[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 80.341151][ T23] audit: type=1800 audit(1580029095.650:25): pid=9348 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 80.360940][ T23] audit: type=1800 audit(1580029095.650:26): pid=9348 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 80.418977][ T23] audit: type=1800 audit(1580029095.650:27): pid=9348 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 '10.128.0.69' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 108.251709][ T9514] kasan: CONFIG_KASAN_INLINE enabled [ 108.251741][ T9514] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 108.251758][ T9514] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 108.251773][ T9514] CPU: 0 PID: 9514 Comm: syz-executor998 Not tainted 5.5.0-rc7-syzkaller #0 [ 108.251781][ T9514] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 108.251807][ T9514] RIP: 0010:do_con_write.part.0+0xa01/0x1ef0 [ 108.251822][ T9514] Code: 7e fe ff ff 45 01 ef e8 fd 70 87 fd 48 8b 85 c8 fe ff ff 80 38 00 0f 85 71 12 00 00 49 8b 9e a0 03 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 14 20 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 [ 108.251830][ T9514] RSP: 0018:ffffc90002077828 EFLAGS: 00010203 [ 108.251841][ T9514] RAX: 0000000020000001 RBX: 000000010000000e RCX: ffffffff83ed8610 [ 108.251849][ T9514] RDX: 0000000000000000 RSI: ffffffff83ed8663 RDI: 0000000000000003 [ 108.251858][ T9514] RBP: ffffc900020779b8 R08: ffff8880913785c0 R09: ffff888091378e50 [ 108.251869][ T9514] R10: fffffbfff14f66d8 R11: ffffffff8a7b36c7 R12: dffffc0000000000 [ 108.251878][ T9514] R13: 0000000000000000 R14: ffff888097bda000 R15: 0000000000000764 [ 108.251889][ T9514] FS: 0000000000f2d880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 108.251898][ T9514] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 108.251906][ T9514] CR2: 0000000020001440 CR3: 0000000093652000 CR4: 00000000001406f0 [ 108.251922][ T9514] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 108.251930][ T9514] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 108.251934][ T9514] Call Trace: [ 108.251964][ T9514] ? do_con_trol+0x61b0/0x61b0 [ 108.251979][ T9514] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 108.251990][ T9514] ? add_wait_queue+0x112/0x170 [ 108.252002][ T9514] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 108.252018][ T9514] ? trace_hardirqs_on+0x67/0x240 [ 108.252036][ T9514] con_write+0x46/0xd0 [ 108.252054][ T9514] n_tty_write+0x40e/0x1080 [ 108.252077][ T9514] ? n_tty_read+0x1bf0/0x1bf0 [ 108.252090][ T9514] ? prepare_to_wait_exclusive+0x320/0x320 [ 108.252123][ T9514] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 108.252138][ T9514] ? _copy_from_user+0x12c/0x1a0 [ 108.252154][ T9514] tty_write+0x496/0x7f0 [ 108.252171][ T9514] ? n_tty_read+0x1bf0/0x1bf0 [ 108.252187][ T9514] do_iter_write+0x4a0/0x610 [ 108.252199][ T9514] ? dup_iter+0x260/0x260 [ 108.252216][ T9514] vfs_writev+0x1b3/0x2f0 [ 108.252235][ T9514] ? vfs_iter_write+0xb0/0xb0 [ 108.252246][ T9514] ? find_held_lock+0x35/0x130 [ 108.252263][ T9514] ? __do_page_fault+0x56a/0xd80 [ 108.252278][ T9514] ? lock_downgrade+0x920/0x920 [ 108.252299][ T9514] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 108.252312][ T9514] ? __fget_light+0x1a9/0x230 [ 108.252329][ T9514] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 108.252343][ T9514] do_writev+0x15b/0x330 [ 108.252357][ T9514] ? vfs_writev+0x2f0/0x2f0 [ 108.252374][ T9514] ? do_syscall_64+0x26/0x790 [ 108.252388][ T9514] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 108.252403][ T9514] ? do_syscall_64+0x26/0x790 [ 108.252419][ T9514] __x64_sys_writev+0x75/0xb0 [ 108.252435][ T9514] do_syscall_64+0xfa/0x790 [ 108.252451][ T9514] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 108.252460][ T9514] RIP: 0033:0x441509 [ 108.252474][ T9514] Code: e8 ac e8 ff ff 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 108.252481][ T9514] RSP: 002b:00007ffff60ed758 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 108.252493][ T9514] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441509 [ 108.252501][ T9514] RDX: 0000000000000001 RSI: 0000000020001440 RDI: 0000000000000003 [ 108.252509][ T9514] RBP: 00000000006cc018 R08: 000000000000000e R09: 00000000004002c8 [ 108.252517][ T9514] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402280 [ 108.252525][ T9514] R13: 0000000000402310 R14: 0000000000000000 R15: 0000000000000000 [ 108.252536][ T9514] Modules linked in: [ 108.252665][ T9514] ---[ end trace 4892bb1d9eb42968 ]--- [ 108.252683][ T9514] RIP: 0010:do_con_write.part.0+0xa01/0x1ef0 [ 108.252697][ T9514] Code: 7e fe ff ff 45 01 ef e8 fd 70 87 fd 48 8b 85 c8 fe ff ff 80 38 00 0f 85 71 12 00 00 49 8b 9e a0 03 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 14 20 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 [ 108.252703][ T9514] RSP: 0018:ffffc90002077828 EFLAGS: 00010203 [ 108.252714][ T9514] RAX: 0000000020000001 RBX: 000000010000000e RCX: ffffffff83ed8610 [ 108.252722][ T9514] RDX: 0000000000000000 RSI: ffffffff83ed8663 RDI: 0000000000000003 [ 108.252730][ T9514] RBP: ffffc900020779b8 R08: ffff8880913785c0 R09: ffff888091378e50 [ 108.252739][ T9514] R10: fffffbfff14f66d8 R11: ffffffff8a7b36c7 R12: dffffc0000000000 [ 108.252747][ T9514] R13: 0000000000000000 R14: ffff888097bda000 R15: 0000000000000764 [ 108.252758][ T9514] FS: 0000000000f2d880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 108.252767][ T9514] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 108.252775][ T9514] CR2: 0000000020001440 CR3: 0000000093652000 CR4: 00000000001406f0 [ 108.252787][ T9514] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 108.252795][ T9514] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 108.252802][ T9514] Kernel panic - not syncing: Fatal exception [ 108.254123][ T9514] Kernel Offset: disabled