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-5,10.128.0.31' (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: [ 59.894325] kvm: KVM_SET_TSS_ADDR need to be called before entering vcpu executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 63.984342] [ 63.988548] ============================= [ 63.993371] WARNING: suspicious RCU usage [ 64.011331] 4.13.0-rc5+ #43 Not tainted [ 64.028340] ----------------------------- executing program executing program executing program [ 64.033367] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 64.072608] [ 64.072608] other info that might help us debug this: [ 64.072608] executing program executing program executing program [ 64.084105] [ 64.084105] rcu_scheduler_active = 2, debug_locks = 1 [ 64.097482] no locks held by syzkaller321955/6184. [ 64.114233] [ 64.114233] stack backtrace: [ 64.129797] CPU: 1 PID: 6184 Comm: syzkaller321955 Not tainted 4.13.0-rc5+ #43 [ 64.137188] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.146530] Call Trace: [ 64.149106] dump_stack+0x194/0x257 [ 64.152731] ? arch_local_irq_restore+0x53/0x53 [ 64.157414] lockdep_rcu_suspicious+0x123/0x170 [ 64.162086] kvm_dev_ioctl+0x877/0x1840 [ 64.166050] ? lock_downgrade+0x990/0x990 [ 64.170208] ? install_new_memslots+0x420/0x420 [ 64.174902] ? avc_has_extended_perms+0x7fa/0x12c0 [ 64.180265] ? find_held_lock+0x35/0x1d0 [ 64.184347] ? avc_ss_reset+0x110/0x110 [ 64.188321] ? lock_downgrade+0x990/0x990 [ 64.192469] ? lock_release+0xa40/0xa40 [ 64.196444] ? __lock_is_held+0xb6/0x140 [ 64.200541] ? check_same_owner+0x320/0x320 [ 64.204880] ? install_new_memslots+0x420/0x420 [ 64.209546] do_vfs_ioctl+0x1b1/0x1520 [ 64.213437] ? ioctl_preallocate+0x2b0/0x2b0 [ 64.217841] ? selinux_capable+0x40/0x40 [ 64.221894] ? lock_downgrade+0x811/0x990 [ 64.226044] ? syscall_return_slowpath+0x22f/0x450 [ 64.230982] ? security_file_ioctl+0x7d/0xb0 executing program executing program [ 64.235383] ? security_file_ioctl+0x89/0xb0 [ 64.239790] SyS_ioctl+0x8f/0xc0 [ 64.243158] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 64.247900] RIP: 0033:0x446249 [ 64.251074] RSP: 002b:00007f4554a6cdc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 64.258771] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446249 [ 64.266027] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 64.273286] RBP: 0000000000000086 R08: 00007f4554a6d700 R09: 00007f4554a6d700 executing program executing program executing program executing program executing program executing program [ 64.280540] R10: 00007f4554a6d700 R11: 0000000000000246 R12: 0000000000000000 [ 64.287800] R13: 00007ffd61e97faf R14: 00007f4554a6d9c0 R15: 0000000000000000 [ 64.295302] executing program [ 64.332615] ============================= [ 64.344044] WARNING: suspicious RCU usage [ 64.358931] 4.13.0-rc5+ #43 Not tainted [ 64.370373] ----------------------------- executing program executing program executing program executing program executing program executing program [ 64.376416] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 64.385586] [ 64.385586] other info that might help us debug this: [ 64.385586] [ 64.403906] [ 64.403906] rcu_scheduler_active = 2, debug_locks = 1 executing program executing program executing program [ 64.434858] no locks held by syzkaller321955/6184. [ 64.441606] [ 64.441606] stack backtrace: [ 64.466545] CPU: 1 PID: 6184 Comm: syzkaller321955 Not tainted 4.13.0-rc5+ #43 [ 64.473940] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.483296] Call Trace: [ 64.485873] dump_stack+0x194/0x257 [ 64.489512] ? arch_local_irq_restore+0x53/0x53 [ 64.494222] lockdep_rcu_suspicious+0x123/0x170 [ 64.498895] kvm_dev_ioctl+0xd21/0x1840 [ 64.502857] ? lock_downgrade+0x990/0x990 [ 64.507007] ? install_new_memslots+0x420/0x420 [ 64.511692] ? avc_has_extended_perms+0x7fa/0x12c0 [ 64.516609] ? find_held_lock+0x35/0x1d0 [ 64.520679] ? avc_ss_reset+0x110/0x110 [ 64.524641] ? lock_downgrade+0x990/0x990 [ 64.528781] ? lock_release+0xa40/0xa40 [ 64.532754] ? __lock_is_held+0xb6/0x140 [ 64.536851] ? check_same_owner+0x320/0x320 [ 64.541183] ? install_new_memslots+0x420/0x420 [ 64.545849] do_vfs_ioctl+0x1b1/0x1520 [ 64.549734] ? ioctl_preallocate+0x2b0/0x2b0 [ 64.554142] ? selinux_capable+0x40/0x40 [ 64.558197] ? lock_downgrade+0x811/0x990 [ 64.562346] ? syscall_return_slowpath+0x22f/0x450 [ 64.567281] ? security_file_ioctl+0x7d/0xb0 [ 64.571677] ? security_file_ioctl+0x89/0xb0 [ 64.576087] SyS_ioctl+0x8f/0xc0 [ 64.579461] entry_SYSCALL_64_fastpath+0x1f/0xbe executing program executing program executing program executing program executing program executing program [ 64.584204] RIP: 0033:0x446249 [ 64.587380] RSP: 002b:00007f4554a6cdc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 64.595077] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446249 [ 64.602334] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 64.609591] RBP: 0000000000000086 R08: 00007f4554a6d700 R09: 00007f4554a6d700 [ 64.616849] R10: 00007f4554a6d700 R11: 0000000000000246 R12: 0000000000000000 [ 64.624104] R13: 00007ffd61e97faf R14: 00007f4554a6d9c0 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