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Message-ID: <202511061629.e242724-lkp@intel.com>
Date: Thu, 6 Nov 2025 16:41:16 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Pasha Tatashin <pasha.tatashin@...een.com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, Pasha Tatashin
<pasha.tatashin@...een.com>, <kexec@...ts.infradead.org>,
<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
<akpm@...ux-foundation.org>, <brauner@...nel.org>, <corbet@....net>,
<graf@...zon.com>, <jgg@...pe.ca>, <linux-kselftest@...r.kernel.org>,
<masahiroy@...nel.org>, <ojeda@...nel.org>, <pratyush@...nel.org>,
<rdunlap@...radead.org>, <rppt@...nel.org>, <tj@...nel.org>,
<yanjun.zhu@...ux.dev>, <oliver.sang@...el.com>
Subject: Re: [PATCH v9 2/9] kho: drop notifiers
Hello,
kernel test robot noticed "WARNING:at_kernel/kexec_handover.c:#kho_add_subtree" on:
commit: e44a700c561d1e892a8d0829d557e221604a7b93 ("[PATCH v9 2/9] kho: drop notifiers")
url: https://github.com/intel-lab-lkp/linux/commits/Pasha-Tatashin/kho-make-debugfs-interface-optional/20251101-222610
patch link: https://lore.kernel.org/all/20251101142325.1326536-3-pasha.tatashin@soleen.com/
patch subject: [PATCH v9 2/9] kho: drop notifiers
in testcase: boot
config: x86_64-randconfig-001-20251015
compiler: gcc-14
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
(please refer to attached dmesg/kmsg for entire log/backtrace)
+--------------------------------------------------------+------------+------------+
| | 93e4b3b2e9 | e44a700c56 |
+--------------------------------------------------------+------------+------------+
| WARNING:at_kernel/kexec_handover.c:#kho_add_subtree | 0 | 8 |
| RIP:kho_add_subtree | 0 | 8 |
+--------------------------------------------------------+------------+------------+
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/202511061629.e242724-lkp@intel.com
[ 13.620111][ T1] ------------[ cut here ]------------
[ 13.620739][ T1] WARNING: CPU: 1 PID: 1 at kernel/kexec_handover.c:704 kho_add_subtree (kernel/kexec_handover.c:704)
[ 13.621665][ T1] Modules linked in:
[ 13.622090][ T1] CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.18.0-rc3-00211-ge44a700c561d #1 VOLUNTARY
[ 13.623073][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 13.624054][ T1] RIP: 0010:kho_add_subtree (kernel/kexec_handover.c:704)
[ 13.624596][ T1] Code: c7 38 b4 ac 85 31 ed e8 01 1c 00 00 48 c7 c7 70 5a ca 86 85 c0 89 c3 40 0f 95 c5 31 c9 31 d2 89 ee e8 37 b5 0a 00 85 db 74 02 <0f> 0b b9 01 00 00 00 31 d2 89 ee 48 c7 c7 40 5a ca 86 e8 1c b5 0a
All code
========
0: c7 38 b4 ac 85 xbegin 0xffffffff85acb43d,(bad)
5: 31 ed xor %ebp,%ebp
7: e8 01 1c 00 00 call 0x1c0d
c: 48 c7 c7 70 5a ca 86 mov $0xffffffff86ca5a70,%rdi
13: 85 c0 test %eax,%eax
15: 89 c3 mov %eax,%ebx
17: 40 0f 95 c5 setne %bpl
1b: 31 c9 xor %ecx,%ecx
1d: 31 d2 xor %edx,%edx
1f: 89 ee mov %ebp,%esi
21: e8 37 b5 0a 00 call 0xab55d
26: 85 db test %ebx,%ebx
28: 74 02 je 0x2c
2a:* 0f 0b ud2 <-- trapping instruction
2c: b9 01 00 00 00 mov $0x1,%ecx
31: 31 d2 xor %edx,%edx
33: 89 ee mov %ebp,%esi
35: 48 c7 c7 40 5a ca 86 mov $0xffffffff86ca5a40,%rdi
3c: e8 .byte 0xe8
3d: 1c b5 sbb $0xb5,%al
3f: 0a .byte 0xa
Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: b9 01 00 00 00 mov $0x1,%ecx
