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Date: Tue, 16 Aug 2022 12:55:20 +0100
From: Sudip Mukherjee <sudipm.mukherjee@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel <linux-kernel@...r.kernel.org>,
Stable <stable@...r.kernel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Guenter Roeck <linux@...ck-us.net>,
Shuah Khan <shuah@...nel.org>, patches@...nelci.org,
lkft-triage@...ts.linaro.org, Pavel Machek <pavel@...x.de>,
Jonathan Hunter <jonathanh@...dia.com>,
Florian Fainelli <f.fainelli@...il.com>, slade@...dewatkins.com
Subject: Re: [PATCH 5.18 0000/1095] 5.18.18-rc1 review
Hi Greg,
On Mon, Aug 15, 2022 at 7:55 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> This is the start of the stable review cycle for the 5.18.18 release.
> There are 1095 patches in this series, all will be posted as a response
> to this one. If anyone has any issues with these being applied, please
> let me know.
>
> Responses should be made by Wed, 17 Aug 2022 18:01:29 +0000.
> Anything received after that time might be too late.
Both v5.18.18-rc1 and v5.15.61-rc1 has hung task in RPI4B causing a
huge delay in bootup.
This is from v5.18.18-rc1.
[ 846.815074] INFO: task systemd-udevd:192 blocked for more than 724 seconds.
[ 846.822452] Tainted: G WC 5.18.18-rc1 #1
[ 846.828961] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 846.837557] task:systemd-udevd state:D stack: 0 pid: 192
ppid: 177 flags:0x00000009
[ 846.837582] Call trace:
[ 846.837589] __switch_to+0xf8/0x150
[ 846.837611] __schedule+0x3cc/0xa0c
[ 846.837623] schedule+0x68/0x104
[ 846.837634] schedule_preempt_disabled+0x30/0x4c
[ 846.837646] __mutex_lock.constprop.0+0x168/0x55c
[ 846.837658] __mutex_lock_slowpath+0x1c/0x30
[ 846.837669] mutex_lock+0x50/0x60
[ 846.837680] usb_udc_uevent+0x58/0xf0 [udc_core]
[ 846.837718] dev_uevent+0x134/0x2e0
[ 846.837732] kobject_uevent_env+0x298/0x764
[ 846.837744] kobject_uevent+0x14/0x20
[ 846.837753] device_add+0x398/0x8a0
[ 846.837764] usb_add_gadget+0x110/0x1bc [udc_core]
[ 846.837791] usb_add_gadget_udc+0x7c/0xc0 [udc_core]
[ 846.837817] dwc2_driver_probe+0x5e0/0x7a0 [dwc2]
[ 846.837869] platform_probe+0x74/0xd0
[ 846.837880] really_probe+0x180/0x3cc
[ 846.837893] __driver_probe_device+0x11c/0x190
[ 846.837905] driver_probe_device+0x44/0xf4
[ 846.837917] __driver_attach+0xd8/0x1b0
[ 846.837930] bus_for_each_dev+0x7c/0xe0
[ 846.837941] driver_attach+0x30/0x40
[ 846.837953] bus_add_driver+0x154/0x240
[ 846.837964] driver_register+0x84/0x140
[ 846.837977] __platform_driver_register+0x34/0x40
[ 846.837987] dwc2_platform_driver_init+0x2c/0x1000 [dwc2]
[ 846.838035] do_one_initcall+0x50/0x2c0
[ 846.838047] do_init_module+0x50/0x260
[ 846.838061] load_module+0x2298/0x2720
[ 846.838074] __do_sys_finit_module+0xac/0x12c
[ 846.838087] __arm64_sys_finit_module+0x2c/0x40
[ 846.838099] invoke_syscall+0x50/0x120
[ 846.838113] el0_svc_common.constprop.0+0x6c/0x1a0
[ 846.838126] do_el0_svc+0x30/0x90
[ 846.838138] el0_svc+0x30/0xd0
[ 846.838147] el0t_64_sync_handler+0x10c/0x140
[ 846.838158] el0t_64_sync+0x1a0/0x1a4
[ 846.838179] INFO: task udevadm:964 blocked for more than 362 seconds.
