ 43.334963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.336203] Call Trace: [ 43.336571] dump_stack+0x194/0x257 [ 43.337068] ? arch_local_irq_restore+0x53/0x53 [ 43.337729] lockdep_rcu_suspicious+0x123/0x170 [ 43.338363] kvm_dev_ioctl+0x877/0x1840 [ 43.338909] ? install_new_memslots+0x420/0x420 [ 43.339552] ? avc_has_extended_perms+0x7fa/0x12c0 [ 43.340210] ? lock_downgrade+0x990/0x990 [ 43.340780] ? avc_ss_reset+0x110/0x110 [ 43.341322] ? lock_release+0xd70/0xd70 [ 43.341864] ? __lock_is_held+0xbc/0x140 [ 43.342452] ? check_same_owner+0x320/0x320 [ 43.343034] ? rcu_pm_notify+0xc0/0xc0 [ 43.343572] ? install_new_memslots+0x420/0x420 [ 43.344199] do_vfs_ioctl+0x1b1/0x1530 [ 43.344732] ? ioctl_preallocate+0x2b0/0x2b0 [ 43.345345] ? selinux_capable+0x40/0x40 [ 43.345895] ? __lock_acquire+0x1651/0x4620 [ 43.346482] ? lockdep_invariant_state+0xdb/0x120 [ 43.350435] ? syscall_return_slowpath+0x2b3/0x500 [ 43.355337] ? finish_task_switch+0x1aa/0x740 [ 43.359809] ? security_file_ioctl+0x7d/0xb0 [ 43.364185] ? security_file_ioctl+0x89/0xb0 [ 43.368570] SyS_ioctl+0x8f/0xc0 [ 43.371916] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 43.376644] RIP: 0033:0x44ba59 [ 43.379805] RSP: 002b:00007fd168d0ad08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 43.387488] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044ba59 [ 43.394730] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 [ 43.401971] RBP: 0000000000000082 R08: 00007fd168d0b700 R09: 00007fd168d0b700 [ 43.409214] R10: 00007fd168d0b700 R11: 0000000000000246 R12: 0000000000000000 [ 43.416455] R13: 00000000007ef91f R14: 00007fd168d0b9c0 R15: 0000000000000000 [ 43.423791] [ 43.425906] ============================= [ 43.430056] WARNING: suspicious RCU usage [ 43.434198] 4.13.0-mm1+ #7 Not tainted [ 43.438084] ----------------------------- [ 43.442223] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 43.450116] [ 43.450116] other info that might help us debug this: [ 43.450116] [ 43.458251] [ 43.458251] rcu_scheduler_active = 2, debug_locks = 1 [ 43.464917] no locks held by syzkaller217505/3815. [ 43.469835] [ 43.469835] stack backtrace: [ 43.474338] CPU: 0 PID: 3815 Comm: syzkaller217505 Not tainted 4.13.0-mm1+ #7 [ 43.481581] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.490907] Call Trace: [ 43.493474] dump_stack+0x194/0x257 [ 43.497082] ? arch_local_irq_restore+0x53/0x53 [ 43.501740] lockdep_rcu_suspicious+0x123/0x170 [ 43.506389] kvm_dev_ioctl+0xd21/0x1840 [ 43.510345] ? install_new_memslots+0x420/0x420 [ 43.515002] ? avc_has_extended_perms+0x7fa/0x12c0 [ 43.519900] ? lock_downgrade+0x990/0x990 [ 43.524028] ? avc_ss_reset+0x110/0x110 [ 43.527978] ? lock_release+0xd70/0xd70 [ 43.531927] ? __lock_is_held+0xbc/0x140 [ 43.535984] ? check_same_owner+0x320/0x320 [ 43.540289] ? rcu_pm_notify+0xc0/0xc0 [ 43.544158] ? install_new_memslots+0x420/0x420 [ 43.548800] do_vfs_ioctl+0x1b1/0x1530 [ 43.552664] ? ioctl_preallocate+0x2b0/0x2b0 [ 43.557045] ? selinux_capable+0x40/0x40 [ 43.561077] ? __lock_acquire+0x1651/0x4620 [ 43.565376] ? lockdep_invariant_state+0xdb/0x120 [ 43.570195] ? syscall_return_slowpath+0x2b3/0x500 [ 43.575097] ? finish_task_switch+0x1aa/0x740 [ 43.579572] ? security_file_ioctl+0x7d/0xb0 [ 43.583950] ? security_file_ioctl+0x89/0xb0 [ 43.588334] SyS_ioctl+0x8f/0xc0 [ 43.591679] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 43.596404] RIP: 0033:0x44ba59 [ 43.599566] RSP: 002b:00007fd168d0ad08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 43.607247] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044ba59 [ 43.614819] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 executing program [ 43.622060] RBP: 0000000000000082 R08: 00007fd168d0b700 R09: 00007fd168d0b700 [ 43.629300] R10: 00007fd168d0b700 R11: 0000000000000246 R12: 0000000000000000 [ 43.636541] R13: 00000000007ef91f R14: 00007fd168d0b9c0 R15: 0000000000000000 executing program executing program executing program executing program executing program executing program executing program executing program