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-1,10.128.0.21' (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 syzkaller login: [ 53.279144] [ 53.279524] ============================= [ 53.281479] WARNING: suspicious RCU usage [ 53.283592] 4.13.0-rc7+ #65 Not tainted [ 53.284516] ----------------------------- [ 53.285483] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 53.286747] [ 53.286747] other info that might help us debug this: [ 53.286747] [ 53.288089] [ 53.288089] rcu_scheduler_active = 2, debug_locks = 1 [ 53.289107] no locks held by syzkaller692336/4253. [ 53.289826] [ 53.289826] stack backtrace: [ 53.290558] CPU: 0 PID: 4253 Comm: syzkaller692336 Not tainted 4.13.0-rc7+ #65 [ 53.291546] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.292809] Call Trace: [ 53.293173] dump_stack+0x194/0x257 [ 53.293680] ? arch_local_irq_restore+0x53/0x53 [ 53.294361] lockdep_rcu_suspicious+0x123/0x170 [ 53.294989] kvm_dev_ioctl+0x877/0x1840 [ 53.295524] ? lock_downgrade+0x990/0x990 [ 53.296089] ? install_new_memslots+0x420/0x420 [ 53.296779] ? avc_has_extended_perms+0x7fa/0x12c0 [ 53.297514] ? find_held_lock+0x35/0x1d0 [ 53.298068] ? avc_ss_reset+0x110/0x110 [ 53.298703] ? lock_downgrade+0x990/0x990 [ 53.299464] ? lock_release+0xa40/0xa40 [ 53.303415] ? __lock_is_held+0xb6/0x140 [ 53.307474] ? check_same_owner+0x320/0x320 [ 53.311768] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 53.316854] ? install_new_memslots+0x420/0x420 [ 53.321496] do_vfs_ioctl+0x1b1/0x1520 executing program executing program executing program [ 53.325372] ? ioctl_preallocate+0x2b0/0x2b0 [ 53.329753] ? selinux_capable+0x40/0x40 [ 53.333798] ? syscall_return_slowpath+0x22f/0x450 [ 53.338706] ? security_file_ioctl+0x7d/0xb0 [ 53.343086] ? security_file_ioctl+0x89/0xb0 [ 53.347471] SyS_ioctl+0x8f/0xc0 [ 53.350814] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 53.355539] RIP: 0033:0x4462b9 [ 53.358705] RSP: 002b:00007f631cd60dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 53.366391] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004462b9 executing program executing program executing program executing program executing program [ 53.373632] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 53.380875] RBP: 0000000000000086 R08: 00007f631cd61700 R09: 00007f631cd61700 [ 53.388126] R10: 00007f631cd61700 R11: 0000000000000202 R12: 0000000000000000 [ 53.395368] R13: 00007fff9e440f0f R14: 00007f631cd619c0 R15: 0000000000000000 [ 53.402703] [ 53.412715] ============================= [ 53.417864] WARNING: suspicious RCU usage [ 53.422753] 4.13.0-rc7+ #65 Not tainted executing program executing program executing program [ 53.427136] ----------------------------- [ 53.431713] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 53.440932] [ 53.440932] other info that might help us debug this: [ 53.440932] [ 53.449686] [ 53.449686] rcu_scheduler_active = 2, debug_locks = 1 [ 53.463223] no locks held by syzkaller692336/4253. [ 53.473489] [ 53.473489] stack backtrace: executing program executing program [ 53.478655] CPU: 0 PID: 4253 Comm: syzkaller692336 Not tainted 4.13.0-rc7+ #65 [ 53.485997] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.495319] Call Trace: [ 53.497876] dump_stack+0x194/0x257 [ 53.501479] ? arch_local_irq_restore+0x53/0x53 [ 53.506130] lockdep_rcu_suspicious+0x123/0x170 [ 53.510784] kvm_dev_ioctl+0xd21/0x1840 [ 53.514733] ? lock_downgrade+0x990/0x990 [ 53.518866] ? install_new_memslots+0x420/0x420 [ 53.523521] ? avc_has_extended_perms+0x7fa/0x12c0 executing program [ 53.528434] ? find_held_lock+0x35/0x1d0 [ 53.532474] ? avc_ss_reset+0x110/0x110 [ 53.536415] ? lock_downgrade+0x990/0x990 [ 53.540536] ? lock_release+0xa40/0xa40 [ 53.544486] ? __lock_is_held+0xb6/0x140 [ 53.548550] ? check_same_owner+0x320/0x320 [ 53.552842] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 53.557921] ? install_new_memslots+0x420/0x420 [ 53.562556] do_vfs_ioctl+0x1b1/0x1520 [ 53.566426] ? ioctl_preallocate+0x2b0/0x2b0 [ 53.570811] ? selinux_capable+0x40/0x40 [ 53.574856] ? syscall_return_slowpath+0x22f/0x450 executing program [ 53.579770] ? security_file_ioctl+0x7d/0xb0 [ 53.584146] ? security_file_ioctl+0x89/0xb0 [ 53.588539] SyS_ioctl+0x8f/0xc0 [ 53.591880] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 53.596606] RIP: 0033:0x4462b9 [ 53.599762] RSP: 002b:00007f631cd60dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 53.607437] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004462b9 [ 53.614677] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 53.621916] RBP: 0000000000000086 R08: 00007f631cd61700 R09: 00007f631cd61700 executing program executing program executing program executing program executing program executing program [ 53.629155] R10: 00007f631cd61700 R11: 0000000000000202 R12: 0000000000000000 [ 53.636394] R13: 00007fff9e440f0f R14: 00007f631cd619c0 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