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-4,10.128.0.52' (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 syzkaller login: [ 42.277978] [ 42.294812] ============================= executing program executing program executing program [ 42.328763] WARNING: suspicious RCU usage executing program [ 42.350653] 4.13.0-mm1+ #7 Not tainted [ 42.365628] ----------------------------- executing program executing program executing program executing program [ 42.400867] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! executing program executing program executing program executing program [ 42.447595] [ 42.447595] other info that might help us debug this: [ 42.447595] [ 42.485743] [ 42.485743] rcu_scheduler_active = 2, debug_locks = 1 executing program executing program executing program executing program [ 42.532518] no locks held by syzkaller504061/4868. [ 42.577600] [ 42.577600] stack backtrace: [ 42.588358] CPU: 0 PID: 4868 Comm: syzkaller504061 Not tainted 4.13.0-mm1+ #7 [ 42.595668] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.605019] Call Trace: [ 42.607610] dump_stack+0x194/0x257 [ 42.611246] ? arch_local_irq_restore+0x53/0x53 [ 42.615941] lockdep_rcu_suspicious+0x123/0x170 [ 42.620616] kvm_dev_ioctl+0x877/0x1840 [ 42.624614] ? install_new_memslots+0x420/0x420 [ 42.629318] ? avc_has_extended_perms+0x7fa/0x12c0 [ 42.634244] ? lock_downgrade+0x990/0x990 [ 42.638405] ? avc_ss_reset+0x110/0x110 [ 42.642387] ? lock_release+0xd70/0xd70 [ 42.646367] ? __lock_is_held+0xbc/0x140 [ 42.650473] ? check_same_owner+0x320/0x320 [ 42.654805] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 42.659923] ? install_new_memslots+0x420/0x420 [ 42.664587] do_vfs_ioctl+0x1b1/0x1530 [ 42.668481] ? ioctl_preallocate+0x2b0/0x2b0 [ 42.672892] ? selinux_capable+0x40/0x40 [ 42.676986] ? lockdep_invariant_state+0xdb/0x120 [ 42.681828] ? syscall_return_slowpath+0x2b3/0x500 [ 42.686756] ? finish_task_switch+0x4c9/0x740 [ 42.691263] ? security_file_ioctl+0x7d/0xb0 [ 42.695663] ? security_file_ioctl+0x89/0xb0 [ 42.700085] SyS_ioctl+0x8f/0xc0 [ 42.703459] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 42.708203] RIP: 0033:0x449129 [ 42.711381] RSP: 002b:00007ff658bf4dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 42.719089] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000449129 executing program executing program executing program [ 42.726353] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 42.733619] RBP: 0000000000000082 R08: 00007ff658bf5700 R09: 00007ff658bf5700 [ 42.740888] R10: 00007ff658bf5700 R11: 0000000000000202 R12: 0000000000000000 [ 42.748155] R13: 00007fff5d4e758f R14: 00007ff658bf59c0 R15: 0000000000000000 [ 42.755727] [ 42.764128] ============================= [ 42.768485] WARNING: suspicious RCU usage executing program executing program executing program [ 42.774977] 4.13.0-mm1+ #7 Not tainted [ 42.779735] ----------------------------- [ 42.795834] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! executing program executing program executing program [ 42.818674] [ 42.818674] other info that might help us debug this: [ 42.818674] [ 42.831547] [ 42.831547] rcu_scheduler_active = 2, debug_locks = 1 [ 42.863008] no locks held by syzkaller504061/4868. [ 42.876094] [ 42.876094] stack backtrace: [ 42.889988] CPU: 0 PID: 4868 Comm: syzkaller504061 Not tainted 4.13.0-mm1+ #7 [ 42.897300] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.906660] Call Trace: [ 42.909252] dump_stack+0x194/0x257 [ 42.912886] ? arch_local_irq_restore+0x53/0x53 [ 42.917575] lockdep_rcu_suspicious+0x123/0x170 [ 42.922249] kvm_dev_ioctl+0xd21/0x1840 [ 42.926242] ? install_new_memslots+0x420/0x420 [ 42.930937] ? avc_has_extended_perms+0x7fa/0x12c0 [ 42.935865] ? lock_downgrade+0x990/0x990 [ 42.940029] ? avc_ss_reset+0x110/0x110 [ 42.944011] ? lock_release+0xd70/0xd70 [ 42.947992] ? __lock_is_held+0xbc/0x140 [ 42.952097] ? check_same_owner+0x320/0x320 [ 42.956425] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 42.961570] ? install_new_memslots+0x420/0x420 [ 42.966242] do_vfs_ioctl+0x1b1/0x1530 [ 42.970139] ? ioctl_preallocate+0x2b0/0x2b0 [ 42.974553] ? selinux_capable+0x40/0x40 [ 42.978628] ? lockdep_invariant_state+0xdb/0x120 [ 42.983474] ? syscall_return_slowpath+0x2b3/0x500 [ 42.988404] ? finish_task_switch+0x4c9/0x740 [ 42.992913] ? security_file_ioctl+0x7d/0xb0 [ 42.997325] ? security_file_ioctl+0x89/0xb0 [ 43.001748] SyS_ioctl+0x8f/0xc0 [ 43.005134] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 43.009886] RIP: 0033:0x449129 executing program executing program executing program executing program [ 43.013081] RSP: 002b:00007ff658bf4dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 43.020793] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000449129 [ 43.028060] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 43.035325] RBP: 0000000000000082 R08: 00007ff658bf5700 R09: 00007ff658bf5700 [ 43.042595] R10: 00007ff658bf5700 R11: 0000000000000202 R12: 0000000000000000 [ 43.049863] R13: 00007fff5d4e758f R14: 00007ff658bf59c0 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