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Sun, 21 Sep 2025 09:43:58 +0000 Date: Sun, 21 Sep 2025 17:43:46 +0800 From: kernel test robot To: NeilBrown CC: , , Amir Goldstein , , , , , , , , , , Alexander Viro , Christian Brauner , "Jeff Layton" , Jan Kara , Subject: Re: [PATCH v3 5/6] VFS: rename kern_path_locked() and related functions. 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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 | 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