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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+0x4bc/0x880 fs/gfs2/file.c:1070
Read of size 8 at addr ffff80001f747170 by task syz.1.74/4526

CPU: 0 PID: 4526 Comm: syz.1.74 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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
 print_address_description+0x78/0x30c mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xec/0x15c mm/kasan/report.c:451
 __asan_report_load8_noabort+0x44/0x50 mm/kasan/report_generic.c:309
 should_fault_in_pages fs/gfs2/file.c:785 [inline]
 gfs2_file_buffered_write+0x4bc/0x880 fs/gfs2/file.c:1070
 gfs2_file_write_iter+0x39c/0xbd8 fs/gfs2/file.c:1166
 __kernel_write+0x3e8/0x7ac fs/read_write.c:539
 __dump_emit+0x1dc/0x2fc fs/coredump.c:943
 dump_emit+0x288/0x364 fs/coredump.c:980
 elf_core_dump+0x2044/0x2bac fs/binfmt_elf.c:2237
 do_coredump+0x14e4/0x2240 fs/coredump.c:894
 get_signal+0x4f4/0x1340 kernel/signal.c:2886
 do_signal arch/arm64/kernel/signal.c:893 [inline]
 do_notify_resume+0x35c/0x3128 arch/arm64/kernel/signal.c:946
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline]
 el0_svc+0xf0/0x1e0 arch/arm64/kernel/entry-common.c:609
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584


addr ffff80001f747170 is located in stack of task syz.1.74/4526 at offset 48 in frame:
 new_sync_read fs/read_write.c:405 [inline]
 __kernel_write+0x0/0x7ac fs/read_write.c:485

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

Memory state around the buggy address:
 ffff80001f747000: f1 f1 f1 f1 00 00 00 00 00 00 00 f3 f3 f3 f3 f3
 ffff80001f747080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff80001f747100: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 f2 f2
                                                             ^
 ffff80001f747180: 00 00 00 00 00 00 f2 f2 f2 f2 00 00 00 00 00 f3
 ffff80001f747200: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
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