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-0,10.128.0.63' (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 syzkaller login: [ 43.924307] [ 43.924686] ============================= [ 43.927371] WARNING: suspicious RCU usage [ 43.928057] 4.13.0-mm1+ #7 Not tainted [ 43.929712] ----------------------------- [ 43.930982] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 43.937552] [ 43.937552] other info that might help us debug this: [ 43.937552] [ 43.941451] [ 43.941451] rcu_scheduler_active = 2, debug_locks = 1 [ 43.946581] no locks held by syzkaller107930/4774. [ 43.970500] executing program [ 43.970500] stack backtrace: [ 43.980684] CPU: 0 PID: 4774 Comm: syzkaller107930 Not tainted 4.13.0-mm1+ #7 [ 43.987953] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.997289] Call Trace: [ 43.999874] dump_stack+0x194/0x257 [ 44.003506] ? arch_local_irq_restore+0x53/0x53 [ 44.008192] lockdep_rcu_suspicious+0x123/0x170 [ 44.012860] kvm_dev_ioctl+0x877/0x1840 [ 44.016844] ? install_new_memslots+0x420/0x420 executing program executing program [ 44.021531] ? avc_has_extended_perms+0x7fa/0x12c0 [ 44.026452] ? lock_downgrade+0x990/0x990 [ 44.030610] ? avc_ss_reset+0x110/0x110 [ 44.034587] ? lock_release+0xd70/0xd70 [ 44.038562] ? __lock_is_held+0xbc/0x140 [ 44.042663] ? check_same_owner+0x320/0x320 [ 44.046983] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 44.052095] ? install_new_memslots+0x420/0x420 [ 44.056757] do_vfs_ioctl+0x1b1/0x1530 [ 44.060651] ? ioctl_preallocate+0x2b0/0x2b0 [ 44.065056] ? selinux_capable+0x40/0x40 [ 44.069121] ? lockdep_invariant_state+0xdb/0x120 executing program [ 44.073962] ? syscall_return_slowpath+0x2b3/0x500 [ 44.078884] ? finish_task_switch+0x4c9/0x740 [ 44.083384] ? security_file_ioctl+0x7d/0xb0 [ 44.088201] ? security_file_ioctl+0x89/0xb0 [ 44.092596] SyS_ioctl+0x8f/0xc0 [ 44.095943] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 44.100669] RIP: 0033:0x4462b9 [ 44.103831] RSP: 002b:00007f49daa6cdc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 44.111520] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004462b9 executing program executing program executing program [ 44.118779] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 [ 44.126036] RBP: 0000000000000082 R08: 00007f49daa6d700 R09: 00007f49daa6d700 [ 44.133295] R10: 00007f49daa6d700 R11: 0000000000000202 R12: 0000000000000000 [ 44.140552] R13: 00007fff69ea71ff R14: 00007f49daa6d9c0 R15: 0000000000000000 [ 44.148132] [ 44.152281] ============================= [ 44.157489] WARNING: suspicious RCU usage [ 44.162176] 4.13.0-mm1+ #7 Not tainted [ 44.171218] ----------------------------- executing program executing program executing program executing program [ 44.180301] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 44.197482] [ 44.197482] other info that might help us debug this: [ 44.197482] [ 44.207317] [ 44.207317] rcu_scheduler_active = 2, debug_locks = 1 [ 44.219913] no locks held by syzkaller107930/4774. executing program executing program [ 44.241107] [ 44.241107] stack backtrace: [ 44.247266] CPU: 0 PID: 4774 Comm: syzkaller107930 Not tainted 4.13.0-mm1+ #7 [ 44.254536] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.263878] Call Trace: [ 44.266461] dump_stack+0x194/0x257 [ 44.270090] ? arch_local_irq_restore+0x53/0x53 [ 44.274782] lockdep_rcu_suspicious+0x123/0x170 [ 44.279449] kvm_dev_ioctl+0xd21/0x1840 [ 44.283431] ? install_new_memslots+0x420/0x420 executing program [ 44.288128] ? avc_has_extended_perms+0x7fa/0x12c0 [ 44.293049] ? lock_downgrade+0x990/0x990 [ 44.297206] ? avc_ss_reset+0x110/0x110 [ 44.301184] ? lock_release+0xd70/0xd70 [ 44.305164] ? __lock_is_held+0xbc/0x140 [ 44.309269] ? check_same_owner+0x320/0x320 [ 44.313589] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 44.318702] ? install_new_memslots+0x420/0x420 [ 44.323360] do_vfs_ioctl+0x1b1/0x1530 [ 44.327249] ? ioctl_preallocate+0x2b0/0x2b0 [ 44.331658] ? selinux_capable+0x40/0x40 [ 44.335709] ? lockdep_invariant_state+0xdb/0x120 [ 44.340529] ? syscall_return_slowpath+0x2b3/0x500 [ 44.345457] ? finish_task_switch+0x4c9/0x740 [ 44.349945] ? security_file_ioctl+0x7d/0xb0 [ 44.354326] ? security_file_ioctl+0x89/0xb0 [ 44.358724] SyS_ioctl+0x8f/0xc0 [ 44.362092] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 44.366832] RIP: 0033:0x4462b9 [ 44.369995] RSP: 002b:00007f49daa6cdc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 44.377691] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004462b9 executing program executing program executing program [ 44.384942] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 [ 44.392202] RBP: 0000000000000082 R08: 00007f49daa6d700 R09: 00007f49daa6d700 [ 44.399459] R10: 00007f49daa6d700 R11: 0000000000000202 R12: 0000000000000000 [ 44.406713] R13: 00007fff69ea71ff R14: 00007f49daa6d9c0 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