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SGrtdhYRClgJ8Imfm/erpX5uIPixm4/zI4pPAl3L5OBg/TY9X6pMWXrKQ7LjlCV+qLdDHNu6a5QVbf5ZzokyItdHGk9NHoF6oR7SuM1BM47wPG9k1lKdGs4tEDcZEMV8LSWvxNoAGOxFWB64Xhml8CTSX4bfIZ30GDacx5S7GylZ6jVfpGotIWpi9meo8cdYkcJqeOPKL7uoVCP2H4+69i8yz0fw84fwYgdm8ZfcJyX9Bkv79JA4lCpQZPhnvPl3yABuaF5KlFkHcFIOToZnfsr53dybJyIhkvAx7Zedn1+Wow2O/0fG49CMhrAEVkDnAmkFm5blsYqft+HaNDeX7QqO+TRKwQ9gTyGtAyTMQly2xhT/YrEgfVWRQQdIw/R5xyhs8DQ9onvkSej8EbtblxYfkjIb2nXz7KDt1bMzWPUAYdxGxxqfJXnMCYQFEYycmNboVFzTxhOerWBT55dey/4L3VJ1Czpn7mnFw2b/ahC5zXb3rNIPAaiMMABh7IlwEW242GSMgM1M39D0cGmIBzF4RRgBuzf78RgOcxVZ3XdtMsIIa5e1IcVXtVRq9vBlomKIXHqc/oP0sZBGXhQ7Ly588bhOv2mv/XUhazanxTJ9yIEYp8kyi/VxeXV3xxWPQLNT28G8p4t6bg71SMZ1axZ7dHC80MJN5HNLR X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, as we understand, this commit is not the root cause of the WARNING. but just changes the stats as below table [1] we just report FYI there is a WARNING caused by related code in our tests, in case anybody think it's worth to look further. thanks kernel test robot noticed "WARNING:at_kernel/liveupdate/kexec_handover.c:#kho_add_subtree" on: commit: 91cb1aaea4b8276323b3814d35f6e62133f64c1b ("[PATCH v9 7/9] liveupdate: kho: move to kernel/liveupdate") 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/20251101142325.1326536-8-pasha.tatashin@soleen.com/ patch subject: [PATCH v9 7/9] liveupdate: kho: move to kernel/liveupdate 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) [1] +--------------------------------------------------------------------------------------+------------+------------+ | | dc74e80622 | 91cb1aaea4 | +--------------------------------------------------------------------------------------+------------+------------+ | WARNING:at_kernel/kexec_handover.c:#kho_add_subtree | 8 | | | WARNING:at_kernel/liveupdate/kexec_handover.c:#kho_add_subtree | 0 | 11 | +--------------------------------------------------------------------------------------+------------+------------+ 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/202511061443.64dd159-lkp@intel.com [ 12.679864][ T1] ------------[ cut here ]------------ [ 12.680514][ T1] WARNING: CPU: 0 PID: 1 at kernel/liveupdate/kexec_handover.c:711 kho_add_subtree (kernel/liveupdate/kexec_handover.c:711) [ 12.681526][ T1] Modules linked in: [ 12.681957][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.18.0-rc3-00216-g91cb1aaea4b8 #1 VOLUNTARY [ 12.682956][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.683951][ T1] RIP: 0010:kho_add_subtree (kernel/liveupdate/kexec_handover.c:711) [ 12.684514][ T1] Code: c7 58 2e a7 85 31 ed e8 31 1a 00 00 48 c7 c7 c0 12 c9 86 85 c0 89 c3 40 0f 95 c5 31 c9 31 d2 89 ee e8 57 a0 13 00 85 db 74 02 <0f> 0b b9 01 00 00 00 31 d2 89 ee 48 c7 c7 90 12 c9 86 e8 3c a0 13 All code ======== 0: c7 (bad) 1: 58 pop %rax 2: 2e a7 cmpsl %es:(%rdi),%ds:(%rsi) 4: 85 31 test %esi,(%rcx) 6: ed in (%dx),%eax 7: e8 31 1a 00 00 call 0x1a3d c: 48 c7 c7 c0 12 c9 86 mov $0xffffffff86c912c0,%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 57 a0 13 00 call 0x13a07d 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 90 12 c9 86 mov $0xffffffff86c91290,%rdi 3c: e8 .byte 0xe8 3d: 3c a0 cmp $0xa0,%al 3f: 13 .byte 0x13 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 90 12 c9 86 mov $0xffffffff86c91290,%rdi 12: e8 .byte 0xe8 13: 3c a0 cmp $0xa0,%al 15: 13 .byte 0x13 [ 12.686315][ T1] RSP: 0018:ffffc9000001fc58 EFLAGS: 00010286 [ 12.687184][ T1] RAX: dffffc0000000000 RBX: 00000000ffffffff RCX: 0000000000000000 [ 12.688370][ T1] RDX: 1ffffffff0d9225c RSI: 0000000000000001 RDI: ffffffff86c912e0 [ 12.689572][ T1] RBP: 0000000000000001 R08: 0000000000000008 R09: fffffbfff0dfac6c [ 12.690762][ T1] R10: 0000000000000000 R11: ffffffff86fd6367 R12: ffff888133ce6000 [ 12.691996][ T1] R13: ffffffff85a72d60 R14: ffff88810ce59888 R15: dffffc0000000000 [ 12.693231][ T1] FS: 0000000000000000(0000) GS:ffff888426da0000(0000) knlGS:0000000000000000 [ 12.694585][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 12.695569][ T1] CR2: 00007f6d5dc8f0ac CR3: 00000000054ea000 CR4: 00000000000406f0 [ 12.696832][ T1] Call Trace: [ 12.697400][ T1] [ 12.697922][ T1] kho_test_preserve+0x2fa/0x360 [ 12.698835][ T1] ? folio_order (arch/x86/kvm/../../../virt/kvm/guest_memfd.c:181 (discriminator 3)) [ 12.699556][ T1] ? kho_test_generate_data+0x107/0x180 [ 12.700561][ T1] kho_test_init (lib/test_kho.c:222 lib/test_kho.c:327) [ 12.701312][ T1] ? vmalloc_test_init (lib/test_kho.c:314) [ 12.702100][ T1] ? add_device_randomness (drivers/char/random.c:944) [ 12.702924][ T1] ? mix_pool_bytes (drivers/char/random.c:944) [ 12.703646][ T1] ? trace_initcall_start (include/trace/events/initcall.h:27 (discriminator 3)) [ 12.704499][ T1] ? vmalloc_test_init (lib/test_kho.c:314) [ 12.705291][ T1] do_one_initcall (init/main.c:1284) [ 12.706047][ T1] ? trace_initcall_start (init/main.c:1274) [ 12.706897][ T1] ? parse_one (kernel/params.c:143) [ 12.707623][ T1] ? kasan_save_track (mm/kasan/common.c:69 (discriminator 1) mm/kasan/common.c:78 (discriminator 1)) [ 12.708394][ T1] ? __kmalloc_noprof (mm/slub.c:5659) [ 12.709218][ T1] do_initcalls (init/main.c:1344 (discriminator 3) init/main.c:1361 (discriminator 3)) [ 12.709976][ T1] kernel_init_freeable (init/main.c:1595) [ 12.710752][ T1] ? rest_init (init/main.c:1475) [ 12.711473][ T1] kernel_init (init/main.c:1485) [ 12.712165][ T1] ? rest_init (init/main.c:1475) [ 12.712871][ T1] ret_from_fork (arch/x86/kernel/process.c:164) [ 12.713609][ T1] ? rest_init (init/main.c:1475) [ 12.714326][ T1] ret_from_fork_asm (arch/x86/entry/entry_64.S:255) [ 12.715029][ T1] [ 12.715548][ T1] irq event stamp: 131753 [ 12.716243][ T1] hardirqs last enabled at (131763): __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) [ 12.717702][ T1] hardirqs last disabled at (131776): __up_console_sem (kernel/printk/printk.c:343 (discriminator 3)) [ 12.719185][ T1] softirqs last enabled at (131460): handle_softirqs (kernel/softirq.c:469 (discriminator 1) kernel/softirq.c:650 (discriminator 1)) [ 12.720632][ T1] softirqs last disabled at (131455): __irq_exit_rcu (kernel/softirq.c:496 kernel/softirq.c:723) [ 12.721755][ T1] ---[ end trace 0000000000000000 ]--- The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20251106/202511061443.64dd159-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki