syzbot


kernel BUG in ntfs_read_folio

Status: upstream: reported C repro on 2026/04/13 03:31
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+3687978360fc6d49c5d2@syzkaller.appspotmail.com
First crash: 13d, last: 13d
Bug presence (2)
Date Name Commit Repro Result
2026/04/13 linux-6.6.y (ToT) 8cee53b8eaeb C [report] kernel BUG in ntfs_read_folio
2026/04/13 upstream (ToT) 028ef9c96e96 C Didn't crash
Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 kernel BUG in ntfs_read_folio missing-backport origin:lts-only -1 C done 317 27d 1142d 0/3 upstream: reported C repro on 2023/03/10 09:54
upstream kernel BUG at fs/ntfs/aops.c:LINE! ntfs3 -1 C done done 3893 747d 2928d 0/29 auto-obsoleted due to no activity on 2024/07/09 06:04
Fix bisection attempts (1)
Created Duration User Patch Repo Result
2026/04/13 12:50 1m fix candidate upstream error job log

Sample crash report:
syz.0.17[5920]: memfd_create() called without MFD_EXEC or MFD_NOEXEC_SEAL set
loop0: detected capacity change from 0 to 4096
------------[ cut here ]------------
kernel BUG at fs/ntfs/aops.c:186!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 5920 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:ntfs_read_block fs/ntfs/aops.c:186 [inline]
RIP: 0010:ntfs_read_folio+0x26f8/0x2990 fs/ntfs/aops.c:436
Code: bc 24 80 00 00 00 00 0f 84 cf 00 00 00 e8 e0 79 c6 fe e9 43 02 00 00 e8 d6 79 c6 fe 0f 0b e8 cf 79 c6 fe 0f 0b e8 c8 79 c6 fe <0f> 0b 48 8b 7c 24 18 be 08 00 00 00 e8 17 b3 1e ff 48 b8 00 00 00
RSP: 0018:ffffc900033175c0 EFLAGS: 00010293
RAX: ffffffff82c0a838 RBX: 0000000000000000 RCX: ffff88802bfa0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900033177b0 R08: ffff88805ed68057 R09: 1ffff1100bdad00a
R10: dffffc0000000000 R11: ffffed100bdad00b R12: dffffc0000000000
R13: 1ffffd40002f0c70 R14: ffff888076cd1000 R15: ffffea0001786380
FS:  000055556b1c8500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcc0804b53c CR3: 000000007352d000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 filemap_read_folio+0x172/0x760 mm/filemap.c:2420
 do_read_cache_folio+0x468/0x7d0 mm/filemap.c:3804
 do_read_cache_page+0x32/0x250 mm/filemap.c:3870
 read_mapping_page include/linux/pagemap.h:892 [inline]
 ntfs_map_page fs/ntfs/aops.h:75 [inline]
 map_mft_record_page fs/ntfs/mft.c:73 [inline]
 map_mft_record+0x1e3/0x650 fs/ntfs/mft.c:156
 ntfs_read_locked_inode+0x1ae/0x4e40 fs/ntfs/inode.c:550
 ntfs_read_inode_mount+0xf6f/0x28f0 fs/ntfs/inode.c:2098
 ntfs_fill_super+0x16dd/0x2a50 fs/ntfs/super.c:2863
 mount_bdev+0x221/0x2d0 fs/super.c:1643
 legacy_get_tree+0xea/0x180 fs/fs_context.c:662
 vfs_get_tree+0x8c/0x280 fs/super.c:1764
 do_new_mount+0x24b/0xa40 fs/namespace.c:3386
 do_mount fs/namespace.c:3726 [inline]
 __do_sys_mount fs/namespace.c:3935 [inline]
 __se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fcc07f9da8a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe9bf54078 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe9bf54100 RCX: 00007fcc07f9da8a
RDX: 000020000001ec80 RSI: 000020000001ecc0 RDI: 00007ffe9bf540c0
RBP: 000020000001ec80 R08: 00007ffe9bf54100 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000020000001ecc0
R13: 00007ffe9bf540c0 R14: 000000000001ec5f R15: 000020000001ed00
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ntfs_read_block fs/ntfs/aops.c:186 [inline]
RIP: 0010:ntfs_read_folio+0x26f8/0x2990 fs/ntfs/aops.c:436
Code: bc 24 80 00 00 00 00 0f 84 cf 00 00 00 e8 e0 79 c6 fe e9 43 02 00 00 e8 d6 79 c6 fe 0f 0b e8 cf 79 c6 fe 0f 0b e8 c8 79 c6 fe <0f> 0b 48 8b 7c 24 18 be 08 00 00 00 e8 17 b3 1e ff 48 b8 00 00 00
RSP: 0018:ffffc900033175c0 EFLAGS: 00010293
RAX: ffffffff82c0a838 RBX: 0000000000000000 RCX: ffff88802bfa0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900033177b0 R08: ffff88805ed68057 R09: 1ffff1100bdad00a
R10: dffffc0000000000 R11: ffffed100bdad00b R12: dffffc0000000000
R13: 1ffffd40002f0c70 R14: ffff888076cd1000 R15: ffffea0001786380
FS:  000055556b1c8500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcc0804b53c CR3: 000000007352d000 CR4: 00000000003506e0

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/04/13 04:33 linux-6.6.y 8cee53b8eaeb 38c8e246 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-6-kasan kernel BUG in ntfs_read_folio
2026/04/13 04:00 linux-6.6.y 8cee53b8eaeb 38c8e246 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-6-kasan kernel BUG in ntfs_read_folio
2026/04/13 03:30 linux-6.6.y 8cee53b8eaeb 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan kernel BUG in ntfs_read_folio
* Struck through repros no longer work on HEAD.