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-0,10.128.0.17' (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 syzkaller login: [ 43.888296] [ 43.888668] ============================= [ 43.889534] WARNING: suspicious RCU usage [ 43.890717] 4.13.0-rc5+ #41 Not tainted [ 43.891606] ----------------------------- [ 43.892396] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 43.893708] [ 43.893708] other info that might help us debug this: [ 43.893708] [ 43.895052] [ 43.895052] rcu_scheduler_active = 2, debug_locks = 1 [ 43.895946] no locks held by syzkaller313861/4777. [ 43.897553] [ 43.897553] stack backtrace: [ 43.898859] CPU: 1 PID: 4777 Comm: syzkaller313861 Not tainted 4.13.0-rc5+ #41 [ 43.899845] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.901165] Call Trace: [ 43.901533] dump_stack+0x194/0x257 [ 43.902038] ? arch_local_irq_restore+0x53/0x53 [ 43.902723] lockdep_rcu_suspicious+0x123/0x170 [ 43.903426] kvm_dev_ioctl+0x877/0x1840 [ 43.904007] ? lock_downgrade+0x990/0x990 [ 43.904655] ? install_new_memslots+0x420/0x420 [ 43.905326] ? avc_has_extended_perms+0x7fa/0x12c0 [ 43.906022] ? find_held_lock+0x35/0x1d0 [ 43.906642] ? avc_ss_reset+0x110/0x110 [ 43.907207] ? lock_downgrade+0x990/0x990 [ 43.907914] ? lock_release+0xa40/0xa40 [ 43.909305] ? __lock_is_held+0xb6/0x140 [ 43.913395] ? check_same_owner+0x320/0x320 [ 43.917707] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 43.922797] ? install_new_memslots+0x420/0x420 [ 43.927447] do_vfs_ioctl+0x1b1/0x1520 [ 43.931334] ? ioctl_preallocate+0x2b0/0x2b0 executing program [ 43.935813] ? selinux_capable+0x40/0x40 [ 43.939871] ? syscall_return_slowpath+0x22f/0x450 [ 43.944790] ? security_file_ioctl+0x7d/0xb0 [ 43.949175] ? security_file_ioctl+0x89/0xb0 [ 43.953568] SyS_ioctl+0x8f/0xc0 [ 43.956913] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 43.961641] RIP: 0033:0x446279 [ 43.964805] RSP: 002b:00007f61a34dadc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 43.972507] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446279 [ 43.979759] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 executing program executing program executing program executing program executing program executing program [ 43.987012] RBP: 0000000000000086 R08: 00007f61a34db700 R09: 00007f61a34db700 [ 43.994276] R10: 00007f61a34db700 R11: 0000000000000202 R12: 0000000000000000 [ 44.001528] R13: 00007fff3979b83f R14: 00007f61a34db9c0 R15: 0000000000000000 [ 44.008960] [ 44.011241] ============================= [ 44.015973] WARNING: suspicious RCU usage [ 44.020228] 4.13.0-rc5+ #41 Not tainted [ 44.024489] ----------------------------- [ 44.029901] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! executing program [ 44.044611] [ 44.044611] other info that might help us debug this: [ 44.044611] [ 44.058072] [ 44.058072] rcu_scheduler_active = 2, debug_locks = 1 [ 44.073487] no locks held by syzkaller313861/4777. [ 44.083892] [ 44.083892] stack backtrace: executing program executing program executing program [ 44.093526] CPU: 1 PID: 4777 Comm: syzkaller313861 Not tainted 4.13.0-rc5+ #41 [ 44.100893] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.110234] Call Trace: [ 44.112811] dump_stack+0x194/0x257 [ 44.116433] ? arch_local_irq_restore+0x53/0x53 [ 44.121108] lockdep_rcu_suspicious+0x123/0x170 [ 44.125772] kvm_dev_ioctl+0xd21/0x1840 [ 44.129734] ? lock_downgrade+0x990/0x990 [ 44.133886] ? install_new_memslots+0x420/0x420 [ 44.138566] ? avc_has_extended_perms+0x7fa/0x12c0 executing program executing program executing program [ 44.143481] ? find_held_lock+0x35/0x1d0 [ 44.147550] ? avc_ss_reset+0x110/0x110 [ 44.151510] ? lock_downgrade+0x990/0x990 [ 44.155652] ? lock_release+0xa40/0xa40 [ 44.159620] ? __lock_is_held+0xb6/0x140 [ 44.163711] ? check_same_owner+0x320/0x320 [ 44.168025] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 44.173133] ? install_new_memslots+0x420/0x420 [ 44.177798] do_vfs_ioctl+0x1b1/0x1520 [ 44.181666] ? ioctl_preallocate+0x2b0/0x2b0 [ 44.186059] ? selinux_capable+0x40/0x40 [ 44.190119] ? syscall_return_slowpath+0x22f/0x450 executing program executing program [ 44.195048] ? security_file_ioctl+0x7d/0xb0 [ 44.199447] ? security_file_ioctl+0x89/0xb0 [ 44.203851] SyS_ioctl+0x8f/0xc0 [ 44.207216] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 44.211955] RIP: 0033:0x446279 [ 44.215134] RSP: 002b:00007f61a34dadc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 44.222833] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446279 [ 44.230088] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 44.237346] RBP: 0000000000000086 R08: 00007f61a34db700 R09: 00007f61a34db700 executing program executing program executing program executing program executing program executing program executing program [ 44.244606] R10: 00007f61a34db700 R11: 0000000000000202 R12: 0000000000000000 [ 44.251860] R13: 00007fff3979b83f R14: 00007f61a34db9c0 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