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-4,10.128.0.19' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 254.563950] [ 254.564325] ============================= [ 254.564920] WARNING: suspicious RCU usage [ 254.565783] 4.13.0-rc7+ #63 Not tainted [ 254.566334] ----------------------------- [ 254.566890] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage! [ 254.568421] [ 254.568421] other info that might help us debug this: [ 254.568421] [ 254.569691] [ 254.569691] rcu_scheduler_active = 2, debug_locks = 1 [ 254.570591] no locks held by syzkaller780172/10890. [ 254.571275] [ 254.571275] stack backtrace: [ 254.571924] CPU: 0 PID: 10890 Comm: syzkaller780172 Not tainted 4.13.0-rc7+ #63 [ 254.572898] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 254.574128] Call Trace: [ 254.574485] dump_stack+0x194/0x257 [ 254.574977] ? arch_local_irq_restore+0x53/0x53 [ 254.575610] lockdep_rcu_suspicious+0x123/0x170 [ 254.576287] kvm_dev_ioctl+0x877/0x1840 [ 254.576819] ? lock_downgrade+0x990/0x990 [ 254.577381] ? install_new_memslots+0x420/0x420 [ 254.578042] ? avc_has_extended_perms+0x7fa/0x12c0 [ 254.578698] ? find_held_lock+0x35/0x1d0 [ 254.579253] ? avc_ss_reset+0x110/0x110 [ 254.579782] ? lock_downgrade+0x990/0x990 [ 254.580362] ? lock_release+0xa40/0xa40 [ 254.580898] ? __lock_is_held+0xb6/0x140 [ 254.581478] ? check_same_owner+0x320/0x320 [ 254.582086] ? install_new_memslots+0x420/0x420 [ 254.582707] do_vfs_ioctl+0x1b1/0x1520 [ 254.583236] ? ioctl_preallocate+0x2b0/0x2b0 [ 254.583838] ? selinux_capable+0x40/0x40 [ 254.586372] ? lock_release+0x91/0xa40 [ 254.590244] ? syscall_return_slowpath+0x22f/0x450 [ 254.595149] ? security_file_ioctl+0x7d/0xb0 [ 254.599524] ? security_file_ioctl+0x89/0xb0 [ 254.603904] SyS_ioctl+0x8f/0xc0 [ 254.607251] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 254.611978] RIP: 0033:0x4472e9 [ 254.615136] RSP: 002b:00007f4b7cca0dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 254.622811] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004472e9 [ 254.630057] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 254.637292] RBP: 0000000000000086 R08: 00007f4b7cca1700 R09: 00007f4b7cca1700 [ 254.644527] R10: 00007f4b7cca1700 R11: 0000000000000246 R12: 0000000000000000 [ 254.651762] R13: 00000000007efd8f R14: 00007f4b7cca19c0 R15: 0000000000000000 [ 254.659067] [ 254.660681] ============================= [ 254.664818] WARNING: suspicious RCU usage [ 254.668952] 4.13.0-rc7+ #63 Not tainted [ 254.672912] ----------------------------- [ 254.677045] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage! [ 254.684914] [ 254.684914] other info that might help us debug this: [ 254.684914] [ 254.693047] [ 254.693047] rcu_scheduler_active = 2, debug_locks = 1 [ 254.700192] no locks held by syzkaller780172/10890. [ 254.705206] [ 254.705206] stack backtrace: [ 254.709688] CPU: 0 PID: 10890 Comm: syzkaller780172 Not tainted 4.13.0-rc7+ #63 [ 254.717102] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 254.726424] Call Trace: [ 254.728982] dump_stack+0x194/0x257 [ 254.732579] ? arch_local_irq_restore+0x53/0x53 [ 254.737225] lockdep_rcu_suspicious+0x123/0x170 [ 254.741872] kvm_dev_ioctl+0xd21/0x1840 [ 254.745813] ? lock_downgrade+0x990/0x990 [ 254.749932] ? install_new_memslots+0x420/0x420 [ 254.754582] ? avc_has_extended_perms+0x7fa/0x12c0 [ 254.759477] ? find_held_lock+0x35/0x1d0 [ 254.763516] ? avc_ss_reset+0x110/0x110 [ 254.767467] ? lock_downgrade+0x990/0x990 [ 254.771584] ? lock_release+0xa40/0xa40 [ 254.775527] ? __lock_is_held+0xb6/0x140 [ 254.779580] ? check_same_owner+0x320/0x320 [ 254.783890] ? install_new_memslots+0x420/0x420 [ 254.788529] do_vfs_ioctl+0x1b1/0x1520 [ 254.792388] ? ioctl_preallocate+0x2b0/0x2b0 [ 254.796768] ? selinux_capable+0x40/0x40 [ 254.800802] ? lock_release+0x91/0xa40 [ 254.804665] ? syscall_return_slowpath+0x22f/0x450 [ 254.809583] ? security_file_ioctl+0x7d/0xb0 [ 254.813999] ? security_file_ioctl+0x89/0xb0 [ 254.818379] SyS_ioctl+0x8f/0xc0 [ 254.821719] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 254.826445] RIP: 0033:0x4472e9 [ 254.829603] RSP: 002b:00007f4b7cca0dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 254.837797] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004472e9 [ 254.845035] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003 [ 254.852274] RBP: 0000000000000086 R08: 00007f4b7cca1700 R09: 00007f4b7cca1700 executing program [ 254.859512] R10: 00007f4b7cca1700 R11: 0000000000000246 R12: 0000000000000000 [ 254.866749] R13: 00000000007efd8f R14: 00007f4b7cca19c0 R15: 0000000000000000 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program