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 syzkaller login: [ 48.323914] [ 48.329587] ============================= [ 48.347632] WARNING: suspicious RCU usage [ 48.353881] 4.13.0+ #76 Not tainted [ 48.361746] ----------------------------- executing program executing program executing program executing program executing program executing program [ 48.368630] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 48.388247] [ 48.388247] other info that might help us debug this: [ 48.388247] [ 48.400132] [ 48.400132] rcu_scheduler_active = 2, debug_locks = 1 [ 48.413067] no locks held by syzkaller823022/3438. executing program executing program [ 48.424829] [ 48.424829] stack backtrace: [ 48.435890] CPU: 0 PID: 3438 Comm: syzkaller823022 Not tainted 4.13.0+ #76 [ 48.442883] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.452206] Call Trace: [ 48.454766] dump_stack+0x194/0x257 [ 48.458365] ? arch_local_irq_restore+0x53/0x53 [ 48.463018] lockdep_rcu_suspicious+0x123/0x170 [ 48.467664] kvm_dev_ioctl+0x877/0x1840 [ 48.471617] ? install_new_memslots+0x420/0x420 [ 48.476270] ? avc_has_extended_perms+0x7fa/0x12c0 [ 48.481169] ? lock_downgrade+0x990/0x990 [ 48.485304] ? avc_ss_reset+0x110/0x110 [ 48.489259] ? lock_release+0xd70/0xd70 [ 48.493214] ? __lock_is_held+0xbc/0x140 [ 48.497273] ? check_same_owner+0x320/0x320 [ 48.501568] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 48.506650] ? install_new_memslots+0x420/0x420 [ 48.511290] do_vfs_ioctl+0x1b1/0x1530 [ 48.515154] ? ioctl_preallocate+0x2b0/0x2b0 [ 48.519537] ? selinux_capable+0x40/0x40 [ 48.523577] ? lockdep_invariant_state+0x7b/0x120 [ 48.528392] ? syscall_return_slowpath+0x2b3/0x500 [ 48.533291] ? finish_task_switch+0x4c9/0x740 [ 48.537765] ? security_file_ioctl+0x7d/0xb0 [ 48.542141] ? security_file_ioctl+0x89/0xb0 [ 48.546523] SyS_ioctl+0x8f/0xc0 [ 48.549864] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 48.554590] RIP: 0033:0x4491b9 [ 48.557748] RSP: 002b:00007f7a07b56dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 48.565430] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004491b9 executing program executing program executing program executing program executing program [ 48.572670] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 48.579912] RBP: 0000000000000082 R08: 00007f7a07b57700 R09: 00007f7a07b57700 [ 48.587153] R10: 00007f7a07b57700 R11: 0000000000000202 R12: 0000000000000000 [ 48.594392] R13: 00007ffde078469f R14: 00007f7a07b579c0 R15: 0000000000000000 [ 48.601883] [ 48.607205] ============================= [ 48.612167] WARNING: suspicious RCU usage [ 48.618387] 4.13.0+ #76 Not tainted [ 48.622778] ----------------------------- [ 48.627851] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 48.636290] [ 48.636290] other info that might help us debug this: [ 48.636290] [ 48.644752] [ 48.644752] rcu_scheduler_active = 2, debug_locks = 1 [ 48.651672] no locks held by syzkaller823022/3438. [ 48.656834] [ 48.656834] stack backtrace: [ 48.661561] CPU: 0 PID: 3438 Comm: syzkaller823022 Not tainted 4.13.0+ #76 [ 48.668546] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.677868] Call Trace: [ 48.680432] dump_stack+0x194/0x257 [ 48.684032] ? arch_local_irq_restore+0x53/0x53 [ 48.688685] lockdep_rcu_suspicious+0x123/0x170 [ 48.693328] kvm_dev_ioctl+0xd21/0x1840 [ 48.697285] ? install_new_memslots+0x420/0x420 [ 48.701941] ? avc_has_extended_perms+0x7fa/0x12c0 [ 48.706841] ? lock_downgrade+0x990/0x990 [ 48.710969] ? avc_ss_reset+0x110/0x110 [ 48.714919] ? lock_release+0xd70/0xd70 [ 48.718869] ? __lock_is_held+0xbc/0x140 [ 48.722929] ? check_same_owner+0x320/0x320 [ 48.727226] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 48.732307] ? install_new_memslots+0x420/0x420 [ 48.736949] do_vfs_ioctl+0x1b1/0x1530 [ 48.740812] ? ioctl_preallocate+0x2b0/0x2b0 [ 48.745195] ? selinux_capable+0x40/0x40 [ 48.749234] ? lockdep_invariant_state+0x7b/0x120 [ 48.754047] ? syscall_return_slowpath+0x2b3/0x500 [ 48.758946] ? finish_task_switch+0x4c9/0x740 [ 48.763419] ? security_file_ioctl+0x7d/0xb0 [ 48.767801] ? security_file_ioctl+0x89/0xb0 [ 48.772182] SyS_ioctl+0x8f/0xc0 [ 48.775524] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 48.780255] RIP: 0033:0x4491b9 [ 48.783417] RSP: 002b:00007f7a07b56dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 48.791104] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004491b9 [ 48.798344] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 48.805584] RBP: 0000000000000082 R08: 00007f7a07b57700 R09: 00007f7a07b57700 [ 48.812823] R10: 00007f7a07b57700 R11: 0000000000000202 R12: 0000000000000000 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 48.820067] R13: 00007ffde078469f R14: 00007f7a07b579c0 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program