7: 31 d2 xor %edx,%edx
9: 89 ee mov %ebp,%esi
b: 48 c7 c7 40 5a ca 86 mov $0xffffffff86ca5a40,%rdi
12: e8 .byte 0xe8
13: 1c b5 sbb $0xb5,%al
15: 0a .byte 0xa
[ 13.626370][ T1] RSP: 0018:ffffc9000001fca0 EFLAGS: 00010286
[ 13.626951][ T1] RAX: dffffc0000000000 RBX: 00000000ffffffff RCX: 0000000000000000
[ 13.627737][ T1] RDX: 1ffffffff0d94b52 RSI: 0000000000000001 RDI: ffffffff86ca5a90
[ 13.628523][ T1] RBP: 0000000000000001 R08: 0000000000000008 R09: fffffbfff0dfac4c
[ 13.629330][ T1] R10: 0000000000000000 R11: ffffffff86fd6267 R12: ffff888133ee2000
[ 13.630101][ T1] R13: ffffffff85acb340 R14: ffff888117a5f988 R15: dffffc0000000000
[ 13.630869][ T1] FS: 0000000000000000(0000) GS:ffff888426ea0000(0000) knlGS:0000000000000000
[ 13.631727][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 13.632370][ T1] CR2: 00007f586df260ac CR3: 00000000054ea000 CR4: 00000000000406f0
[ 13.633154][ T1] Call Trace:
[ 13.633506][ T1] <TASK>
[ 13.633833][ T1] kho_test_prepare_fdt+0x145/0x180
[ 13.634446][ T1] ? kho_test_save_data+0x210/0x210
[ 13.635097][ T1] ? csum_partial (lib/checksum.c:123)
[ 13.635546][ T1] kho_test_init (lib/test_kho.c:177 lib/test_kho.c:284)
[ 13.636018][ T1] ? vmalloc_test_init (lib/test_kho.c:271)
[ 13.636508][ T1] ? add_device_randomness (drivers/char/random.c:944)
[ 13.637485][ T1] ? mix_pool_bytes (drivers/char/random.c:944)
[ 13.637955][ T1] ? trace_initcall_start (include/trace/events/initcall.h:27 (discriminator 3))
[ 13.638498][ T1] ? vmalloc_test_init (lib/test_kho.c:271)
[ 13.638989][ T1] do_one_initcall (init/main.c:1284)
[ 13.639477][ T1] ? trace_initcall_start (init/main.c:1274)
[ 13.639998][ T1] ? parse_one (kernel/params.c:143)
[ 13.640455][ T1] ? kasan_save_track (mm/kasan/common.c:69 (discriminator 1) mm/kasan/common.c:78 (discriminator 1))
[ 13.640948][ T1] ? __kmalloc_noprof (mm/slub.c:5659)
[ 13.641465][ T1] do_initcalls (init/main.c:1344 (discriminator 3) init/main.c:1361 (discriminator 3))
[ 13.641924][ T1] kernel_init_freeable (init/main.c:1595)
[ 13.642441][ T1] ? rest_init (init/main.c:1475)
[ 13.642891][ T1] kernel_init (init/main.c:1485)
[ 13.643345][ T1] ? rest_init (init/main.c:1475)
[ 13.643788][ T1] ret_from_fork (arch/x86/kernel/process.c:164)
[ 13.644256][ T1] ? rest_init (init/main.c:1475)
[ 13.644703][ T1] ret_from_fork_asm (arch/x86/entry/entry_64.S:255)
[ 13.645213][ T1] </TASK>
[ 13.645540][ T1] irq event stamp: 132025
[ 13.645971][ T1] hardirqs last enabled at (132035): __up_console_sem (arch/x86/include/asm/irqflags.h:26 arch/x86/include/asm/irqflags.h:109 arch/x86/include/asm/irqflags.h:151 kernel/printk/printk.c:345)
[ 13.646887][ T1] hardirqs last disabled at (132046): __up_console_sem (kernel/printk/printk.c:343 (discriminator 3))
[ 13.648253][ T1] softirqs last enabled at (131286): handle_softirqs (kernel/softirq.c:469 (discriminator 1) kernel/softirq.c:650 (discriminator 1))
[ 13.649690][ T1] softirqs last disabled at (131281): __irq_exit_rcu (kernel/softirq.c:496 kernel/softirq.c:723)
[ 13.651128][ T1] ---[ end trace 0000000000000000 ]---
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20251106/202511061629.e242724-lkp@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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