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-4,10.128.0.40' (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 syzkaller login: [ 47.650027] hrtimer: interrupt took 16657 ns executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 49.129763] [ 49.131608] ============================= [ 49.136695] WARNING: suspicious RCU usage [ 49.141805] 4.13.0-rc4+ #29 Not tainted [ 49.148335] ----------------------------- [ 49.160036] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 49.171217] [ 49.171217] other info that might help us debug this: [ 49.171217] executing program executing program [ 49.180219] [ 49.180219] rcu_scheduler_active = 2, debug_locks = 1 [ 49.195963] no locks held by syzkaller236578/4258. [ 49.205416] [ 49.205416] stack backtrace: [ 49.211301] CPU: 0 PID: 4258 Comm: syzkaller236578 Not tainted 4.13.0-rc4+ #29 [ 49.218640] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.227981] Call Trace: executing program [ 49.230548] dump_stack+0x194/0x257 [ 49.234149] ? arch_local_irq_restore+0x53/0x53 [ 49.238800] lockdep_rcu_suspicious+0x123/0x170 [ 49.243444] kvm_dev_ioctl+0x877/0x1840 [ 49.247382] ? lock_downgrade+0x990/0x990 [ 49.251513] ? install_new_memslots+0x420/0x420 [ 49.256168] ? avc_has_extended_perms+0x7fa/0x12c0 [ 49.261069] ? find_held_lock+0x35/0x1d0 [ 49.265106] ? avc_ss_reset+0x110/0x110 [ 49.269046] ? lock_downgrade+0x990/0x990 [ 49.273166] ? lock_release+0xa40/0xa40 executing program [ 49.277124] ? __lock_is_held+0xb6/0x140 [ 49.281180] ? check_same_owner+0x320/0x320 [ 49.285474] ? retint_kernel+0x10/0x10 [ 49.289331] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 49.294323] ? install_new_memslots+0x420/0x420 [ 49.298963] do_vfs_ioctl+0x1b1/0x1520 [ 49.302826] ? ioctl_preallocate+0x2b0/0x2b0 [ 49.307208] ? selinux_capable+0x40/0x40 [ 49.311240] ? _raw_spin_unlock_irq+0x56/0x70 [ 49.315710] ? syscall_return_slowpath+0x22f/0x450 [ 49.320618] ? security_file_ioctl+0x7d/0xb0 [ 49.324990] ? security_file_ioctl+0x89/0xb0 executing program [ 49.329370] SyS_ioctl+0x8f/0xc0 [ 49.332711] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 49.337434] RIP: 0033:0x446369 [ 49.340591] RSP: 002b:00007ff8c4c8ddc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 49.348283] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446369 [ 49.355522] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 [ 49.362762] RBP: 0000000000000086 R08: 00007ff8c4c8e700 R09: 00007ff8c4c8e700 [ 49.370009] R10: 00007ff8c4c8e700 R11: 0000000000000246 R12: 0000000000000000 executing program executing program executing program executing program executing program [ 49.377257] R13: 00007ffdd1aa0e3f R14: 00007ff8c4c8e9c0 R15: 0000000000000000 [ 49.384709] [ 49.386338] ============================= [ 49.393742] WARNING: suspicious RCU usage [ 49.399290] 4.13.0-rc4+ #29 Not tainted [ 49.403318] ----------------------------- [ 49.407815] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 49.415855] [ 49.415855] other info that might help us debug this: [ 49.415855] [ 49.424298] [ 49.424298] rcu_scheduler_active = 2, debug_locks = 1 executing program executing program [ 49.436226] no locks held by syzkaller236578/4258. [ 49.443974] [ 49.443974] stack backtrace: [ 49.454160] CPU: 0 PID: 4258 Comm: syzkaller236578 Not tainted 4.13.0-rc4+ #29 [ 49.461522] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.470860] Call Trace: [ 49.473422] dump_stack+0x194/0x257 [ 49.477020] ? arch_local_irq_restore+0x53/0x53 [ 49.481668] lockdep_rcu_suspicious+0x123/0x170 executing program executing program [ 49.486320] kvm_dev_ioctl+0xd21/0x1840 [ 49.490268] ? lock_downgrade+0x990/0x990 [ 49.494396] ? install_new_memslots+0x420/0x420 [ 49.499054] ? avc_has_extended_perms+0x7fa/0x12c0 [ 49.503962] ? find_held_lock+0x35/0x1d0 [ 49.508014] ? avc_ss_reset+0x110/0x110 [ 49.511963] ? lock_downgrade+0x990/0x990 [ 49.516084] ? lock_release+0xa40/0xa40 [ 49.520037] ? __lock_is_held+0xb6/0x140 [ 49.524097] ? check_same_owner+0x320/0x320 [ 49.528395] ? retint_kernel+0x10/0x10 executing program executing program executing program executing program executing program [ 49.532255] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 49.537247] ? install_new_memslots+0x420/0x420 [ 49.541895] do_vfs_ioctl+0x1b1/0x1520 [ 49.545758] ? ioctl_preallocate+0x2b0/0x2b0 [ 49.550139] ? selinux_capable+0x40/0x40 [ 49.554171] ? _raw_spin_unlock_irq+0x56/0x70 [ 49.558640] ? syscall_return_slowpath+0x22f/0x450 [ 49.563546] ? security_file_ioctl+0x7d/0xb0 [ 49.567920] ? security_file_ioctl+0x89/0xb0 [ 49.572300] SyS_ioctl+0x8f/0xc0 [ 49.575645] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 49.580369] RIP: 0033:0x446369 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 49.583527] RSP: 002b:00007ff8c4c8ddc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 49.591244] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446369 [ 49.598486] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 [ 49.605725] RBP: 0000000000000086 R08: 00007ff8c4c8e700 R09: 00007ff8c4c8e700 [ 49.612983] R10: 00007ff8c4c8e700 R11: 0000000000000246 R12: 0000000000000000 [ 49.620222] R13: 00007ffdd1aa0e3f R14: 00007ff8c4c8e9c0 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