[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 50.004633][ T26] audit: type=1800 audit(1566966802.241:25): pid=8226 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 50.025964][ T26] audit: type=1800 audit(1566966802.251:26): pid=8226 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 50.047458][ T26] audit: type=1800 audit(1566966802.251:27): pid=8226 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] 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 '10.128.0.166' (ECDSA) to the list of known hosts. executing program executing program executing program executing program syzkaller login: [ 60.985835][ T8382] ------------[ cut here ]------------ [ 60.991417][ T8382] WARNING: CPU: 0 PID: 8382 at include/net/sock.h:666 smc_unhash_sk+0x1ea/0x260 [ 61.000415][ T8382] Kernel panic - not syncing: panic_on_warn set ... [ 61.006993][ T8382] CPU: 0 PID: 8382 Comm: syz-executor418 Not tainted 5.3.0-rc6-next-20190827 #74 [ 61.016068][ T8382] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.028166][ T8382] Call Trace: [ 61.031460][ T8382] dump_stack+0x172/0x1f0 [ 61.035800][ T8382] ? smc_unhash_sk+0x190/0x260 [ 61.040545][ T8382] panic+0x2dc/0x755 [ 61.044449][ T8382] ? add_taint.cold+0x16/0x16 [ 61.049288][ T8382] ? printk+0xba/0xed [ 61.053260][ T8382] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 61.058692][ T8382] ? __warn.cold+0x14/0x3c [ 61.063081][ T8382] ? __warn+0xd9/0x1d0 [ 61.067136][ T8382] ? smc_unhash_sk+0x1ea/0x260 [ 61.071881][ T8382] __warn.cold+0x2f/0x3c [ 61.076122][ T8382] ? report_bug.cold+0x63/0xad [ 61.080862][ T8382] ? smc_unhash_sk+0x1ea/0x260 [ 61.085600][ T8382] report_bug+0x289/0x300 [ 61.089943][ T8382] do_error_trap+0x11b/0x200 [ 61.094598][ T8382] do_invalid_op+0x37/0x50 [ 61.098995][ T8382] ? smc_unhash_sk+0x1ea/0x260 [ 61.103910][ T8382] invalid_op+0x23/0x30 [ 61.108040][ T8382] RIP: 0010:smc_unhash_sk+0x1ea/0x260 [ 61.113388][ T8382] Code: ff ff ff ff e8 b7 2e 8c fe e8 92 85 67 fa 4c 89 ef e8 ca 58 38 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 76 85 67 fa <0f> 0b eb 86 4c 89 e7 e8 1a 6c a2 fa e9 5f ff ff ff e8 30 6c a2 fa [ 61.132983][ T8382] RSP: 0018:ffff88809328fba8 EFLAGS: 00010293 [ 61.139037][ T8382] RAX: ffff888095ee6180 RBX: ffff888096ff9240 RCX: ffffffff870aa7de [ 61.146993][ T8382] RDX: 0000000000000000 RSI: ffffffff870aa85a RDI: 0000000000000005 [ 61.155043][ T8382] RBP: ffff88809328fbd8 R08: ffff888095ee6180 R09: ffffed1012dff259 [ 61.163172][ T8382] R10: ffffed1012dff258 R11: ffff888096ff92c3 R12: ffff888096ff92c0 [ 61.171207][ T8382] R13: ffffffff89b9f760 R14: ffff888096ff9268 R15: 0000000000000001 [ 61.179174][ T8382] ? smc_unhash_sk+0x16e/0x260 [ 61.183918][ T8382] ? smc_unhash_sk+0x1ea/0x260 [ 61.188664][ T8382] ? smc_unhash_sk+0x1ea/0x260 [ 61.193404][ T8382] __smc_release+0x202/0x450 [ 61.197973][ T8382] smc_release+0x10c/0x380 [ 61.202386][ T8382] __sock_release+0xce/0x280 [ 61.206969][ T8382] sock_close+0x1e/0x30 [ 61.211118][ T8382] __fput+0x2ff/0x890 [ 61.215090][ T8382] ? __sock_release+0x280/0x280 [ 61.219923][ T8382] ____fput+0x16/0x20 [ 61.223884][ T8382] task_work_run+0x145/0x1c0 [ 61.228454][ T8382] do_exit+0x904/0x2e60 [ 61.232605][ T8382] ? mm_update_next_owner+0x640/0x640 [ 61.237954][ T8382] ? down_read_non_owner+0x490/0x490 [ 61.243325][ T8382] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 61.249540][ T8382] ? handle_mm_fault+0x1d3/0x6c0 [ 61.254563][ T8382] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 61.259997][ T8382] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 61.265436][ T8382] do_group_exit+0x135/0x360 [ 61.270011][ T8382] __x64_sys_exit_group+0x44/0x50 [ 61.275021][ T8382] do_syscall_64+0xfa/0x760 [ 61.279509][ T8382] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 61.285385][ T8382] RIP: 0033:0x43ff28 [ 61.289278][ T8382] Code: 00 00 be 3c 00 00 00 eb 19 66 0f 1f 84 00 00 00 00 00 48 89 d7 89 f0 0f 05 48 3d 00 f0 ff ff 77 21 f4 48 89 d7 44 89 c0 0f 05 <48> 3d 00 f0 ff ff 76 e0 f7 d8 64 41 89 01 eb d8 0f 1f 84 00 00 00 [ 61.308872][ T8382] RSP: 002b:00007ffee27df9c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 61.317373][ T8382] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ff28 [ 61.325413][ T8382] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 61.333367][ T8382] RBP: 00000000004bf750 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 61.341319][ T8382] R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000000001 [ 61.349269][ T8382] R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000 [ 61.358679][ T8382] Kernel Offset: disabled [ 61.363184][ T8382] Rebooting in 86400 seconds..