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-1,10.128.0.18' (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 syzkaller login: [ 31.301343] [ 31.316352] ============================= [ 31.333080] WARNING: suspicious RCU usage [ 31.340086] 4.13.0-mm1+ #7 Not tainted executing program executing program executing program executing program executing program executing program [ 31.366168] ----------------------------- [ 31.371383] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 31.381163] [ 31.381163] other info that might help us debug this: [ 31.381163] [ 31.399088] [ 31.399088] rcu_scheduler_active = 2, debug_locks = 1 executing program executing program [ 31.442576] no locks held by syzkaller013810/3490. executing program [ 31.464747] [ 31.464747] stack backtrace: [ 31.472823] CPU: 1 PID: 3490 Comm: syzkaller013810 Not tainted 4.13.0-mm1+ #7 [ 31.480080] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.489403] Call Trace: [ 31.491965] dump_stack+0x194/0x257 [ 31.495568] ? arch_local_irq_restore+0x53/0x53 [ 31.500222] lockdep_rcu_suspicious+0x123/0x170 [ 31.504869] kvm_dev_ioctl+0x877/0x1840 [ 31.508823] ? install_new_memslots+0x420/0x420 [ 31.513479] ? avc_has_extended_perms+0x7fa/0x12c0 [ 31.518378] ? lock_downgrade+0x990/0x990 [ 31.522505] ? avc_ss_reset+0x110/0x110 [ 31.526454] ? lock_release+0xd70/0xd70 [ 31.530402] ? __lock_is_held+0xbc/0x140 [ 31.534459] ? check_same_owner+0x320/0x320 [ 31.538767] ? __lock_is_held+0xbc/0x140 [ 31.542811] ? install_new_memslots+0x420/0x420 [ 31.547453] do_vfs_ioctl+0x1b1/0x1530 [ 31.551317] ? ioctl_preallocate+0x2b0/0x2b0 [ 31.555700] ? selinux_capable+0x40/0x40 [ 31.559735] ? __lock_acquire+0x1651/0x4620 [ 31.564031] ? lockdep_invariant_state+0xdb/0x120 [ 31.568849] ? syscall_return_slowpath+0x2b3/0x500 [ 31.573747] ? finish_task_switch+0x1aa/0x740 [ 31.578219] ? security_file_ioctl+0x7d/0xb0 [ 31.582594] ? security_file_ioctl+0x89/0xb0 [ 31.586978] SyS_ioctl+0x8f/0xc0 [ 31.590321] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 31.595047] RIP: 0033:0x449089 [ 31.598210] RSP: 002b:00007fd38cc5adc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 31.605891] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000449089 executing program executing program [ 31.613535] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 [ 31.620785] RBP: 0000000000000082 R08: 00007fd38cc5b700 R09: 00007fd38cc5b700 [ 31.628026] R10: 00007fd38cc5b700 R11: 0000000000000246 R12: 0000000000000000 [ 31.635266] R13: 00007ffdd1f4eecf R14: 00007fd38cc5b9c0 R15: 0000000000000000 [ 31.642704] [ 31.644325] ============================= [ 31.649210] WARNING: suspicious RCU usage [ 31.657538] 4.13.0-mm1+ #7 Not tainted executing program executing program executing program executing program executing program executing program [ 31.665256] ----------------------------- [ 31.672288] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 31.690215] [ 31.690215] other info that might help us debug this: [ 31.690215] [ 31.708981] [ 31.708981] rcu_scheduler_active = 2, debug_locks = 1 executing program executing program executing program executing program executing program [ 31.728083] no locks held by syzkaller013810/3490. [ 31.741747] [ 31.741747] stack backtrace: [ 31.746757] CPU: 1 PID: 3490 Comm: syzkaller013810 Not tainted 4.13.0-mm1+ #7 [ 31.754008] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.763332] Call Trace: [ 31.765893] dump_stack+0x194/0x257 [ 31.769497] ? arch_local_irq_restore+0x53/0x53 [ 31.774150] lockdep_rcu_suspicious+0x123/0x170 [ 31.778803] kvm_dev_ioctl+0xd21/0x1840 [ 31.782759] ? install_new_memslots+0x420/0x420 [ 31.787414] ? avc_has_extended_perms+0x7fa/0x12c0 [ 31.792313] ? lock_downgrade+0x990/0x990 [ 31.796442] ? avc_ss_reset+0x110/0x110 [ 31.800392] ? lock_release+0xd70/0xd70 [ 31.804343] ? __lock_is_held+0xbc/0x140 [ 31.808400] ? check_same_owner+0x320/0x320 [ 31.812690] ? __lock_is_held+0xbc/0x140 [ 31.816735] ? install_new_memslots+0x420/0x420 [ 31.821375] do_vfs_ioctl+0x1b1/0x1530 executing program executing program executing program [ 31.825239] ? ioctl_preallocate+0x2b0/0x2b0 [ 31.829623] ? selinux_capable+0x40/0x40 [ 31.833657] ? __lock_acquire+0x1651/0x4620 [ 31.837954] ? lockdep_invariant_state+0xdb/0x120 [ 31.842769] ? syscall_return_slowpath+0x2b3/0x500 [ 31.847667] ? finish_task_switch+0x1aa/0x740 [ 31.852140] ? security_file_ioctl+0x7d/0xb0 [ 31.856520] ? security_file_ioctl+0x89/0xb0 [ 31.860904] SyS_ioctl+0x8f/0xc0 [ 31.864247] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 31.868985] RIP: 0033:0x449089 executing program executing program executing program executing program executing program executing program [ 31.872145] RSP: 002b:00007fd38cc5adc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 31.879825] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000449089 [ 31.887065] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 [ 31.894306] RBP: 0000000000000082 R08: 00007fd38cc5b700 R09: 00007fd38cc5b700 [ 31.901548] R10: 00007fd38cc5b700 R11: 0000000000000246 R12: 0000000000000000 [ 31.908792] R13: 00007ffdd1f4eecf R14: 00007fd38cc5b9c0 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