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-2,10.128.0.54' (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 syzkaller login: [ 42.491042] [ 42.491502] ============================= [ 42.492645] WARNING: suspicious RCU usage [ 42.493292] 4.13.0-rc5+ #42 Not tainted [ 42.493903] ----------------------------- [ 42.494698] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 42.496066] [ 42.496066] other info that might help us debug this: [ 42.496066] [ 42.497425] [ 42.497425] rcu_scheduler_active = 2, debug_locks = 1 [ 42.498566] no locks held by syzkaller685971/4388. [ 42.502387] [ 42.502387] stack backtrace: [ 42.503392] CPU: 1 PID: 4388 Comm: syzkaller685971 Not tainted 4.13.0-rc5+ #42 [ 42.504432] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.505682] Call Trace: [ 42.506043] dump_stack+0x194/0x257 [ 42.506551] ? arch_local_irq_restore+0x53/0x53 [ 42.507217] lockdep_rcu_suspicious+0x123/0x170 [ 42.507860] kvm_dev_ioctl+0x877/0x1840 [ 42.508389] ? lock_downgrade+0x990/0x990 [ 42.508952] ? install_new_memslots+0x420/0x420 [ 42.509587] ? avc_has_extended_perms+0x7fa/0x12c0 [ 42.510241] ? find_held_lock+0x35/0x1d0 [ 42.510795] ? avc_ss_reset+0x110/0x110 [ 42.512661] ? lock_downgrade+0x990/0x990 [ 42.516779] ? lock_release+0xa40/0xa40 [ 42.520722] ? __lock_is_held+0xb6/0x140 [ 42.524778] ? check_same_owner+0x320/0x320 [ 42.529092] ? install_new_memslots+0x420/0x420 [ 42.533737] do_vfs_ioctl+0x1b1/0x1520 executing program [ 42.537600] ? ioctl_preallocate+0x2b0/0x2b0 [ 42.541982] ? selinux_capable+0x40/0x40 [ 42.546012] ? lock_downgrade+0x871/0x990 [ 42.550140] ? syscall_return_slowpath+0x22f/0x450 [ 42.555056] ? security_file_ioctl+0x7d/0xb0 [ 42.559441] ? security_file_ioctl+0x89/0xb0 [ 42.563831] SyS_ioctl+0x8f/0xc0 [ 42.567181] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 42.571910] RIP: 0033:0x446269 [ 42.575071] RSP: 002b:00007fc0a8a20dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 42.582749] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446269 executing program executing program executing program [ 42.589987] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 42.597226] RBP: 0000000000000086 R08: 00007fc0a8a21700 R09: 00007fc0a8a21700 [ 42.604462] R10: 00007fc0a8a21700 R11: 0000000000000202 R12: 0000000000000000 [ 42.611702] R13: 00007ffc944c9c3f R14: 00007fc0a8a219c0 R15: 0000000000000000 [ 42.619114] [ 42.621825] ============================= [ 42.626390] WARNING: suspicious RCU usage [ 42.631605] 4.13.0-rc5+ #42 Not tainted executing program executing program executing program executing program [ 42.639255] ----------------------------- [ 42.644675] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 42.657621] [ 42.657621] other info that might help us debug this: [ 42.657621] [ 42.666642] [ 42.666642] rcu_scheduler_active = 2, debug_locks = 1 [ 42.674262] no locks held by syzkaller685971/4388. [ 42.681140] [ 42.681140] stack backtrace: [ 42.685913] CPU: 0 PID: 4388 Comm: syzkaller685971 Not tainted 4.13.0-rc5+ #42 [ 42.693241] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.702569] Call Trace: [ 42.705129] dump_stack+0x194/0x257 [ 42.708728] ? arch_local_irq_restore+0x53/0x53 [ 42.713373] lockdep_rcu_suspicious+0x123/0x170 [ 42.718014] kvm_dev_ioctl+0xd21/0x1840 [ 42.721952] ? lock_downgrade+0x990/0x990 [ 42.726076] ? install_new_memslots+0x420/0x420 [ 42.730729] ? avc_has_extended_perms+0x7fa/0x12c0 [ 42.735622] ? find_held_lock+0x35/0x1d0 executing program executing program executing program [ 42.739657] ? avc_ss_reset+0x110/0x110 [ 42.743596] ? lock_downgrade+0x990/0x990 [ 42.747712] ? lock_release+0xa40/0xa40 [ 42.751656] ? __lock_is_held+0xb6/0x140 [ 42.755709] ? check_same_owner+0x320/0x320 [ 42.760015] ? install_new_memslots+0x420/0x420 [ 42.764654] do_vfs_ioctl+0x1b1/0x1520 [ 42.768522] ? ioctl_preallocate+0x2b0/0x2b0 [ 42.772901] ? selinux_capable+0x40/0x40 [ 42.776938] ? lock_downgrade+0x871/0x990 [ 42.781059] ? syscall_return_slowpath+0x22f/0x450 [ 42.785965] ? security_file_ioctl+0x7d/0xb0 executing program [ 42.790341] ? security_file_ioctl+0x89/0xb0 [ 42.794721] SyS_ioctl+0x8f/0xc0 [ 42.798062] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 42.802783] RIP: 0033:0x446269 [ 42.805941] RSP: 002b:00007fc0a8a20dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 42.813616] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446269 [ 42.820857] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 42.828101] RBP: 0000000000000086 R08: 00007fc0a8a21700 R09: 00007fc0a8a21700 [ 42.835345] R10: 00007fc0a8a21700 R11: 0000000000000202 R12: 0000000000000000 executing program executing program executing program executing program executing program executing program [ 42.842593] R13: 00007ffc944c9c3f R14: 00007fc0a8a219c0 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