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BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
BUG: KASAN: null-ptr-deref in atomic_inc include/linux/atomic/atomic-instrumented.h:190 [inline]
BUG: KASAN: null-ptr-deref in xfs_filestream_pick_ag fs/xfs/xfs_filestream.c:156 [inline]
BUG: KASAN: null-ptr-deref in xfs_filestream_create_association fs/xfs/xfs_filestream.c:301 [inline]
BUG: KASAN: null-ptr-deref in xfs_filestream_select_ag+0x14e5/0x1ca0 fs/xfs/xfs_filestream.c:372
Write of size 4 at addr 00000000000001c0 by task syz-executor.4/14678

CPU: 1 PID: 14678 Comm: syz-executor.4 Not tainted 6.4.0-rc1-syzkaller-00109-gcc3c44c9fda2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_report+0xe6/0x540 mm/kasan/report.c:465
 kasan_report+0x176/0x1b0 mm/kasan/report.c:572
 kasan_check_range+0x283/0x290 mm/kasan/generic.c:187
 instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
 atomic_inc include/linux/atomic/atomic-instrumented.h:190 [inline]
 xfs_filestream_pick_ag fs/xfs/xfs_filestream.c:156 [inline]
 xfs_filestream_create_association fs/xfs/xfs_filestream.c:301 [inline]
 xfs_filestream_select_ag+0x14e5/0x1ca0 fs/xfs/xfs_filestream.c:372
 xfs_bmap_btalloc_filestreams fs/xfs/libxfs/xfs_bmap.c:3593 [inline]
 xfs_bmap_btalloc+0xffa/0x28a0 fs/xfs/libxfs/xfs_bmap.c:3707
 xfs_bmapi_allocate+0x647/0xf30
 xfs_bmapi_write+0xa1d/0x1980 fs/xfs/libxfs/xfs_bmap.c:4433
 xfs_alloc_file_space+0x5bb/0xb60 fs/xfs/xfs_bmap_util.c:873
 xfs_file_fallocate+0x9ae/0xd50 fs/xfs/xfs_file.c:1038
 vfs_fallocate+0x54b/0x6b0 fs/open.c:324
 ksys_fallocate fs/open.c:347 [inline]
 __do_sys_fallocate fs/open.c:355 [inline]
 __se_sys_fallocate fs/open.c:353 [inline]
 __x64_sys_fallocate+0xbd/0x100 fs/open.c:353
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f605d68c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f605e32d168 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f605d7abf80 RCX: 00007f605d68c169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f605d6e7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000ff7fff R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcf4e1ed7f R14: 00007f605e32d300 R15: 0000000000022000
 </TASK>
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