[  OK  ] Started OpenBSD Secure Shell server.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   38.082591] audit: type=1400 audit(1599876358.660:8): avc:  denied  { execmem } for  pid=6460 comm="syz-executor147" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
[   38.096227] overlayfs: upper fs does not support tmpfile.
[   38.108649] overlayfs: upper fs does not support xattr, falling back to index=off and metacopy=off.
[   38.124014] ------------[ cut here ]------------
[   38.128963] kernel BUG at mm/hugetlb.c:3385!
[   38.133637] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   38.139009] CPU: 1 PID: 6460 Comm: syz-executor147 Not tainted 4.19.144-syzkaller #0
[   38.146869] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   38.156213] RIP: 0010:__unmap_hugepage_range+0x945/0xb10
[   38.161641] Code: 4c 89 e2 e8 9d e4 91 ff 66 90 4c 89 f7 e8 c3 19 a2 05 e9 bc fa ff ff e8 d9 fd cc ff 0f 0b e8 d2 fd cc ff 0f 0b e8 cb fd cc ff <0f> 0b e8 c4 fd cc ff 48 8b 54 24 50 b9 01 00 00 00 48 89 ef 48 8b
[   38.180555] RSP: 0018:ffff888089227a70 EFLAGS: 00010293
[   38.185900] RAX: ffff888088c30400 RBX: ffffffff8b929c30 RCX: ffffffff819cad04
[   38.193171] RDX: 0000000000000000 RSI: ffffffff819cb405 RDI: 0000000000000007
[   38.200416] RBP: ffff8880a8f8f580 R08: 0000000000000000 R09: 0000000000000000
[   38.207753] R10: 0000000000000007 R11: 0000000000000000 R12: 0000000020000000
[   38.215183] R13: 0000000000001000 R14: ffff88809ab39260 R15: 0000000000000000
[   38.222443] FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
[   38.230645] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   38.236504] CR2: 0000561416e1c210 CR3: 000000008e95e000 CR4: 00000000001406e0
[   38.243766] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   38.251009] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   38.258254] Call Trace:
[   38.260826]  ? huge_pte_offset+0x3b0/0x3b0
[   38.265038]  ? lock_acquire+0x170/0x3c0
[   38.268988]  ? unmap_single_vma+0x226/0x300
[   38.273289]  __unmap_hugepage_range_final+0x30/0x70
[   38.278396]  unmap_single_vma+0x23a/0x300
[   38.282698]  unmap_vmas+0xa9/0x180
[   38.286215]  exit_mmap+0x2b9/0x530
[   38.289822]  ? __ia32_sys_remap_file_pages+0x150/0x150
[   38.295092]  ? __khugepaged_exit+0x2a6/0x3e0
[   38.299479]  ? rcu_read_lock_sched_held+0x16c/0x1d0
[   38.304476]  ? kmem_cache_free+0x226/0x260
[   38.308690]  ? __khugepaged_exit+0x2c7/0x3e0
[   38.313082]  mmput+0x14e/0x4a0
[   38.316254]  do_exit+0xab5/0x2b70
[   38.319688]  ? mm_update_next_owner+0x650/0x650
[   38.324338]  ? putname+0xe1/0x120
[   38.327786]  ? fput+0x2b/0x190
[   38.330955]  ? ksys_mmap_pgoff+0x2ad/0x5a0
[   38.335191]  do_group_exit+0x125/0x310
[   38.339073]  __x64_sys_exit_group+0x3a/0x50
[   38.343379]  do_syscall_64+0xf9/0x620
[   38.347179]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   38.352347] RIP: 0033:0x43f088
[   38.355543] Code: Bad RIP value.
[   38.358902] RSP: 002b:00007ffd385a3638 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   38.366592] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f088
[   38.373842] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[   38.381107] RBP: 00000000004be888 R08: 00000000000000e7 R09: ffffffffffffffd0
[   38.388379] R10: 0000000000010012 R11: 0000000000000246 R12: 0000000000000001
[   38.395644] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000
[   38.403106] Modules linked in:
[   38.406821] ---[ end trace aaf6f66c29746148 ]---
[   38.411643] RIP: 0010:__unmap_hugepage_range+0x945/0xb10
[   38.417095] Code: 4c 89 e2 e8 9d e4 91 ff 66 90 4c 89 f7 e8 c3 19 a2 05 e9 bc fa ff ff e8 d9 fd cc ff 0f 0b e8 d2 fd cc ff 0f 0b e8 cb fd cc ff <0f> 0b e8 c4 fd cc ff 48 8b 54 24 50 b9 01 00 00 00 48 89 ef 48 8b
[   38.436141] RSP: 0018:ffff888089227a70 EFLAGS: 00010293
[   38.441560] RAX: ffff888088c30400 RBX: ffffffff8b929c30 RCX: ffffffff819cad04
[   38.448950] RDX: 0000000000000000 RSI: ffffffff819cb405 RDI: 0000000000000007
[   38.456275] RBP: ffff8880a8f8f580 R08: 0000000000000000 R09: 0000000000000000
[   38.463592] R10: 0000000000000007 R11: 0000000000000000 R12: 0000000020000000
[   38.472554] R13: 0000000000001000 R14: ffff88809ab39260 R15: 0000000000000000
[   38.479849] FS:  00000000020d9880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
[   38.488127] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   38.494083] CR2: 000000000043f05e CR3: 000000008e95e000 CR4: 00000000001406e0
[   38.502449] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   38.509858] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   38.518292] Kernel panic - not syncing: Fatal exception
[   38.525035] Kernel Offset: disabled
[   38.528711] Rebooting in 86400 seconds..