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BUG: unable to handle kernel paging request in folio_unlock

Status: upstream: reported C repro on 2025/01/31 20:55
Subsystems: ocfs2
[Documentation on labels]
Reported-by: syzbot+2d57a8e099fe62bd60f0@syzkaller.appspotmail.com
First crash: 57d, last: 7h03m
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ocfs2?] BUG: unable to handle kernel paging request in folio_unlock 0 (2) 2025/02/02 05:08

Sample crash report:
R13: 00007fff1f775058 R14: 431bde82d7b634db R15: 00007fe1ac9c701d
 </TASK>
(syz-executor147,5303,0):ocfs2_grab_folios_for_write:1080 ERROR: status = -12
(syz-executor147,5303,0):ocfs2_write_begin_nolock:1798 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 e73c067 P4D e73c067 PUD e73e067 PMD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5303 Comm: syz-executor147 Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0
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:310 [inline]
RIP: 0010:folio_test_locked include/linux/page-flags.h:510 [inline]
RIP: 0010:folio_unlock+0x3b/0x170 mm/filemap.c:1499
Code: 49 bf 00 00 00 00 00 fc ff df e8 b0 56 c7 ff 4d 8d 66 08 4d 89 e5 49 c1 ed 03 43 80 7c 3d 00 00 74 08 4c 89 e7 e8 95 eb 2d 00 <49> 8b 1c 24 48 89 de 48 83 e6 01 31 ff e8 63 5b c7 ff 48 83 e3 01
RSP: 0018:ffffc9000d327128 EFLAGS: 00010246
RAX: ffffffff81f81610 RBX: 1ffff1100232e806 RCX: ffff88801ce4a440
RDX: 0000000000000000 RSI: 0000000000000001 RDI: fffffffffffffff4
RBP: ffff888011974030 R08: ffffffff83ad8572 R09: 1ffffffff203680e
R10: dffffc0000000000 R11: fffffbfff203680f R12: fffffffffffffffc
R13: 1fffffffffffffff R14: fffffffffffffff4 R15: dffffc0000000000
FS:  00005555865c0380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffffc CR3: 0000000041da6000 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:772
 ocfs2_free_write_ctxt fs/ocfs2/aops.c:820 [inline]
 ocfs2_write_begin_nolock+0x3908/0x4e40 fs/ocfs2/aops.c:1837
 ocfs2_write_begin+0x205/0x3a0 fs/ocfs2/aops.c:1889
 generic_perform_write+0x346/0x990 mm/filemap.c:4189
 ocfs2_file_write_iter+0x19af/0x2180 fs/ocfs2/file.c:2469
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xacf/0xd10 fs/read_write.c:679
 ksys_write+0x18f/0x2b0 fs/read_write.c:731
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe1ac985889
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:00007fff1f774df8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fff1f774e10 RCX: 00007fe1ac985889
RDX: 00000000ffffff6a RSI: 0000000020000000 RDI: 0000000000000004
RBP: 0000000000000001 R08: 00007fff1f774b97 R09: 00005555865c1378
R10: 0000000000000001 R11: 0000000000000246 R12: 00007fff1f774e30
R13: 00007fff1f775058 R14: 431bde82d7b634db R15: 00007fe1ac9c701d
 </TASK>
Modules linked in:
CR2: fffffffffffffffc
---[ end trace 0000000000000000 ]---
RIP: 0010:const_folio_flags include/linux/page-flags.h:310 [inline]
RIP: 0010:folio_test_locked include/linux/page-flags.h:510 [inline]
RIP: 0010:folio_unlock+0x3b/0x170 mm/filemap.c:1499
Code: 49 bf 00 00 00 00 00 fc ff df e8 b0 56 c7 ff 4d 8d 66 08 4d 89 e5 49 c1 ed 03 43 80 7c 3d 00 00 74 08 4c 89 e7 e8 95 eb 2d 00 <49> 8b 1c 24 48 89 de 48 83 e6 01 31 ff e8 63 5b c7 ff 48 83 e3 01
RSP: 0018:ffffc9000d327128 EFLAGS: 00010246
RAX: ffffffff81f81610 RBX: 1ffff1100232e806 RCX: ffff88801ce4a440
RDX: 0000000000000000 RSI: 0000000000000001 RDI: fffffffffffffff4
RBP: ffff888011974030 R08: ffffffff83ad8572 R09: 1ffffffff203680e
R10: dffffc0000000000 R11: fffffbfff203680f R12: fffffffffffffffc
R13: 1fffffffffffffff R14: fffffffffffffff4 R15: dffffc0000000000
FS:  00005555865c0380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffffc CR3: 0000000041da6000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	49 bf 00 00 00 00 00 	movabs $0xdffffc0000000000,%r15
   7:	fc ff df
   a:	e8 b0 56 c7 ff       	call   0xffc756bf
   f:	4d 8d 66 08          	lea    0x8(%r14),%r12
  13:	4d 89 e5             	mov    %r12,%r13
  16:	49 c1 ed 03          	shr    $0x3,%r13
  1a:	43 80 7c 3d 00 00    	cmpb   $0x0,0x0(%r13,%r15,1)
  20:	74 08                	je     0x2a
  22:	4c 89 e7             	mov    %r12,%rdi
  25:	e8 95 eb 2d 00       	call   0x2debbf
* 2a:	49 8b 1c 24          	mov    (%r12),%rbx <-- trapping instruction
  2e:	48 89 de             	mov    %rbx,%rsi
  31:	48 83 e6 01          	and    $0x1,%rsi
  35:	31 ff                	xor    %edi,%edi
  37:	e8 63 5b c7 ff       	call   0xffc75b9f
  3c:	48 83 e3 01          	and    $0x1,%rbx

