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-0,10.128.15.216' (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 syzkaller login: [ 50.423719] [ 50.424755] ============================= [ 50.431085] WARNING: suspicious RCU usage [ 50.439817] 4.13.0-rc7+ #59 Not tainted [ 50.442659] ----------------------------- [ 50.445466] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! executing program [ 50.475727] [ 50.475727] other info that might help us debug this: [ 50.475727] [ 50.492903] [ 50.492903] rcu_scheduler_active = 2, debug_locks = 1 [ 50.500890] no locks held by syzkaller260524/5280. [ 50.506916] [ 50.506916] stack backtrace: [ 50.512331] CPU: 1 PID: 5280 Comm: syzkaller260524 Not tainted 4.13.0-rc7+ #59 executing program executing program [ 50.519696] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.529058] Call Trace: [ 50.531648] dump_stack+0x194/0x257 [ 50.535287] ? arch_local_irq_restore+0x53/0x53 [ 50.539987] lockdep_rcu_suspicious+0x123/0x170 [ 50.544686] kvm_dev_ioctl+0x877/0x1840 [ 50.548683] ? lock_downgrade+0x990/0x990 [ 50.552848] ? install_new_memslots+0x420/0x420 [ 50.557557] ? avc_has_extended_perms+0x7fa/0x12c0 [ 50.562491] ? find_held_lock+0x35/0x1d0 [ 50.566687] ? avc_ss_reset+0x110/0x110 [ 50.570663] ? lock_downgrade+0x990/0x990 [ 50.574940] ? lock_release+0xa40/0xa40 [ 50.578927] ? __lock_is_held+0xb6/0x140 [ 50.583135] ? check_same_owner+0x320/0x320 [ 50.587482] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 50.592613] ? install_new_memslots+0x420/0x420 [ 50.597292] do_vfs_ioctl+0x1b1/0x1520 [ 50.601205] ? ioctl_preallocate+0x2b0/0x2b0 [ 50.605751] ? selinux_capable+0x40/0x40 [ 50.609839] ? syscall_return_slowpath+0x22f/0x450 [ 50.614799] ? security_file_ioctl+0x7d/0xb0 [ 50.619226] ? security_file_ioctl+0x89/0xb0 [ 50.623714] SyS_ioctl+0x8f/0xc0 [ 50.627097] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 50.631853] RIP: 0033:0x446239 [ 50.635063] RSP: 002b:00007fecc4e5edc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 50.642807] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446239 [ 50.650083] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 [ 50.657442] RBP: 0000000000000086 R08: 00007fecc4e5f700 R09: 00007fecc4e5f700 [ 50.664722] R10: 00007fecc4e5f700 R11: 0000000000000246 R12: 0000000000000000 executing program executing program executing program executing program executing program [ 50.672183] R13: 00007ffcc964236f R14: 00007fecc4e5f9c0 R15: 0000000000000000 [ 50.679643] [ 50.687237] ============================= [ 50.694239] WARNING: suspicious RCU usage [ 50.706756] 4.13.0-rc7+ #59 Not tainted [ 50.714606] ----------------------------- executing program executing program [ 50.722920] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 50.732548] [ 50.732548] other info that might help us debug this: [ 50.732548] [ 50.746054] [ 50.746054] rcu_scheduler_active = 2, debug_locks = 1 [ 50.757780] no locks held by syzkaller260524/5280. [ 50.766108] [ 50.766108] stack backtrace: executing program executing program [ 50.773569] CPU: 1 PID: 5280 Comm: syzkaller260524 Not tainted 4.13.0-rc7+ #59 [ 50.780958] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.790404] Call Trace: [ 50.792990] dump_stack+0x194/0x257 [ 50.796641] ? arch_local_irq_restore+0x53/0x53 [ 50.801370] lockdep_rcu_suspicious+0x123/0x170 [ 50.806054] kvm_dev_ioctl+0xd21/0x1840 [ 50.810033] ? lock_downgrade+0x990/0x990 [ 50.814203] ? install_new_memslots+0x420/0x420 [ 50.818904] ? avc_has_extended_perms+0x7fa/0x12c0 executing program [ 50.823845] ? find_held_lock+0x35/0x1d0 [ 50.828284] ? avc_ss_reset+0x110/0x110 [ 50.832263] ? lock_downgrade+0x990/0x990 [ 50.836424] ? lock_release+0xa40/0xa40 [ 50.840407] ? __lock_is_held+0xb6/0x140 [ 50.844507] ? check_same_owner+0x320/0x320 [ 50.848838] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 50.853962] ? install_new_memslots+0x420/0x420 [ 50.858646] do_vfs_ioctl+0x1b1/0x1520 [ 50.862548] ? ioctl_preallocate+0x2b0/0x2b0 [ 50.866986] ? selinux_capable+0x40/0x40 [ 50.871069] ? syscall_return_slowpath+0x22f/0x450 executing program [ 50.876020] ? security_file_ioctl+0x7d/0xb0 [ 50.880434] ? security_file_ioctl+0x89/0xb0 [ 50.884853] SyS_ioctl+0x8f/0xc0 [ 50.888415] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 50.893168] RIP: 0033:0x446239 [ 50.896354] RSP: 002b:00007fecc4e5edc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 50.904062] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446239 [ 50.911328] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 [ 50.918595] RBP: 0000000000000086 R08: 00007fecc4e5f700 R09: 00007fecc4e5f700 executing program executing program executing program executing program executing program executing program executing program [ 50.925864] R10: 00007fecc4e5f700 R11: 0000000000000246 R12: 0000000000000000 [ 50.933133] R13: 00007ffcc964236f R14: 00007fecc4e5f9c0 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