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-mmots-kasan-gce-4,10.128.15.206' (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 syzkaller login: [ 53.569244] [ 53.571244] ============================= [ 53.576232] WARNING: suspicious RCU usage [ 53.589833] 4.13.0-mm1+ #7 Not tainted [ 53.602822] ----------------------------- [ 53.609231] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! executing program executing program executing program [ 53.620976] [ 53.620976] other info that might help us debug this: [ 53.620976] [ 53.634327] [ 53.634327] rcu_scheduler_active = 2, debug_locks = 1 [ 53.641635] no locks held by syzkaller764399/4663. [ 53.649113] [ 53.649113] stack backtrace: [ 53.654214] CPU: 0 PID: 4663 Comm: syzkaller764399 Not tainted 4.13.0-mm1+ #7 [ 53.661481] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 executing program executing program [ 53.670822] Call Trace: [ 53.673390] dump_stack+0x194/0x257 [ 53.676994] ? arch_local_irq_restore+0x53/0x53 [ 53.681649] lockdep_rcu_suspicious+0x123/0x170 [ 53.686299] kvm_dev_ioctl+0x877/0x1840 [ 53.690254] ? install_new_memslots+0x420/0x420 [ 53.694912] ? avc_has_extended_perms+0x7fa/0x12c0 [ 53.699816] ? lock_downgrade+0x990/0x990 [ 53.703949] ? avc_ss_reset+0x110/0x110 [ 53.707900] ? lock_release+0xd70/0xd70 [ 53.711852] ? __lock_is_held+0xbc/0x140 [ 53.715915] ? check_same_owner+0x320/0x320 [ 53.720211] ? rcu_pm_notify+0xc0/0xc0 [ 53.724087] ? install_new_memslots+0x420/0x420 [ 53.728730] do_vfs_ioctl+0x1b1/0x1530 [ 53.732597] ? ioctl_preallocate+0x2b0/0x2b0 [ 53.737003] ? selinux_capable+0x40/0x40 [ 53.741057] ? __lock_acquire+0x1651/0x4620 [ 53.745359] ? lockdep_invariant_state+0xdb/0x120 [ 53.750176] ? syscall_return_slowpath+0x2b3/0x500 [ 53.755076] ? finish_task_switch+0x1aa/0x740 [ 53.759553] ? security_file_ioctl+0x7d/0xb0 [ 53.763931] ? security_file_ioctl+0x89/0xb0 [ 53.768319] SyS_ioctl+0x8f/0xc0 executing program [ 53.771667] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 53.776399] RIP: 0033:0x44a0c9 [ 53.779561] RSP: 002b:00007f101a8b1dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 53.787255] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044a0c9 [ 53.794507] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000009 [ 53.801754] RBP: 0000000000000082 R08: 00007f101a8b2700 R09: 00007f101a8b2700 [ 53.808994] R10: 00007f101a8b2700 R11: 0000000000000202 R12: 0000000000000000 executing program executing program executing program executing program [ 53.816237] R13: 00007ffddd34068f R14: 00007f101a8b29c0 R15: 0000000000000000 [ 53.823669] [ 53.833933] ============================= [ 53.839822] WARNING: suspicious RCU usage [ 53.847536] 4.13.0-mm1+ #7 Not tainted [ 53.852605] ----------------------------- [ 53.857417] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! executing program executing program [ 53.874324] [ 53.874324] other info that might help us debug this: [ 53.874324] [ 53.888173] [ 53.888173] rcu_scheduler_active = 2, debug_locks = 1 [ 53.896884] no locks held by syzkaller764399/4663. [ 53.902305] [ 53.902305] stack backtrace: [ 53.908961] CPU: 0 PID: 4663 Comm: syzkaller764399 Not tainted 4.13.0-mm1+ #7 executing program executing program [ 53.916218] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.925542] Call Trace: [ 53.928105] dump_stack+0x194/0x257 [ 53.931711] ? arch_local_irq_restore+0x53/0x53 [ 53.936371] lockdep_rcu_suspicious+0x123/0x170 [ 53.941017] kvm_dev_ioctl+0xd21/0x1840 [ 53.944974] ? install_new_memslots+0x420/0x420 [ 53.949636] ? avc_has_extended_perms+0x7fa/0x12c0 [ 53.954534] ? lock_downgrade+0x990/0x990 [ 53.958664] ? avc_ss_reset+0x110/0x110 [ 53.962614] ? lock_release+0xd70/0xd70 [ 53.966564] ? __lock_is_held+0xbc/0x140 [ 53.970626] ? check_same_owner+0x320/0x320 executing program executing program [ 53.974918] ? rcu_pm_notify+0xc0/0xc0 [ 53.978827] ? install_new_memslots+0x420/0x420 [ 53.983479] do_vfs_ioctl+0x1b1/0x1530 [ 53.987366] ? ioctl_preallocate+0x2b0/0x2b0 [ 53.991759] ? selinux_capable+0x40/0x40 [ 53.995798] ? __lock_acquire+0x1651/0x4620 [ 54.000095] ? lockdep_invariant_state+0xdb/0x120 [ 54.004908] ? syscall_return_slowpath+0x2b3/0x500 [ 54.009825] ? finish_task_switch+0x1aa/0x740 [ 54.014319] ? security_file_ioctl+0x7d/0xb0 [ 54.018699] ? security_file_ioctl+0x89/0xb0 [ 54.023083] SyS_ioctl+0x8f/0xc0 [ 54.026427] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 54.031154] RIP: 0033:0x44a0c9 [ 54.034314] RSP: 002b:00007f101a8b1dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 54.041996] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044a0c9 [ 54.049235] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000009 [ 54.056475] RBP: 0000000000000082 R08: 00007f101a8b2700 R09: 00007f101a8b2700 [ 54.063713] R10: 00007f101a8b2700 R11: 0000000000000202 R12: 0000000000000000 executing program executing program executing program executing program executing program [ 54.070953] R13: 00007ffddd34068f R14: 00007f101a8b29c0 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