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Message-ID: <202509211121.ebd9f4b0-lkp@intel.com>
Date: Sun, 21 Sep 2025 17:43:46 +0800
From: kernel test robot <oliver.sang@...el.com>
To: NeilBrown <neilb@...mail.net>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, Amir Goldstein
<amir73il@...il.com>, <linux-doc@...r.kernel.org>,
<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
<linux-bcachefs@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
<ocfs2-devel@...ts.linux.dev>, <linux-cifs@...r.kernel.org>,
<bpf@...r.kernel.org>, <netdev@...r.kernel.org>, Alexander Viro
<viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, "Jeff
Layton" <jlayton@...nel.org>, Jan Kara <jack@...e.cz>,
<oliver.sang@...el.com>
Subject: Re: [PATCH v3 5/6] VFS: rename kern_path_locked() and related
functions.
Hello,
kernel test robot noticed "BUG:unable_to_handle_page_fault_for_address" on:
commit: 747e356babd8bdd569320c29916470345afd3cf7 ("[PATCH v3 5/6] VFS: rename kern_path_locked() and related functions.")
url: https://github.com/intel-lab-lkp/linux/commits/NeilBrown/VFS-ovl-add-lookup_one_positive_killable/20250915-101929
base: https://git.kernel.org/cgit/linux/kernel/git/vfs/vfs.git vfs.all
patch link: https://lore.kernel.org/all/20250915021504.2632889-6-neilb@ownmail.net/
patch subject: [PATCH v3 5/6] VFS: rename kern_path_locked() and related functions.
in testcase: boot
config: i386-randconfig-2006-20250825
compiler: gcc-14
test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G
(please refer to attached dmesg/kmsg for entire log/backtrace)
+---------------------------------------------+------------+------------+
| | 1c87fa0646 | 747e356bab |
+---------------------------------------------+------------+------------+
| boot_successes | 24 | 0 |
| boot_failures | 0 | 24 |
| BUG:unable_to_handle_page_fault_for_address | 0 | 24 |
| Oops:Oops:#[##] | 0 | 24 |
| EIP:mnt_want_write | 0 | 24 |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 24 |
+---------------------------------------------+------------+------------+
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@...el.com>
| Closes: https://lore.kernel.org/oe-lkp/202509211121.ebd9f4b0-lkp@intel.com
[ 12.277015][ T18] BUG: unable to handle page fault for address: fefeff02
[ 12.278063][ T18] #PF: supervisor read access in kernel mode
[ 12.278982][ T18] #PF: error_code(0x0000) - not-present page
[ 12.279886][ T18] *pde = 00000000
[ 12.280491][ T18] Oops: Oops: 0000 [#1]
[ 12.281158][ T18] CPU: 0 UID: 0 PID: 18 Comm: kdevtmpfs Not tainted 6.17.0-rc3-00100-g747e356babd8 #1 PREEMPT(full) 97a7d9f1f9975edf00ea02f43ed800cec17522a0
[ 12.283292][ T18] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 12.283887][ T18] EIP: mnt_want_write (include/linux/fs.h:1908 include/linux/fs.h:2044 fs/namespace.c:566)
[ 12.283887][ T18] Code: 74 26 00 55 83 e8 30 89 e5 e8 b0 ff ff ff 5d c3 2e 8d b4 26 00 00 00 00 8d b6 00 00 00 00 3e 8d 74 26 00 55 89 e5 56 53 89 c3 <8b> 40 04 05 d8 01 00 00 e8 67 f5 ff ff 89 d8 e8 90 e6 ff ff 89 c6
All code
========
0: 74 26 je 0x28
2: 00 55 83 add %dl,-0x7d(%rbp)
5: e8 30 89 e5 e8 call 0xffffffffe8e5893a
a: b0 ff mov $0xff,%al
c: ff (bad)
d: ff 5d c3 lcall *-0x3d(%rbp)
10: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi
17: 00
18: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi
