[  OK  ] Started OpenBSD Secure Shell server.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.81' (ECDSA) to the list of known hosts.
2021/06/22 19:03:32 fuzzer started
2021/06/22 19:03:32 dialing manager at 10.128.0.163:35769
2021/06/22 19:03:33 syscalls: 1998
2021/06/22 19:03:33 code coverage: enabled
2021/06/22 19:03:33 comparison tracing: enabled
2021/06/22 19:03:33 extra coverage: enabled
2021/06/22 19:03:33 setuid sandbox: enabled
2021/06/22 19:03:33 namespace sandbox: enabled
2021/06/22 19:03:33 Android sandbox: enabled
2021/06/22 19:03:33 fault injection: enabled
2021/06/22 19:03:33 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2021/06/22 19:03:33 net packet injection: /dev/net/tun does not exist
2021/06/22 19:03:33 net device setup: enabled
2021/06/22 19:03:33 concurrency sanitizer: enabled
2021/06/22 19:03:33 devlink PCI setup: PCI device 0000:00:10.0 is not available
2021/06/22 19:03:33 USB emulation: /dev/raw-gadget does not exist
2021/06/22 19:03:33 hci packet injection: /dev/vhci does not exist
2021/06/22 19:03:33 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist
2021/06/22 19:03:33 802.15.4 emulation: /sys/bus/platform/devices/mac802154_hwsim does not exist
2021/06/22 19:03:34 suppressing KCSAN reports in functions: 'ps2_do_sendbyte' 'step_into' '__xa_clear_mark' 'blk_mq_rq_ctx_init' 'shmem_symlink' 'generic_write_end' 'exit_mm' 'lookup_fast' 'ktime_get_real_seconds' 'ext4_free_inodes_count' 'blk_mq_sched_dispatch_requests' 'n_tty_receive_buf_common' 
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syzkaller login: [   25.207436][    T0] ==================================================================
[   25.209041][    T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_timer
[   25.210280][    T0] 
[   25.210727][    T0] write to 0xffffffff83cbf1d0 of 4 bytes by interrupt on cpu 1:
[   25.211843][    T0]  tick_sched_timer+0x1f5/0x210
[   25.212574][    T0]  __run_hrtimer+0x160/0x480
[   25.213607][    T0]  hrtimer_interrupt+0x380/0xaf0
[   25.214482][    T0]  __sysvec_apic_timer_interrupt+0x6f/0x1c0
[   25.215376][    T0]  sysvec_apic_timer_interrupt+0x2d/0x80
[   25.216231][    T0]  asm_sysvec_apic_timer_interrupt+0x12/0x20
[   25.217083][    T0] 
[   25.217417][    T0] read to 0xffffffff83cbf1d0 of 4 bytes by task 0 on cpu 0:
[   25.218508][    T0]  tick_nohz_next_event+0x217/0x300
[   25.219336][    T0]  tick_nohz_get_sleep_length+0x121/0x280
[   25.220476][    T0]  menu_select+0x303/0x1050
[   25.221147][    T0]  cpuidle_select+0x3d/0x50
[   25.221845][    T0]  do_idle+0x16f/0x240
[   25.222491][    T0]  cpu_startup_entry+0x15/0x20
[   25.223258][    T0]  rest_init+0xc9/0xd0
[   25.223922][    T0]  arch_call_rest_init+0xa/0xb
[   25.224775][    T0]  start_kernel+0x59e/0x623
[   25.225506][    T0]  secondary_startup_64_no_verify+0xb0/0xbb
[   25.226321][    T0] 
[   25.226710][    T0] value changed: 0xffffffff -> 0x00000001
[   25.227579][    T0] 
[   25.229899][    T0] Reported by Kernel Concurrency Sanitizer on:
[   25.236026][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.13.0-rc7-syzkaller #0
[   25.243976][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
2021/06/22 19:03:39 fetching corpus: 4587, signal 148636/193149 (executing program)
[   25.254021][    T0] ==================================================================
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2021/06/22 19:03:47 starting 6 fuzzer processes
19:03:47 executing program 0:
socket(0x11, 0x800000003, 0x0)
perf_event_open(&(0x7f000001d000)={0x1, 0x80, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, @perf_bp={0x0}}, 0x0, 0xffffffffffffffff, 0xffffffffffffffff, 0x0)
r0 = syz_io_uring_setup(0x2de5, &(0x7f0000000000)={0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, &(0x7f0000002000/0x2000)=nil, &(0x7f0000ffd000/0x3000)=nil, &(0x7f00000000c0)=<r1=>0x0, &(0x7f0000000140)=<r2=>0x0)
r3 = openat(0xffffffffffffff9c, 0x0, 0x0, 0x0)
openat(r3, &(0x7f0000002040)='./file0\x00', 0x406800, 0x0)
syz_io_uring_submit(r1, r2, &(0x7f00000001c0)=@IORING_OP_WRITEV={0x2, 0x0, 0x0, @fd_index=0x3, 0x0, 0x0}, 0x0)
io_uring_enter(r0, 0x302, 0x0, 0x0, 0x0, 0x0)
getpeername$unix(r3, 0x0, 0x0)
io_uring_enter(0xffffffffffffffff, 0x2390, 0x0, 0x0, 0x0, 0x0)

