[ 82.397405][ T27] audit: type=1800 audit(1579576078.545:25): pid=9901 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 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. [ 83.548924][ T27] kauditd_printk_skb: 3 callbacks suppressed [ 83.548937][ T27] audit: type=1800 audit(1579576079.695:29): pid=9901 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 [ 83.575434][ T27] audit: type=1800 audit(1579576079.705:30): pid=9901 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 '10.128.0.141' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 95.539120][T10053] BUG: unable to handle page fault for address: 000000010000000e [ 95.539129][T10053] #PF: supervisor write access in kernel mode [ 95.539136][T10053] #PF: error_code(0x0002) - not-present page [ 95.539140][T10053] PGD 8c456067 P4D 8c456067 PUD 0 [ 95.539158][T10053] Oops: 0002 [#1] PREEMPT SMP KASAN [ 95.539173][T10053] CPU: 0 PID: 10053 Comm: syz-executor536 Not tainted 5.5.0-rc7-syzkaller #0 [ 95.539180][T10053] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 95.539203][T10053] RIP: 0010:do_con_trol+0x47ea/0x61b0 [ 95.539216][T10053] Code: 08 2c 01 0f 8e b1 00 00 00 4c 8b bd 08 ff ff ff 48 63 db 44 89 e9 41 0f b7 84 24 c8 03 00 00 48 01 db d1 e9 49 01 df 4c 89 ff 66 ab 49 8d bc 24 78 04 00 00 b8 ff ff 37 00 48 89 fa 48 c1 e0 [ 95.539224][T10053] RSP: 0018:ffffc90001f278b0 EFLAGS: 00010202 [ 95.539234][T10053] RAX: 0000000000000720 RBX: 0000000000000000 RCX: 0000000000000001 [ 95.539242][T10053] RDX: 1ffff11012ed1679 RSI: ffffffff83ed594d RDI: 000000010000000e [ 95.539251][T10053] RBP: ffffc90001f279d0 R08: ffff8880985e2040 R09: ffff8880985e28d0 [ 95.539259][T10053] R10: fffffbfff14f69d0 R11: ffffffff8a7b4e87 R12: ffff88809768b000 [ 95.539267][T10053] R13: 0000000000000002 R14: 0000000000000001 R15: 000000010000000e [ 95.539276][T10053] FS: 0000000001708880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 95.539284][T10053] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 95.539291][T10053] CR2: 000000010000000e CR3: 00000000a0710000 CR4: 00000000001406f0 [ 95.539303][T10053] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 95.539310][T10053] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 95.539313][T10053] Call Trace: [ 95.539332][T10053] ? reset_palette+0x190/0x190 [ 95.539349][T10053] ? __kasan_check_read+0x11/0x20 [ 95.539368][T10053] ? __atomic_notifier_call_chain+0xf8/0x1a0 [ 95.539384][T10053] do_con_write.part.0+0xfd9/0x1ef0 [ 95.539407][T10053] ? do_con_trol+0x61b0/0x61b0 [ 95.539421][T10053] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 95.539431][T10053] ? add_wait_queue+0x112/0x170 [ 95.539443][T10053] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 95.539458][T10053] ? trace_hardirqs_on+0x67/0x240 [ 95.539475][T10053] con_write+0x46/0xd0 [ 95.539490][T10053] n_tty_write+0x40e/0x1080 [ 95.539509][T10053] ? n_tty_read+0x1bf0/0x1bf0 [ 95.539520][T10053] ? prepare_to_wait_exclusive+0x320/0x320 [ 95.539536][T10053] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 95.539552][T10053] ? _copy_from_user+0x12c/0x1a0 [ 95.539593][T10053] tty_write+0x496/0x7f0 [ 95.539611][T10053] ? n_tty_read+0x1bf0/0x1bf0 [ 95.539627][T10053] __vfs_write+0x8a/0x110 [ 95.539639][T10053] ? put_tty_driver+0x20/0x20 [ 95.539652][T10053] vfs_write+0x268/0x5d0 [ 95.539666][T10053] ksys_write+0x14f/0x290 [ 95.539678][T10053] ? __ia32_sys_read+0xb0/0xb0 [ 95.539694][T10053] ? do_syscall_64+0x26/0x790 [ 95.539707][T10053] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 95.539720][T10053] ? do_syscall_64+0x26/0x790 [ 95.539736][T10053] __x64_sys_write+0x73/0xb0 [ 95.539752][T10053] do_syscall_64+0xfa/0x790 [ 95.539769][T10053] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 95.539778][T10053] RIP: 0033:0x4404f9 [ 95.539792][T10053] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 95.539799][T10053] RSP: 002b:00007ffc9f4da298 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 95.539813][T10053] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9 [ 95.539821][T10053] RDX: 0000000000000078 RSI: 0000000020000000 RDI: 0000000000000004 [ 95.539829][T10053] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 95.539837][T10053] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0 [ 95.539845][T10053] R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 [ 95.539856][T10053] Modules linked in: [ 95.539867][T10053] CR2: 000000010000000e [ 95.539881][T10053] ---[ end trace 1c15f7f9e861311f ]--- [ 95.539898][T10053] RIP: 0010:do_con_trol+0x47ea/0x61b0 [ 95.539912][T10053] Code: 08 2c 01 0f 8e b1 00 00 00 4c 8b bd 08 ff ff ff 48 63 db 44 89 e9 41 0f b7 84 24 c8 03 00 00 48 01 db d1 e9 49 01 df 4c 89 ff 66 ab 49 8d bc 24 78 04 00 00 b8 ff ff 37 00 48 89 fa 48 c1 e0 [ 95.539919][T10053] RSP: 0018:ffffc90001f278b0 EFLAGS: 00010202 [ 95.539930][T10053] RAX: 0000000000000720 RBX: 0000000000000000 RCX: 0000000000000001 [ 95.539939][T10053] RDX: 1ffff11012ed1679 RSI: ffffffff83ed594d RDI: 000000010000000e [ 95.539948][T10053] RBP: ffffc90001f279d0 R08: ffff8880985e2040 R09: ffff8880985e28d0 [ 95.539957][T10053] R10: fffffbfff14f69d0 R11: ffffffff8a7b4e87 R12: ffff88809768b000 [ 95.539965][T10053] R13: 0000000000000002 R14: 0000000000000001 R15: 000000010000000e [ 95.539976][T10053] FS: 0000000001708880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 95.539985][T10053] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 95.539993][T10053] CR2: 000000010000000e CR3: 00000000a0710000 CR4: 00000000001406f0 [ 95.540004][T10053] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 95.540017][T10053] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 95.540024][T10053] Kernel panic - not syncing: Fatal exception [ 95.541396][T10053] Kernel Offset: disabled [ 96.060707][T10053] Rebooting in 86400 seconds..