[syzbot] [ocfs2?] BUG: unable to handle kernel paging request in ocfs2_unlock_and_free_folios

[syzbot <syzbot+c2ea94ae47cd7e3881ec@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    2c4a1f3fe03e Merge tag 'bpf-fixes' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1422ee0c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c07f08ee4bcfb276
dashboard link: https://syzkaller.appspot.com/bug?extid=c2ea94ae47cd7e3881ec
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13ede60c580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15aab682580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-2c4a1f3f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fe90e2ba373e/vmlinux-2c4a1f3f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fdd4ddecb119/bzImage-2c4a1f3f.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/77e1eb294850/mount_0.gz
  fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=1727a10c580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c2ea94ae47cd7e3881ec@syzkaller.appspotmail.com

R10: 0000000000000001 R11: 0000000000000246 R12: 0000200000000180
R13: 00007ffd0a9a15d0 R14: 431bde82d7b634db R15: 00007f06760c301d
 </TASK>
(syz-executor335,5312,0):ocfs2_grab_folios_for_write:1073 ERROR: status = -12
(syz-executor335,5312,0):ocfs2_write_begin_nolock:1791 ERROR: status = -12
BUG: unable to handle page fault for address: fffffffffffffffc
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD df3d067 P4D df3d067 PUD df3f067 PMD 0 
Oops: Oops: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5312 Comm: syz-executor335 Not tainted 6.16.0-rc1-syzkaller-00010-g2c4a1f3fe03e #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:const_folio_flags include/linux/page-flags.h:347 [inline]
RIP: 0010:folio_test_locked include/linux/page-flags.h:547 [inline]
RIP: 0010:folio_unlock+0x3a/0x160 mm/filemap.c:1498
Code: fb 49 bf 00 00 00 00 00 fc ff df e8 20 df c8 ff 4c 8d 73 08 4d 89 f4 49 c1 ec 03 43 80 3c 3c 00 74 08 4c 89 f7 e8 76 56 2c 00 <4d> 8b 2e 4c 89 ee 48 83 e6 01 31 ff e8 d5 e3 c8 ff 49 83 e5 01 0f
RSP: 0018:ffffc9000d517128 EFLAGS: 00010246
RAX: ffffffff81f77fd0 RBX: fffffffffffffff4 RCX: ffff8880007fc880
RDX: 0000000000000000 RSI: 0000000000000001 RDI: fffffffffffffff4
RBP: 0000000000000001 R08: ffff88803fedc07f R09: 1ffff11007fdb80f
R10: dffffc0000000000 R11: ffffed1007fdb810 R12: 1fffffffffffffff
R13: 0000000000000000 R14: fffffffffffffffc R15: dffffc0000000000
FS:  000055557d696380(0000) GS:ffff88808d252000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffffc CR3: 0000000042b50000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ocfs2_unlock_and_free_folios+0x71/0x1a0 fs/ocfs2/aops.c:765
 ocfs2_free_write_ctxt fs/ocfs2/aops.c:813 [inline]
 ocfs2_write_begin_nolock+0x3078/0x4340 fs/ocfs2/aops.c:1830
 ocfs2_write_begin+0x1bb/0x310 fs/ocfs2/aops.c:1882
 generic_perform_write+0x2c4/0x910 mm/filemap.c:4112
 ocfs2_file_write_iter+0x157a/0x1d10 fs/ocfs2/file.c:2469
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x548/0xa90 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0676081af9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 1a 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:00007ffd0a9a1498 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffd0a9a14c0 RCX: 00007f0676081af9
RDX: 00000000fffffec6 RSI: 0000200000000180 RDI: 0000000000000005
RBP: 0000000000000001 R08: 00007ffd0a9a1237 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000200000000180
R13: 00007ffd0a9a15d0 R14: 431bde82d7b634db R15: 00007f06760c301d
 </TASK>
Modules linked in:
CR2: fffffffffffffffc
---[ end trace 0000000000000000 ]---
RIP: 0010:const_folio_flags include/linux/page-flags.h:347 [inline]
RIP: 0010:folio_test_locked include/linux/page-flags.h:547 [inline]
RIP: 0010:folio_unlock+0x3a/0x160 mm/filemap.c:1498
Code: fb 49 bf 00 00 00 00 00 fc ff df e8 20 df c8 ff 4c 8d 73 08 4d 89 f4 49 c1 ec 03 43 80 3c 3c 00 74 08 4c 89 f7 e8 76 56 2c 00 <4d> 8b 2e 4c 89 ee 48 83 e6 01 31 ff e8 d5 e3 c8 ff 49 83 e5 01 0f
RSP: 0018:ffffc9000d517128 EFLAGS: 00010246
RAX: ffffffff81f77fd0 RBX: fffffffffffffff4 RCX: ffff8880007fc880
RDX: 0000000000000000 RSI: 0000000000000001 RDI: fffffffffffffff4
RBP: 0000000000000001 R08: ffff88803fedc07f R09: 1ffff11007fdb80f
R10: dffffc0000000000 R11: ffffed1007fdb810 R12: 1fffffffffffffff
R13: 0000000000000000 R14: fffffffffffffffc R15: dffffc0000000000
FS:  000055557d696380(0000) GS:ffff88808d252000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffffc CR3: 0000000042b50000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	fb                   	sti
   1:	49 bf 00 00 00 00 00 	movabs $0xdffffc0000000000,%r15
   8:	fc ff df
   b:	e8 20 df c8 ff       	call   0xffc8df30
  10:	4c 8d 73 08          	lea    0x8(%rbx),%r14
  14:	4d 89 f4             	mov    %r14,%r12
  17:	49 c1 ec 03          	shr    $0x3,%r12
  1b:	43 80 3c 3c 00       	cmpb   $0x0,(%r12,%r15,1)
  20:	74 08                	je     0x2a
  22:	4c 89 f7             	mov    %r14,%rdi
  25:	e8 76 56 2c 00       	call   0x2c56a0
* 2a:	4d 8b 2e             	mov    (%r14),%r13 <-- trapping instruction
  2d:	4c 89 ee             	mov    %r13,%rsi
  30:	48 83 e6 01          	and    $0x1,%rsi
  34:	31 ff                	xor    %edi,%edi
  36:	e8 d5 e3 c8 ff       	call   0xffc8e410
  3b:	49 83 e5 01          	and    $0x1,%r13
  3f:	0f                   	.byte 0xf


---
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