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-2,10.128.0.25' (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 syzkaller login: [ 66.146560] [ 66.146886] ============================= [ 66.149183] WARNING: suspicious RCU usage [ 66.149784] 4.13.0-rc7+ #64 Not tainted [ 66.151142] ----------------------------- [ 66.151885] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 66.153952] [ 66.153952] other info that might help us debug this: [ 66.153952] [ 66.155718] [ 66.155718] rcu_scheduler_active = 2, debug_locks = 1 [ 66.156866] no locks held by syzkaller020248/4952. [ 66.157627] [ 66.157627] stack backtrace: [ 66.158523] CPU: 0 PID: 4952 Comm: syzkaller020248 Not tainted 4.13.0-rc7+ #64 [ 66.159559] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.160929] Call Trace: [ 66.161303] dump_stack+0x194/0x257 [ 66.161833] ? arch_local_irq_restore+0x53/0x53 [ 66.162488] lockdep_rcu_suspicious+0x123/0x170 [ 66.163170] kvm_dev_ioctl+0x877/0x1840 [ 66.163755] ? lock_downgrade+0x990/0x990 [ 66.164387] ? install_new_memslots+0x420/0x420 [ 66.165071] ? avc_has_extended_perms+0x7fa/0x12c0 [ 66.165841] ? find_held_lock+0x35/0x1d0 [ 66.166617] ? avc_ss_reset+0x110/0x110 [ 66.170448] ? lock_downgrade+0x990/0x990 [ 66.174586] ? lock_release+0xa40/0xa40 [ 66.178551] ? __lock_is_held+0xb6/0x140 [ 66.182643] ? check_same_owner+0x320/0x320 [ 66.186976] ? install_new_memslots+0x420/0x420 [ 66.191635] do_vfs_ioctl+0x1b1/0x1520 [ 66.195521] ? ioctl_preallocate+0x2b0/0x2b0 [ 66.199920] ? selinux_capable+0x40/0x40 [ 66.203965] ? lock_release+0x91/0xa40 [ 66.207850] ? syscall_return_slowpath+0x22f/0x450 [ 66.212777] ? security_file_ioctl+0x7d/0xb0 [ 66.217171] ? security_file_ioctl+0x89/0xb0 [ 66.221571] SyS_ioctl+0x8f/0xc0 [ 66.224933] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 66.229667] RIP: 0033:0x446209 [ 66.232837] RSP: 002b:00007ff93e69adc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 executing program [ 66.240529] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 66.247779] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 66.255032] RBP: 0000000000000086 R08: 00007ff93e69b700 R09: 00007ff93e69b700 [ 66.262286] R10: 00007ff93e69b700 R11: 0000000000000246 R12: 0000000000000000 [ 66.269541] R13: 00007fff942769ff R14: 00007ff93e69b9c0 R15: 0000000000000000 [ 66.277073] executing program executing program executing program executing program executing program executing program executing program executing program [ 66.299551] ============================= [ 66.308457] WARNING: suspicious RCU usage [ 66.317856] 4.13.0-rc7+ #64 Not tainted [ 66.331096] ----------------------------- executing program executing program executing program executing program [ 66.355538] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 66.367367] [ 66.367367] other info that might help us debug this: [ 66.367367] [ 66.380209] [ 66.380209] rcu_scheduler_active = 2, debug_locks = 1 [ 66.388530] no locks held by syzkaller020248/4952. [ 66.394420] [ 66.394420] stack backtrace: executing program executing program executing program [ 66.411917] CPU: 0 PID: 4952 Comm: syzkaller020248 Not tainted 4.13.0-rc7+ #64 [ 66.419282] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.428622] Call Trace: [ 66.431199] dump_stack+0x194/0x257 [ 66.434823] ? arch_local_irq_restore+0x53/0x53 [ 66.439502] lockdep_rcu_suspicious+0x123/0x170 [ 66.444166] kvm_dev_ioctl+0xd21/0x1840 [ 66.448123] ? lock_downgrade+0x990/0x990 [ 66.452277] ? install_new_memslots+0x420/0x420 [ 66.456962] ? avc_has_extended_perms+0x7fa/0x12c0 executing program executing program executing program [ 66.461879] ? find_held_lock+0x35/0x1d0 [ 66.465944] ? avc_ss_reset+0x110/0x110 [ 66.469903] ? lock_downgrade+0x990/0x990 [ 66.474041] ? lock_release+0xa40/0xa40 [ 66.478010] ? __lock_is_held+0xb6/0x140 [ 66.482102] ? check_same_owner+0x320/0x320 [ 66.486441] ? install_new_memslots+0x420/0x420 [ 66.491098] do_vfs_ioctl+0x1b1/0x1520 [ 66.494998] ? ioctl_preallocate+0x2b0/0x2b0 [ 66.499398] ? selinux_capable+0x40/0x40 [ 66.503449] ? lock_release+0x91/0xa40 [ 66.507334] ? syscall_return_slowpath+0x22f/0x450 executing program [ 66.512264] ? security_file_ioctl+0x7d/0xb0 [ 66.516659] ? security_file_ioctl+0x89/0xb0 [ 66.521064] SyS_ioctl+0x8f/0xc0 [ 66.524427] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 66.529168] RIP: 0033:0x446209 [ 66.532339] RSP: 002b:00007ff93e69adc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 66.540030] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 [ 66.547284] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 66.554545] RBP: 0000000000000086 R08: 00007ff93e69b700 R09: 00007ff93e69b700 executing program executing program executing program executing program [ 66.561809] R10: 00007ff93e69b700 R11: 0000000000000246 R12: 0000000000000000 [ 66.569063] R13: 00007fff942769ff R14: 00007ff93e69b9c0 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 executing program executing program