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-7,10.128.0.32' (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 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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 syzkaller login: [ 60.231420] [ 60.231799] ============================= [ 60.235622] WARNING: suspicious RCU usage [ 60.240273] 4.13.0-rc6+ #45 Not tainted [ 60.242874] ----------------------------- [ 60.247085] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 60.252855] [ 60.252855] other info that might help us debug this: [ 60.252855] executing program executing program executing program [ 60.281110] [ 60.281110] rcu_scheduler_active = 2, debug_locks = 1 [ 60.300891] no locks held by syzkaller200724/12347. [ 60.311962] [ 60.311962] stack backtrace: [ 60.323584] CPU: 1 PID: 12347 Comm: syzkaller200724 Not tainted 4.13.0-rc6+ #45 [ 60.331037] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.340377] Call Trace: [ 60.342983] dump_stack+0x194/0x257 [ 60.346605] ? arch_local_irq_restore+0x53/0x53 [ 60.351311] lockdep_rcu_suspicious+0x123/0x170 [ 60.355990] kvm_dev_ioctl+0x877/0x1840 [ 60.359955] ? lock_downgrade+0x990/0x990 [ 60.364098] ? install_new_memslots+0x420/0x420 [ 60.368797] ? avc_has_extended_perms+0x7fa/0x12c0 [ 60.373713] ? find_held_lock+0x35/0x1d0 [ 60.377779] ? avc_ss_reset+0x110/0x110 executing program executing program [ 60.381743] ? lock_downgrade+0x990/0x990 [ 60.385885] ? lock_release+0xa40/0xa40 [ 60.389861] ? __lock_is_held+0xb6/0x140 [ 60.393954] ? check_same_owner+0x320/0x320 [ 60.398300] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 60.403406] ? install_new_memslots+0x420/0x420 [ 60.408064] do_vfs_ioctl+0x1b1/0x1520 [ 60.411951] ? ioctl_preallocate+0x2b0/0x2b0 [ 60.416355] ? selinux_capable+0x40/0x40 [ 60.420422] ? syscall_return_slowpath+0x22f/0x450 [ 60.425354] ? security_file_ioctl+0x7d/0xb0 [ 60.429751] ? security_file_ioctl+0x89/0xb0 [ 60.434152] SyS_ioctl+0x8f/0xc0 [ 60.437517] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 60.442255] RIP: 0033:0x446239 [ 60.445433] RSP: 002b:00007f57da375dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 60.453201] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446239 [ 60.460462] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000005 [ 60.467716] RBP: 0000000000000086 R08: 00007f57da376700 R09: 00007f57da376700 [ 60.474975] R10: 00007f57da376700 R11: 0000000000000246 R12: 0000000000000000 executing program executing program executing program executing program executing program [ 60.482239] R13: 00007ffd4a75d2bf R14: 00007f57da3769c0 R15: 0000000000000000 [ 60.489685] [ 60.506544] ============================= [ 60.514656] WARNING: suspicious RCU usage [ 60.524380] 4.13.0-rc6+ #45 Not tainted executing program executing program executing program [ 60.539953] ----------------------------- [ 60.552112] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 60.564415] [ 60.564415] other info that might help us debug this: [ 60.564415] [ 60.573838] [ 60.573838] rcu_scheduler_active = 2, debug_locks = 1 [ 60.581792] no locks held by syzkaller200724/12347. [ 60.587653] executing program [ 60.587653] stack backtrace: [ 60.593852] CPU: 1 PID: 12347 Comm: syzkaller200724 Not tainted 4.13.0-rc6+ #45 [ 60.601294] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.610628] Call Trace: [ 60.613220] dump_stack+0x194/0x257 [ 60.616842] ? arch_local_irq_restore+0x53/0x53 [ 60.621520] lockdep_rcu_suspicious+0x123/0x170 [ 60.626185] kvm_dev_ioctl+0xd21/0x1840 [ 60.630145] ? lock_downgrade+0x990/0x990 [ 60.634295] ? install_new_memslots+0x420/0x420 [ 60.638979] ? avc_has_extended_perms+0x7fa/0x12c0 [ 60.643898] ? find_held_lock+0x35/0x1d0 [ 60.647967] ? avc_ss_reset+0x110/0x110 [ 60.651928] ? lock_downgrade+0x990/0x990 [ 60.656067] ? lock_release+0xa40/0xa40 [ 60.660037] ? __lock_is_held+0xb6/0x140 [ 60.664132] ? check_same_owner+0x320/0x320 [ 60.668450] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 60.673558] ? install_new_memslots+0x420/0x420 [ 60.678222] do_vfs_ioctl+0x1b1/0x1520 [ 60.682109] ? ioctl_preallocate+0x2b0/0x2b0 [ 60.686510] ? selinux_capable+0x40/0x40 [ 60.690578] ? syscall_return_slowpath+0x22f/0x450 [ 60.695510] ? security_file_ioctl+0x7d/0xb0 [ 60.699908] ? security_file_ioctl+0x89/0xb0 [ 60.704310] SyS_ioctl+0x8f/0xc0 [ 60.707671] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 60.712411] RIP: 0033:0x446239 [ 60.715588] RSP: 002b:00007f57da375dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 60.723290] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446239 [ 60.730548] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000005 executing program executing program executing program executing program executing program executing program [ 60.737807] RBP: 0000000000000086 R08: 00007f57da376700 R09: 00007f57da376700 [ 60.745327] R10: 00007f57da376700 R11: 0000000000000246 R12: 0000000000000000 [ 60.752583] R13: 00007ffd4a75d2bf R14: 00007f57da3769c0 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