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-6,10.128.15.192' (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 syzkaller login: [ 35.303247] [ 35.304329] ============================= [ 35.304946] WARNING: suspicious RCU usage [ 35.306478] 4.13.0-rc5+ #40 Not tainted [ 35.307909] ----------------------------- [ 35.309265] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 35.310988] [ 35.310988] other info that might help us debug this: [ 35.310988] [ 35.313735] [ 35.313735] rcu_scheduler_active = 2, debug_locks = 1 [ 35.315229] no locks held by syzkaller816624/4238. [ 35.316773] [ 35.316773] stack backtrace: [ 35.317712] CPU: 0 PID: 4238 Comm: syzkaller816624 Not tainted 4.13.0-rc5+ #40 [ 35.318682] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.319901] Call Trace: [ 35.320260] dump_stack+0x194/0x257 [ 35.320753] ? arch_local_irq_restore+0x53/0x53 [ 35.321389] lockdep_rcu_suspicious+0x123/0x170 [ 35.322014] kvm_dev_ioctl+0x877/0x1840 [ 35.322546] ? lock_downgrade+0x990/0x990 [ 35.323111] ? install_new_memslots+0x420/0x420 [ 35.323748] ? avc_has_extended_perms+0x7fa/0x12c0 [ 35.328643] ? find_held_lock+0x35/0x1d0 [ 35.332680] ? avc_ss_reset+0x110/0x110 [ 35.336620] ? lock_downgrade+0x990/0x990 [ 35.340738] ? lock_release+0xa40/0xa40 [ 35.344682] ? __lock_is_held+0xb6/0x140 [ 35.348734] ? check_same_owner+0x320/0x320 [ 35.353033] ? install_new_memslots+0x420/0x420 [ 35.357673] do_vfs_ioctl+0x1b1/0x1520 [ 35.361535] ? ioctl_preallocate+0x2b0/0x2b0 [ 35.365912] ? selinux_capable+0x40/0x40 [ 35.369952] ? lock_release+0x111/0xa40 [ 35.373913] ? syscall_return_slowpath+0x22f/0x450 [ 35.378821] ? security_file_ioctl+0x7d/0xb0 [ 35.383197] ? security_file_ioctl+0x89/0xb0 [ 35.387579] SyS_ioctl+0x8f/0xc0 [ 35.390919] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 35.395644] RIP: 0033:0x446209 [ 35.398802] RSP: 002b:00007f89adf48dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 35.406476] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 35.413712] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 35.420951] RBP: 0000000000000086 R08: 00007f89adf49700 R09: 00007f89adf49700 [ 35.428189] R10: 00007f89adf49700 R11: 0000000000000246 R12: 0000000000000000 [ 35.435424] R13: 00007ffd992c79cf R14: 00007f89adf499c0 R15: 0000000000000000 [ 35.442888] [ 35.444547] ============================= [ 35.449048] WARNING: suspicious RCU usage executing program executing program executing program executing program executing program executing program [ 35.453506] 4.13.0-rc5+ #40 Not tainted [ 35.457910] ----------------------------- [ 35.462358] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 35.476666] [ 35.476666] other info that might help us debug this: [ 35.476666] [ 35.487903] [ 35.487903] rcu_scheduler_active = 2, debug_locks = 1 [ 35.500840] no locks held by syzkaller816624/4238. [ 35.517094] [ 35.517094] stack backtrace: [ 35.521981] CPU: 0 PID: 4238 Comm: syzkaller816624 Not tainted 4.13.0-rc5+ #40 [ 35.529329] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.538664] Call Trace: [ 35.541238] dump_stack+0x194/0x257 [ 35.544859] ? arch_local_irq_restore+0x53/0x53 [ 35.549532] lockdep_rcu_suspicious+0x123/0x170 executing program executing program executing program [ 35.554198] kvm_dev_ioctl+0xd21/0x1840 [ 35.558158] ? lock_downgrade+0x990/0x990 [ 35.562303] ? install_new_memslots+0x420/0x420 [ 35.566973] ? avc_has_extended_perms+0x7fa/0x12c0 [ 35.571883] ? find_held_lock+0x35/0x1d0 [ 35.575945] ? avc_ss_reset+0x110/0x110 [ 35.579901] ? lock_downgrade+0x990/0x990 [ 35.584040] ? lock_release+0xa40/0xa40 [ 35.588003] ? __lock_is_held+0xb6/0x140 [ 35.592090] ? check_same_owner+0x320/0x320 [ 35.596420] ? install_new_memslots+0x420/0x420 executing program [ 35.601074] do_vfs_ioctl+0x1b1/0x1520 [ 35.604956] ? ioctl_preallocate+0x2b0/0x2b0 [ 35.609354] ? selinux_capable+0x40/0x40 [ 35.613393] ? lock_release+0x111/0xa40 [ 35.617357] ? syscall_return_slowpath+0x22f/0x450 [ 35.622286] ? security_file_ioctl+0x7d/0xb0 [ 35.626676] ? security_file_ioctl+0x89/0xb0 [ 35.631084] SyS_ioctl+0x8f/0xc0 [ 35.634444] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 35.639180] RIP: 0033:0x446209 [ 35.642346] RSP: 002b:00007f89adf48dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 35.650030] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 35.657273] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 35.664512] RBP: 0000000000000086 R08: 00007f89adf49700 R09: 00007f89adf49700 [ 35.671750] R10: 00007f89adf49700 R11: 0000000000000246 R12: 0000000000000000 [ 35.678994] R13: 00007ffd992c79cf R14: 00007f89adf499c0 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 executing program executing program executing program