serialport: Connected to syzkaller.us-central1-c.ci-upstream-kasan-gce-4 port 1 (session ID: 649639f35226a7a438d0d37460bbd8eb7ddcb004eddd97cc21fd68b1038a23fc, active connections: 1).
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-4,10.128.0.44' (ECDSA) to the list of known hosts.
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syzkaller login: [   39.519248] 
[   39.519586] =============================
[   39.520446] WARNING: suspicious RCU usage
[   39.521071] 4.13.0-rc4+ #24 Not tainted
[   39.521658] -----------------------------
[   39.522253] ./include/linux/kvm_host.h:481 suspicious rcu_dereference_check() usage!
[   39.523299] 
[   39.523299] other info that might help us debug this:
[   39.523299] 
[   39.524388] 
[   39.524388] rcu_scheduler_active = 2, debug_locks = 1
[   39.525277] no locks held by syzkaller906385/3557.
[   39.525932] 
[   39.525932] stack backtrace:
[   39.526554] CPU: 1 PID: 3557 Comm: syzkaller906385 Not tainted 4.13.0-rc4+ #24
[   39.527593] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   39.528814] Call Trace:
[   39.529177]  dump_stack+0x194/0x257
[   39.529668]  ? arch_local_irq_restore+0x53/0x53
[   39.530304]  lockdep_rcu_suspicious+0x123/0x170
[   39.530933]  kvm_dev_ioctl+0x877/0x1840
[   39.531464]  ? lock_downgrade+0x990/0x990
[   39.532028]  ? install_new_memslots+0x420/0x420
[   39.532675]  ? avc_has_extended_perms+0x7fa/0x12c0
[   39.533332]  ? find_held_lock+0x35/0x1d0
[   39.533896]  ? avc_ss_reset+0x110/0x110
[   39.534471]  ? lock_downgrade+0x990/0x990
[   39.535031]  ? lock_release+0xa40/0xa40
[   39.535568]  ? __lock_is_held+0xb6/0x140
[   39.536136]  ? check_same_owner+0x320/0x320
[   39.536726]  ? install_new_memslots+0x420/0x420
[   39.537374]  do_vfs_ioctl+0x1b1/0x1520
[   39.537903]  ? ioctl_preallocate+0x2b0/0x2b0
[   39.538498]  ? selinux_capable+0x40/0x40
[   39.539042]  ? lock_acquire+0x251/0x580
[   39.540966]  ? syscall_return_slowpath+0x22f/0x450
[   39.545875]  ? security_file_ioctl+0x7d/0xb0
[   39.550253]  ? security_file_ioctl+0x89/0xb0
[   39.554636]  SyS_ioctl+0x8f/0xc0
[   39.557980]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   39.562705] RIP: 0033:0x446d59
[   39.565868] RSP: 002b:00007f6615324d08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   39.573544] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446d59
[   39.580780] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000005
[   39.588016] RBP: 0000000000000086 R08: 00007f6615325700 R09: 00007f6615325700
[   39.595252] R10: 00007f6615325700 R11: 0000000000000246 R12: 0000000000000000
[   39.602487] R13: 00007ffd93bf8e8f R14: 00007f66153259c0 R15: 0000000000000000
[   39.609821] 
[   39.611887] =============================
[   39.616037] WARNING: suspicious RCU usage
[   39.620177] 4.13.0-rc4+ #24 Not tainted
[   39.624141] -----------------------------
[   39.628276] ./include/linux/kvm_host.h:575 suspicious rcu_dereference_check() usage!
[   39.636151] 
[   39.636151] other info that might help us debug this:
[   39.636151] 
[   39.644290] 
[   39.644290] rcu_scheduler_active = 2, debug_locks = 1
[   39.650957] no locks held by syzkaller906385/3557.
[   39.655880] 
[   39.655880] stack backtrace:
[   39.660386] CPU: 1 PID: 3557 Comm: syzkaller906385 Not tainted 4.13.0-rc4+ #24
[   39.667710] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   39.677032] Call Trace:
[   39.679598]  dump_stack+0x194/0x257
[   39.683197]  ? arch_local_irq_restore+0x53/0x53
[   39.687847]  lockdep_rcu_suspicious+0x123/0x170
[   39.692489]  kvm_dev_ioctl+0xd21/0x1840
[   39.696430]  ? lock_downgrade+0x990/0x990
[   39.700552]  ? install_new_memslots+0x420/0x420
[   39.705201]  ? avc_has_extended_perms+0x7fa/0x12c0
[   39.710101]  ? find_held_lock+0x35/0x1d0
[   39.714139]  ? avc_ss_reset+0x110/0x110
[   39.718079]  ? lock_downgrade+0x990/0x990
[   39.722199]  ? lock_release+0xa40/0xa40
[   39.726151]  ? __lock_is_held+0xb6/0x140
[   39.730212]  ? check_same_owner+0x320/0x320
[   39.734519]  ? install_new_memslots+0x420/0x420
[   39.739156]  do_vfs_ioctl+0x1b1/0x1520
[   39.743017]  ? ioctl_preallocate+0x2b0/0x2b0
[   39.747397]  ? selinux_capable+0x40/0x40
[   39.751427]  ? lock_acquire+0x251/0x580
[   39.755377]  ? syscall_return_slowpath+0x22f/0x450
[   39.760284]  ? security_file_ioctl+0x7d/0xb0
[   39.764656]  ? security_file_ioctl+0x89/0xb0
[   39.769035]  SyS_ioctl+0x8f/0xc0
[   39.772374]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   39.777100] RIP: 0033:0x446d59
[   39.780258] RSP: 002b:00007f6615324d08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   39.787933] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446d59
[   39.795170] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000005
[   39.802407] RBP: 0000000000000086 R08: 00007f6615325700 R09: 00007f6615325700
[   39.809643] R10: 00007f6615325700 R11: 0000000000000246 R12: 0000000000000000
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[   39.816880] R13: 00007ffd93bf8e8f R14: 00007f66153259c0 R15: 0000000000000000
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