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 '10.128.0.13' (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 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 59.511047] WARNING: CPU: 0 PID: 4320 at ./include/net/sock.h:639 smc_unhash_sk+0x335/0x450 [ 59.519558] Kernel panic - not syncing: panic_on_warn set ... [ 59.519558] [ 59.526901] CPU: 0 PID: 4320 Comm: syzkaller551221 Not tainted 4.16.0-rc6+ #286 [ 59.534313] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.543635] Call Trace: [ 59.546213] dump_stack+0x194/0x24d [ 59.549810] ? arch_local_irq_restore+0x53/0x53 [ 59.554450] ? vsnprintf+0x1ed/0x1900 [ 59.558222] panic+0x1e4/0x41c [ 59.561386] ? refcount_error_report+0x214/0x214 [ 59.566112] ? show_regs_print_info+0x18/0x18 [ 59.570580] ? __destroy_inode+0x660/0x660 [ 59.574785] ? __warn+0x1c1/0x200 [ 59.578209] ? smc_unhash_sk+0x335/0x450 [ 59.582238] __warn+0x1dc/0x200 [ 59.585486] ? smc_unhash_sk+0x335/0x450 [ 59.589519] report_bug+0x1f4/0x2b0 [ 59.593117] fixup_bug.part.11+0x37/0x80 [ 59.597152] do_error_trap+0x2d7/0x3e0 [ 59.601020] ? math_error+0x400/0x400 [ 59.604793] ? lock_acquire+0x1d5/0x580 [ 59.608736] ? lock_acquire+0x1d5/0x580 [ 59.612687] ? smc_unhash_sk+0xce/0x450 [ 59.616636] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 59.621450] do_invalid_op+0x1b/0x20 [ 59.625145] invalid_op+0x1b/0x40 [ 59.628570] RIP: 0010:smc_unhash_sk+0x335/0x450 [ 59.633206] RSP: 0018:ffff8801b16ff198 EFLAGS: 00010293 [ 59.638537] RAX: ffff8801b7946580 RBX: 1ffff100362dfe37 RCX: ffffffff864ad985 [ 59.645776] RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 1ffff100362dfe3b [ 59.653026] RBP: ffff8801b16ff280 R08: dffffc0000000000 R09: 0000000000000000 [ 59.660266] R10: ffff8801b16ff050 R11: ffffffff8833baf8 R12: ffff8801b16ff258 [ 59.667504] R13: ffffffff8833bae0 R14: ffff8801b0e727c0 R15: 1ffff100362dfe3b [ 59.674751] ? smc_unhash_sk+0x335/0x450 [ 59.678783] ? smc_unhash_sk+0x335/0x450 [ 59.682816] ? smc_hash_sk+0x2f0/0x2f0 [ 59.686673] ? release_sock+0x1d4/0x2a0 [ 59.690617] ? do_raw_write_trylock+0x190/0x190 [ 59.695255] ? __release_sock+0x360/0x360 [ 59.699372] ? smc_release+0x23d/0x580 [ 59.703228] ? trace_hardirqs_on+0xd/0x10 [ 59.707344] ? __local_bh_enable_ip+0x121/0x230 [ 59.711984] smc_release+0x322/0x580 [ 59.715671] sock_release+0x8d/0x1e0 [ 59.719354] ? sock_alloc_file+0x560/0x560 [ 59.723555] sock_close+0x16/0x20 [ 59.726981] __fput+0x327/0x7e0 [ 59.730234] ? fput+0x140/0x140 [ 59.733494] ? lock_release+0xa40/0xa40 [ 59.737442] ____fput+0x15/0x20 [ 59.740703] task_work_run+0x199/0x270 [ 59.744561] ? task_work_cancel+0x210/0x210 [ 59.748853] ? _raw_spin_unlock+0x22/0x30 [ 59.752985] ? switch_task_namespaces+0x87/0xc0 [ 59.757630] do_exit+0x9bb/0x1ad0 [ 59.761071] ? futex_wait_queue_me+0x52f/0x7f0 [ 59.765626] ? mm_update_next_owner+0x930/0x930 [ 59.770264] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 59.775424] ? lock_downgrade+0x980/0x980 [ 59.779542] ? __unqueue_futex+0x1c0/0x290 [ 59.783743] ? lock_release+0xa40/0xa40 [ 59.787700] ? fault_in_user_writeable+0x90/0x90 [ 59.792425] ? do_raw_spin_trylock+0x190/0x190 [ 59.796996] ? futex_wake+0x680/0x680 [ 59.800769] ? drop_futex_key_refs.isra.13+0x63/0xb0 [ 59.805843] ? futex_wait+0x6a9/0x9a0 [ 59.809617] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 59.814776] ? hash_futex+0x15/0x210 [ 59.818458] ? drop_futex_key_refs.isra.13+0x63/0xb0 [ 59.823530] ? futex_wake+0x2ca/0x680 [ 59.827301] ? sock_def_error_report+0x272/0x5e0 [ 59.832031] ? memset+0x31/0x40 [ 59.835282] ? __dequeue_signal+0x103/0x760 [ 59.839577] ? recalc_sigpending_tsk+0x117/0x150 [ 59.844305] ? get_signal+0x7a9/0x16d0 [ 59.848160] ? lock_downgrade+0x980/0x980 [ 59.852281] do_group_exit+0x149/0x400 [ 59.856137] ? do_raw_spin_trylock+0x190/0x190 [ 59.860689] ? SyS_exit+0x30/0x30 [ 59.864131] get_signal+0x73a/0x16d0 [ 59.867819] ? ptrace_notify+0x130/0x130 [ 59.871850] ? release_sock+0x1d4/0x2a0 [ 59.875793] ? lock_downgrade+0x980/0x980 [ 59.879910] ? lock_downgrade+0x980/0x980 [ 59.884024] ? lock_release+0xa40/0xa40 [ 59.887967] ? release_sock+0x1d4/0x2a0 [ 59.891913] ? trace_hardirqs_on+0xd/0x10 [ 59.896031] ? __local_bh_enable_ip+0x121/0x230 [ 59.900677] ? do_raw_spin_trylock+0x190/0x190 [ 59.905228] ? release_sock+0x1d4/0x2a0 [ 59.909170] ? trace_hardirqs_on+0xd/0x10 [ 59.913291] do_signal+0x90/0x1e90 [ 59.916800] ? release_sock+0x1d4/0x2a0 [ 59.920742] ? __release_sock+0x360/0x360 [ 59.924871] ? setup_sigcontext+0x7d0/0x7d0 [ 59.929164] ? kernel_connect+0x6a/0x90 [ 59.933116] ? smc_connect+0x19f/0x210 [ 59.936972] ? fput+0xd2/0x140 [ 59.940139] ? SYSC_connect+0x2e0/0x4a0 [ 59.944084] ? SYSC_bind+0x410/0x410 [ 59.947774] ? SyS_futex+0x269/0x390 [ 59.951463] exit_to_usermode_loop+0x258/0x2f0 [ 59.956013] ? retint_kernel+0x10/0x10 [ 59.959883] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 59.965396] do_syscall_64+0x6ec/0x940 [ 59.969252] ? __do_page_fault+0xc90/0xc90 [ 59.973457] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 59.978975] ? syscall_return_slowpath+0x550/0x550 [ 59.983873] ? syscall_return_slowpath+0x2ac/0x550 [ 59.988774] ? prepare_exit_to_usermode+0x227/0x350 [ 59.993758] ? perf_trace_sys_enter+0xcb0/0xcb0 [ 59.998397] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 60.003212] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 60.008372] RIP: 0033:0x445d79 [ 60.011532] RSP: 002b:00007f8ab3ceecf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 60.019208] RAX: fffffffffffffe00 RBX: 00000000006dac24 RCX: 0000000000445d79 [ 60.026446] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006dac24 [ 60.033684] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 60.040926] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 60.048163] R13: 00007ffdd776e2af R14: 00007f8ab3cef9c0 R15: 0000000000000003 [ 60.055775] Dumping ftrace buffer: [ 60.059282] (ftrace buffer empty) [ 60.062961] Kernel Offset: disabled [ 60.066559] Rebooting in 86400 seconds..