[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.626661][ T26] audit: type=1800 audit(1569341588.958:25): pid=7096 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.646326][ T26] audit: type=1800 audit(1569341588.958:26): pid=7096 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.672880][ T26] audit: type=1800 audit(1569341588.958:27): pid=7096 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 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 '10.128.1.62' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 44.938172][ T7249] ------------[ cut here ]------------ [ 44.943671][ T7249] mismatching kcsan_end_atomic() [ 44.943748][ T7249] WARNING: CPU: 0 PID: 7249 at kernel/kcsan/core.c:264 kcsan_end_atomic+0x60/0xd0 [ 44.957868][ T7249] Kernel panic - not syncing: panic_on_warn set ... [ 44.964433][ T7249] CPU: 0 PID: 7249 Comm: syz-executor433 Not tainted 5.3.0+ #0 [ 44.971994][ T7249] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.982030][ T7249] Call Trace: [ 44.985307][ T7249] dump_stack+0xf5/0x159 [ 44.989539][ T7249] panic+0x209/0x639 [ 44.993417][ T7249] ? kcsan_end_atomic+0x60/0xd0 [ 44.998246][ T7249] __warn.cold+0x4c/0x4d [ 45.002508][ T7249] ? kcsan_end_atomic+0x60/0xd0 [ 45.007410][ T7249] report_bug+0x1cf/0x1e0 [ 45.011729][ T7249] do_error_trap+0xda/0x140 [ 45.016219][ T7249] do_invalid_op+0x43/0x60 [ 45.020620][ T7249] ? kcsan_end_atomic+0x60/0xd0 [ 45.025479][ T7249] invalid_op+0x1e/0x30 [ 45.029622][ T7249] RIP: 0010:kcsan_end_atomic+0x60/0xd0 [ 45.035064][ T7249] Code: 89 e5 74 77 65 ff 05 1f 90 af 7e 65 8b 05 b0 90 ae 7e a9 00 01 1f 00 75 77 e8 cc fe ff ff 48 c7 c7 70 34 60 85 e8 78 1c db ff <0f> 0b e8 09 ff ff ff 5d c3 a9 00 01 1f 00 75 14 65 48 8b 04 25 40 [ 45.054646][ T7249] RSP: 0018:ffffc90001687380 EFLAGS: 00010282 [ 45.060687][ T7249] RAX: 0000000000000000 RBX: ffff88812ac29c00 RCX: 0000000000000000 [ 45.068635][ T7249] RDX: 0000000000000000 RSI: ffffffff81388b3d RDI: 0000000000000006 [ 45.076613][ T7249] RBP: ffffc90001687380 R08: ffff88812264f0c0 R09: 000000000000001e [ 45.084564][ T7249] R10: 0000000039343237 R11: 0000000034323754 R12: 0000000000000420 [ 45.092517][ T7249] R13: ffff8881293ca000 R14: ffff88812ac29cbc R15: ffffe8ffffc1bac0 [ 45.100487][ T7249] ? vprintk_func+0x8d/0x140 [ 45.105064][ T7249] __dev_queue_xmit+0x175f/0x1b80 [ 45.110069][ T7249] ? __tsan_write8+0x18/0x40 [ 45.114640][ T7249] ? __neigh_event_send+0x970/0x970 [ 45.119838][ T7249] ? __tsan_write_range+0x18/0x40 [ 45.124847][ T7249] dev_queue_xmit+0x21/0x30 [ 45.129335][ T7249] neigh_resolve_output+0x44a/0x470 [ 45.134521][ T7249] ip_finish_output2+0x4a9/0xe30 [ 45.139440][ T7249] ? ip_send_check+0x85/0x90 [ 45.144016][ T7249] ip_do_fragment+0xccb/0xda0 [ 45.148676][ T7249] ? ip_append_data.part.0+0x140/0x140 [ 45.154118][ T7249] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 45.159996][ T7249] ip_fragment.constprop.0+0xd8/0x160 [ 45.165353][ T7249] __ip_finish_output+0x2f8/0x490 [ 45.170359][ T7249] ? ipv4_confirm+0xdc/0x160 [ 45.174954][ T7249] ip_finish_output+0x41/0x160 [ 45.179702][ T7249] ip_mc_output+0x143/0x620 [ 45.184191][ T7249] ? __ip_finish_output+0x490/0x490 [ 45.189391][ T7249] ip_local_out+0x74/0x90 [ 45.193702][ T7249] ip_send_skb+0x35/0xb0 [ 45.197926][ T7249] ip_push_pending_frames+0x5b/0x80 [ 45.203107][ T7249] raw_sendmsg+0xe7d/0x1cd0 [ 45.207598][ T7249] ? __tsan_read8+0x15/0x30 [ 45.212080][ T7249] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 45.217783][ T7249] ? __tsan_read8+0x15/0x30 [ 45.222275][ T7249] ? aa_sk_perm+0x1a4/0x450 [ 45.226758][ T7249] ? __tsan_read2+0x15/0x30 [ 45.231243][ T7249] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 45.237468][ T7249] inet_sendmsg+0x6d/0x90 [ 45.241777][ T7249] ? inet_sendmsg+0x6d/0x90 [ 45.246260][ T7249] ? inet_send_prepare+0x200/0x200 [ 45.251349][ T7249] sock_sendmsg+0x9f/0xc0 [ 45.255662][ T7249] kernel_sendmsg+0x4d/0x70 [ 45.260148][ T7249] sock_no_sendpage+0xda/0x110 [ 45.264900][ T7249] inet_sendpage+0xe7/0x100 [ 45.269384][ T7249] kernel_sendpage+0x7b/0xc0 [ 45.273958][ T7249] ? inet_sendmsg+0x90/0x90 [ 45.278441][ T7249] sock_sendpage+0x6c/0x90 [ 45.282843][ T7249] ? kernel_sendpage+0xc0/0xc0 [ 45.287587][ T7249] pipe_to_sendpage+0x102/0x180 [ 45.292426][ T7249] __splice_from_pipe+0x248/0x480 [ 45.297434][ T7249] ? direct_splice_actor+0xc0/0xc0 [ 45.302529][ T7249] splice_from_pipe+0xbb/0x100 [ 45.307289][ T7249] ? direct_splice_actor+0xc0/0xc0 [ 45.312388][ T7249] generic_splice_sendpage+0x45/0x60 [ 45.317668][ T7249] ? splice_from_pipe+0x100/0x100 [ 45.322675][ T7249] do_splice+0x497/0xbe0 [ 45.326906][ T7249] __x64_sys_splice+0x20a/0x220 [ 45.331746][ T7249] do_syscall_64+0xcf/0x2f0 [ 45.336234][ T7249] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.342108][ T7249] RIP: 0033:0x445949 [ 45.345987][ T7249] Code: e8 bc b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 45.365567][ T7249] RSP: 002b:00007f16a3064da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 [ 45.373958][ T7249] RAX: ffffffffffffffda RBX: 00000000006dac78 RCX: 0000000000445949 [ 45.381910][ T7249] RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000003 [ 45.389858][ T7249] RBP: 00000000006dac70 R08: 0000000000019404 R09: 0000000000000000 [ 45.397812][ T7249] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac7c [ 45.405769][ T7249] R13: 00007ffd617cfc7f R14: 00007f16a30659c0 R15: 20c49ba5e353f7cf [ 45.415238][ T7249] Kernel Offset: disabled [ 45.419560][ T7249] Rebooting in 86400 seconds..