user_path_at_empty+0x2c/0x60 fs/namei.c:2910
 user_path_at include/linux/namei.h:57 [inline]
 ksys_umount fs/namespace.c:1914 [inline]
 __do_sys_umount fs/namespace.c:1922 [inline]
 __se_sys_umount fs/namespace.c:1920 [inline]
 __x64_sys_umount+0x10e/0x1a0 fs/namespace.c:1920
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
------------[ cut here ]------------
kernel BUG at include/linux/page-flags.h:314!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 42 Comm: kcompactd0 Not tainted 6.6.0-rc7-syzkaller-00039-g4f82870119a4 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:folio_flags+0x1b7/0x1f0 include/linux/page-flags.h:314
Code: 06 41 83 e4 01 44 89 e6 e8 06 52 b1 ff 45 84 e4 0f 85 c9 fe ff ff e8 c8 56 b1 ff 48 c7 c6 e0 2f 9a 8a 48 89 ef e8 39 20 ef ff <0f> 0b e8 22 67 06 00 e9 6c fe ff ff 48 89 ef e8 15 67 06 00 eb b7
RSP: 0018:ffffc90000bc78b8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff888013f48bc0 RSI: ffffffff81d581b7 RDI: ffffffff8ae91320
RBP: ffffea000071fa00 R08: 0000000000000000 R09: fffffbfff1d96c42
R10: ffffffff8ecb6217 R11: 0000000000000000 R12: 0000000000000000
R13: ffffea000071f9c0 R14: ffffea000071fa00 R15: 000000000001c7e8
FS:  0000000000000000(0000) GS:ffff88806b700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb2d4b75198 CR3: 0000000022b72000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 folio_test_hugetlb include/linux/page-flags.h:835 [inline]
 PageHuge+0x215/0x2b0 mm/hugetlb.c:2082
 isolate_migratepages_block+0x61b/0x4a40 mm/compaction.c:950
 isolate_migratepages mm/compaction.c:2053 [inline]
 compact_zone+0x18f6/0x4020 mm/compaction.c:2491
 proactive_compact_node+0x118/0x1d0 mm/compaction.c:2780
 kcompactd+0x710/0xd80 mm/compaction.c:3100
 kthread+0x33c/0x440 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:folio_flags+0x1b7/0x1f0 include/linux/page-flags.h:314
Code: 06 41 83 e4 01 44 89 e6 e8 06 52 b1 ff 45 84 e4 0f 85 c9 fe ff ff e8 c8 56 b1 ff 48 c7 c6 e0 2f 9a 8a 48 89 ef e8 39 20 ef ff <0f> 0b e8 22 67 06 00 e9 6c fe ff ff 48 89 ef e8 15 67 06 00 eb b7
RSP: 0018:ffffc90000bc78b8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff888013f48bc0 RSI: ffffffff81d581b7 RDI: ffffffff8ae91320
RBP: ffffea000071fa00 R08: 0000000000000000 R09: fffffbfff1d96c42
R10: ffffffff8ecb6217 R11: 0000000000000000 R12: 0000000000000000
R13: ffffea000071f9c0 R14: ffffea000071fa00 R15: 000000000001c7e8
FS:  0000000000000000(0000) GS:ffff88806b600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000004663e000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400