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-mmots-kasan-gce-5,10.128.0.53' (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 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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 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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 syzkaller login: [ 55.109598] [ 55.114657] ============================= [ 55.126846] WARNING: suspicious RCU usage [ 55.131649] 4.13.0-mm1+ #7 Not tainted [ 55.137945] ----------------------------- [ 55.148878] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! executing program executing program executing program executing program [ 55.175330] [ 55.175330] other info that might help us debug this: [ 55.175330] [ 55.187188] [ 55.187192] ============================= [ 55.187197] WARNING: suspicious RCU usage [ 55.187204] 4.13.0-mm1+ #7 Not tainted executing program executing program executing program executing program executing program [ 55.187209] ----------------------------- [ 55.187216] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 55.187220] [ 55.187220] other info that might help us debug this: [ 55.187220] executing program executing program executing program executing program executing program [ 55.187231] [ 55.187231] rcu_scheduler_active = 2, debug_locks = 1 [ 55.187237] no locks held by syzkaller692715/9251. [ 55.187242] [ 55.187242] stack backtrace: [ 55.187251] CPU: 0 PID: 9251 Comm: syzkaller692715 Not tainted 4.13.0-mm1+ #7 executing program executing program executing program executing program executing program executing program [ 55.187257] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.187262] Call Trace: [ 55.187278] dump_stack+0x194/0x257 [ 55.187295] ? arch_local_irq_restore+0x53/0x53 [ 55.187329] lockdep_rcu_suspicious+0x123/0x170 executing program executing program executing program [ 55.187348] kvm_dev_ioctl+0xd21/0x1840 [ 55.187375] ? install_new_memslots+0x420/0x420 [ 55.187414] ? avc_has_extended_perms+0x7fa/0x12c0 [ 55.187422] ? lock_downgrade+0x990/0x990 [ 55.187451] ? avc_ss_reset+0x110/0x110 [ 55.187470] ? lock_release+0xd70/0xd70 [ 55.187487] ? __lock_is_held+0xbc/0x140 [ 55.187545] ? check_same_owner+0x320/0x320 [ 55.187555] ? rcu_pm_notify+0xc0/0xc0 [ 55.187587] ? install_new_memslots+0x420/0x420 executing program executing program executing program executing program executing program [ 55.187601] do_vfs_ioctl+0x1b1/0x1530 executing program executing program executing program [ 55.187623] ? ioctl_preallocate+0x2b0/0x2b0 [ 55.187639] ? selinux_capable+0x40/0x40 [ 55.187652] ? __lock_acquire+0x1651/0x4620 [ 55.187668] ? lockdep_invariant_state+0xdb/0x120 [ 55.187681] ? syscall_return_slowpath+0x2b3/0x500 executing program executing program [ 55.187689] ? finish_task_switch+0x1aa/0x740 [ 55.187712] ? security_file_ioctl+0x7d/0xb0 [ 55.187719] ? security_file_ioctl+0x89/0xb0 [ 55.187737] SyS_ioctl+0x8f/0xc0 [ 55.187758] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 55.187766] RIP: 0033:0x446209 [ 55.187772] RSP: 002b:00007fd9f5207dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 55.187784] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 executing program executing program executing program [ 55.187791] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 [ 55.187797] RBP: 0000000000000082 R08: 00007fd9f5208700 R09: 00007fd9f5208700 [ 55.187803] R10: 00007fd9f5208700 R11: 0000000000000246 R12: 0000000000000000 executing program executing program executing program executing program executing program [ 55.187810] R13: 00007fff879f766f R14: 00007fd9f52089c0 R15: 0000000000000000 [ 55.684416] [ 55.684416] rcu_scheduler_active = 2, debug_locks = 1 [ 55.713839] no locks held by syzkaller692715/9228. [ 55.723461] [ 55.723461] stack backtrace: [ 55.732239] CPU: 1 PID: 9228 Comm: syzkaller692715 Not tainted 4.13.0-mm1+ #7 [ 55.739513] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.748857] Call Trace: [ 55.751442] dump_stack+0x194/0x257 [ 55.755070] ? arch_local_irq_restore+0x53/0x53 [ 55.759757] lockdep_rcu_suspicious+0x123/0x170 [ 55.764429] kvm_dev_ioctl+0x877/0x1840 [ 55.768418] ? install_new_memslots+0x420/0x420 [ 55.773111] ? avc_has_extended_perms+0x7fa/0x12c0 [ 55.778032] ? lock_downgrade+0x990/0x990 [ 55.782193] ? avc_ss_reset+0x110/0x110 [ 55.786169] ? lock_release+0xd70/0xd70 [ 55.790147] ? __lock_is_held+0xbc/0x140 [ 55.794251] ? check_same_owner+0x320/0x320 [ 55.798573] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 55.803691] ? install_new_memslots+0x420/0x420 [ 55.808354] do_vfs_ioctl+0x1b1/0x1530 [ 55.812251] ? ioctl_preallocate+0x2b0/0x2b0 [ 55.816659] ? selinux_capable+0x40/0x40 [ 55.820733] ? lockdep_invariant_state+0xdb/0x120 executing program [ 55.825575] ? syscall_return_slowpath+0x2b3/0x500 [ 55.830500] ? finish_task_switch+0x4c9/0x740 [ 55.835002] ? security_file_ioctl+0x7d/0xb0 [ 55.839405] ? security_file_ioctl+0x89/0xb0 [ 55.843815] SyS_ioctl+0x8f/0xc0 [ 55.847184] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 55.851932] RIP: 0033:0x446209 [ 55.855115] RSP: 002b:00007fd9f3a04dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 55.862821] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446209 executing program executing program executing program executing program [ 55.870082] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 55.877344] RBP: 0000000000000082 R08: 00007fd9f3a05700 R09: 00007fd9f3a05700 [ 55.884605] R10: 00007fd9f3a05700 R11: 0000000000000246 R12: 0000000000000000 [ 55.891865] R13: 00007fff879f766f R14: 00007fd9f3a059c0 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