syzbot


kernel BUG in may_open (2)

Status: upstream: reported C repro on 2025/07/08 17:51
Subsystems: nilfs
[Documentation on labels]
Reported-by: syzbot+895c23f6917da440ed0d@syzkaller.appspotmail.com
Fix commit: nilfs2: reject invalid file types when reading inodes
Patched on: [ci-upstream-linux-next-kasan-gce-root ci-upstream-rust-kasan-gce], missing on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 5d05h, last: 5m
Cause bisection: introduced by (bisect log) :
commit af153bb63a336a7ca0d9c8ef4ca98119c5020030
Author: Mateusz Guzik <mjguzik@gmail.com>
Date: Sun Feb 9 18:55:21 2025 +0000

  vfs: catch invalid modes in may_open()

Crash: kernel BUG in may_open (log)
Repro: C syz .config
  
Discussions (3)
Title Replies (including bot) Last reply
[PATCH] isofs: Verify inode mode when loading from disk 4 (4) 2025/07/11 09:39
[PATCH] nilfs2: reject invalid file types when reading inodes 1 (1) 2025/07/10 13:49
[syzbot] [nilfs?] kernel BUG in may_open (2) 3 (4) 2025/07/10 07:42
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in may_open fs -1 C error 137019 5d05h 101d 29/29 fixed on 2025/07/08 00:33

Sample crash report:
         and is ignored by this kernel. Remove the mand
         option from the mount to silence this warning.
=======================================================
VFS_BUG_ON_INODE(!IS_ANON_FILE(inode)) encountered for inode ffff888075554568
------------[ cut here ]------------
kernel BUG at fs/namei.c:3483!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 5842 Comm: syz-executor324 Not tainted 6.16.0-rc5-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:may_open+0x4b1/0x4c0 fs/namei.c:3483
Code: 38 c1 0f 8c 1e fd ff ff 4c 89 e7 e8 69 25 ec ff e9 11 fd ff ff e8 9f cd 8a ff 4c 89 f7 48 c7 c6 40 40 99 8b e8 70 cb f2 fe 90 <0f> 0b 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffc90004127940 EFLAGS: 00010246
RAX: 000000000000004d RBX: dffffc0000000000 RCX: 3f616dc4bb55cb00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 000000000010f842 R08: ffff8880b8624293 R09: 1ffff110170c4852
R10: dffffc0000000000 R11: ffffed10170c4853 R12: 0000000000000000
R13: ffffffff8e29ca80 R14: ffff888075554568 R15: 0000000000000006
FS:  000055558fe4d380(0000) GS:ffff888125d51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000066c7e0 CR3: 0000000074c40000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 do_open fs/namei.c:3894 [inline]
 path_openat+0x2d91/0x3830 fs/namei.c:4055
 do_filp_open+0x1fa/0x410 fs/namei.c:4082
 do_sys_openat2+0x121/0x1c0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1463
 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: 0033:0x7ff3e0b20679
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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:00007ffc3b0b1508 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0031656c69662f2e RCX: 00007ff3e0b20679
RDX: 0000000000107842 RSI: 0000200000000040 RDI: 00000000ffffff9c
RBP: 00007ff3e0b93610 R08: 00000000000005b3 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc3b0b16d8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:may_open+0x4b1/0x4c0 fs/namei.c:3483
Code: 38 c1 0f 8c 1e fd ff ff 4c 89 e7 e8 69 25 ec ff e9 11 fd ff ff e8 9f cd 8a ff 4c 89 f7 48 c7 c6 40 40 99 8b e8 70 cb f2 fe 90 <0f> 0b 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffc90004127940 EFLAGS: 00010246
RAX: 000000000000004d RBX: dffffc0000000000 RCX: 3f616dc4bb55cb00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 000000000010f842 R08: ffff8880b8624293 R09: 1ffff110170c4852
R10: dffffc0000000000 R11: ffffed10170c4853 R12: 0000000000000000
R13: ffffffff8e29ca80 R14: ffff888075554568 R15: 0000000000000006
FS:  000055558fe4d380(0000) GS:ffff888125d51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005617510f6168 CR3: 0000000074c40000 CR4: 00000000003526f0

