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-0,10.128.15.204' (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 syzkaller login: [ 33.375043] hrtimer: interrupt took 32892 ns executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 34.303858] [ 34.306787] ============================= [ 34.312165] WARNING: suspicious RCU usage [ 34.316940] 4.13.0-rc7+ #64 Not tainted [ 34.321246] ----------------------------- [ 34.325445] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 34.333362] [ 34.333362] other info that might help us debug this: [ 34.333362] [ 34.342145] [ 34.342145] rcu_scheduler_active = 2, debug_locks = 1 executing program executing program executing program [ 34.349469] no locks held by syzkaller419470/3847. [ 34.354833] [ 34.354833] stack backtrace: [ 34.361123] CPU: 1 PID: 3847 Comm: syzkaller419470 Not tainted 4.13.0-rc7+ #64 [ 34.368457] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.377786] Call Trace: [ 34.380357] dump_stack+0x194/0x257 [ 34.383971] ? arch_local_irq_restore+0x53/0x53 [ 34.388618] lockdep_rcu_suspicious+0x123/0x170 [ 34.393260] kvm_dev_ioctl+0x877/0x1840 [ 34.397213] ? lock_downgrade+0x990/0x990 executing program executing program executing program [ 34.401356] ? install_new_memslots+0x420/0x420 [ 34.406009] ? avc_has_extended_perms+0x7fa/0x12c0 [ 34.410909] ? find_held_lock+0x35/0x1d0 [ 34.414951] ? avc_ss_reset+0x110/0x110 [ 34.418893] ? lock_downgrade+0x990/0x990 [ 34.423011] ? lock_release+0xa40/0xa40 [ 34.426966] ? __lock_is_held+0xb6/0x140 [ 34.431025] ? check_same_owner+0x320/0x320 [ 34.435328] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 34.440408] ? install_new_memslots+0x420/0x420 [ 34.445053] do_vfs_ioctl+0x1b1/0x1520 [ 34.448916] ? ioctl_preallocate+0x2b0/0x2b0 executing program executing program executing program executing program [ 34.453313] ? selinux_capable+0x40/0x40 [ 34.457361] ? syscall_return_slowpath+0x22f/0x450 [ 34.462282] ? security_file_ioctl+0x7d/0xb0 [ 34.466672] ? security_file_ioctl+0x89/0xb0 [ 34.471054] SyS_ioctl+0x8f/0xc0 [ 34.474395] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 34.479117] RIP: 0033:0x446369 [ 34.482272] RSP: 002b:00007ff1f39afdc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 34.489967] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446369 [ 34.497207] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000005 executing program executing program executing program executing program [ 34.504446] RBP: 0000000000000086 R08: 00007ff1f39b0700 R09: 00007ff1f39b0700 [ 34.511684] R10: 00007ff1f39b0700 R11: 0000000000000246 R12: 0000000000000000 [ 34.518926] R13: 00007ffdcc4b8ebf R14: 00007ff1f39b09c0 R15: 0000000000000000 [ 34.526325] [ 34.531793] ============================= [ 34.539520] WARNING: suspicious RCU usage [ 34.545160] 4.13.0-rc7+ #64 Not tainted executing program executing program executing program [ 34.551479] ----------------------------- [ 34.559843] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 34.577883] [ 34.577883] other info that might help us debug this: [ 34.577883] [ 34.587208] [ 34.587208] rcu_scheduler_active = 2, debug_locks = 1 [ 34.598955] no locks held by syzkaller419470/3847. [ 34.606643] [ 34.606643] stack backtrace: [ 34.611766] CPU: 1 PID: 3847 Comm: syzkaller419470 Not tainted 4.13.0-rc7+ #64 [ 34.619101] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.628420] Call Trace: [ 34.631003] dump_stack+0x194/0x257 [ 34.634604] ? arch_local_irq_restore+0x53/0x53 [ 34.639249] lockdep_rcu_suspicious+0x123/0x170 [ 34.643891] kvm_dev_ioctl+0xd21/0x1840 [ 34.647831] ? lock_downgrade+0x990/0x990 [ 34.651954] ? install_new_memslots+0x420/0x420 [ 34.656606] ? avc_has_extended_perms+0x7fa/0x12c0 [ 34.661506] ? find_held_lock+0x35/0x1d0 [ 34.665562] ? avc_ss_reset+0x110/0x110 [ 34.669516] ? lock_downgrade+0x990/0x990 [ 34.673646] ? lock_release+0xa40/0xa40 [ 34.677594] ? __lock_is_held+0xb6/0x140 [ 34.681662] ? check_same_owner+0x320/0x320 [ 34.685953] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 34.691051] ? install_new_memslots+0x420/0x420 [ 34.695692] do_vfs_ioctl+0x1b1/0x1520 [ 34.699554] ? ioctl_preallocate+0x2b0/0x2b0 [ 34.703951] ? selinux_capable+0x40/0x40 [ 34.707991] ? syscall_return_slowpath+0x22f/0x450 [ 34.712896] ? security_file_ioctl+0x7d/0xb0 [ 34.717277] ? security_file_ioctl+0x89/0xb0 [ 34.721661] SyS_ioctl+0x8f/0xc0 [ 34.724999] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 34.729729] RIP: 0033:0x446369 [ 34.732883] RSP: 002b:00007ff1f39afdc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 34.740556] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446369 [ 34.747796] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000005 executing program executing program executing program executing program executing program executing program [ 34.755051] RBP: 0000000000000086 R08: 00007ff1f39b0700 R09: 00007ff1f39b0700 [ 34.762305] R10: 00007ff1f39b0700 R11: 0000000000000246 R12: 0000000000000000 [ 34.769562] R13: 00007ffdcc4b8ebf R14: 00007ff1f39b09c0 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