[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 55.912502][ T26] audit: type=1800 audit(1566957489.653:25): pid=8743 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 55.959040][ T26] audit: type=1800 audit(1566957489.653:26): pid=8743 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.008126][ T26] audit: type=1800 audit(1566957489.653:27): pid=8743 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 '10.128.0.94' (ECDSA) to the list of known hosts. executing program executing program executing program executing program syzkaller login: [ 78.880070][ T8901] ------------[ cut here ]------------ [ 78.886481][ T8901] WARNING: CPU: 1 PID: 8901 at include/net/sock.h:666 smc_unhash_sk.cold+0x11/0x18 [ 78.895835][ T8901] Kernel panic - not syncing: panic_on_warn set ... [ 78.902635][ T8901] CPU: 1 PID: 8901 Comm: syz-executor919 Not tainted 5.3.0-rc5+ #151 [ 78.910759][ T8901] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.920794][ T8901] Call Trace: [ 78.924132][ T8901] dump_stack+0x172/0x1f0 [ 78.928546][ T8901] ? smc_listen_work+0x14d0/0x15ac [ 78.933652][ T8901] panic+0x2dc/0x755 [ 78.937543][ T8901] ? add_taint.cold+0x16/0x16 [ 78.942208][ T8901] ? __kasan_check_write+0x14/0x20 [ 78.947298][ T8901] ? __warn.cold+0x5/0x4c [ 78.951613][ T8901] ? __warn+0xe7/0x1e0 [ 78.955672][ T8901] ? smc_unhash_sk.cold+0x11/0x18 [ 78.960691][ T8901] __warn.cold+0x20/0x4c [ 78.964933][ T8901] ? smc_unhash_sk.cold+0x11/0x18 [ 78.970032][ T8901] report_bug+0x263/0x2b0 [ 78.974348][ T8901] do_error_trap+0x11b/0x200 [ 78.978920][ T8901] do_invalid_op+0x37/0x50 [ 78.983314][ T8901] ? smc_unhash_sk.cold+0x11/0x18 [ 78.988316][ T8901] invalid_op+0x23/0x30 [ 78.992451][ T8901] RIP: 0010:smc_unhash_sk.cold+0x11/0x18 [ 78.998061][ T8901] Code: 89 ff e8 06 2a a4 fa e9 ce f8 ff ff 4c 89 ff e8 f9 29 a4 fa e9 4e fa ff ff e8 4f 01 6a fa 48 c7 c7 00 63 62 88 e8 17 a2 53 fa <0f> 0b e9 94 43 ff ff e8 37 01 6a fa 48 c7 c7 00 63 62 88 e8 ff a1 [ 79.017643][ T8901] RSP: 0018:ffff88808cdf7ba8 EFLAGS: 00010286 [ 79.023684][ T8901] RAX: 0000000000000024 RBX: ffff88808c841280 RCX: 0000000000000000 [ 79.031675][ T8901] RDX: 0000000000000000 RSI: ffffffff815c2456 RDI: ffffed10119bef67 [ 79.039638][ T8901] RBP: ffff88808cdf7bd8 R08: 0000000000000024 R09: ffffed1015d260d1 [ 79.047609][ T8901] R10: ffffed1015d260d0 R11: ffff8880ae930687 R12: ffff88808c841300 [ 79.055735][ T8901] R13: ffffffff89ba0420 R14: ffff88808c8412a8 R15: 0000000000000001 [ 79.063713][ T8901] ? vprintk_func+0x86/0x189 [ 79.068289][ T8901] ? smc_unhash_sk.cold+0x11/0x18 [ 79.073315][ T8901] __smc_release+0x202/0x450 [ 79.077893][ T8901] smc_release+0x10c/0x380 [ 79.082304][ T8901] __sock_release+0xce/0x280 [ 79.086893][ T8901] sock_close+0x1e/0x30 [ 79.091044][ T8901] __fput+0x2ff/0x890 [ 79.095017][ T8901] ? __sock_release+0x280/0x280 [ 79.099855][ T8901] ____fput+0x16/0x20 [ 79.103833][ T8901] task_work_run+0x145/0x1c0 [ 79.108421][ T8901] do_exit+0x92f/0x2e50 [ 79.112568][ T8901] ? mm_update_next_owner+0x640/0x640 [ 79.117929][ T8901] ? down_read_non_owner+0x450/0x450 [ 79.123334][ T8901] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 79.129556][ T8901] ? handle_mm_fault+0x1d3/0x6b0 [ 79.134488][ T8901] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 79.139995][ T8901] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 79.145673][ T8901] do_group_exit+0x135/0x360 [ 79.150399][ T8901] __x64_sys_exit_group+0x44/0x50 [ 79.155403][ T8901] do_syscall_64+0xfd/0x6a0 [ 79.159901][ T8901] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 79.165788][ T8901] RIP: 0033:0x43ff28 [ 79.169673][ T8901] 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 [ 79.189278][ T8901] RSP: 002b:00007ffd357823e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 79.197698][ T8901] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ff28 [ 79.205823][ T8901] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 79.213788][ T8901] RBP: 00000000004bf750 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 79.221749][ T8901] R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000000001 [ 79.229715][ T8901] R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000 [ 79.238965][ T8901] Kernel Offset: disabled [ 79.243362][ T8901] Rebooting in 86400 seconds..