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-6,10.128.15.223' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 129.994229] [ 129.994592] ============================= [ 129.995465] WARNING: suspicious RCU usage [ 129.996043] 4.13.0-rc6+ #49 Not tainted [ 129.996597] ----------------------------- [ 129.997196] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 129.998244] [ 129.998244] other info that might help us debug this: [ 129.998244] [ 129.999360] [ 129.999360] rcu_scheduler_active = 2, debug_locks = 1 [ 130.000367] no locks held by syzkaller880931/3391. [ 130.001042] [ 130.001042] stack backtrace: [ 130.001658] CPU: 1 PID: 3391 Comm: syzkaller880931 Not tainted 4.13.0-rc6+ #49 [ 130.002620] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 130.003840] Call Trace: [ 130.004266] dump_stack+0x194/0x257 [ 130.004759] ? arch_local_irq_restore+0x53/0x53 [ 130.005408] lockdep_rcu_suspicious+0x123/0x170 [ 130.006052] kvm_dev_ioctl+0x877/0x1840 [ 130.006601] ? lock_downgrade+0x990/0x990 [ 130.007163] ? install_new_memslots+0x420/0x420 [ 130.007798] ? avc_has_extended_perms+0x7fa/0x12c0 [ 130.008453] ? find_held_lock+0x35/0x1d0 [ 130.009007] ? avc_ss_reset+0x110/0x110 [ 130.009539] ? lock_downgrade+0x990/0x990 [ 130.010096] ? lock_release+0xa40/0xa40 [ 130.010632] ? __lock_is_held+0xb6/0x140 [ 130.011201] ? check_same_owner+0x320/0x320 [ 130.011792] ? install_new_memslots+0x420/0x420 [ 130.012418] do_vfs_ioctl+0x1b1/0x1520 [ 130.012946] ? ioctl_preallocate+0x2b0/0x2b0 [ 130.013538] ? selinux_capable+0x40/0x40 [ 130.014082] ? lock_release+0x1d1/0xa40 [ 130.016024] ? syscall_return_slowpath+0x22f/0x450 [ 130.020930] ? security_file_ioctl+0x7d/0xb0 [ 130.025306] ? security_file_ioctl+0x89/0xb0 [ 130.029696] SyS_ioctl+0x8f/0xc0 [ 130.033036] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 130.037761] RIP: 0033:0x44b449 [ 130.040926] RSP: 002b:00007fcbf3759dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 130.048626] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044b449 [ 130.055869] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000005 [ 130.063112] RBP: 0000000000000086 R08: 00007fcbf375a700 R09: 00007fcbf375a700 [ 130.070356] R10: 00007fcbf375a700 R11: 0000000000000202 R12: 0000000000000000 [ 130.077624] R13: 00007ffda4c67aaf R14: 00007fcbf375a9c0 R15: 0000000000000000 [ 130.084946] [ 130.087034] ============================= [ 130.091185] WARNING: suspicious RCU usage [ 130.095321] 4.13.0-rc6+ #49 Not tainted [ 130.099293] ----------------------------- [ 130.103430] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 130.111301] [ 130.111301] other info that might help us debug this: [ 130.111301] [ 130.119440] [ 130.119440] rcu_scheduler_active = 2, debug_locks = 1 [ 130.126107] no locks held by syzkaller880931/3391. [ 130.131021] [ 130.131021] stack backtrace: [ 130.135516] CPU: 1 PID: 3391 Comm: syzkaller880931 Not tainted 4.13.0-rc6+ #49 [ 130.142848] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 130.152183] Call Trace: [ 130.154742] dump_stack+0x194/0x257 [ 130.158339] ? arch_local_irq_restore+0x53/0x53 [ 130.162988] lockdep_rcu_suspicious+0x123/0x170 [ 130.167631] kvm_dev_ioctl+0xd21/0x1840 [ 130.171580] ? lock_downgrade+0x990/0x990 [ 130.175708] ? install_new_memslots+0x420/0x420 [ 130.180361] ? avc_has_extended_perms+0x7fa/0x12c0 [ 130.185263] ? find_held_lock+0x35/0x1d0 [ 130.189310] ? avc_ss_reset+0x110/0x110 [ 130.193259] ? lock_downgrade+0x990/0x990 [ 130.197380] ? lock_release+0xa40/0xa40 [ 130.201333] ? __lock_is_held+0xb6/0x140 [ 130.205391] ? check_same_owner+0x320/0x320 [ 130.209699] ? install_new_memslots+0x420/0x420 [ 130.214343] do_vfs_ioctl+0x1b1/0x1520 [ 130.218211] ? ioctl_preallocate+0x2b0/0x2b0 [ 130.222599] ? selinux_capable+0x40/0x40 [ 130.226634] ? lock_release+0x1d1/0xa40 [ 130.230587] ? syscall_return_slowpath+0x22f/0x450 [ 130.235511] ? security_file_ioctl+0x7d/0xb0 [ 130.239913] ? security_file_ioctl+0x89/0xb0 [ 130.244296] SyS_ioctl+0x8f/0xc0 [ 130.247635] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 130.252356] RIP: 0033:0x44b449 [ 130.255511] RSP: 002b:00007fcbf3759dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 130.263188] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044b449 [ 130.270427] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000005 [ 130.277667] RBP: 0000000000000086 R08: 00007fcbf375a700 R09: 00007fcbf375a700 [ 130.284904] R10: 00007fcbf375a700 R11: 0000000000000202 R12: 0000000000000000 executing program [ 130.292145] R13: 00007ffda4c67aaf R14: 00007fcbf375a9c0 R15: 0000000000000000 executing program executing program executing program executing program executing program executing program