INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-upstream-kasan-gce-0,10.128.15.204' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 50.431239] [ 50.450502] ============================= executing program executing program executing program [ 50.496108] WARNING: suspicious RCU usage executing program executing program [ 50.518550] 4.13.0+ #79 Not tainted [ 50.524988] ----------------------------- [ 50.534614] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! executing program executing program executing program executing program executing program [ 50.562223] [ 50.562223] other info that might help us debug this: [ 50.562223] [ 50.575665] [ 50.575665] rcu_scheduler_active = 2, debug_locks = 1 [ 50.587513] no locks held by syzkaller012160/5601. executing program executing program executing program [ 50.626936] [ 50.626936] stack backtrace: [ 50.646863] CPU: 0 PID: 5601 Comm: syzkaller012160 Not tainted 4.13.0+ #79 [ 50.653920] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.663273] Call Trace: [ 50.665857] dump_stack+0x194/0x257 [ 50.669484] ? arch_local_irq_restore+0x53/0x53 [ 50.674169] lockdep_rcu_suspicious+0x123/0x170 [ 50.678842] kvm_dev_ioctl+0x877/0x1840 [ 50.682834] ? install_new_memslots+0x420/0x420 [ 50.687533] ? avc_has_extended_perms+0x7fa/0x12c0 [ 50.692454] ? lock_downgrade+0x990/0x990 [ 50.696613] ? avc_ss_reset+0x110/0x110 [ 50.700589] ? lock_release+0xd70/0xd70 [ 50.704564] ? __lock_is_held+0xbc/0x140 [ 50.708666] ? check_same_owner+0x320/0x320 [ 50.712980] ? rcu_pm_notify+0xc0/0xc0 [ 50.716887] ? install_new_memslots+0x420/0x420 [ 50.721551] do_vfs_ioctl+0x1b1/0x1530 [ 50.725443] ? ioctl_preallocate+0x2b0/0x2b0 [ 50.729851] ? selinux_capable+0x40/0x40 [ 50.733911] ? debug_check_no_locks_freed+0x2c1/0x3d0 [ 50.739098] ? lockdep_invariant_state+0x7b/0x120 [ 50.743939] ? syscall_return_slowpath+0x2b3/0x500 [ 50.748860] ? finish_task_switch+0x1aa/0x740 [ 50.753365] ? security_file_ioctl+0x7d/0xb0 [ 50.757767] ? security_file_ioctl+0x89/0xb0 [ 50.762175] SyS_ioctl+0x8f/0xc0 [ 50.765551] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 50.770298] RIP: 0033:0x446209 executing program [ 50.773477] RSP: 002b:00007fe84b0ccdc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 50.781186] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 50.788448] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 50.795710] RBP: 0000000000000082 R08: 00007fe84b0cd700 R09: 00007fe84b0cd700 [ 50.802969] R10: 00007fe84b0cd700 R11: 0000000000000246 R12: 0000000000000000 [ 50.810229] R13: 00007ffc3773663f R14: 00007fe84b0cd9c0 R15: 0000000000000000 [ 50.817955] executing program executing program executing program executing program executing program executing program executing program [ 50.825473] ============================= [ 50.832950] WARNING: suspicious RCU usage [ 50.838464] 4.13.0+ #79 Not tainted [ 50.843101] ----------------------------- [ 50.848202] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 50.862564] [ 50.862564] other info that might help us debug this: [ 50.862564] executing program executing program executing program executing program [ 50.886728] [ 50.886728] rcu_scheduler_active = 2, debug_locks = 1 [ 50.897907] no locks held by syzkaller012160/5601. [ 50.903565] [ 50.903565] stack backtrace: [ 50.919859] CPU: 0 PID: 5601 Comm: syzkaller012160 Not tainted 4.13.0+ #79 [ 50.926931] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.936278] Call Trace: [ 50.938861] dump_stack+0x194/0x257 [ 50.942498] ? arch_local_irq_restore+0x53/0x53 [ 50.947184] lockdep_rcu_suspicious+0x123/0x170 [ 50.951853] kvm_dev_ioctl+0xd21/0x1840 [ 50.955837] ? install_new_memslots+0x420/0x420 [ 50.960532] ? avc_has_extended_perms+0x7fa/0x12c0 [ 50.965456] ? lock_downgrade+0x990/0x990 [ 50.969618] ? avc_ss_reset+0x110/0x110 [ 50.973598] ? lock_release+0xd70/0xd70 [ 50.977573] ? __lock_is_held+0xbc/0x140 [ 50.981673] ? check_same_owner+0x320/0x320 [ 50.985987] ? rcu_pm_notify+0xc0/0xc0 [ 50.989894] ? install_new_memslots+0x420/0x420 [ 50.994561] do_vfs_ioctl+0x1b1/0x1530 [ 50.998456] ? ioctl_preallocate+0x2b0/0x2b0 [ 51.002867] ? selinux_capable+0x40/0x40 [ 51.006929] ? debug_check_no_locks_freed+0x2c1/0x3d0 [ 51.012117] ? lockdep_invariant_state+0x7b/0x120 [ 51.016957] ? syscall_return_slowpath+0x2b3/0x500 [ 51.021881] ? finish_task_switch+0x1aa/0x740 [ 51.026391] ? security_file_ioctl+0x7d/0xb0 [ 51.030796] ? security_file_ioctl+0x89/0xb0 [ 51.035207] SyS_ioctl+0x8f/0xc0 [ 51.038578] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 51.043326] RIP: 0033:0x446209 [ 51.046512] RSP: 002b:00007fe84b0ccdc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 51.054220] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 51.061489] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 51.068751] RBP: 0000000000000082 R08: 00007fe84b0cd700 R09: 00007fe84b0cd700 [ 51.076012] R10: 00007fe84b0cd700 R11: 0000000000000246 R12: 0000000000000000 executing program executing program executing program executing program executing program executing program [ 51.083273] R13: 00007ffc3773663f R14: 00007fe84b0cd9c0 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