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Message-ID: <684efdcd.050a0220.be214.02c1.GAE@google.com> Date: Sun, 15 Jun 2025 10:07:25 -0700 From: syzbot <syzbot+c2ea94ae47cd7e3881ec@...kaller.appspotmail.com> To: jlbec@...lplan.org, joseph.qi@...ux.alibaba.com, linux-kernel@...r.kernel.org, mark@...heh.com, ocfs2-devel@...ts.linux.dev, syzkaller-bugs@...glegroups.com Subject: [syzbot] [ocfs2?] BUG: unable to handle kernel paging request in ocfs2_unlock_and_free_folios 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@...kaller.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 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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