INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-upstream-kasan-gce-3,10.128.15.213' (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 syzkaller login: [ 45.453217] [ 45.462893] ============================= [ 45.466903] WARNING: suspicious RCU usage [ 45.469399] 4.13.0-rc6+ #47 Not tainted [ 45.469992] ----------------------------- [ 45.472880] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! executing program executing program [ 45.501293] [ 45.501293] other info that might help us debug this: [ 45.501293] [ 45.513424] [ 45.513424] rcu_scheduler_active = 2, debug_locks = 1 [ 45.523986] no locks held by syzkaller540614/6424. [ 45.530968] [ 45.530968] stack backtrace: [ 45.537304] CPU: 1 PID: 6424 Comm: syzkaller540614 Not tainted 4.13.0-rc6+ #47 [ 45.544661] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.553996] Call Trace: [ 45.556574] dump_stack+0x194/0x257 [ 45.560197] ? arch_local_irq_restore+0x53/0x53 [ 45.564877] lockdep_rcu_suspicious+0x123/0x170 [ 45.569542] kvm_dev_ioctl+0x877/0x1840 [ 45.573510] ? lock_downgrade+0x990/0x990 [ 45.577659] ? install_new_memslots+0x420/0x420 [ 45.582348] ? avc_has_extended_perms+0x7fa/0x12c0 [ 45.587262] ? find_held_lock+0x35/0x1d0 [ 45.591330] ? avc_ss_reset+0x110/0x110 [ 45.595294] ? lock_downgrade+0x990/0x990 [ 45.599438] ? lock_release+0xa40/0xa40 [ 45.603407] ? __lock_is_held+0xb6/0x140 [ 45.607506] ? check_same_owner+0x320/0x320 [ 45.611823] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 45.616929] ? install_new_memslots+0x420/0x420 [ 45.621591] do_vfs_ioctl+0x1b1/0x1520 [ 45.625476] ? ioctl_preallocate+0x2b0/0x2b0 [ 45.629884] ? selinux_capable+0x40/0x40 [ 45.633953] ? syscall_return_slowpath+0x22f/0x450 [ 45.638884] ? security_file_ioctl+0x7d/0xb0 [ 45.643282] ? security_file_ioctl+0x89/0xb0 [ 45.647687] SyS_ioctl+0x8f/0xc0 [ 45.651055] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 45.655796] RIP: 0033:0x446369 [ 45.658973] RSP: 002b:00007f98b455ddc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 45.666672] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446369 [ 45.673925] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 [ 45.681181] RBP: 0000000000000086 R08: 00007f98b455e700 R09: 00007f98b455e700 [ 45.688437] R10: 00007f98b455e700 R11: 0000000000000246 R12: 0000000000000000 executing program executing program executing program executing program executing program executing program [ 45.695697] R13: 00007fff6603af0f R14: 00007f98b455e9c0 R15: 0000000000000000 [ 45.703160] [ 45.704961] ============================= [ 45.715241] WARNING: suspicious RCU usage [ 45.720628] 4.13.0-rc6+ #47 Not tainted [ 45.725045] ----------------------------- [ 45.734703] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! executing program [ 45.762070] [ 45.762070] other info that might help us debug this: [ 45.762070] [ 45.771504] [ 45.771504] rcu_scheduler_active = 2, debug_locks = 1 [ 45.781954] no locks held by syzkaller540614/6424. [ 45.788167] [ 45.788167] stack backtrace: [ 45.796270] CPU: 1 PID: 6424 Comm: syzkaller540614 Not tainted 4.13.0-rc6+ #47 [ 45.803627] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.812963] Call Trace: [ 45.815539] dump_stack+0x194/0x257 [ 45.819158] ? arch_local_irq_restore+0x53/0x53 [ 45.823839] lockdep_rcu_suspicious+0x123/0x170 [ 45.828522] kvm_dev_ioctl+0xd21/0x1840 [ 45.832485] ? lock_downgrade+0x990/0x990 [ 45.836641] ? install_new_memslots+0x420/0x420 [ 45.841325] ? avc_has_extended_perms+0x7fa/0x12c0 [ 45.846241] ? find_held_lock+0x35/0x1d0 [ 45.850308] ? avc_ss_reset+0x110/0x110 [ 45.854270] ? lock_downgrade+0x990/0x990 [ 45.858413] ? lock_release+0xa40/0xa40 executing program [ 45.862385] ? __lock_is_held+0xb6/0x140 [ 45.866478] ? check_same_owner+0x320/0x320 [ 45.870804] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 45.875911] ? install_new_memslots+0x420/0x420 [ 45.880571] do_vfs_ioctl+0x1b1/0x1520 [ 45.884457] ? ioctl_preallocate+0x2b0/0x2b0 [ 45.888884] ? selinux_capable+0x40/0x40 [ 45.892956] ? syscall_return_slowpath+0x22f/0x450 [ 45.897887] ? security_file_ioctl+0x7d/0xb0 [ 45.902281] ? security_file_ioctl+0x89/0xb0 [ 45.906689] SyS_ioctl+0x8f/0xc0 executing program executing program executing program executing program executing program executing program executing program [ 45.910055] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 45.914800] RIP: 0033:0x446369 [ 45.917977] RSP: 002b:00007f98b455ddc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 45.925674] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446369 [ 45.932933] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 [ 45.940190] RBP: 0000000000000086 R08: 00007f98b455e700 R09: 00007f98b455e700 [ 45.947445] R10: 00007f98b455e700 R11: 0000000000000246 R12: 0000000000000000 [ 45.954704] R13: 00007fff6603af0f R14: 00007f98b455e9c0 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