Bug report in HID: input: Add support for multiple batteries per device
From: Rafael Passos
Date: Mon Jun 01 2026 - 21:20:10 EST
Hi, I found a bug preventing preventing my laptop from booting
the mainline, and my bisection led me to this patch.
I believe I found the issue already, and will send a patch
following this report.
Decoded trace:
```
jun 01 20:03:15 debbook kernel: Oops: Oops: 0000 [#1] SMP NOPTI
jun 01 20:03:15 debbook kernel: CPU: 4 UID: 0 PID: 257 Comm: (udev-worker) Not tainted 7.1.0-rc6rcpassos #85 PREEMPT(lazy)
jun 01 20:03:15 debbook kernel: Hardware name: HP HP ProBook x360 435 G7/8735, BIOS S80 Ver. 01.17.02 06/07/2024
jun 01 20:03:15 debbook kernel: RIP: 0010:hidinput_setup_battery.isra.0 (/media/wd/code/kernel-dev/linux/drivers/hid/hid-input.c:412 /media/wd/code/kernel-dev/linux/drivers/hid/hid-input.c:523) hid
jun 01 20:03:15 debbook kernel: Code: f3 48 ab 48 8b 85 18 1c 00 00 48 39 c3 74 4b 48 8b 52 68 48 83 e8 38 8b 4a 30 eb 0e 90 48 8b 50 38 48 8d 42 c8 48 39 d3 74 30 <3b> >
All code
========
0: f3 48 ab rep stos %rax,(%rdi)
3: 48 8b 85 18 1c 00 00 mov 0x1c18(%rbp),%rax
a: 48 39 c3 cmp %rax,%rbx
d: 74 4b je 0x5a
f: 48 8b 52 68 mov 0x68(%rdx),%rdx
13: 48 83 e8 38 sub $0x38,%rax
17: 8b 4a 30 mov 0x30(%rdx),%ecx
1a: eb 0e jmp 0x2a
1c: 90 nop
1d: 48 8b 50 38 mov 0x38(%rax),%rdx
21: 48 8d 42 c8 lea -0x38(%rdx),%rax
25: 48 39 d3 cmp %rdx,%rbx
28: 74 30 je 0x5a
2a:* 3b 00 cmp (%rax),%eax <-- trapping instruction
Code starting with the faulting instruction
===========================================
0: 3b 00 cmp (%rax),%eax
jun 01 20:03:15 debbook kernel: RSP: 0018:ffffce87407c76c0 EFLAGS: 00010286
jun 01 20:03:15 debbook kernel: RAX: ffffffffffffffc8 RBX: ffff8db823bb7c18 RCX: 0000000000000007
jun 01 20:03:15 debbook kernel: RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffce87407c7718
jun 01 20:03:15 debbook kernel: RBP: ffff8db823bb6000 R08: ffffce87407c77c0 R09: ffffce87407c77bc
jun 01 20:03:15 debbook kernel: R10: ffff8db80df756c0 R11: ffff8db81f7b3000 R12: ffffce87407c76e8
jun 01 20:03:15 debbook kernel: R13: ffff8db80df756c0 R14: ffff8db823bb6000 R15: ffff8db823119600
jun 01 20:03:15 debbook kernel: FS: 00007fe5afebfd80(0000) GS:ffff8dbf6807b000(0000) knlGS:0000000000000000
jun 01 20:03:15 debbook kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
jun 01 20:03:15 debbook kernel: CR2: ffffffffffffffe4 CR3: 000000011ffe4000 CR4: 0000000000350ef0
jun 01 20:03:15 debbook kernel: Call Trace:
jun 01 20:03:15 debbook kernel: <TASK>
jun 01 20:03:15 debbook kernel: ? input_alloc_absinfo (./include/linux/slab.h:950 ./include/linux/slab.h:1188 drivers/input/input.c:442)
jun 01 20:03:15 debbook kernel: hidinput_connect (/media/wd/code/kernel-dev/linux/drivers/hid/hid-input.c:1294 /media/wd/code/kernel-dev/linux/drivers/hid/hid-input.c:2278 /media/wd/code/kernel-dev/linux/drivers/hid/hid-input.c:2345) hid
jun 01 20:03:15 debbook kernel: hid_connect (/media/wd/code/kernel-dev/linux/drivers/hid/hid-core.c:2308 (discriminator 1)) hid
jun 01 20:03:15 debbook kernel: ? vfree.part.0 (mm/vmalloc.c:3475)