19:03:47 executing program 1:
clone(0x100, 0x0, 0xfffffffffffffffe, 0x0, 0xffffffffffffffff)
r0 = gettid()
wait4(0x0, 0x0, 0x80000002, 0x0)
vmsplice(0xffffffffffffffff, &(0x7f00000000c0)=[{0x0}, {0x0}, {0x0}, {&(0x7f0000000100)="67530700ae897094e71b0fa1f1070000003646020919dc864c42abbdfeab44bfcc83c3be704701d08b81fb83ce1e3216e0094a385b4351", 0x37}], 0x4, 0x0)
ptrace$setopts(0x4206, r0, 0x0, 0x0)
tkill(r0, 0x1e)
ptrace$cont(0x18, r0, 0x0, 0x0)
ptrace$setregs(0xd, r0, 0x0, &(0x7f0000000080))
ptrace$cont(0x1f, r0, 0x0, 0x6)

19:03:47 executing program 5:
openat$sndseq(0xffffffffffffff9c, &(0x7f0000000300), 0x4002)

19:03:47 executing program 2:
r0 = socket$inet_udp(0x2, 0x2, 0x0)
bind$inet(r0, &(0x7f0000000040)={0x2, 0x4e20, @empty}, 0x10)
r1 = socket$inet6(0xa, 0x800000000000002, 0x0)
connect$inet6(r1, &(0x7f0000000000)={0xa, 0x0, 0x0, @mcast1, 0x2}, 0x1c)
setsockopt$inet_int(r0, 0x0, 0x14, &(0x7f0000000080)=0x1183b6c8, 0x4)
connect$inet6(r1, &(0x7f0000004540)={0xa, 0x4e20, 0x0, @ipv4={'\x00', '\xff\xff', @multicast1}}, 0x1c)
sendmmsg(r1, &(0x7f0000004d80)=[{{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffe0}}], 0x1, 0x0)
recvfrom(r0, 0x0, 0x0, 0x0, 0x0, 0x0)

19:03:47 executing program 3:
r0 = socket$packet(0x11, 0x2, 0x300)
sendmsg(r0, &(0x7f0000002e00)={&(0x7f0000000700)=@nfc={0x27, 0x1, 0x0, 0x3}, 0x80, &(0x7f0000001ac0)=[{&(0x7f0000000780)='\x00', 0x1}, {&(0x7f0000001880)='9', 0x1}], 0x2}, 0x0)

19:03:47 executing program 4:
clone(0x68380080, 0x0, 0x0, 0x0, 0x0)

[   32.940627][   T25] audit: type=1400 audit(1624388627.655:8): avc:  denied  { execmem } for  pid=1762 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
[   33.064765][ T1768] cgroup: Unknown subsys name 'perf_event'
[   33.069368][ T1770] cgroup: Unknown subsys name 'perf_event'
[   33.071046][ T1768] cgroup: Unknown subsys name 'net_cls'
[   33.083267][ T1769] cgroup: Unknown subsys name 'perf_event'
[   33.091888][ T1769] cgroup: Unknown subsys name 'net_cls'
[   33.094209][ T1770] cgroup: Unknown subsys name 'net_cls'
[   33.104869][ T1771] cgroup: Unknown subsys name 'perf_event'
[   33.115237][ T1774] cgroup: Unknown subsys name 'perf_event'
[   33.116161][ T1771] cgroup: Unknown subsys name 'net_cls'
[   33.121265][ T1774] cgroup: Unknown subsys name 'net_cls'
[   33.129580][ T1775] cgroup: Unknown subsys name 'perf_event'
[   33.138150][ T1775] cgroup: Unknown subsys name 'net_cls'