Crashes (1619):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/08 13:03 upstream d7b8f8e20813 4f67c4ae .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs kernel BUG in may_open
2025/07/08 12:34 upstream d7b8f8e20813 4f67c4ae .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs kernel BUG in may_open
2025/07/08 12:04 upstream d7b8f8e20813 4f67c4ae .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs kernel BUG in may_open
2025/07/08 04:06 upstream d7b8f8e20813 4f67c4ae .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs kernel BUG in may_open
2025/07/08 02:39 upstream d7b8f8e20813 4f67c4ae .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs kernel BUG in may_open
2025/07/08 01:41 upstream d7b8f8e20813 4f67c4ae .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs kernel BUG in may_open
2025/07/08 01:56 upstream d7b8f8e20813 4f67c4ae .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root kernel BUG in may_open
2025/07/08 01:21 upstream d7b8f8e20813 4f67c4ae .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root kernel BUG in may_open
2025/07/12 16:37 linux-next a62b7a37e6fc 3cda49cf .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root kernel BUG in may_open
2025/07/08 01:57 linux-next 26ffb3d6f02c 4f67c4ae .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root kernel BUG in may_open
2025/07/08 02:15 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 7482bb149b9f 4f67c4ae .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-gce-arm64 kernel BUG in may_open
2025/07/08 01:34 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 7482bb149b9f 4f67c4ae .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 kernel BUG in may_open
2025/07/13 05:57 upstream 3f31a806a62e 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/13 04:49 upstream 3f31a806a62e 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/13 03:49 upstream 3f31a806a62e 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/13 03:39 upstream 3f31a806a62e 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/13 02:38 upstream 3f31a806a62e 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/13 01:48 upstream 3f31a806a62e 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/13 00:04 upstream 3f31a806a62e 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 23:03 upstream 3f31a806a62e 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 22:59 upstream 3f31a806a62e 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 20:26 upstream 379f604cc3dc 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 20:06 upstream 379f604cc3dc 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 17:42 upstream 379f604cc3dc 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 16:42 upstream 379f604cc3dc 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 16:25 upstream 379f604cc3dc 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 14:03 upstream 379f604cc3dc 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 13:07 upstream 379f604cc3dc 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 13:01 upstream 379f604cc3dc 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 12:02 upstream 379f604cc3dc 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 11:12 upstream 379f604cc3dc 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 11:11 upstream 379f604cc3dc 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 09:43 upstream 379f604cc3dc 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 08:37 upstream 379f604cc3dc 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 07:17 upstream 40f92e79b0aa 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 06:18 upstream 40f92e79b0aa 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 05:16 upstream 40f92e79b0aa 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 04:12 upstream 40f92e79b0aa 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 02:56 upstream 40f92e79b0aa 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 01:41 upstream 40f92e79b0aa 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 01:27 upstream 40f92e79b0aa 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/12 00:25 upstream 40f92e79b0aa 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/11 23:46 upstream 40f92e79b0aa 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in may_open
2025/07/11 18:05 upstream bc9ff192a6c9 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root kernel BUG in may_open
2025/07/11 10:48 upstream bc9ff192a6c9 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel BUG in may_open
2025/07/13 04:55 upstream 3f31a806a62e 3cda49cf .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in may_open
2025/07/12 18:43 upstream 379f604cc3dc 3cda49cf .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in may_open
2025/07/12 15:06 upstream 379f604cc3dc 3cda49cf .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in may_open
2025/07/12 05:29 upstream 40f92e79b0aa 3cda49cf .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in may_open
2025/07/12 04:03 upstream 40f92e79b0aa 3cda49cf .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in may_open
2025/07/11 22:44 upstream 40f92e79b0aa 3cda49cf .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in may_open
2025/07/12 15:05 linux-next a62b7a37e6fc 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in may_open
2025/07/12 10:06 linux-next a62b7a37e6fc 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in may_open
2025/07/13 01:41 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ec4801305969 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in may_open
2025/07/13 00:40 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ec4801305969 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in may_open
2025/07/12 21:50 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ec4801305969 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in may_open
2025/07/12 19:03 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ec4801305969 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in may_open
2025/07/12 02:41 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ec4801305969 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in may_open
2025/07/11 21:37 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci ec4801305969 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in may_open
* Struck through repros no longer work on HEAD.