jun 01 20:03:15 debbook kernel: hid_hw_start (/media/wd/code/kernel-dev/linux/drivers/hid/hid-core.c:2426 /media/wd/code/kernel-dev/linux/drivers/hid/hid-core.c:2417) hid
jun 01 20:03:15 debbook kernel: mt_probe (/media/wd/code/kernel-dev/linux/drivers/hid/hid-multitouch.c:2028) hid_multitouch
jun 01 20:03:15 debbook kernel: ? devres_open_group (./include/linux/spinlock.h:408 ./include/linux/spinlock.h:619 drivers/base/devres.c:263 drivers/base/devres.c:617)
jun 01 20:03:15 debbook kernel: hid_device_probe (/media/wd/code/kernel-dev/linux/drivers/hid/hid-core.c:2822 /media/wd/code/kernel-dev/linux/drivers/hid/hid-core.c:2859) hid
jun 01 20:03:15 debbook kernel: really_probe (drivers/base/dd.c:631 drivers/base/dd.c:709)
jun 01 20:03:15 debbook kernel: ? __pfx___device_attach_driver (drivers/base/dd.c:908 (discriminator 1))
jun 01 20:03:15 debbook kernel: __driver_probe_device (drivers/base/dd.c:871)
jun 01 20:03:15 debbook kernel: driver_probe_device (drivers/base/dd.c:901)
jun 01 20:03:15 debbook kernel: __device_attach_driver (drivers/base/dd.c:1029)
jun 01 20:03:15 debbook kernel: bus_for_each_drv (drivers/base/bus.c:500)
jun 01 20:03:15 debbook kernel: __device_attach (drivers/base/dd.c:1101)
jun 01 20:03:15 debbook kernel: ? __pfx___hid_bus_reprobe_drivers (/media/wd/code/kernel-dev/linux/drivers/hid/hid-core.c:3111) hid
jun 01 20:03:15 debbook kernel: device_reprobe (drivers/base/bus.c:847 drivers/base/bus.c:881)
jun 01 20:03:15 debbook kernel: ? __hid_bus_reprobe_drivers (/media/wd/code/kernel-dev/linux/drivers/hid/hid-core.c:3094) hid
jun 01 20:03:15 debbook kernel: bus_for_each_dev (drivers/base/bus.c:383)
jun 01 20:03:15 debbook kernel: ? __pfx___hid_bus_driver_added (/media/wd/code/kernel-dev/linux/drivers/hid/hid-core.c:2900) hid
jun 01 20:03:15 debbook kernel: __hid_bus_driver_added (/media/wd/code/kernel-dev/linux/drivers/hid/hid-core.c:3106) hid
jun 01 20:03:15 debbook kernel: bus_for_each_drv (drivers/base/bus.c:500)
jun 01 20:03:15 debbook kernel: ? __pfx_sensor_hub_driver_init (hid-sensor-hub.mod.c:?) hid_sensor_hub
jun 01 20:03:15 debbook kernel: __hid_register_driver (/media/wd/code/kernel-dev/linux/drivers/hid/hid-core.c:3134 /media/wd/code/kernel-dev/linux/drivers/hid/hid-core.c:3118) hid
jun 01 20:03:15 debbook kernel: do_one_initcall (init/main.c:1392)
jun 01 20:03:15 debbook kernel: do_init_module (kernel/module/main.c:3106)
jun 01 20:03:15 debbook kernel: init_module_from_file (kernel/module/main.c:3777)
jun 01 20:03:15 debbook kernel: idempotent_init_module (kernel/module/main.c:3789)
jun 01 20:03:15 debbook kernel: __x64_sys_finit_module (kernel/module/main.c:3815 kernel/module/main.c:3799 kernel/module/main.c:3799)
jun 01 20:03:15 debbook kernel: do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
jun 01 20:03:15 debbook kernel: ? do_sys_openat2 (./include/linux/fs.h:2553 fs/open.c:1363)
jun 01 20:03:15 debbook kernel: ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
jun 01 20:03:15 debbook kernel: ? do_syscall_64 (./arch/x86/include/asm/entry-common.h:63 ./include/linux/irq-entry-common.h:210 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
