==================================================================
BUG: KASAN: stack-out-of-bounds in should_fault_in_pages fs/gfs2/file.c:785 [inline]
BUG: KASAN: stack-out-of-bounds in gfs2_file_buffered_write+0x576/0x900 fs/gfs2/file.c:1070
Read of size 8 at addr ffffc90003a57350 by task syz.0.131/4755

CPU: 1 PID: 4755 Comm: syz.0.131 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 print_address_description+0x60/0x2d0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xdf/0x130 mm/kasan/report.c:451
 should_fault_in_pages fs/gfs2/file.c:785 [inline]
 gfs2_file_buffered_write+0x576/0x900 fs/gfs2/file.c:1070
 gfs2_file_write_iter+0x467/0x11d0 fs/gfs2/file.c:1166
 __kernel_write+0x4f9/0x930 fs/read_write.c:539
 __dump_emit+0x243/0x360 fs/coredump.c:943
 elf_core_dump+0x27b4/0x3530 fs/binfmt_elf.c:2237
 do_coredump+0x1419/0x2960 fs/coredump.c:894
 get_signal+0x40a/0x12c0 kernel/signal.c:2886
 arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:320
 exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1504
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 002b:0000200000000008 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fa68300afa0 RCX: 00007fa682db3fc9
RDX: 00002000000000c0 RSI: 0000200000000000 RDI: 0000000080000000
RBP: 00007fa682e36f91 R08: 0000200000000200 R09: 0000200000000200
R10: 0000200000000100 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fa68300b038 R14: 00007fa68300afa0 R15: 00007ffc4963ff08
 </TASK>


addr ffffc90003a57350 is located in stack of task syz.0.131/4755 at offset 48 in frame:
 __kernel_write+0x0/0x930

this frame has 3 objects:
 [32, 48) 'iov'
 [64, 112) 'kiocb'
 [144, 184) 'iter'

Memory state around the buggy address:
 ffffc90003a57200: 00 00 00 00 00 00 00 f3 f3 f3 f3 f3 00 00 00 00
 ffffc90003a57280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc90003a57300: 00 00 00 00 f1 f1 f1 f1 00 00 f2 f2 00 00 00 00
                                                 ^
 ffffc90003a57380: 00 00 f2 f2 f2 f2 00 00 00 00 00 f3 f3 f3 f3 f3
 ffffc90003a57400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================