kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 10313 Comm: syz-executor2 Not tainted 4.20.0-rc7-next-20181224 #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
kobject: 'loop4' (00000000dc5b03a7): kobject_uevent_env
RIP: 0010:transparent_hugepage_enabled+0x8c/0x5e0 mm/huge_memory.c:69
Code: 80 3c 02 00 0f 85 b2 04 00 00 4c 8b a3 a0 00 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 b8 01 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 95 04 00 00 49 8b bc 24 b8 01 00 00 e8 bd 82 e6
RSP: 0018:ffff888059617288 EFLAGS: 00010202
kobject: 'loop4' (00000000dc5b03a7): fill_kobj_path: path = '/devices/virtual/block/loop4'
RAX: dffffc0000000000 RBX: ffff8880a75a3778 RCX: ffffc90009e03000
RDX: 0000000000000037 RSI: ffffffff81c8242a RDI: 00000000000001b8
RBP: ffff8880596172b0 R08: 1ffff1101269d0fc R09: ffffed101269d0fd
R10: ffffed101269d0fc R11: ffff8880934e87e7 R12: 0000000000000000
R13: ffff8880a75a3818 R14: ffffffff88575420 R15: 0000000000000e6c
FS:  00007f7f9653a700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020006038 CR3: 0000000093d2a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
kobject: 'loop4' (00000000dc5b03a7): kobject_uevent_env
Call Trace:
 show_smap+0x179/0x590 fs/proc/task_mmu.c:805
kobject: 'loop4' (00000000dc5b03a7): fill_kobj_path: path = '/devices/virtual/block/loop4'
 seq_read+0xad3/0x1130 fs/seq_file.c:268
 do_loop_readv_writev fs/read_write.c:700 [inline]
 do_loop_readv_writev fs/read_write.c:687 [inline]
 do_iter_read+0x4a9/0x660 fs/read_write.c:924
 vfs_readv+0x175/0x1c0 fs/read_write.c:986
 kernel_readv fs/splice.c:362 [inline]
 default_file_splice_read+0x50c/0xac0 fs/splice.c:417
kobject: 'loop4' (00000000dc5b03a7): kobject_uevent_env
 do_splice_to+0x12a/0x190 fs/splice.c:880
 splice_direct_to_actor+0x31b/0x9d0 fs/splice.c:957
kobject: 'loop4' (00000000dc5b03a7): fill_kobj_path: path = '/devices/virtual/block/loop4'
 do_splice_direct+0x2c7/0x420 fs/splice.c:1066
 do_sendfile+0x61a/0xe60 fs/read_write.c:1439
 __do_sys_sendfile64 fs/read_write.c:1500 [inline]
 __se_sys_sendfile64 fs/read_write.c:1486 [inline]
 __x64_sys_sendfile64+0x1f8/0x240 fs/read_write.c:1486
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457ec9
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
kobject: 'loop4' (00000000dc5b03a7): kobject_uevent_env
RSP: 002b:00007f7f96539c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
kobject: 'loop4' (00000000dc5b03a7): fill_kobj_path: path = '/devices/virtual/block/loop4'
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457ec9
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000004000088001 R11: 0000000000000246 R12: 00007f7f9653a6d4
R13: 00000000004c4b6b R14: 00000000004d8278 R15: 00000000ffffffff
Modules linked in:
kobject: 'loop3' (0000000057aa8151): kobject_uevent_env
kobject: 'loop3' (0000000057aa8151): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop4' (00000000dc5b03a7): kobject_uevent_env
kobject: 'loop4' (00000000dc5b03a7): fill_kobj_path: path = '/devices/virtual/block/loop4'
---[ end trace 5bd933fc06e83c5b ]---
kobject: 'loop1' (00000000fcf98ff7): kobject_uevent_env
RIP: 0010:transparent_hugepage_enabled+0x8c/0x5e0 mm/huge_memory.c:69
Code: 80 3c 02 00 0f 85 b2 04 00 00 4c 8b a3 a0 00 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 b8 01 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 95 04 00 00 49 8b bc 24 b8 01 00 00 e8 bd 82 e6
RSP: 0018:ffff888059617288 EFLAGS: 00010202
kobject: 'loop1' (00000000fcf98ff7): fill_kobj_path: path = '/devices/virtual/block/loop1'
RAX: dffffc0000000000 RBX: ffff8880a75a3778 RCX: ffffc90009e03000
RDX: 0000000000000037 RSI: ffffffff81c8242a RDI: 00000000000001b8
RBP: ffff8880596172b0 R08: 1ffff1101269d0fc R09: ffffed101269d0fd
R10: ffffed101269d0fc R11: ffff8880934e87e7 R12: 0000000000000000
kobject: 'loop5' (00000000f08e7c60): kobject_uevent_env
R13: ffff8880a75a3818 R14: ffffffff88575420 R15: 0000000000000e6c
kobject: 'loop5' (00000000f08e7c60): fill_kobj_path: path = '/devices/virtual/block/loop5'
FS:  00007f7f9653a700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
kobject: 'loop3' (0000000057aa8151): kobject_uevent_env
kobject: 'loop3' (0000000057aa8151): fill_kobj_path: path = '/devices/virtual/block/loop3'
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000012b4d08 CR3: 0000000093d2a000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400