jun 01 20:03:15 debbook kernel: ? do_syscall_64 (./arch/x86/include/asm/entry-common.h:63 ./include/linux/irq-entry-common.h:210 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
jun 01 20:03:15 debbook kernel: ? do_syscall_64 (./arch/x86/include/asm/entry-common.h:63 ./include/linux/irq-entry-common.h:210 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
jun 01 20:03:15 debbook kernel: ? __x64_sys_openat (fs/open.c:1370 fs/open.c:1386 fs/open.c:1381 fs/open.c:1381)
jun 01 20:03:15 debbook kernel: ? __fput (./include/linux/percpu_counter.h:71 ./include/linux/percpu_counter.h:272 fs/file_table.c:99 fs/file_table.c:523)
jun 01 20:03:15 debbook kernel: ? __x64_sys_close (fs/open.c:1507 fs/open.c:1492 fs/open.c:1492)
jun 01 20:03:15 debbook kernel: ? do_syscall_64 (./arch/x86/include/asm/entry-common.h:63 ./include/linux/irq-entry-common.h:210 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
jun 01 20:03:15 debbook kernel: ? from_kgid_munged (kernel/user_namespace.c:406 kernel/user_namespace.c:512 kernel/user_namespace.c:536)
jun 01 20:03:15 debbook kernel: ? __do_sys_getgid (kernel/sys.c:1042 (discriminator 2))
jun 01 20:03:15 debbook kernel: ? do_syscall_64 (./arch/x86/include/asm/entry-common.h:63 ./include/linux/irq-entry-common.h:210 ./include/linux/irq-entry-common.h:230 ./include/linux/entry-common.h:318 arch/x86/entry/syscall_64.c:100)
jun 01 20:03:15 debbook kernel: ? do_syscall_64 (./include/linux/randomize_kstack.h:57 arch/x86/entry/syscall_64.c:92)
jun 01 20:03:15 debbook kernel: entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
jun 01 20:03:15 debbook kernel: RIP: 0033:0x7fe5affd3c69
jun 01 20:03:15 debbook kernel: Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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> >
All code
========
0: ff c3 inc %ebx
2: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
9: 00 00 00
c: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
11: 48 89 f8 mov %rdi,%rax
14: 48 89 f7 mov %rsi,%rdi
17: 48 89 d6 mov %rdx,%rsi
1a: 48 89 ca mov %rcx,%rdx
1d: 4d 89 c2 mov %r8,%r10
20: 4d 89 c8 mov %r9,%r8
23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9
28: 0f 05 syscall
2a:* 48 rex.W <-- trapping instruction
...
Code starting with the faulting instruction
===========================================
0: 48 rex.W
...
jun 01 20:03:15 debbook kernel: RSP: 002b:00007ffc4716a3d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
jun 01 20:03:15 debbook kernel: RAX: ffffffffffffffda RBX: 0000555df96b8430 RCX: 00007fe5affd3c69
jun 01 20:03:15 debbook kernel: RDX: 0000000000000004 RSI: 00007fe5afd7344d RDI: 0000000000000050
jun 01 20:03:15 debbook kernel: RBP: 0000000000000004 R08: 0000000000000000 R09: 0000555df962b170
jun 01 20:03:15 debbook kernel: R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000020000
jun 01 20:03:15 debbook kernel: R13: 00007fe5afd7344d R14: 0000555df96bb2e0 R15: 0000000000000000
jun 01 20:03:15 debbook kernel: </TASK>
jun 01 20:03:15 debbook kernel: Modules linked in: hid_sensor_hub(+) drm_buddy amdxcp drm_panel_backlight_quirks gpu_sched drm_ttm_helper ttm drm_exec i2c_algo_bit drm_s>
```
Thanks,
Rafael Passos