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-5,10.128.0.13' (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 syzkaller login: [ 36.995146] [ 36.996606] ============================= [ 36.998148] WARNING: suspicious RCU usage [ 36.999925] 4.13.0-mm1+ #7 Not tainted [ 37.001708] ----------------------------- [ 37.003515] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 37.005126] [ 37.005126] other info that might help us debug this: [ 37.005126] [ 37.006406] [ 37.006406] rcu_scheduler_active = 2, debug_locks = 1 [ 37.007866] no locks held by syzkaller000014/3830. [ 37.008788] [ 37.008788] stack backtrace: [ 37.009490] CPU: 1 PID: 3830 Comm: syzkaller000014 Not tainted 4.13.0-mm1+ #7 [ 37.010447] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.011731] Call Trace: [ 37.012096] dump_stack+0x194/0x257 [ 37.012592] ? arch_local_irq_restore+0x53/0x53 [ 37.013230] lockdep_rcu_suspicious+0x123/0x170 [ 37.013861] kvm_dev_ioctl+0x877/0x1840 [ 37.014409] ? install_new_memslots+0x420/0x420 [ 37.015084] ? avc_has_extended_perms+0x7fa/0x12c0 [ 37.015754] ? lock_downgrade+0x990/0x990 [ 37.019888] ? avc_ss_reset+0x110/0x110 [ 37.023848] ? lock_release+0xd70/0xd70 [ 37.027800] ? __lock_is_held+0xbc/0x140 [ 37.031861] ? check_same_owner+0x320/0x320 [ 37.036161] ? rcu_pm_notify+0xc0/0xc0 [ 37.040036] ? install_new_memslots+0x420/0x420 [ 37.044681] do_vfs_ioctl+0x1b1/0x1530 [ 37.048549] ? ioctl_preallocate+0x2b0/0x2b0 [ 37.053078] ? selinux_capable+0x40/0x40 [ 37.057114] ? __lock_acquire+0x1651/0x4620 [ 37.061416] ? lockdep_invariant_state+0xdb/0x120 [ 37.066231] ? syscall_return_slowpath+0x2b3/0x500 [ 37.071131] ? finish_task_switch+0x1aa/0x740 [ 37.075608] ? security_file_ioctl+0x7d/0xb0 [ 37.079994] ? security_file_ioctl+0x89/0xb0 [ 37.084381] SyS_ioctl+0x8f/0xc0 [ 37.087740] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 37.092471] RIP: 0033:0x446209 executing program executing program [ 37.095640] RSP: 002b:00007fa689480dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 37.103332] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 37.110573] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 37.117814] RBP: 0000000000000082 R08: 00007fa689481700 R09: 00007fa689481700 [ 37.125058] R10: 00007fa689481700 R11: 0000000000000246 R12: 0000000000000000 [ 37.132300] R13: 00007fff9c86301f R14: 00007fa6894819c0 R15: 0000000000000000 [ 37.139708] [ 37.141816] ============================= executing program executing program executing program executing program executing program executing program [ 37.145990] WARNING: suspicious RCU usage [ 37.153431] 4.13.0-mm1+ #7 Not tainted [ 37.160866] ----------------------------- [ 37.165816] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 37.175250] [ 37.175250] other info that might help us debug this: [ 37.175250] [ 37.187087] [ 37.187087] rcu_scheduler_active = 2, debug_locks = 1 executing program executing program [ 37.203646] no locks held by syzkaller000014/3830. [ 37.214585] [ 37.214585] stack backtrace: [ 37.219869] CPU: 1 PID: 3830 Comm: syzkaller000014 Not tainted 4.13.0-mm1+ #7 [ 37.227123] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.236453] Call Trace: [ 37.239018] dump_stack+0x194/0x257 [ 37.242621] ? arch_local_irq_restore+0x53/0x53 [ 37.247275] lockdep_rcu_suspicious+0x123/0x170 executing program executing program executing program executing program [ 37.251919] kvm_dev_ioctl+0xd21/0x1840 [ 37.255871] ? install_new_memslots+0x420/0x420 [ 37.260528] ? avc_has_extended_perms+0x7fa/0x12c0 [ 37.265425] ? lock_downgrade+0x990/0x990 [ 37.269572] ? avc_ss_reset+0x110/0x110 [ 37.273534] ? lock_release+0xd70/0xd70 [ 37.277490] ? __lock_is_held+0xbc/0x140 [ 37.281552] ? check_same_owner+0x320/0x320 [ 37.285844] ? rcu_pm_notify+0xc0/0xc0 [ 37.289724] ? install_new_memslots+0x420/0x420 [ 37.294376] do_vfs_ioctl+0x1b1/0x1530 [ 37.298244] ? ioctl_preallocate+0x2b0/0x2b0 executing program executing program [ 37.302627] ? selinux_capable+0x40/0x40 [ 37.306662] ? __lock_acquire+0x1651/0x4620 [ 37.310967] ? lockdep_invariant_state+0xdb/0x120 [ 37.315781] ? syscall_return_slowpath+0x2b3/0x500 [ 37.320679] ? finish_task_switch+0x1aa/0x740 [ 37.325156] ? security_file_ioctl+0x7d/0xb0 [ 37.329532] ? security_file_ioctl+0x89/0xb0 [ 37.333913] SyS_ioctl+0x8f/0xc0 [ 37.337259] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 37.341984] RIP: 0033:0x446209 [ 37.345144] RSP: 002b:00007fa689480dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 executing program executing program executing program executing program executing program executing program executing program executing program [ 37.352822] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 37.360072] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 37.367310] RBP: 0000000000000082 R08: 00007fa689481700 R09: 00007fa689481700 [ 37.374548] R10: 00007fa689481700 R11: 0000000000000246 R12: 0000000000000000 [ 37.381787] R13: 00007fff9c86301f R14: 00007fa6894819c0 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program