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-5,10.128.15.204' (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 syzkaller login: [ 49.455569] [ 49.458076] ============================= [ 49.486273] WARNING: suspicious RCU usage [ 49.495596] 4.13.0+ #73 Not tainted [ 49.500524] ----------------------------- executing program executing program executing program [ 49.505183] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 49.514834] [ 49.514834] other info that might help us debug this: [ 49.514834] [ 49.526160] [ 49.526160] rcu_scheduler_active = 2, debug_locks = 1 [ 49.544121] no locks held by syzkaller628369/3448. executing program executing program executing program [ 49.562938] [ 49.562938] stack backtrace: [ 49.572785] CPU: 1 PID: 3448 Comm: syzkaller628369 Not tainted 4.13.0+ #73 [ 49.579796] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.589121] Call Trace: [ 49.591683] dump_stack+0x194/0x257 [ 49.595285] ? arch_local_irq_restore+0x53/0x53 [ 49.599940] lockdep_rcu_suspicious+0x123/0x170 [ 49.604590] kvm_dev_ioctl+0x877/0x1840 [ 49.608546] ? install_new_memslots+0x420/0x420 [ 49.613205] ? avc_has_extended_perms+0x7fa/0x12c0 [ 49.618108] ? lock_downgrade+0x990/0x990 [ 49.622238] ? avc_ss_reset+0x110/0x110 [ 49.626190] ? lock_release+0xd70/0xd70 [ 49.630143] ? __lock_is_held+0xbc/0x140 [ 49.634204] ? check_same_owner+0x320/0x320 [ 49.638497] ? rcu_pm_notify+0xc0/0xc0 [ 49.642370] ? install_new_memslots+0x420/0x420 [ 49.647024] do_vfs_ioctl+0x1b1/0x1530 [ 49.650890] ? ioctl_preallocate+0x2b0/0x2b0 [ 49.655275] ? selinux_capable+0x40/0x40 [ 49.659310] ? __lock_acquire+0x4231/0x4620 executing program [ 49.663609] ? lockdep_invariant_state+0xbb/0x120 [ 49.668428] ? syscall_return_slowpath+0x2b3/0x500 [ 49.673330] ? finish_task_switch+0x1aa/0x740 [ 49.677812] ? security_file_ioctl+0x7d/0xb0 [ 49.682201] ? security_file_ioctl+0x89/0xb0 [ 49.686589] SyS_ioctl+0x8f/0xc0 [ 49.689936] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 49.694671] RIP: 0033:0x4490c9 [ 49.697836] RSP: 002b:00007f6a236c7dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 49.705521] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004490c9 executing program executing program executing program [ 49.712764] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000005 [ 49.720010] RBP: 0000000000000082 R08: 00007f6a236c8700 R09: 00007f6a236c8700 [ 49.727254] R10: 00007f6a236c8700 R11: 0000000000000202 R12: 0000000000000000 [ 49.734497] R13: 00007ffe3e38471f R14: 00007f6a236c89c0 R15: 0000000000000000 [ 49.741967] [ 49.746920] ============================= [ 49.757401] WARNING: suspicious RCU usage [ 49.771409] 4.13.0+ #73 Not tainted [ 49.788073] ----------------------------- [ 49.802392] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! executing program executing program executing program executing program executing program [ 49.821384] [ 49.821384] other info that might help us debug this: [ 49.821384] [ 49.830192] [ 49.830192] rcu_scheduler_active = 2, debug_locks = 1 [ 49.840552] no locks held by syzkaller628369/3448. [ 49.848641] [ 49.848641] stack backtrace: [ 49.854504] CPU: 1 PID: 3448 Comm: syzkaller628369 Not tainted 4.13.0+ #73 [ 49.861500] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 executing program [ 49.870837] Call Trace: [ 49.873400] dump_stack+0x194/0x257 [ 49.877004] ? arch_local_irq_restore+0x53/0x53 [ 49.881666] lockdep_rcu_suspicious+0x123/0x170 [ 49.886311] kvm_dev_ioctl+0xd21/0x1840 [ 49.890266] ? install_new_memslots+0x420/0x420 [ 49.894925] ? avc_has_extended_perms+0x7fa/0x12c0 [ 49.899827] ? lock_downgrade+0x990/0x990 [ 49.903958] ? avc_ss_reset+0x110/0x110 [ 49.907908] ? lock_release+0xd70/0xd70 [ 49.911858] ? __lock_is_held+0xbc/0x140 [ 49.915917] ? check_same_owner+0x320/0x320 [ 49.920219] ? rcu_pm_notify+0xc0/0xc0 [ 49.924094] ? install_new_memslots+0x420/0x420 [ 49.928740] do_vfs_ioctl+0x1b1/0x1530 [ 49.932617] ? ioctl_preallocate+0x2b0/0x2b0 [ 49.937000] ? selinux_capable+0x40/0x40 [ 49.941046] ? __lock_acquire+0x4231/0x4620 [ 49.945344] ? lockdep_invariant_state+0xbb/0x120 [ 49.950156] ? syscall_return_slowpath+0x2b3/0x500 [ 49.955056] ? finish_task_switch+0x1aa/0x740 [ 49.959534] ? security_file_ioctl+0x7d/0xb0 [ 49.963918] ? security_file_ioctl+0x89/0xb0 [ 49.968302] SyS_ioctl+0x8f/0xc0 executing program [ 49.971646] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 49.976373] RIP: 0033:0x4490c9 [ 49.979535] RSP: 002b:00007f6a236c7dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 49.987215] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004490c9 [ 49.994458] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000005 [ 50.001701] RBP: 0000000000000082 R08: 00007f6a236c8700 R09: 00007f6a236c8700 [ 50.008944] R10: 00007f6a236c8700 R11: 0000000000000202 R12: 0000000000000000 executing program executing program [ 50.016184] R13: 00007ffe3e38471f R14: 00007f6a236c89c0 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