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-9,10.128.0.41' (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 syzkaller login: [ 47.416502] [ 47.417220] ============================= [ 47.417868] WARNING: suspicious RCU usage [ 47.422277] 4.13.0-rc6+ #50 Not tainted [ 47.425408] ----------------------------- [ 47.427812] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 47.431772] [ 47.431772] other info that might help us debug this: [ 47.431772] [ 47.434191] [ 47.434191] rcu_scheduler_active = 2, debug_locks = 1 [ 47.435727] no locks held by syzkaller689810/5328. [ 47.437117] [ 47.437117] stack backtrace: [ 47.443384] CPU: 0 PID: 5328 Comm: syzkaller689810 Not tainted 4.13.0-rc6+ #50 [ 47.450747] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.460084] Call Trace: [ 47.462659] dump_stack+0x194/0x257 [ 47.466276] ? arch_local_irq_restore+0x53/0x53 [ 47.470951] lockdep_rcu_suspicious+0x123/0x170 [ 47.475616] kvm_dev_ioctl+0x877/0x1840 [ 47.479577] ? lock_downgrade+0x990/0x990 [ 47.483730] ? install_new_memslots+0x420/0x420 [ 47.488413] ? avc_has_extended_perms+0x7fa/0x12c0 [ 47.493332] ? find_held_lock+0x35/0x1d0 [ 47.497404] ? avc_ss_reset+0x110/0x110 [ 47.501371] ? lock_downgrade+0x990/0x990 [ 47.505544] ? lock_release+0xa40/0xa40 [ 47.509512] ? __lock_is_held+0xb6/0x140 [ 47.513605] ? check_same_owner+0x320/0x320 [ 47.517921] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 47.523028] ? install_new_memslots+0x420/0x420 [ 47.527687] do_vfs_ioctl+0x1b1/0x1520 [ 47.531573] ? ioctl_preallocate+0x2b0/0x2b0 [ 47.535980] ? selinux_capable+0x40/0x40 [ 47.540051] ? syscall_return_slowpath+0x22f/0x450 [ 47.544982] ? security_file_ioctl+0x7d/0xb0 [ 47.549380] ? security_file_ioctl+0x89/0xb0 [ 47.553785] SyS_ioctl+0x8f/0xc0 [ 47.557151] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 47.561894] RIP: 0033:0x446209 executing program executing program [ 47.565066] RSP: 002b:00007f2a3bc3bdc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 47.572763] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 47.580017] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 47.587273] RBP: 0000000000000086 R08: 00007f2a3bc3c700 R09: 00007f2a3bc3c700 [ 47.594529] R10: 00007f2a3bc3c700 R11: 0000000000000246 R12: 0000000000000000 [ 47.601786] R13: 00007fff309d2c4f R14: 00007f2a3bc3c9c0 R15: 0000000000000000 [ 47.609272] executing program executing program executing program executing program executing program executing program executing program executing program [ 47.615876] ============================= [ 47.620454] WARNING: suspicious RCU usage [ 47.626131] 4.13.0-rc6+ #50 Not tainted [ 47.632321] ----------------------------- [ 47.642797] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 47.657460] [ 47.657460] other info that might help us debug this: [ 47.657460] executing program [ 47.679372] [ 47.679372] rcu_scheduler_active = 2, debug_locks = 1 [ 47.691986] no locks held by syzkaller689810/5328. [ 47.700965] [ 47.700965] stack backtrace: [ 47.711925] CPU: 0 PID: 5328 Comm: syzkaller689810 Not tainted 4.13.0-rc6+ #50 [ 47.719288] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.728626] Call Trace: [ 47.731202] dump_stack+0x194/0x257 [ 47.734822] ? arch_local_irq_restore+0x53/0x53 [ 47.739499] lockdep_rcu_suspicious+0x123/0x170 [ 47.744164] kvm_dev_ioctl+0xd21/0x1840 [ 47.748125] ? lock_downgrade+0x990/0x990 [ 47.752275] ? install_new_memslots+0x420/0x420 [ 47.756954] ? avc_has_extended_perms+0x7fa/0x12c0 [ 47.761873] ? find_held_lock+0x35/0x1d0 [ 47.765941] ? avc_ss_reset+0x110/0x110 [ 47.769902] ? lock_downgrade+0x990/0x990 [ 47.774043] ? lock_release+0xa40/0xa40 [ 47.778011] ? __lock_is_held+0xb6/0x140 [ 47.782107] ? check_same_owner+0x320/0x320 [ 47.786429] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 47.791539] ? install_new_memslots+0x420/0x420 [ 47.796207] do_vfs_ioctl+0x1b1/0x1520 [ 47.800103] ? ioctl_preallocate+0x2b0/0x2b0 [ 47.804510] ? selinux_capable+0x40/0x40 [ 47.808580] ? syscall_return_slowpath+0x22f/0x450 [ 47.813517] ? security_file_ioctl+0x7d/0xb0 [ 47.817915] ? security_file_ioctl+0x89/0xb0 [ 47.822324] SyS_ioctl+0x8f/0xc0 executing program executing program executing program executing program executing program executing program executing program [ 47.825691] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 47.830432] RIP: 0033:0x446209 [ 47.833608] RSP: 002b:00007f2a3bc3bdc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 47.841308] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 47.848567] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 47.855823] RBP: 0000000000000086 R08: 00007f2a3bc3c700 R09: 00007f2a3bc3c700 [ 47.863078] R10: 00007f2a3bc3c700 R11: 0000000000000246 R12: 0000000000000000 [ 47.870348] R13: 00007fff309d2c4f R14: 00007f2a3bc3c9c0 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