syzbot has found a reproducer for the following issue on:

HEAD commit: 3f86ed6ec0b3 Merge tag 'arc-6.6-rc1' of git://git.kernel.o.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=139ce690680000 kernel config: https://syzkaller.appspot.com/x/.config?x=ff0db7a15ba54ead dashboard link: https://syzkaller.appspot.com/bug?extid=9b82859567f2e50c123e compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b0c620680000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=152da4e7a80000

Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/6f4f710c5033/disk-3f86ed6e.raw.... vmlinux: https://storage.googleapis.com/syzbot-assets/555548fedbdc/vmlinux-3f86ed6e.x... kernel image: https://storage.googleapis.com/syzbot-assets/c06d7c39bbc0/bzImage-3f86ed6e.x... mounted in repro: https://storage.googleapis.com/syzbot-assets/120cc7b707b8/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9b82859567f2e50c123e@syzkaller.appspotmail.com

XFS (loop0): Quotacheck needed: Please wait. XFS (loop0): Quotacheck: Done. ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5030 at mm/gup.c:229 try_grab_page+0x287/0x460 Modules linked in: CPU: 1 PID: 5030 Comm: syz-executor118 Not tainted 6.5.0-syzkaller-11704-g3f86ed6ec0b3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 RIP: 0010:try_grab_page+0x287/0x460 mm/gup.c:229 Code: 01 49 8d 7e 60 be 04 00 00 00 e8 54 41 18 00 f0 41 83 46 60 01 42 80 3c 2b 00 0f 85 6a ff ff ff e9 6d ff ff ff e8 b9 55 be ff <0f> 0b bb f4 ff ff ff eb b6 e8 ab 55 be ff 49 ff ce e9 ca fd ff ff RSP: 0018:ffffc90003a6ee88 EFLAGS: 00010293 RAX: ffffffff81cf4377 RBX: 0000000000000000 RCX: ffff888025da0000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 000000000000000e R08: ffffffff81cf418c R09: 1ffffd400039097e R10: dffffc0000000000 R11: fffff9400039097f R12: ffffea0001c84bf4 R13: dffffc0000000000 R14: ffffea0001c84bc0 R15: ffffea0001c84bc0 FS: 0000555555acb380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020008000 CR3: 00000000736e9000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> follow_page_pte+0x560/0x18f0 mm/gup.c:651 follow_pud_mask mm/gup.c:765 [inline] follow_p4d_mask mm/gup.c:782 [inline] follow_page_mask+0x7dc/0xe20 mm/gup.c:832 __get_user_pages+0x643/0x15e0 mm/gup.c:1237 __get_user_pages_locked mm/gup.c:1504 [inline] get_dump_page+0x146/0x2b0 mm/gup.c:2018 dump_user_range+0x126/0x910 fs/coredump.c:913 elf_core_dump+0x3b75/0x4490 fs/binfmt_elf.c:2142 do_coredump+0x1b73/0x2ab0 fs/coredump.c:764 get_signal+0x145e/0x1840 kernel/signal.c:2878 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fb68edcf0f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 18 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:00007ffc8b18d558 EFLAGS: 00000246 ORIG_RAX: 000000000000004d RAX: ffffffffffffffe5 RBX: 0000000000000003 RCX: 00007fb68edcf0f9 RDX: 0000000000000000 RSI: 0000000100000001 RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000555500000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000f4240 R13: 00007ffc8b18d7c8 R14: 0000000000000001 R15: 00007ffc8b18d590 </TASK>

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