[....] 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. [ 62.825890][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 62.825901][ T26] audit: type=1800 audit(1566930595.125:29): pid=9728 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 62.852302][ T26] audit: type=1800 audit(1566930595.125:30): pid=9728 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.210' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 84.432993][ T9883] ------------[ cut here ]------------ [ 84.438936][ T9883] WARNING: CPU: 0 PID: 9883 at include/net/sock.h:666 smc_unhash_sk.cold+0x11/0x18 [ 84.448384][ T9883] Kernel panic - not syncing: panic_on_warn set ... [ 84.454992][ T9883] CPU: 0 PID: 9883 Comm: syz-executor966 Not tainted 5.3.0-rc6 #120 [ 84.462956][ T9883] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 84.472990][ T9883] Call Trace: [ 84.476267][ T9883] dump_stack+0x172/0x1f0 [ 84.480581][ T9883] ? smc_listen_work+0x1580/0x15a3 [ 84.485849][ T9883] panic+0x2dc/0x755 [ 84.489727][ T9883] ? add_taint.cold+0x16/0x16 [ 84.494388][ T9883] ? __kasan_check_write+0x14/0x20 [ 84.499490][ T9883] ? __warn.cold+0x5/0x4c [ 84.503893][ T9883] ? __warn+0xe7/0x1e0 [ 84.507944][ T9883] ? smc_unhash_sk.cold+0x11/0x18 [ 84.513178][ T9883] __warn.cold+0x20/0x4c [ 84.517409][ T9883] ? smc_unhash_sk.cold+0x11/0x18 [ 84.522415][ T9883] report_bug+0x263/0x2b0 [ 84.526818][ T9883] do_error_trap+0x11b/0x200 [ 84.531447][ T9883] do_invalid_op+0x37/0x50 [ 84.535842][ T9883] ? smc_unhash_sk.cold+0x11/0x18 [ 84.540848][ T9883] invalid_op+0x23/0x30 [ 84.544984][ T9883] RIP: 0010:smc_unhash_sk.cold+0x11/0x18 [ 84.550593][ T9883] Code: 89 ff e8 3f 4b a6 fa e9 d7 f8 ff ff 4c 89 ff e8 32 4b a6 fa e9 57 fa ff ff e8 b8 3b 6c fa 48 c7 c7 a0 3b 42 88 e8 f0 da 55 fa <0f> 0b e9 ad 43 ff ff e8 a0 3b 6c fa 48 c7 c7 a0 3b 42 88 e8 d8 da [ 84.571406][ T9883] RSP: 0018:ffff888095a1fb98 EFLAGS: 00010286 [ 84.577632][ T9883] RAX: 0000000000000024 RBX: ffff8880946f1240 RCX: 0000000000000000 [ 84.585674][ T9883] RDX: 0000000000000000 RSI: ffffffff815c2576 RDI: ffffed1012b43f65 [ 84.593818][ T9883] RBP: ffff888095a1fbc8 R08: 0000000000000024 R09: ffffed1015d060d1 [ 84.601868][ T9883] R10: ffffed1015d060d0 R11: ffff8880ae830687 R12: ffff8880946f12c0 [ 84.609825][ T9883] R13: ffffffff8999e200 R14: ffff8880946f1268 R15: 0000000000000001 [ 84.617959][ T9883] ? vprintk_func+0x86/0x189 [ 84.622619][ T9883] ? smc_unhash_sk.cold+0x11/0x18 [ 84.627625][ T9883] __smc_release+0x202/0x450 [ 84.632200][ T9883] smc_release+0x10c/0x380 [ 84.636690][ T9883] __sock_release+0xce/0x280 [ 84.641275][ T9883] sock_close+0x1e/0x30 [ 84.645413][ T9883] __fput+0x2ff/0x890 [ 84.649376][ T9883] ? __sock_release+0x280/0x280 [ 84.654213][ T9883] ____fput+0x16/0x20 [ 84.658261][ T9883] task_work_run+0x145/0x1c0 [ 84.662842][ T9883] do_exit+0x92f/0x2e50 [ 84.666979][ T9883] ? mm_update_next_owner+0x640/0x640 [ 84.672329][ T9883] ? down_read_non_owner+0x450/0x450 [ 84.678205][ T9883] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 84.684427][ T9883] ? handle_mm_fault+0x1d3/0x6b0 [ 84.689522][ T9883] do_group_exit+0x135/0x360 [ 84.694376][ T9883] __ia32_sys_exit_group+0x44/0x50 [ 84.699558][ T9883] do_fast_syscall_32+0x27b/0xdb3 [ 84.704570][ T9883] entry_SYSENTER_compat+0x70/0x7f [ 84.709700][ T9883] RIP: 0023:0xf7f59a29 [ 84.714150][ T9883] Code: b8 80 96 98 00 eb cc 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 84.734088][ T9883] RSP: 002b:00000000ffc6c40c EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 84.742587][ T9883] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080ed298 [ 84.750718][ T9883] RDX: 0000000000000000 RSI: 00000000080d6e7c RDI: 00000000080ed2a0 [ 84.759178][ T9883] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 84.767321][ T9883] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 84.788304][ T9883] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 84.797560][ T9883] Kernel Offset: disabled [ 84.802118][ T9883] Rebooting in 86400 seconds..