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-7,10.128.0.51' (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 syzkaller login: [ 60.298387] [ 60.298774] ============================= [ 60.300075] WARNING: suspicious RCU usage [ 60.300673] 4.13.0-rc6+ #44 Not tainted executing program executing program [ 60.331224] ----------------------------- executing program executing program [ 60.375845] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! executing program executing program executing program [ 60.434085] [ 60.434085] other info that might help us debug this: [ 60.434085] executing program executing program executing program [ 60.478532] [ 60.478532] rcu_scheduler_active = 2, debug_locks = 1 executing program executing program [ 60.528490] no locks held by syzkaller820885/6643. executing program executing program executing program executing program [ 60.569730] [ 60.569730] stack backtrace: [ 60.601155] CPU: 0 PID: 6643 Comm: syzkaller820885 Not tainted 4.13.0-rc6+ #44 [ 60.608540] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.617877] Call Trace: [ 60.620455] dump_stack+0x194/0x257 [ 60.622790] [ 60.622793] ============================= [ 60.622795] WARNING: suspicious RCU usage [ 60.622800] 4.13.0-rc6+ #44 Not tainted [ 60.622802] ----------------------------- [ 60.622807] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 60.622810] [ 60.622810] other info that might help us debug this: [ 60.622810] [ 60.622814] [ 60.622814] rcu_scheduler_active = 2, debug_locks = 1 [ 60.622817] no locks held by syzkaller820885/6887. [ 60.622820] [ 60.622820] stack backtrace: [ 60.673932] ? arch_local_irq_restore+0x53/0x53 [ 60.678614] lockdep_rcu_suspicious+0x123/0x170 [ 60.683270] kvm_dev_ioctl+0x877/0x1840 [ 60.687222] ? lock_downgrade+0x990/0x990 [ 60.691373] ? install_new_memslots+0x420/0x420 [ 60.696051] ? avc_has_extended_perms+0x7fa/0x12c0 [ 60.700964] ? find_held_lock+0x35/0x1d0 [ 60.705030] ? avc_ss_reset+0x110/0x110 [ 60.708983] ? lock_downgrade+0x990/0x990 [ 60.713123] ? lock_release+0xa40/0xa40 [ 60.717173] ? __lock_is_held+0xb6/0x140 [ 60.721267] ? check_same_owner+0x320/0x320 [ 60.725612] ? install_new_memslots+0x420/0x420 [ 60.730262] do_vfs_ioctl+0x1b1/0x1520 [ 60.734159] ? ioctl_preallocate+0x2b0/0x2b0 [ 60.738556] ? selinux_capable+0x40/0x40 [ 60.742599] ? lock_downgrade+0x811/0x990 [ 60.746742] ? syscall_return_slowpath+0x22f/0x450 [ 60.751667] ? security_file_ioctl+0x7d/0xb0 [ 60.756099] ? security_file_ioctl+0x89/0xb0 [ 60.760504] SyS_ioctl+0x8f/0xc0 [ 60.763868] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 60.768696] RIP: 0033:0x446329 [ 60.771865] RSP: 002b:00007fa6bfa30dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 60.779559] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446329 [ 60.786812] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 60.794062] RBP: 0000000000000086 R08: 00007fa6bfa31700 R09: 00007fa6bfa31700 [ 60.801315] R10: 00007fa6bfa31700 R11: 0000000000000202 R12: 0000000000000000 [ 60.808569] R13: 00007ffdd675641f R14: 00007fa6bfa319c0 R15: 0000000000000000 [ 60.815857] CPU: 1 PID: 6887 Comm: syzkaller820885 Not tainted 4.13.0-rc6+ #44 [ 60.823233] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.832582] Call Trace: [ 60.835165] dump_stack+0x194/0x257 [ 60.838791] ? arch_local_irq_restore+0x53/0x53 [ 60.843474] lockdep_rcu_suspicious+0x123/0x170 [ 60.848147] kvm_dev_ioctl+0xd21/0x1840 executing program executing program [ 60.852112] ? lock_downgrade+0x990/0x990 [ 60.856267] ? install_new_memslots+0x420/0x420 [ 60.860951] ? avc_has_extended_perms+0x7fa/0x12c0 [ 60.865873] ? find_held_lock+0x35/0x1d0 [ 60.869947] ? avc_ss_reset+0x110/0x110 [ 60.873918] ? lock_downgrade+0x990/0x990 [ 60.878068] ? lock_release+0xa40/0xa40 [ 60.882038] ? __lock_is_held+0xb6/0x140 [ 60.886140] ? check_same_owner+0x320/0x320 [ 60.890458] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 60.895567] ? install_new_memslots+0x420/0x420 executing program executing program [ 60.900229] do_vfs_ioctl+0x1b1/0x1520 [ 60.904117] ? ioctl_preallocate+0x2b0/0x2b0 [ 60.908528] ? selinux_capable+0x40/0x40 [ 60.912596] ? syscall_return_slowpath+0x22f/0x450 [ 60.917530] ? security_file_ioctl+0x7d/0xb0 [ 60.921924] ? security_file_ioctl+0x89/0xb0 [ 60.926333] SyS_ioctl+0x8f/0xc0 [ 60.929693] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 60.934431] RIP: 0033:0x446329 [ 60.937608] RSP: 002b:00007fa6bfa30dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [ 60.945301] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446329 executing program [ 60.952558] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 60.959809] RBP: 0000000000000086 R08: 00007fa6bfa31700 R09: 00007fa6bfa31700 [ 60.967058] R10: 00007fa6bfa31700 R11: 0000000000000202 R12: 0000000000000000 [ 60.974305] R13: 00007ffdd675641f R14: 00007fa6bfa319c0 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