BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 91cec067 P4D 91cec067 PUD 8a8b2067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 19282 Comm: syz-executor.1 Not tainted 5.3.0-rc6 #127
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff88805b6b75b8 EFLAGS: 00010246
RAX: ffffffff879c54c0 RBX: dffffc0000000000 RCX: ffffc9000815e000
RDX: 1ffffffff0f38a99 RSI: ffffea0001cfd640 RDI: ffff888097248500
RBP: ffff88805b6b76e8 R08: ffff8880507c2500 R09: fffff9400039fac9
R10: fffff9400039fac8 R11: ffffea0001cfd647 R12: ffffea0001cfd648
R13: ffffea0001cfd640 R14: ffffea0001cfd650 R15: 0000000000000000
FS:  00007f39fb12c700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000a19e1000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 read_pages+0x352/0x540 mm/readahead.c:136
 __do_page_cache_readahead+0x4e0/0x5d0 mm/readahead.c:212
 ra_submit mm/internal.h:62 [inline]
 ondemand_readahead+0x561/0xd40 mm/readahead.c:492
 page_cache_sync_readahead mm/readahead.c:527 [inline]
 page_cache_sync_readahead+0x281/0x520 mm/readahead.c:509
 generic_file_buffered_read mm/filemap.c:2071 [inline]
 generic_file_read_iter+0x10f1/0x1ce0 mm/filemap.c:2344
 ext4_file_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0x1d6/0x420 fs/ext4/file.c:65
 call_read_iter include/linux/fs.h:1864 [inline]
 generic_file_splice_read+0x4af/0x800 fs/splice.c:307
 do_splice_to+0x127/0x180 fs/splice.c:877
 splice_direct_to_actor+0x2d2/0x970 fs/splice.c:954
 do_splice_direct+0x1da/0x2a0 fs/splice.c:1063
 do_sendfile+0x597/0xd00 fs/read_write.c:1464
 __do_sys_sendfile64 fs/read_write.c:1525 [inline]
 __se_sys_sendfile64 fs/read_write.c:1511 [inline]
 __x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1511
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459879
Code: fd 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f39fb12bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459879
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000020000000ffe R11: 0000000000000246 R12: 00007f39fb12c6d4
R13: 00000000004c7065 R14: 00000000004dc6d0 R15: 00000000ffffffff
Modules linked in:
CR2: 0000000000000000
---[ end trace 0e10cc5a1c1997ea ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff88805b6b75b8 EFLAGS: 00010246
RAX: ffffffff879c54c0 RBX: dffffc0000000000 RCX: ffffc9000815e000
RDX: 1ffffffff0f38a99 RSI: ffffea0001cfd640 RDI: ffff888097248500
RBP: ffff88805b6b76e8 R08: ffff8880507c2500 R09: fffff9400039fac9
R10: fffff9400039fac8 R11: ffffea0001cfd647 R12: ffffea0001cfd648
R13: ffffea0001cfd640 R14: ffffea0001cfd650 R15: 0000000000000000
FS:  00007f39fb12c700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000758080 CR3: 00000000a19e1000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400