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-8,10.128.15.196' (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 syzkaller login: [ 43.340886] [ 43.343327] ============================= [ 43.348615] WARNING: suspicious RCU usage [ 43.353169] 4.13.0-mm1+ #7 Not tainted [ 43.361275] ----------------------------- [ 43.365525] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 43.379505] [ 43.379505] other info that might help us debug this: [ 43.379505] [ 43.390565] [ 43.390565] rcu_scheduler_active = 2, debug_locks = 1 [ 43.400702] no locks held by syzkaller458115/3193. [ 43.407318] [ 43.407318] stack backtrace: [ 43.414184] CPU: 1 PID: 3193 Comm: syzkaller458115 Not tainted 4.13.0-mm1+ #7 [ 43.421464] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.430796] Call Trace: [ 43.433369] dump_stack+0x194/0x257 [ 43.436975] ? arch_local_irq_restore+0x53/0x53 [ 43.441632] lockdep_rcu_suspicious+0x123/0x170 [ 43.446283] kvm_dev_ioctl+0x877/0x1840 [ 43.450240] ? install_new_memslots+0x420/0x420 [ 43.454901] ? avc_has_extended_perms+0x7fa/0x12c0 [ 43.459818] ? lock_downgrade+0x990/0x990 [ 43.463954] ? avc_ss_reset+0x110/0x110 [ 43.467908] ? lock_release+0xd70/0xd70 [ 43.471857] ? __lock_is_held+0xbc/0x140 [ 43.475931] ? check_same_owner+0x320/0x320 [ 43.480224] ? rcu_pm_notify+0xc0/0xc0 [ 43.484099] ? install_new_memslots+0x420/0x420 [ 43.488746] do_vfs_ioctl+0x1b1/0x1530 [ 43.492614] ? ioctl_preallocate+0x2b0/0x2b0 [ 43.497012] ? selinux_capable+0x40/0x40 [ 43.501068] ? __lock_acquire+0x1651/0x4620 [ 43.505371] ? lockdep_invariant_state+0xdb/0x120 [ 43.510188] ? syscall_return_slowpath+0x2b3/0x500 [ 43.515092] ? finish_task_switch+0x1aa/0x740 [ 43.519569] ? security_file_ioctl+0x7d/0xb0 [ 43.523948] ? security_file_ioctl+0x89/0xb0 [ 43.528336] SyS_ioctl+0x8f/0xc0 [ 43.531685] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 43.536424] RIP: 0033:0x446209 executing program executing program executing program executing program [ 43.539584] RSP: 002b:00007f25af7a4dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 43.547271] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 43.554516] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 43.561760] RBP: 0000000000000082 R08: 00007f25af7a5700 R09: 00007f25af7a5700 [ 43.569002] R10: 00007f25af7a5700 R11: 0000000000000246 R12: 0000000000000000 [ 43.576248] R13: 00007fffe17295af R14: 00007f25af7a59c0 R15: 0000000000000000 [ 43.583659] executing program executing program executing program executing program [ 43.597224] ============================= [ 43.602378] WARNING: suspicious RCU usage [ 43.611861] 4.13.0-mm1+ #7 Not tainted [ 43.616339] ----------------------------- [ 43.626763] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 43.642822] executing program executing program executing program [ 43.642822] other info that might help us debug this: [ 43.642822] [ 43.651785] [ 43.651785] rcu_scheduler_active = 2, debug_locks = 1 [ 43.659350] no locks held by syzkaller458115/3193. [ 43.665189] [ 43.665189] stack backtrace: [ 43.674468] CPU: 1 PID: 3193 Comm: syzkaller458115 Not tainted 4.13.0-mm1+ #7 [ 43.681732] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.691066] Call Trace: [ 43.693636] dump_stack+0x194/0x257 executing program [ 43.697239] ? arch_local_irq_restore+0x53/0x53 [ 43.701924] lockdep_rcu_suspicious+0x123/0x170 [ 43.706581] kvm_dev_ioctl+0xd21/0x1840 [ 43.710543] ? install_new_memslots+0x420/0x420 [ 43.715202] ? avc_has_extended_perms+0x7fa/0x12c0 [ 43.720105] ? lock_downgrade+0x990/0x990 [ 43.724240] ? avc_ss_reset+0x110/0x110 [ 43.728195] ? lock_release+0xd70/0xd70 [ 43.732146] ? __lock_is_held+0xbc/0x140 [ 43.736208] ? check_same_owner+0x320/0x320 [ 43.740504] ? rcu_pm_notify+0xc0/0xc0 executing program [ 43.744378] ? install_new_memslots+0x420/0x420 [ 43.749020] do_vfs_ioctl+0x1b1/0x1530 [ 43.752887] ? ioctl_preallocate+0x2b0/0x2b0 [ 43.757273] ? selinux_capable+0x40/0x40 [ 43.761308] ? __lock_acquire+0x1651/0x4620 [ 43.765603] ? lockdep_invariant_state+0xdb/0x120 [ 43.770421] ? syscall_return_slowpath+0x2b3/0x500 [ 43.775321] ? finish_task_switch+0x1aa/0x740 [ 43.779797] ? security_file_ioctl+0x7d/0xb0 [ 43.784176] ? security_file_ioctl+0x89/0xb0 [ 43.788562] SyS_ioctl+0x8f/0xc0 [ 43.791909] entry_SYSCALL_64_fastpath+0x1f/0xbe executing program executing program executing program executing program executing program [ 43.796635] RIP: 0033:0x446209 [ 43.799801] RSP: 002b:00007f25af7a4dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 43.807485] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 43.814730] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 43.821974] RBP: 0000000000000082 R08: 00007f25af7a5700 R09: 00007f25af7a5700 [ 43.829218] R10: 00007f25af7a5700 R11: 0000000000000246 R12: 0000000000000000 [ 43.836458] R13: 00007fffe17295af R14: 00007f25af7a59c0 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 executing program executing program executing program executing program executing program executing program