1e: 3e 8d 74 26 00 ds lea 0x0(%rsi,%riz,1),%esi
23: 55 push %rbp
24: 89 e5 mov %esp,%ebp
26: 56 push %rsi
27: 53 push %rbx
28: 89 c3 mov %eax,%ebx
2a:* 8b 40 04 mov 0x4(%rax),%eax <-- trapping instruction
2d: 05 d8 01 00 00 add $0x1d8,%eax
32: e8 67 f5 ff ff call 0xfffffffffffff59e
37: 89 d8 mov %ebx,%eax
39: e8 90 e6 ff ff call 0xffffffffffffe6ce
3e: 89 c6 mov %eax,%esi
Code starting with the faulting instruction
===========================================
0: 8b 40 04 mov 0x4(%rax),%eax
3: 05 d8 01 00 00 add $0x1d8,%eax
8: e8 67 f5 ff ff call 0xfffffffffffff574
d: 89 d8 mov %ebx,%eax
f: e8 90 e6 ff ff call 0xffffffffffffe6a4
14: 89 c6 mov %eax,%esi
[ 12.283887][ T18] EAX: fefefefe EBX: fefefefe ECX: c5923640 EDX: c58b9e28
[ 12.283887][ T18] ESI: c58b9f0c EDI: c54024e0 EBP: c58b9ea4 ESP: c58b9e9c
[ 12.283887][ T18] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010246
[ 12.283887][ T18] CR0: 80050033 CR2: fefeff02 CR3: 04780000 CR4: 000406d0
[ 12.283887][ T18] Call Trace:
[ 12.283887][ T18] __start_removing_path (include/linux/fs.h:1024 fs/namei.c:2784)
[ 12.283887][ T18] start_removing_path (fs/namei.c:2842)
[ 12.283887][ T18] devtmpfs_work_loop (drivers/base/devtmpfs.c:326 drivers/base/devtmpfs.c:387 drivers/base/devtmpfs.c:400)
[ 12.283887][ T18] devtmpfsd (drivers/base/devtmpfs.c:444)
[ 12.283887][ T18] kthread (kernel/kthread.c:465)
[ 12.283887][ T18] ? vclkdev_alloc (drivers/base/devtmpfs.c:436)
[ 12.283887][ T18] ? kthread_is_per_cpu (kernel/kthread.c:412)
[ 12.283887][ T18] ret_from_fork (arch/x86/kernel/process.c:154)
[ 12.283887][ T18] ? kthread_is_per_cpu (kernel/kthread.c:412)
[ 12.283887][ T18] ret_from_fork_asm (arch/x86/entry/entry_32.S:737)
[ 12.283887][ T18] entry_INT80_32 (arch/x86/entry/entry_32.S:945)
[ 12.283887][ T18] Modules linked in:
[ 12.283887][ T18] CR2: 00000000fefeff02
[ 12.283887][ T18] ---[ end trace 0000000000000000 ]---
[ 12.283887][ T18] EIP: mnt_want_write (include/linux/fs.h:1908 include/linux/fs.h:2044 fs/namespace.c:566)
[ 12.283887][ T18] Code: 74 26 00 55 83 e8 30 89 e5 e8 b0 ff ff ff 5d c3 2e 8d b4 26 00 00 00 00 8d b6 00 00 00 00 3e 8d 74 26 00 55 89 e5 56 53 89 c3 <8b> 40 04 05 d8 01 00 00 e8 67 f5 ff ff 89 d8 e8 90 e6 ff ff 89 c6
All code
========
0: 74 26 je 0x28
2: 00 55 83 add %dl,-0x7d(%rbp)
5: e8 30 89 e5 e8 call 0xffffffffe8e5893a
a: b0 ff mov $0xff,%al
c: ff (bad)
d: ff 5d c3 lcall *-0x3d(%rbp)
10: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi
17: 00
18: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi
1e: 3e 8d 74 26 00 ds lea 0x0(%rsi,%riz,1),%esi
23: 55 push %rbp
24: 89 e5 mov %esp,%ebp
26: 56 push %rsi
27: 53 push %rbx
28: 89 c3 mov %eax,%ebx
2a:* 8b 40 04 mov 0x4(%rax),%eax <-- trapping instruction
2d: 05 d8 01 00 00 add $0x1d8,%eax
32: e8 67 f5 ff ff call 0xfffffffffffff59e
37: 89 d8 mov %ebx,%eax
39: e8 90 e6 ff ff call 0xffffffffffffe6ce
3e: 89 c6 mov %eax,%esi
Code starting with the faulting instruction
===========================================
0: 8b 40 04 mov 0x4(%rax),%eax
3: 05 d8 01 00 00 add $0x1d8,%eax
8: e8 67 f5 ff ff call 0xfffffffffffff574
d: 89 d8 mov %ebx,%eax
f: e8 90 e6 ff ff call 0xffffffffffffe6a4
14: 89 c6 mov %eax,%esi
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250921/202509211121.ebd9f4b0-lkp@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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