==================================================================
BUG: KASAN: null-ptr-deref in xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:225 [inline]
BUG: KASAN: null-ptr-deref in xlog_cil_commit+0x254/0x1b7c fs/xfs/xfs_log_cil.c:1264
Write of size 88 at addr 0000000000000000 by task syz.3.189/4917

CPU: 0 PID: 4917 Comm: syz.3.189 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 __kasan_report mm/kasan/report.c:438 [inline]
 kasan_report+0xe0/0x15c mm/kasan/report.c:451
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x270/0x2b0 mm/kasan/generic.c:189
 memset+0x58/0x88 mm/kasan/shadow.c:44
 xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:225 [inline]
 xlog_cil_commit+0x254/0x1b7c fs/xfs/xfs_log_cil.c:1264
 __xfs_trans_commit+0x628/0xcd4 fs/xfs/xfs_trans.c:881
 xfs_trans_commit+0x24/0x34 fs/xfs/xfs_trans.c:925
 xfs_vn_update_time+0x378/0x570 fs/xfs/xfs_iops.c:1072
 inode_update_time fs/inode.c:1893 [inline]
 file_update_time+0x2fc/0x390 fs/inode.c:2083
 file_modified+0x74/0xb4 fs/inode.c:2106
 generic_remap_file_range_prep+0x884/0x918 fs/remap_range.c:358
 xfs_reflink_remap_prep+0x1fc/0x44c fs/xfs/xfs_reflink.c:1469
 xfs_file_remap_range+0x1f4/0x7fc fs/xfs/xfs_file.c:1161
 vfs_copy_file_range+0xaa0/0x10ec fs/read_write.c:1510
 __do_sys_copy_file_range fs/read_write.c:1588 [inline]
 __se_sys_copy_file_range fs/read_write.c:1551 [inline]
 __arm64_sys_copy_file_range+0x534/0x8c8 fs/read_write.c:1551
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
==================================================================
Unable to handle kernel paging request at virtual address dfff800000000003
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000003] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4917 Comm: syz.3.189 Tainted: G    B             5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:227 [inline]
pc : xlog_cil_commit+0x25c/0x1b7c fs/xfs/xfs_log_cil.c:1264
lr : xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:225 [inline]
lr : xlog_cil_commit+0x254/0x1b7c fs/xfs/xfs_log_cil.c:1264
sp : ffff80001feb7400
x29: ffff80001feb7500 x28: 0000000000000150 x27: 0000000000000002
x26: 0000000000000000 x25: ffff0000def986c0 x24: ffff0000def98650
x23: ffff80001feb74a0 x22: 1fffe0001bdf30d8 x21: 0000000000000002
x20: ffff0000def98640 x19: dfff800000000000 x18: 0000000000000002
x17: 0000000040000000 x16: ffff8000082d6448 x15: 0000000000000002
x14: 0000000000ff0100 x13: ffffffffffffffff x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000
x8 : 0000000000000003 x7 : 0000000000000000 x6 : ffff80000824599c
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800008185e38
x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000018
Call trace:
 xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:227 [inline]
 xlog_cil_commit+0x25c/0x1b7c fs/xfs/xfs_log_cil.c:1264
 __xfs_trans_commit+0x628/0xcd4 fs/xfs/xfs_trans.c:881
 xfs_trans_commit+0x24/0x34 fs/xfs/xfs_trans.c:925
 xfs_vn_update_time+0x378/0x570 fs/xfs/xfs_iops.c:1072
 inode_update_time fs/inode.c:1893 [inline]
 file_update_time+0x2fc/0x390 fs/inode.c:2083
 file_modified+0x74/0xb4 fs/inode.c:2106
 generic_remap_file_range_prep+0x884/0x918 fs/remap_range.c:358
 xfs_reflink_remap_prep+0x1fc/0x44c fs/xfs/xfs_reflink.c:1469
 xfs_file_remap_range+0x1f4/0x7fc fs/xfs/xfs_file.c:1161
 vfs_copy_file_range+0xaa0/0x10ec fs/read_write.c:1510
 __do_sys_copy_file_range fs/read_write.c:1588 [inline]
 __se_sys_copy_file_range fs/read_write.c:1551 [inline]
 __arm64_sys_copy_file_range+0x534/0x8c8 fs/read_write.c:1551
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: 93407d02 97b87ad2 91006340 d343fc08 (38736908) 
---[ end trace 6291ddf46e0574f3 ]---
----------------
Code disassembly (best guess):
   0:	93407d02 	sxtw	x2, w8
   4:	97b87ad2 	bl	0xfffffffffee1eb4c
   8:	91006340 	add	x0, x26, #0x18
   c:	d343fc08 	lsr	x8, x0, #3
* 10:	38736908 	ldrb	w8, [x8, x19] <-- trapping instruction