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-2,10.128.0.60' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 37.593936] [ 37.594318] ============================= [ 37.594897] WARNING: suspicious RCU usage [ 37.595660] 4.13.0-rc5+ #43 Not tainted [ 37.596229] ----------------------------- [ 37.596785] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 37.598223] [ 37.598223] other info that might help us debug this: [ 37.598223] [ 37.599430] [ 37.599430] rcu_scheduler_active = 2, debug_locks = 1 [ 37.600422] no locks held by syzkaller690157/3557. [ 37.601105] [ 37.601105] stack backtrace: [ 37.601750] CPU: 1 PID: 3557 Comm: syzkaller690157 Not tainted 4.13.0-rc5+ #43 [ 37.602739] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.604012] Call Trace: [ 37.604370] dump_stack+0x194/0x257 [ 37.604931] ? arch_local_irq_restore+0x53/0x53 [ 37.605563] lockdep_rcu_suspicious+0x123/0x170 [ 37.606189] kvm_dev_ioctl+0x877/0x1840 [ 37.606721] ? lock_downgrade+0x990/0x990 [ 37.607284] ? install_new_memslots+0x420/0x420 [ 37.607917] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 37.608560] ? avc_has_extended_perms+0x7fa/0x12c0 [ 37.609230] ? find_held_lock+0x35/0x1d0 [ 37.609784] ? avc_ss_reset+0x110/0x110 [ 37.610314] ? lock_downgrade+0x990/0x990 [ 37.610943] ? lock_release+0xa40/0xa40 [ 37.611502] ? __lock_is_held+0xb6/0x140 [ 37.612069] ? check_same_owner+0x320/0x320 [ 37.612657] ? install_new_memslots+0x420/0x420 [ 37.613278] do_vfs_ioctl+0x1b1/0x1520 [ 37.613820] ? ioctl_preallocate+0x2b0/0x2b0 [ 37.616479] ? selinux_capable+0x40/0x40 [ 37.620510] ? lock_downgrade+0x811/0x990 [ 37.624630] ? syscall_return_slowpath+0x22f/0x450 [ 37.629533] ? security_file_ioctl+0x7d/0xb0 [ 37.633908] ? security_file_ioctl+0x89/0xb0 [ 37.638287] SyS_ioctl+0x8f/0xc0 [ 37.641624] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 37.646343] RIP: 0033:0x44a8e9 [ 37.649498] RSP: 002b:00007f4f80482d08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 37.657173] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044a8e9 [ 37.664418] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 [ 37.671654] RBP: 0000000000000086 R08: 00007f4f80483700 R09: 00007f4f80483700 [ 37.678892] R10: 00007f4f80483700 R11: 0000000000000246 R12: 0000000000000000 [ 37.686131] R13: 00007fffc06ef62f R14: 00007f4f804839c0 R15: 0000000000000000 [ 37.693485] [ 37.695562] ============================= [ 37.699900] WARNING: suspicious RCU usage [ 37.704045] 4.13.0-rc5+ #43 Not tainted [ 37.708042] ----------------------------- [ 37.712198] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 37.720096] [ 37.720096] other info that might help us debug this: [ 37.720096] [ 37.728417] [ 37.728417] rcu_scheduler_active = 2, debug_locks = 1 [ 37.735095] no locks held by syzkaller690157/3557. [ 37.740016] [ 37.740016] stack backtrace: [ 37.744518] CPU: 1 PID: 3557 Comm: syzkaller690157 Not tainted 4.13.0-rc5+ #43 [ 37.751847] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.761170] Call Trace: [ 37.763730] dump_stack+0x194/0x257 [ 37.767333] ? arch_local_irq_restore+0x53/0x53 [ 37.771981] lockdep_rcu_suspicious+0x123/0x170 [ 37.776622] kvm_dev_ioctl+0xd21/0x1840 [ 37.780569] ? lock_downgrade+0x990/0x990 [ 37.784692] ? install_new_memslots+0x420/0x420 [ 37.789330] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 37.794062] ? avc_has_extended_perms+0x7fa/0x12c0 [ 37.798955] ? find_held_lock+0x35/0x1d0 [ 37.802995] ? avc_ss_reset+0x110/0x110 [ 37.806943] ? lock_downgrade+0x990/0x990 [ 37.811068] ? lock_release+0xa40/0xa40 [ 37.815019] ? __lock_is_held+0xb6/0x140 [ 37.819079] ? check_same_owner+0x320/0x320 [ 37.823397] ? install_new_memslots+0x420/0x420 [ 37.828041] do_vfs_ioctl+0x1b1/0x1520 [ 37.831903] ? ioctl_preallocate+0x2b0/0x2b0 [ 37.836286] ? selinux_capable+0x40/0x40 [ 37.840317] ? lock_downgrade+0x811/0x990 [ 37.844438] ? syscall_return_slowpath+0x22f/0x450 [ 37.849347] ? security_file_ioctl+0x7d/0xb0 [ 37.853730] ? security_file_ioctl+0x89/0xb0 [ 37.858119] SyS_ioctl+0x8f/0xc0 [ 37.861458] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 37.866179] RIP: 0033:0x44a8e9 [ 37.869335] RSP: 002b:00007f4f80482d08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 37.877009] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044a8e9 [ 37.884246] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 executing program [ 37.891486] RBP: 0000000000000086 R08: 00007f4f80483700 R09: 00007f4f80483700 [ 37.898723] R10: 00007f4f80483700 R11: 0000000000000246 R12: 0000000000000000 [ 37.905974] R13: 00007fffc06ef62f R14: 00007f4f804839c0 R15: 0000000000000000 executing program executing program executing program executing program executing program executing program executing program executing program executing program