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-kasan-gce-6,10.128.0.15' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 56.479344] [ 56.479764] ============================= [ 56.481560] WARNING: suspicious RCU usage executing program executing program executing program executing program executing program [ 56.501421] 4.13.0-rc5+ #43 Not tainted [ 56.518226] ----------------------------- [ 56.537824] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! executing program executing program [ 56.577888] [ 56.577888] other info that might help us debug this: [ 56.577888] [ 56.593008] [ 56.593008] rcu_scheduler_active = 2, debug_locks = 1 executing program executing program executing program [ 56.624051] no locks held by syzkaller950707/8436. [ 56.631568] [ 56.631568] stack backtrace: [ 56.650353] CPU: 0 PID: 8436 Comm: syzkaller950707 Not tainted 4.13.0-rc5+ #43 [ 56.657720] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.667072] Call Trace: [ 56.669649] dump_stack+0x194/0x257 [ 56.673273] ? arch_local_irq_restore+0x53/0x53 [ 56.677952] lockdep_rcu_suspicious+0x123/0x170 [ 56.682619] kvm_dev_ioctl+0x877/0x1840 [ 56.686585] ? lock_downgrade+0x990/0x990 [ 56.690736] ? install_new_memslots+0x420/0x420 [ 56.695434] ? avc_has_extended_perms+0x7fa/0x12c0 [ 56.700350] ? find_held_lock+0x35/0x1d0 [ 56.704440] ? avc_ss_reset+0x110/0x110 [ 56.708416] ? lock_downgrade+0x990/0x990 [ 56.712592] ? lock_release+0xa40/0xa40 [ 56.716558] ? __lock_is_held+0xb6/0x140 [ 56.720650] ? check_same_owner+0x320/0x320 [ 56.724967] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 56.730073] ? install_new_memslots+0x420/0x420 [ 56.734767] do_vfs_ioctl+0x1b1/0x1520 [ 56.738656] ? ioctl_preallocate+0x2b0/0x2b0 [ 56.743087] ? selinux_capable+0x40/0x40 [ 56.747167] ? syscall_return_slowpath+0x22f/0x450 [ 56.752100] ? security_file_ioctl+0x7d/0xb0 [ 56.756499] ? security_file_ioctl+0x89/0xb0 [ 56.760907] SyS_ioctl+0x8f/0xc0 [ 56.764274] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 56.769037] RIP: 0033:0x4490f9 executing program executing program executing program executing program executing program [ 56.772244] RSP: 002b:00007f2a35a44dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 56.779966] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004490f9 [ 56.787223] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 56.794491] RBP: 0000000000000086 R08: 00007f2a35a45700 R09: 00007f2a35a45700 [ 56.801751] R10: 00007f2a35a45700 R11: 0000000000000202 R12: 0000000000000000 [ 56.809008] R13: 00007ffd8eeee49f R14: 00007f2a35a459c0 R15: 0000000000000000 [ 56.816597] executing program executing program executing program executing program executing program executing program executing program [ 56.888125] ============================= [ 56.893648] WARNING: suspicious RCU usage [ 56.901526] 4.13.0-rc5+ #43 Not tainted [ 56.910823] ----------------------------- [ 56.930617] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! executing program executing program executing program executing program [ 56.948570] [ 56.948570] other info that might help us debug this: [ 56.948570] [ 56.969263] [ 56.969263] rcu_scheduler_active = 2, debug_locks = 1 [ 56.980480] no locks held by syzkaller950707/8436. executing program [ 56.997490] [ 56.997490] stack backtrace: [ 57.014618] CPU: 0 PID: 8436 Comm: syzkaller950707 Not tainted 4.13.0-rc5+ #43 [ 57.021974] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.031311] Call Trace: [ 57.033889] dump_stack+0x194/0x257 [ 57.037516] ? arch_local_irq_restore+0x53/0x53 [ 57.042196] lockdep_rcu_suspicious+0x123/0x170 [ 57.046864] kvm_dev_ioctl+0xd21/0x1840 [ 57.050826] ? lock_downgrade+0x990/0x990 [ 57.054976] ? install_new_memslots+0x420/0x420 [ 57.059656] ? avc_has_extended_perms+0x7fa/0x12c0 [ 57.064582] ? find_held_lock+0x35/0x1d0 [ 57.068650] ? avc_ss_reset+0x110/0x110 [ 57.072612] ? lock_downgrade+0x990/0x990 [ 57.076930] ? lock_release+0xa40/0xa40 [ 57.080897] ? __lock_is_held+0xb6/0x140 [ 57.085033] ? check_same_owner+0x320/0x320 [ 57.089365] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 57.094484] ? install_new_memslots+0x420/0x420 [ 57.099142] do_vfs_ioctl+0x1b1/0x1520 [ 57.103031] ? ioctl_preallocate+0x2b0/0x2b0 [ 57.107434] ? selinux_capable+0x40/0x40 [ 57.111529] ? syscall_return_slowpath+0x22f/0x450 [ 57.116476] ? security_file_ioctl+0x7d/0xb0 [ 57.120873] ? security_file_ioctl+0x89/0xb0 [ 57.125279] SyS_ioctl+0x8f/0xc0 [ 57.128642] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 57.133384] RIP: 0033:0x4490f9 [ 57.136560] RSP: 002b:00007f2a35a44dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 executing program executing program executing program executing program executing program executing program executing program [ 57.144256] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004490f9 [ 57.151509] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 57.158767] RBP: 0000000000000086 R08: 00007f2a35a45700 R09: 00007f2a35a45700 [ 57.166026] R10: 00007f2a35a45700 R11: 0000000000000202 R12: 0000000000000000 [ 57.173282] R13: 00007ffd8eeee49f R14: 00007f2a35a459c0 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