Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]
CPU: 0 UID: 0 PID: 5339 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:f2fs_dev_is_alloc_blocked fs/f2fs/segment.h:956 [inline]
RIP: 0010:get_new_segment fs/f2fs/segment.c:2964 [inline]
RIP: 0010:new_curseg+0x1134/0x3580 fs/f2fs/segment.c:3110
Code: e8 11 92 cd fd 48 8b 7c 24 30 48 8b 07 49 6b cf 70 4c 8d 34 08 49 83 c6 61 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 73 11 00 00 41 80 3e 00 0f 84 e6 00 00 00
RSP: 0018:ffffc9000db96e28 EFLAGS: 00010206
RAX: 000000000000000c RBX: 0000000000008000 RCX: dffffc0000000000
RDX: ffffc90020001000 RSI: 00000000000fffff RDI: ffff888013479a88
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001b72db4 R12: ffff888041008000
R13: 0000000000000004 R14: 0000000000000061 R15: 0000000000000000
FS:  00007f177592b6c0(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563f1590f0c8 CR3: 0000000034b02000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 f2fs_allocate_data_block+0x229c/0x43c0 fs/f2fs/segment.c:3979
 do_write_page+0x13f/0x880 fs/f2fs/segment.c:4099
 f2fs_outplace_write_data+0x11a/0x220 fs/f2fs/segment.c:4175
 f2fs_write_compressed_pages fs/f2fs/compress.c:1403 [inline]
 f2fs_write_multi_pages+0x43bb/0x6370 fs/f2fs/compress.c:1602
 f2fs_write_cache_pages fs/f2fs/data.c:3351 [inline]
 __f2fs_write_data_pages fs/f2fs/data.c:3603 [inline]
 f2fs_write_data_pages+0x19bb/0x36f0 fs/f2fs/data.c:3641
 do_writepages+0x338/0x560 mm/page-writeback.c:2560
 filemap_writeback mm/filemap.c:387 [inline]
 filemap_flush_range+0x1e7/0x2f0 mm/filemap.c:436
 generic_fadvise+0x52f/0x760 mm/fadvise.c:114
 f2fs_file_fadvise+0x1cf/0xca0 fs/f2fs/file.c:5763
 vfs_fadvise mm/fadvise.c:182 [inline]
 ksys_fadvise64_64 mm/fadvise.c:197 [inline]
 __do_sys_fadvise64 mm/fadvise.c:209 [inline]
 __se_sys_fadvise64 mm/fadvise.c:207 [inline]
 __x64_sys_fadvise64+0x11f/0x190 mm/fadvise.c:207
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f177499e559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f177592afe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000dd
RAX: ffffffffffffffda RBX: 00007f1774c26090 RCX: 00007f177499e559
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000006
RBP: 00007f1774a35b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1774c26128 R14: 00007f1774c26090 R15: 00007fff513a31a8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:f2fs_dev_is_alloc_blocked fs/f2fs/segment.h:956 [inline]
RIP: 0010:get_new_segment fs/f2fs/segment.c:2964 [inline]
RIP: 0010:new_curseg+0x1134/0x3580 fs/f2fs/segment.c:3110
Code: e8 11 92 cd fd 48 8b 7c 24 30 48 8b 07 49 6b cf 70 4c 8d 34 08 49 83 c6 61 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 73 11 00 00 41 80 3e 00 0f 84 e6 00 00 00
RSP: 0018:ffffc9000db96e28 EFLAGS: 00010206
RAX: 000000000000000c RBX: 0000000000008000 RCX: dffffc0000000000
RDX: ffffc90020001000 RSI: 00000000000fffff RDI: ffff888013479a88
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001b72db4 R12: ffff888041008000
R13: 0000000000000004 R14: 0000000000000061 R15: 0000000000000000
FS:  00007f177592b6c0(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563f1590f0c8 CR3: 0000000034b02000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	e8 11 92 cd fd       	call   0xfdcd9216
   5:	48 8b 7c 24 30       	mov    0x30(%rsp),%rdi
   a:	48 8b 07             	mov    (%rdi),%rax
   d:	49 6b cf 70          	imul   $0x70,%r15,%rcx
  11:	4c 8d 34 08          	lea    (%rax,%rcx,1),%r14
  15:	49 83 c6 61          	add    $0x61,%r14
  19:	4c 89 f0             	mov    %r14,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 73 11 00 00    	jne    0x11a9
  36:	41 80 3e 00          	cmpb   $0x0,(%r14)
  3a:	0f 84 e6 00 00 00    	je     0x126