Crashes (175):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/02 05:08 upstream 69e858e0b8b2 568559e4 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/10 23:52 upstream 4d872d51bc9d 16256247 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs BUG: unable to handle kernel paging request in folio_unlock
2025/03/26 06:50 upstream 2df0c02dab82 89d30d73 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/26 02:30 upstream 2df0c02dab82 89d30d73 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/25 22:09 upstream 2df0c02dab82 89d30d73 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/25 15:29 upstream 2f2d52945852 875573af .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/25 03:41 upstream 38fec10eb60d 875573af .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/24 20:56 upstream 38fec10eb60d 875573af .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/24 11:49 upstream 586de92313fc 875573af .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/23 18:33 upstream 586de92313fc 4e8d3850 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/23 04:44 upstream 183601b78a9b 4e8d3850 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/22 14:05 upstream 88d324e69ea9 c6512ef7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/22 03:49 upstream d07de43e3f05 c6512ef7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/21 21:12 upstream d07de43e3f05 c6512ef7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/20 19:57 upstream 5fc319360819 62330552 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/20 13:49 upstream a7f2e10ecd8f 62330552 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/20 10:32 upstream a7f2e10ecd8f 62330552 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/20 04:21 upstream a7f2e10ecd8f 8d0a2921 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/19 00:32 upstream 76b6905c11fd 22a6c2b1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/18 19:17 upstream 76b6905c11fd 22a6c2b1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/18 10:07 upstream fc444ada1310 ce3352cd .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/18 06:50 upstream fc444ada1310 ce3352cd .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/17 18:50 upstream 4701f33a1070 489e2dc8 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/16 17:57 upstream cb82ca153949 e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/16 10:11 upstream eb88e6bfbc0a e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/16 03:19 upstream eb88e6bfbc0a e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/15 03:27 upstream 83158b21ae9a e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/15 02:02 upstream 83158b21ae9a e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/15 01:10 upstream 83158b21ae9a e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/14 04:48 upstream 4003c9e78778 e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/14 00:34 upstream 4003c9e78778 e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/13 00:01 upstream 0fed89a961ea 1a5d9317 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/12 21:25 upstream 0fed89a961ea 1a5d9317 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/12 04:22 upstream 0b46b049d6ec ee70e6db .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/11 20:32 upstream 0b46b049d6ec 16256247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/11 15:03 upstream 4d872d51bc9d 16256247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/11 01:41 upstream 4d872d51bc9d 16256247 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/10 11:17 upstream 80e54e84911a 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/10 05:15 upstream 80e54e84911a 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/10 02:18 upstream 1110ce6a1e34 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/09 21:49 upstream 1110ce6a1e34 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/09 12:58 upstream b7c90e3e717a 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/09 08:05 upstream b7c90e3e717a 163f510d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/01/31 04:30 upstream b4b0881156fb 4c6ac32f .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/01/27 20:44 upstream 805ba04cb7cc d99a33ad .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root BUG: unable to handle kernel paging request in folio_unlock
2025/03/15 10:04 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a5618886fdab e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/03/14 23:38 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 059f6cbcfa70 e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/03/14 08:50 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 059f6cbcfa70 e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/03/13 16:38 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 78e3fd2b7e4b 44be8b44 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
* Struck through repros no longer work on HEAD.