F2FS-fs (loop3): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop3): invalid crc value
F2FS-fs (loop3): Found nat_bits in checkpoint
F2FS-fs (loop3): Mounted with checkpoint version = 753bd00b
==================================================================
BUG: KASAN: slab-out-of-bounds in __roll_back_blkaddrs fs/f2fs/file.c:1001 [inline]
BUG: KASAN: slab-out-of-bounds in __exchange_data_block+0x2dbc/0x30a0 fs/f2fs/file.c:1137
Read of size 4 at addr ffff888044cb4e60 by task syz-executor.3/9743

CPU: 1 PID: 9743 Comm: syz-executor.3 Not tainted 4.14.302-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load4_noabort+0x68/0x70 mm/kasan/report.c:429
 __roll_back_blkaddrs fs/f2fs/file.c:1001 [inline]
 __exchange_data_block+0x2dbc/0x30a0 fs/f2fs/file.c:1137
 f2fs_insert_range fs/f2fs/file.c:1404 [inline]
 f2fs_fallocate+0x1368/0x26f0 fs/f2fs/file.c:1501
 vfs_fallocate+0x346/0x790 fs/open.c:319
 SYSC_fallocate fs/open.c:342 [inline]
 SyS_fallocate+0x4a/0x80 fs/open.c:336
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f6e6637d0c9
RSP: 002b:00007f6e648ef168 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f6e6649cf80 RCX: 00007f6e6637d0c9
RDX: 0000000000000000 RSI: 0000000000000020 RDI: 0000000000000005
RBP: 00007f6e663d8ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000ff8000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe78ac8b9f R14: 00007f6e648ef300 R15: 0000000000022000

Allocated by task 9743:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 __do_kmalloc_node mm/slab.c:3682 [inline]
 __kmalloc_node+0x4c/0x70 mm/slab.c:3689
 kmalloc_node include/linux/slab.h:530 [inline]
 kvmalloc_node+0x88/0xd0 mm/util.c:430
 kvmalloc include/linux/mm.h:531 [inline]
 kvzalloc include/linux/mm.h:539 [inline]
 __exchange_data_block+0x132/0x30a0 fs/f2fs/file.c:1111
 f2fs_insert_range fs/f2fs/file.c:1404 [inline]
 f2fs_fallocate+0x1368/0x26f0 fs/f2fs/file.c:1501
 vfs_fallocate+0x346/0x790 fs/open.c:319
 SYSC_fallocate fs/open.c:342 [inline]
 SyS_fallocate+0x4a/0x80 fs/open.c:336
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff888044cb0ec0
 which belongs to the cache kmalloc-16384 of size 16384
The buggy address is located 16288 bytes inside of
 16384-byte region [ffff888044cb0ec0, ffff888044cb4ec0)
The buggy address belongs to the page:
page:ffffea0001132c00 count:1 mapcount:0 mapping:ffff888044cb0ec0 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffff888044cb0ec0 0000000000000000 0000000100000001
raw: ffffea000114d020 ffff88813fe64c48 ffff88813fe65200 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888044cb4d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888044cb4d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888044cb4e00: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
                                                       ^
 ffff888044cb4e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888044cb4f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================