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-8,10.128.0.2' (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 syzkaller login: [ 44.477993] [ 44.482071] ============================= executing program executing program executing program executing program executing program executing program [ 44.541727] WARNING: suspicious RCU usage [ 44.552399] 4.13.0+ #74 Not tainted [ 44.556791] ----------------------------- [ 44.565747] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! executing program [ 44.604283] [ 44.604283] other info that might help us debug this: [ 44.604283] [ 44.632647] [ 44.632647] rcu_scheduler_active = 2, debug_locks = 1 [ 44.646075] no locks held by syzkaller528277/6240. [ 44.658571] [ 44.658571] stack backtrace: [ 44.663684] CPU: 0 PID: 6240 Comm: syzkaller528277 Not tainted 4.13.0+ #74 [ 44.670693] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.680039] Call Trace: [ 44.682628] dump_stack+0x194/0x257 [ 44.686263] ? arch_local_irq_restore+0x53/0x53 [ 44.690952] lockdep_rcu_suspicious+0x123/0x170 [ 44.695645] kvm_dev_ioctl+0x877/0x1840 [ 44.699660] ? install_new_memslots+0x420/0x420 [ 44.704373] ? avc_has_extended_perms+0x7fa/0x12c0 [ 44.709303] ? lock_downgrade+0x990/0x990 [ 44.713464] ? avc_ss_reset+0x110/0x110 [ 44.717441] ? lock_release+0xd70/0xd70 [ 44.721459] ? __lock_is_held+0xbc/0x140 [ 44.725593] ? check_same_owner+0x320/0x320 [ 44.729927] ? rcu_pm_notify+0xc0/0xc0 [ 44.733836] ? install_new_memslots+0x420/0x420 [ 44.738504] do_vfs_ioctl+0x1b1/0x1530 [ 44.742398] ? ioctl_preallocate+0x2b0/0x2b0 [ 44.746808] ? selinux_capable+0x40/0x40 [ 44.750880] ? __lock_acquire+0x4231/0x4620 [ 44.755248] ? lockdep_invariant_state+0xbb/0x120 [ 44.760101] ? syscall_return_slowpath+0x2b3/0x500 [ 44.765025] ? finish_task_switch+0x1aa/0x740 [ 44.769545] ? security_file_ioctl+0x7d/0xb0 [ 44.773949] ? security_file_ioctl+0x89/0xb0 [ 44.778359] SyS_ioctl+0x8f/0xc0 [ 44.781732] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 44.786483] RIP: 0033:0x44a0e9 [ 44.789670] RSP: 002b:00007fa7fb828dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 44.797382] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044a0e9 [ 44.804643] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 [ 44.811904] RBP: 0000000000000082 R08: 00007fa7fb829700 R09: 00007fa7fb829700 [ 44.819168] R10: 00007fa7fb829700 R11: 0000000000000202 R12: 0000000000000000 [ 44.826432] R13: 00007ffd6a7dcf5f R14: 00007fa7fb8299c0 R15: 0000000000000000 [ 44.833933] [ 44.837867] ============================= [ 44.842362] WARNING: suspicious RCU usage [ 44.851578] 4.13.0+ #74 Not tainted executing program executing program executing program executing program executing program executing program [ 44.856470] ----------------------------- [ 44.862872] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 44.876143] [ 44.876143] other info that might help us debug this: [ 44.876143] [ 44.886418] [ 44.886418] rcu_scheduler_active = 2, debug_locks = 1 [ 44.902997] no locks held by syzkaller528277/6240. executing program [ 44.924559] [ 44.924559] stack backtrace: [ 44.942390] CPU: 0 PID: 6240 Comm: syzkaller528277 Not tainted 4.13.0+ #74 [ 44.949405] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.958750] Call Trace: [ 44.961340] dump_stack+0x194/0x257 [ 44.964982] ? arch_local_irq_restore+0x53/0x53 [ 44.969670] lockdep_rcu_suspicious+0x123/0x170 [ 44.974357] kvm_dev_ioctl+0xd21/0x1840 [ 44.978344] ? install_new_memslots+0x420/0x420 [ 44.983039] ? avc_has_extended_perms+0x7fa/0x12c0 [ 44.987965] ? lock_downgrade+0x990/0x990 [ 44.992126] ? avc_ss_reset+0x110/0x110 [ 44.996109] ? lock_release+0xd70/0xd70 [ 45.000085] ? __lock_is_held+0xbc/0x140 [ 45.004188] ? check_same_owner+0x320/0x320 [ 45.008503] ? rcu_pm_notify+0xc0/0xc0 [ 45.012414] ? install_new_memslots+0x420/0x420 [ 45.017085] do_vfs_ioctl+0x1b1/0x1530 [ 45.020980] ? ioctl_preallocate+0x2b0/0x2b0 [ 45.025397] ? selinux_capable+0x40/0x40 [ 45.029452] ? __lock_acquire+0x4231/0x4620 [ 45.033791] ? lockdep_invariant_state+0xbb/0x120 [ 45.038633] ? syscall_return_slowpath+0x2b3/0x500 [ 45.043557] ? finish_task_switch+0x1aa/0x740 [ 45.048075] ? security_file_ioctl+0x7d/0xb0 [ 45.052478] ? security_file_ioctl+0x89/0xb0 [ 45.056897] SyS_ioctl+0x8f/0xc0 [ 45.060271] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 45.065021] RIP: 0033:0x44a0e9 executing program executing program executing program executing program executing program [ 45.068202] RSP: 002b:00007fa7fb828dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 45.075916] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044a0e9 [ 45.083183] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 [ 45.090444] RBP: 0000000000000082 R08: 00007fa7fb829700 R09: 00007fa7fb829700 [ 45.097708] R10: 00007fa7fb829700 R11: 0000000000000202 R12: 0000000000000000 [ 45.104970] R13: 00007ffd6a7dcf5f R14: 00007fa7fb8299c0 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