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-0,10.128.0.60' (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 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 50.570193] [ 50.570587] ============================= [ 50.573201] WARNING: suspicious RCU usage [ 50.573818] 4.13.0-rc7+ #60 Not tainted [ 50.574963] ----------------------------- [ 50.576322] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 50.580228] [ 50.580228] other info that might help us debug this: [ 50.580228] [ 50.582741] [ 50.582741] rcu_scheduler_active = 2, debug_locks = 1 [ 50.585444] no locks held by syzkaller838882/17840. [ 50.587087] [ 50.587087] stack backtrace: [ 50.588939] CPU: 1 PID: 17840 Comm: syzkaller838882 Not tainted 4.13.0-rc7+ #60 [ 50.589979] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.597228] Call Trace: [ 50.599808] dump_stack+0x194/0x257 [ 50.603420] ? arch_local_irq_restore+0x53/0x53 [ 50.608084] lockdep_rcu_suspicious+0x123/0x170 [ 50.612745] kvm_dev_ioctl+0x877/0x1840 executing program executing program [ 50.616702] ? lock_downgrade+0x990/0x990 [ 50.620838] ? install_new_memslots+0x420/0x420 [ 50.625508] ? avc_has_extended_perms+0x7fa/0x12c0 [ 50.630419] ? find_held_lock+0x35/0x1d0 [ 50.634486] ? avc_ss_reset+0x110/0x110 [ 50.638441] ? lock_downgrade+0x990/0x990 [ 50.642564] ? lock_release+0xa40/0xa40 [ 50.646510] ? __lock_is_held+0xb6/0x140 [ 50.650590] ? check_same_owner+0x320/0x320 [ 50.654917] ? install_new_memslots+0x420/0x420 [ 50.659577] do_vfs_ioctl+0x1b1/0x1520 [ 50.663461] ? ioctl_preallocate+0x2b0/0x2b0 [ 50.667862] ? selinux_capable+0x40/0x40 [ 50.671924] ? syscall_return_slowpath+0x22f/0x450 [ 50.676851] ? security_file_ioctl+0x7d/0xb0 [ 50.681239] ? security_file_ioctl+0x89/0xb0 [ 50.685633] SyS_ioctl+0x8f/0xc0 [ 50.688996] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 50.693727] RIP: 0033:0x44a179 [ 50.696884] RSP: 002b:00007fa8f268cdc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 50.704564] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044a179 [ 50.711821] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000008 executing program executing program executing program [ 50.719072] RBP: 0000000000000086 R08: 00007fa8f268d700 R09: 00007fa8f268d700 [ 50.726320] R10: 00007fa8f268d700 R11: 0000000000000202 R12: 0000000000000000 [ 50.733566] R13: 00007ffd63b1ce6f R14: 00007fa8f268d9c0 R15: 0000000000000000 [ 50.741059] [ 50.748805] ============================= [ 50.757796] WARNING: suspicious RCU usage [ 50.763802] 4.13.0-rc7+ #60 Not tainted executing program executing program [ 50.769841] ----------------------------- [ 50.781047] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 50.794532] [ 50.794532] other info that might help us debug this: [ 50.794532] [ 50.803741] [ 50.803741] rcu_scheduler_active = 2, debug_locks = 1 executing program executing program [ 50.816510] no locks held by syzkaller838882/17840. [ 50.826736] [ 50.826736] stack backtrace: [ 50.834411] CPU: 1 PID: 17840 Comm: syzkaller838882 Not tainted 4.13.0-rc7+ #60 [ 50.841850] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.851185] Call Trace: [ 50.853768] dump_stack+0x194/0x257 [ 50.857389] ? arch_local_irq_restore+0x53/0x53 [ 50.862060] lockdep_rcu_suspicious+0x123/0x170 [ 50.866717] kvm_dev_ioctl+0xd21/0x1840 executing program executing program executing program [ 50.870673] ? lock_downgrade+0x990/0x990 [ 50.874827] ? install_new_memslots+0x420/0x420 [ 50.879507] ? avc_has_extended_perms+0x7fa/0x12c0 [ 50.884418] ? find_held_lock+0x35/0x1d0 [ 50.888483] ? avc_ss_reset+0x110/0x110 [ 50.892434] ? lock_downgrade+0x990/0x990 [ 50.896567] ? lock_release+0xa40/0xa40 [ 50.900535] ? __lock_is_held+0xb6/0x140 [ 50.904621] ? check_same_owner+0x320/0x320 [ 50.908949] ? install_new_memslots+0x420/0x420 [ 50.913603] do_vfs_ioctl+0x1b1/0x1520 [ 50.917496] ? ioctl_preallocate+0x2b0/0x2b0 executing program executing program [ 50.921894] ? selinux_capable+0x40/0x40 [ 50.925959] ? syscall_return_slowpath+0x22f/0x450 [ 50.930874] ? security_file_ioctl+0x7d/0xb0 [ 50.935259] ? security_file_ioctl+0x89/0xb0 [ 50.939659] SyS_ioctl+0x8f/0xc0 [ 50.943015] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 50.947747] RIP: 0033:0x44a179 [ 50.950910] RSP: 002b:00007fa8f268cdc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 50.958600] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044a179 executing program executing program executing program executing program [ 50.965852] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000008 [ 50.973103] RBP: 0000000000000086 R08: 00007fa8f268d700 R09: 00007fa8f268d700 [ 50.980359] R10: 00007fa8f268d700 R11: 0000000000000202 R12: 0000000000000000 [ 50.987613] R13: 00007ffd63b1ce6f R14: 00007fa8f268d9c0 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