I have an old 32 bit laptop with a BCM4401-B0 100Base-TX ethernet
controller. For every kernel from 4.19-rc1 going forward, I get a
warning and call trace within a few seconds of start up (see dmesg
snippet below). I have traced it to a specific commit (see commit
below). On the face of it, I would think it is a regression, but it
doesn't seem to cause a problem, since networking over ethernet is working.
I might not have noticed the warning except for the fact that something
in the 4.19 time frame is causing this laptop to be unstable. I still
have to identify the source of the instability. The laptop appears
stable with this commit but not with 4.19-rc7 or more recent kernels.
I thought I should at least ask if the following warning is an issue. If
it is, I am happy to help with creating a proper bug report as well as
debugging and testing. Is this an issue that should be addressed to the
netdev or linux-wireless lists, or both, since it appears to be an
interaction between the b44 driver which belongs to netdev and the ssb
driver which belongs to linux-wireless?
--- Begin dmesg snippet ---
[ 5.145764] ssb: Found chip with id 0x4318, rev 0x02 and package 0x02
[ 5.265914] b43-pci-bridge 0000:02:03.0: Sonics Silicon Backplane
found on PCI device 0000:02:03.0
[ 5.353718] ssb: Found chip with id 0x4401, rev 0x02 and package 0x00
[ 5.421787] WARNING: CPU: 0 PID: 157 at drivers/ssb/driver_gpio.c:464
ssb_gpio_init+0xa0/0xb0 [ssb]
[ 5.425679] Modules linked in: b44(+) psmouse pata_acpi ssb mii
[ 5.425679] CPU: 0 PID: 157 Comm: systemd-udevd Not tainted
4.19.31-041931-generic #201903231635
[ 5.425679] Hardware name: Dell Inc. ME051
/0DK344, BIOS A10 11/07/2006
[ 5.425679] EIP: ssb_gpio_init+0xa0/0xb0 [ssb]
[ 5.425679] Code: 00 31 c0 85 c9 0f 95 c0 31 c9 f7 d8 89 82 18 05 00
00 8d 82 d8 04 00 00 6a 00 e8 1b b6 17 dd 5a c9 c3 8d b4 26 00 00 00 00
90 <0f> 0b c9 b8 ff ff ff ff c3 8d b4 26 00 00 00 00 3e 8d 74 26 00 55
[ 5.425679] EAX: f58a3800 EBX: f58a3800 ECX: 00000000 EDX: f7e1ef94
[ 5.425679] ESI: 00000000 EDI: f58a3800 EBP: f585bc80 ESP: f585bc80
[ 5.425679] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010246
[ 5.425679] CR0: 80050033 CR2: b7ab702b CR3: 3586c000 CR4: 000006f0
[ 5.425679] Call Trace:
[ 5.425679] ssb_attach_queued_buses+0xe2/0x310 [ssb]
[ 5.425679] ssb_bus_register+0x167/0x1c0 [ssb]
[ 5.425679] ? ssb_pci_xtal+0x1d0/0x1d0 [ssb]
[ 5.425679] ssb_bus_pcibus_register+0x29/0x80 [ssb]
[ 5.425679] ssb_pcihost_probe+0xb7/0x110 [ssb]
[ 5.425679] ? ssb_pcihost_remove+0x40/0x40 [ssb]
[ 5.425679] pci_device_probe+0xc7/0x160
[ 5.425679] really_probe+0x1fe/0x390
[ 5.425679] driver_probe_device+0xe1/0x120
[ 5.425679] ? pci_match_device+0xde/0x110
[ 5.425679] ? _cond_resched+0x17/0x30
[ 5.425679] __driver_attach+0xd9/0x100
[ 5.425679] ? driver_probe_device+0x120/0x120
[ 5.425679] bus_for_each_dev+0x5b/0xa0
[ 5.425679] driver_attach+0x19/0x20
[ 5.425679] ? driver_probe_device+0x120/0x120
[ 5.425679] bus_add_driver+0x117/0x210
[ 5.425679] ? pci_bus_num_vf+0x20/0x20
[ 5.425679] driver_register+0x66/0xb0
[ 5.425679] ? 0xf8365000
[ 5.425679] __pci_register_driver+0x3d/0x40
[ 5.425679] ssb_pcihost_register+0x2c/0x30 [ssb]
[ 5.425679] b44_init+0x1d/0x1000 [b44]
[ 5.425679] do_one_initcall+0x42/0x19a
[ 5.425679] ? vunmap_page_range+0x1c9/0x260
[ 5.425679] ? free_pcp_prepare+0x5d/0xf0
[ 5.425679] ? _cond_resched+0x17/0x30
[ 5.425679] ? kmem_cache_alloc_trace+0x15f/0x1b0
[ 5.425679] ? do_init_module+0x21/0x210
[ 5.425679] ? do_init_module+0x21/0x210
[ 5.425679] do_init_module+0x50/0x210
[ 5.425679] load_module+0x1368/0x1630
[ 5.425679] ? security_kernel_post_read_file+0x54/0x60
[ 5.425679] sys_finit_module+0x8a/0xe0
[ 5.425679] do_fast_syscall_32+0x87/0x1e0
[ 5.425679] entry_SYSENTER_32+0x6b/0xbe
[ 5.425679] EIP: 0xb7eead61
[ 5.425679] Code: f6 ff ff 55 89 e5 8b 55 08 8b 80 5c cd ff ff 85 d2
74 02 89 02 5d c3 8b 04 24 c3 8b 1c 24 c3 90 90 51 52 55 89 e5 0f 34 cd
80 <5d> 5a 59 c3 90 90 90 90 8d 76 00 58 b8 77 00 00 00 cd 80 90 8d 76
[ 5.425679] EAX: ffffffda EBX: 0000000d ECX: b7cfda15 EDX: 00000000
[ 5.425679] ESI: 00fcaf40 EDI: 00fcca40 EBP: 00000000 ESP: bfa404dc
[ 5.425679] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000296
[ 5.425679] ---[ end trace b0d87e1b3433e0ca ]---
[ 6.245890] b44 0000:02:00.0: Sonics Silicon Backplane found on PCI
device 0000:02:00.0
[ 6.260263] b44: Broadcom 44xx/47xx 10/100 PCI ethernet driver
version 2.0
[ 6.299684] b44 ssb1:0 eth0: Broadcom 44xx/47xx 10/100 PCI ethernet
driver 00:14:22:af:83:9b
[ 6.367622] random: fast init done
--- End dmesg snippet ---
--- Begin commit ---
commit 209b43759d65b2cc99ce7757249aacc82b03c4e2
Author: Michael Büsch <m@xxxxxxx>
Date: Tue Jul 31 22:15:09 2018 +0200
ssb: Remove SSB_WARN_ON, SSB_BUG_ON and SSB_DEBUG
Use the standard WARN_ON instead.
If a small kernel is desired, WARN_ON can be disabled globally.
Also remove SSB_DEBUG. Besides WARN_ON it only adds a tiny debug check.
Include this check unconditionally.
Signed-off-by: Michael Buesch <m@xxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
--- End commit ---
