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-6,10.128.0.61' (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 syzkaller login: [ 46.109847] [ 46.111064] ============================= [ 46.118337] WARNING: suspicious RCU usage [ 46.120390] 4.13.0-rc6+ #50 Not tainted [ 46.124107] ----------------------------- [ 46.126105] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 46.128677] [ 46.128677] other info that might help us debug this: [ 46.128677] [ 46.131441] [ 46.131441] rcu_scheduler_active = 2, debug_locks = 1 [ 46.150612] no locks held by syzkaller820358/6367. executing program executing program executing program executing program [ 46.173069] [ 46.173069] stack backtrace: [ 46.197735] CPU: 0 PID: 6367 Comm: syzkaller820358 Not tainted 4.13.0-rc6+ #50 [ 46.205132] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.214480] Call Trace: [ 46.217071] dump_stack+0x194/0x257 [ 46.220696] ? arch_local_irq_restore+0x53/0x53 [ 46.225368] lockdep_rcu_suspicious+0x123/0x170 [ 46.230029] kvm_dev_ioctl+0x877/0x1840 [ 46.234012] ? lock_downgrade+0x990/0x990 [ 46.238163] ? install_new_memslots+0x420/0x420 [ 46.242845] ? avc_has_extended_perms+0x7fa/0x12c0 [ 46.247744] ? find_held_lock+0x35/0x1d0 [ 46.251788] ? avc_ss_reset+0x110/0x110 [ 46.255728] ? lock_downgrade+0x990/0x990 [ 46.259845] ? lock_release+0xa40/0xa40 [ 46.263788] ? __lock_is_held+0xb6/0x140 [ 46.267865] ? check_same_owner+0x320/0x320 [ 46.272283] ? install_new_memslots+0x420/0x420 [ 46.276936] do_vfs_ioctl+0x1b1/0x1520 [ 46.280811] ? ioctl_preallocate+0x2b0/0x2b0 [ 46.285300] ? selinux_capable+0x40/0x40 [ 46.289343] ? lock_release+0x1d1/0xa40 [ 46.293293] ? syscall_return_slowpath+0x22f/0x450 [ 46.298222] ? security_file_ioctl+0x7d/0xb0 [ 46.302598] ? security_file_ioctl+0x89/0xb0 [ 46.306978] SyS_ioctl+0x8f/0xc0 [ 46.310315] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 46.315041] RIP: 0033:0x4463d9 [ 46.318197] RSP: 002b:00007f0f6697adc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 46.325876] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004463d9 [ 46.333115] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 46.341321] RBP: 0000000000000086 R08: 00007f0f6697b700 R09: 00007f0f6697b700 executing program executing program executing program executing program executing program executing program [ 46.348562] R10: 00007f0f6697b700 R11: 0000000000000202 R12: 0000000000000000 [ 46.355809] R13: 00007ffe476b5b2f R14: 00007f0f6697b9c0 R15: 0000000000000000 [ 46.363293] [ 46.367960] ============================= [ 46.374164] WARNING: suspicious RCU usage [ 46.383981] 4.13.0-rc6+ #50 Not tainted [ 46.393766] ----------------------------- executing program [ 46.403996] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 46.424812] [ 46.424812] other info that might help us debug this: [ 46.424812] [ 46.433087] [ 46.433087] rcu_scheduler_active = 2, debug_locks = 1 [ 46.440810] no locks held by syzkaller820358/6367. [ 46.446422] [ 46.446422] stack backtrace: executing program [ 46.453082] CPU: 0 PID: 6367 Comm: syzkaller820358 Not tainted 4.13.0-rc6+ #50 [ 46.460435] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.469764] Call Trace: [ 46.472324] dump_stack+0x194/0x257 [ 46.475939] ? arch_local_irq_restore+0x53/0x53 [ 46.480616] lockdep_rcu_suspicious+0x123/0x170 [ 46.485278] kvm_dev_ioctl+0xd21/0x1840 [ 46.489252] ? lock_downgrade+0x990/0x990 [ 46.493390] ? install_new_memslots+0x420/0x420 [ 46.498066] ? avc_has_extended_perms+0x7fa/0x12c0 executing program executing program executing program [ 46.502976] ? find_held_lock+0x35/0x1d0 [ 46.507048] ? avc_ss_reset+0x110/0x110 [ 46.511006] ? lock_downgrade+0x990/0x990 [ 46.515145] ? lock_release+0xa40/0xa40 [ 46.519114] ? __lock_is_held+0xb6/0x140 [ 46.523215] ? check_same_owner+0x320/0x320 [ 46.527547] ? install_new_memslots+0x420/0x420 [ 46.532287] do_vfs_ioctl+0x1b1/0x1520 [ 46.536170] ? ioctl_preallocate+0x2b0/0x2b0 [ 46.540574] ? selinux_capable+0x40/0x40 [ 46.544626] ? lock_release+0x1d1/0xa40 [ 46.548699] ? syscall_return_slowpath+0x22f/0x450 executing program executing program executing program executing program executing program [ 46.553635] ? security_file_ioctl+0x7d/0xb0 [ 46.558030] ? security_file_ioctl+0x89/0xb0 [ 46.562434] SyS_ioctl+0x8f/0xc0 [ 46.565795] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 46.570538] RIP: 0033:0x4463d9 [ 46.573712] RSP: 002b:00007f0f6697adc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 46.581405] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004463d9 [ 46.588660] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 46.595916] RBP: 0000000000000086 R08: 00007f0f6697b700 R09: 00007f0f6697b700 executing program executing program executing program [ 46.603173] R10: 00007f0f6697b700 R11: 0000000000000202 R12: 0000000000000000 [ 46.610440] R13: 00007ffe476b5b2f R14: 00007f0f6697b9c0 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