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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: 109d, last: 4h04m
▶ ▼ 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 (273):
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
2025/05/16 06:22 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c919f08732cc cfde8269 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/04/05 07:54 upstream a52a3c18cdf3 c53ea9c9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs BUG: unable to handle kernel paging request in folio_unlock
2025/05/17 01:23 upstream 3c21441eeffc cfde8269 .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
2025/05/16 23:29 upstream 3c21441eeffc cfde8269 .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
2025/05/07 18:32 upstream 707df3375124 dbf35fa1 .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
2025/05/06 16:57 upstream 01f95500a162 350f4ffc .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
2025/05/05 04:52 upstream 92a09c47464d b0714e37 .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
2025/05/04 03:32 upstream 2a239ffbebb5 b0714e37 .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
2025/05/03 20:03 upstream 95d3481af6dc b0714e37 .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
2025/05/03 16:51 upstream 95d3481af6dc b0714e37 .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
2025/05/02 23:48 upstream 00b827f0cffa b0714e37 .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
2025/05/02 16:50 upstream ebd297a2affa d7f099d1 .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
2025/05/02 05:11 upstream ebd297a2affa 51b137cd .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
2025/05/02 00:04 upstream 4f79eaa2ceac 51b137cd .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
2025/04/30 15:31 upstream b6ea1680d0ac 937aafd7 .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
2025/04/30 04:28 upstream 8bac8898fe39 85a5a23f .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
2025/04/29 17:16 upstream ca91b9500108 9e704644 .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
2025/04/28 16:54 upstream b4432656b36e c6b4fb39 .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
2025/04/27 03:38 upstream 5bc1018675ec c6b4fb39 .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
2025/04/26 14:09 upstream f1a3944c860b c6b4fb39 .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
2025/04/25 07:19 upstream e72e9e693307 e3715315 .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
2025/04/24 12:43 upstream a79be02bba5c 9c80ffa0 .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
2025/04/23 23:19 upstream a79be02bba5c 9882047a .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
2025/04/23 13:01 upstream bc3372351d0c 57d54c08 .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
2025/04/22 05:30 upstream a33b5a08cbbd 2a20f901 .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
2025/04/20 18:55 upstream 6fea5fabd332 2a20f901 .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
2025/04/20 10:12 upstream 119009db2674 2a20f901 .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
2025/04/19 10:01 upstream 3088d26962e8 2a20f901 .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
2025/04/18 06:55 upstream b5c6891b2c5b 2a20f901 .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
2025/04/16 21:13 upstream c62f4b82d571 a95239b1 .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
2025/04/16 09:13 upstream 1a1d569a75f3 a95239b1 .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
2025/04/16 02:47 upstream 1a1d569a75f3 a95239b1 .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
2025/05/16 15:24 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c919f08732cc cfde8269 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/05/16 11:52 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c919f08732cc cfde8269 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/05/16 05:51 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c919f08732cc cfde8269 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/05/11 05:30 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c32f8dc5aaf9 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/04/26 13:04 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c72692105976 c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/04/26 01:04 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c72692105976 c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/04/18 23:11 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c72692105976 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/04/18 08:02 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c72692105976 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/04/17 17:37 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c72692105976 2a6ededb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/04/17 04:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c72692105976 23b969b7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/04/16 13:00 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c72692105976 23b969b7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/04/16 10:13 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c72692105976 23b969b7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/04/15 23:20 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c72692105976 23b969b7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/04/15 06:55 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c72692105976 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in folio_unlock
2025/04/14 14:55 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 2fe2b96c3818 0bd6db41 .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.