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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 ffffc90003d5f350 by task syz.5.1930/10723

CPU: 0 PID: 10723 Comm: syz.5.1930 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 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+0x497/0x1240 fs/gfs2/file.c:1166
 __kernel_write+0x51c/0x970 fs/read_write.c:539
 __dump_emit+0x249/0x370 fs/coredump.c:943
 elf_core_dump+0x2757/0x3500 fs/binfmt_elf.c:2237
 do_coredump+0x14c7/0x2ac0 fs/coredump.c:894
 get_signal+0x40a/0x12c0 kernel/signal.c:2886
 arch_do_signal_or_restart+0xe7/0x12c0 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:1499
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7f1f832787f7
Code: e8 8e fa ff ff 89 f2 48 8d 3d 8d 40 1b 00 48 8d 35 6c fa 1d 00 31 c0 e8 e7 f8 ff ff 0f 1f 80 00 00 00 00 53 89 fb 48 83 ec 10 <64> 8b 04 25 a4 ff ff ff 85 c0 74 2a 89 fe 31 c0 bf 3c 00 00 00 e8
RSP: 002b:00007ffc8d492120 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 000000000000000b RCX: ffffffffffffffe8
RDX: 00007ffc8d492140 RSI: 00007ffc8d492270 RDI: 000000000000000b
RBP: 0000000000000032 R08: 0031e72b20ecba28 R09: 0000000000000000
R10: 00007ffc8d590f00 R11: 0000000000000246 R12: 00007ffc8d590f20
R13: 00007f1f8363bfac R14: 0000000000093ec8 R15: 00007ffc8d590f00
 </TASK>


addr ffffc90003d5f350 is located in stack of task syz.5.1930/10723 at offset 48 in frame:
 __kernel_write+0x0/0x970

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

Memory state around the buggy address:
 ffffc90003d5f200: 00 00 00 00 00 00 00 f3 f3 f3 f3 f3 00 00 00 00
 ffffc90003d5f280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc90003d5f300: 00 00 00 00 f1 f1 f1 f1 00 00 f2 f2 00 00 00 00
                                                 ^
 ffffc90003d5f380: 00 00 f2 f2 f2 f2 00 00 00 00 00 f3 f3 f3 f3 f3
 ffffc90003d5f400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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