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-3,10.128.0.5' (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 syzkaller login: [ 37.289347] [ 37.294247] ============================= [ 37.318397] WARNING: suspicious RCU usage [ 37.329098] 4.13.0-rc5+ #43 Not tainted executing program [ 37.337227] ----------------------------- [ 37.348756] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! executing program executing program executing program [ 37.398407] [ 37.398407] other info that might help us debug this: [ 37.398407] [ 37.419090] [ 37.419090] rcu_scheduler_active = 2, debug_locks = 1 [ 37.428228] no locks held by syzkaller231910/7654. [ 37.439766] [ 37.439766] stack backtrace: executing program [ 37.450461] CPU: 1 PID: 7654 Comm: syzkaller231910 Not tainted 4.13.0-rc5+ #43 [ 37.457826] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.467164] Call Trace: [ 37.469741] dump_stack+0x194/0x257 [ 37.473362] ? arch_local_irq_restore+0x53/0x53 [ 37.478040] lockdep_rcu_suspicious+0x123/0x170 [ 37.482705] kvm_dev_ioctl+0x877/0x1840 [ 37.486677] ? lock_downgrade+0x990/0x990 [ 37.490836] ? install_new_memslots+0x420/0x420 [ 37.495552] ? avc_has_extended_perms+0x7fa/0x12c0 [ 37.500467] ? find_held_lock+0x35/0x1d0 [ 37.504535] ? avc_ss_reset+0x110/0x110 [ 37.508498] ? lock_downgrade+0x990/0x990 [ 37.512639] ? lock_release+0xa40/0xa40 [ 37.516608] ? __lock_is_held+0xb6/0x140 [ 37.520703] ? check_same_owner+0x320/0x320 [ 37.525017] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 37.530124] ? install_new_memslots+0x420/0x420 [ 37.534783] do_vfs_ioctl+0x1b1/0x1520 [ 37.538669] ? ioctl_preallocate+0x2b0/0x2b0 [ 37.543071] ? selinux_capable+0x40/0x40 [ 37.547139] ? syscall_return_slowpath+0x22f/0x450 [ 37.552070] ? security_file_ioctl+0x7d/0xb0 [ 37.556476] ? security_file_ioctl+0x89/0xb0 [ 37.560877] SyS_ioctl+0x8f/0xc0 [ 37.564241] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 37.568994] RIP: 0033:0x4490c9 [ 37.572172] RSP: 002b:00007fab52c96dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 37.579882] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004490c9 [ 37.587134] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 executing program executing program executing program executing program [ 37.594390] RBP: 0000000000000086 R08: 00007fab52c97700 R09: 00007fab52c97700 [ 37.601644] R10: 00007fab52c97700 R11: 0000000000000202 R12: 0000000000000000 [ 37.608897] R13: 00007fff12e950cf R14: 00007fab52c979c0 R15: 0000000000000000 [ 37.616408] [ 37.640151] ============================= [ 37.645104] WARNING: suspicious RCU usage executing program executing program executing program [ 37.654631] 4.13.0-rc5+ #43 Not tainted [ 37.661344] ----------------------------- [ 37.670557] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! executing program executing program executing program executing program executing program [ 37.710621] [ 37.710621] other info that might help us debug this: [ 37.710621] [ 37.722751] [ 37.722751] rcu_scheduler_active = 2, debug_locks = 1 [ 37.732075] no locks held by syzkaller231910/7654. [ 37.752529] [ 37.752529] stack backtrace: executing program [ 37.761768] CPU: 1 PID: 7654 Comm: syzkaller231910 Not tainted 4.13.0-rc5+ #43 [ 37.769122] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.778460] Call Trace: [ 37.781035] dump_stack+0x194/0x257 [ 37.784659] ? arch_local_irq_restore+0x53/0x53 [ 37.789343] lockdep_rcu_suspicious+0x123/0x170 [ 37.794011] kvm_dev_ioctl+0xd21/0x1840 [ 37.797972] ? lock_downgrade+0x990/0x990 [ 37.802125] ? install_new_memslots+0x420/0x420 [ 37.806810] ? avc_has_extended_perms+0x7fa/0x12c0 executing program executing program [ 37.811721] ? find_held_lock+0x35/0x1d0 [ 37.815792] ? avc_ss_reset+0x110/0x110 [ 37.819750] ? lock_downgrade+0x990/0x990 [ 37.823893] ? lock_release+0xa40/0xa40 [ 37.827861] ? __lock_is_held+0xb6/0x140 [ 37.831954] ? check_same_owner+0x320/0x320 [ 37.836268] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 37.841379] ? install_new_memslots+0x420/0x420 [ 37.846037] do_vfs_ioctl+0x1b1/0x1520 [ 37.849926] ? ioctl_preallocate+0x2b0/0x2b0 [ 37.854336] ? selinux_capable+0x40/0x40 executing program executing program [ 37.858402] ? syscall_return_slowpath+0x22f/0x450 [ 37.863338] ? security_file_ioctl+0x7d/0xb0 [ 37.867736] ? security_file_ioctl+0x89/0xb0 [ 37.872142] SyS_ioctl+0x8f/0xc0 [ 37.875508] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 37.880249] RIP: 0033:0x4490c9 [ 37.883426] RSP: 002b:00007fab52c96dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 37.891120] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004490c9 [ 37.898372] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 executing program executing program executing program executing program [ 37.905626] RBP: 0000000000000086 R08: 00007fab52c97700 R09: 00007fab52c97700 [ 37.912879] R10: 00007fab52c97700 R11: 0000000000000202 R12: 0000000000000000 [ 37.920134] R13: 00007fff12e950cf R14: 00007fab52c979c0 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