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-0,10.128.15.194' (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 program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 61.626079] [ 61.626506] ============================= [ 61.630353] WARNING: suspicious RCU usage [ 61.632499] 4.13.0-rc6+ #54 Not tainted [ 61.634001] ----------------------------- [ 61.635947] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 61.637655] [ 61.637655] other info that might help us debug this: [ 61.637655] [ 61.640091] [ 61.640091] rcu_scheduler_active = 2, debug_locks = 1 [ 61.647873] no locks held by syzkaller976809/10692. [ 61.662805] [ 61.662805] stack backtrace: executing program executing program [ 61.680923] CPU: 0 PID: 10692 Comm: syzkaller976809 Not tainted 4.13.0-rc6+ #54 [ 61.688389] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.697902] Call Trace: [ 61.700483] dump_stack+0x194/0x257 [ 61.704102] ? arch_local_irq_restore+0x53/0x53 [ 61.708779] lockdep_rcu_suspicious+0x123/0x170 [ 61.713446] kvm_dev_ioctl+0x877/0x1840 [ 61.717422] ? lock_downgrade+0x990/0x990 [ 61.721574] ? install_new_memslots+0x420/0x420 [ 61.726266] ? avc_has_extended_perms+0x7fa/0x12c0 [ 61.731181] ? find_held_lock+0x35/0x1d0 [ 61.735248] ? avc_ss_reset+0x110/0x110 [ 61.739211] ? lock_downgrade+0x990/0x990 [ 61.743358] ? lock_release+0xa40/0xa40 [ 61.747328] ? __lock_is_held+0xb6/0x140 [ 61.751420] ? check_same_owner+0x320/0x320 [ 61.755751] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 61.760889] ? install_new_memslots+0x420/0x420 [ 61.765553] do_vfs_ioctl+0x1b1/0x1520 [ 61.769460] ? ioctl_preallocate+0x2b0/0x2b0 [ 61.773876] ? selinux_capable+0x40/0x40 [ 61.777961] ? syscall_return_slowpath+0x22f/0x450 [ 61.782895] ? security_file_ioctl+0x7d/0xb0 [ 61.787286] ? security_file_ioctl+0x89/0xb0 [ 61.791685] SyS_ioctl+0x8f/0xc0 [ 61.795048] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 61.799785] RIP: 0033:0x446539 [ 61.802957] RSP: 002b:00007f3350a5cd98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 61.810647] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446539 [ 61.817914] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 executing program executing program executing program [ 61.825179] RBP: 0000000000000086 R08: 00007f3350a5d700 R09: 0000000000000000 [ 61.832429] R10: 00007f3350a5d700 R11: 0000000000000246 R12: 0000000000000000 [ 61.839681] R13: 00007ffcc170047f R14: 00007f3350a5d9c0 R15: 0000000000000000 [ 61.847253] [ 61.860068] ============================= [ 61.866371] WARNING: suspicious RCU usage [ 61.875934] 4.13.0-rc6+ #54 Not tainted executing program executing program [ 61.880492] ----------------------------- [ 61.886421] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 61.895137] [ 61.895137] other info that might help us debug this: [ 61.895137] [ 61.905244] [ 61.905244] rcu_scheduler_active = 2, debug_locks = 1 [ 61.915215] no locks held by syzkaller976809/10692. [ 61.922177] [ 61.922177] stack backtrace: [ 61.930951] CPU: 0 PID: 10692 Comm: syzkaller976809 Not tainted 4.13.0-rc6+ #54 [ 61.938394] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.947735] Call Trace: [ 61.950312] dump_stack+0x194/0x257 [ 61.953935] ? arch_local_irq_restore+0x53/0x53 [ 61.958618] lockdep_rcu_suspicious+0x123/0x170 [ 61.963277] kvm_dev_ioctl+0xd21/0x1840 [ 61.967263] ? lock_downgrade+0x990/0x990 [ 61.971431] ? install_new_memslots+0x420/0x420 [ 61.976110] ? avc_has_extended_perms+0x7fa/0x12c0 [ 61.981048] ? find_held_lock+0x35/0x1d0 [ 61.985115] ? avc_ss_reset+0x110/0x110 [ 61.989078] ? lock_downgrade+0x990/0x990 [ 61.993220] ? lock_release+0xa40/0xa40 [ 61.997184] ? __lock_is_held+0xb6/0x140 [ 62.001285] ? check_same_owner+0x320/0x320 [ 62.005624] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 62.010735] ? install_new_memslots+0x420/0x420 [ 62.015413] do_vfs_ioctl+0x1b1/0x1520 [ 62.019303] ? ioctl_preallocate+0x2b0/0x2b0 [ 62.023713] ? selinux_capable+0x40/0x40 [ 62.027780] ? syscall_return_slowpath+0x22f/0x450 [ 62.032718] ? security_file_ioctl+0x7d/0xb0 [ 62.037142] ? security_file_ioctl+0x89/0xb0 [ 62.041577] SyS_ioctl+0x8f/0xc0 [ 62.044965] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 62.049707] RIP: 0033:0x446539 [ 62.052895] RSP: 002b:00007f3350a5cd98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 62.060598] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446539 [ 62.067853] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 62.075536] RBP: 0000000000000086 R08: 00007f3350a5d700 R09: 0000000000000000 executing program executing program executing program executing program executing program executing program [ 62.082790] R10: 00007f3350a5d700 R11: 0000000000000246 R12: 0000000000000000 [ 62.090042] R13: 00007ffcc170047f R14: 00007f3350a5d9c0 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