[ 846.845473] Tainted: G WC 5.18.18-rc1 #1
[ 846.851891] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 846.860543] task:udevadm state:D stack: 0 pid: 964
ppid: 1 flags:0x00000000
[ 846.860555] Call trace:
[ 846.860560] __switch_to+0xf8/0x150
[ 846.860569] __schedule+0x3cc/0xa0c
[ 846.860576] schedule+0x68/0x104
[ 846.860582] schedule_preempt_disabled+0x30/0x4c
[ 846.860589] __mutex_lock.constprop.0+0x168/0x55c
[ 846.860596] __mutex_lock_slowpath+0x1c/0x30
[ 846.860603] mutex_lock+0x50/0x60
[ 846.860610] usb_udc_uevent+0x58/0xf0 [udc_core]
[ 846.860629] dev_uevent+0x134/0x2e0
[ 846.860637] uevent_show+0x98/0x124
[ 846.860643] dev_attr_show+0x2c/0x6c
[ 846.860649] sysfs_kf_seq_show+0x98/0x110
[ 846.860656] kernfs_seq_show+0x38/0x44
[ 846.860664] seq_read_iter+0x170/0x48c
[ 846.860674] kernfs_fop_read_iter+0x198/0x1d4
[ 846.860681] new_sync_read+0xd8/0x15c
[ 846.860689] vfs_read+0x19c/0x1e4
[ 846.860697] ksys_read+0x78/0x110
[ 846.860704] __arm64_sys_read+0x28/0x34
[ 846.860711] invoke_syscall+0x50/0x120
[ 846.860719] el0_svc_common.constprop.0+0x6c/0x1a0
[ 846.860727] do_el0_svc+0x30/0x90
[ 846.860734] el0_svc+0x30/0xd0
[ 846.860740] el0t_64_sync_handler+0x10c/0x140
[ 846.860746] el0t_64_sync+0x1a0/0x1a4
Apart from the call trace from the hung task I can also see another warning.
[ 14.841402] ------------[ cut here ]------------
[ 14.845855] Bluetooth: HCI UART protocol ATH3K registered
[ 14.851200] WARNING: CPU: 0 PID: 184 at
drivers/gpu/drm/vc4/vc4_hdmi_regs.h:450 vc5_hdmi_reset+0x1f4/0x234
[vc4]
[ 14.867061] Bluetooth: HCI UART protocol Three-wire (H5) registered
[ 14.876900] Modules linked in: brcmfmac(+) hci_uart(+) brcmutil
btqca bcm2835_v4l2(C) btrtl btbcm btintel bcm2835_mmal_vchiq(C)
videobuf2_vmalloc vc4(+) raspberrypi_hwmon cfg80211 cec
videobuf2_memops videobuf2_v4l2 drm_cma_helper videobuf2_common
bluetooth xhci_pci(+) drm_kms_helper drm dwc2(+) udc_core ecdh_generic
snd_soc_core snd_bcm2835(C) i2c_brcmstb roles videodev ecc ac97_bus
snd_pcm_dmaengine snd_pcm pwm_bcm2835 mc snd_timer xhci_pci_renesas
snd fb_sys_fops syscopyarea sysfillrect crct10dif_ce phy_generic
uio_pdrv_genirq sysimgblt uio aes_neon_bs aes_neon_blk
[ 14.934380] CPU: 0 PID: 184 Comm: systemd-udevd Tainted: G
C 5.18.18-rc1 #1
[ 14.942761] Hardware name: Raspberry Pi 4 Model B (DT)
[ 14.947969] pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 14.955031] pc : vc5_hdmi_reset+0x1f4/0x234 [vc4]
[ 14.959837] lr : vc5_hdmi_reset+0x38/0x234 [vc4]
[ 14.964548] sp : ffff80000a7b3640
[ 14.967902] x29: ffff80000a7b3640 x28: 0000000000000000 x27: ffff000056c35080
[ 14.975140] x26: ffff80000136db78 x25: ffff80000136e078 x24: 0000000000000000
[ 14.976233] Bluetooth: HCI UART protocol Intel registered
[ 14.982376] x23: ffff000058479000 x22: ffff0000fb836da0 x21: ffff000056c35c90
[ 14.982383] x20: 0000000000000000 x19: ffff000056c35080 x18: 0000000000000014
[ 14.982389] x17: 00000000f19a3ea9 x16: 00000000b24d2d64 x15: 000000006490e735
[ 14.982396] x14: 0000000000000000 x13: 00000000d43c985e x12: 00000000f1020f23
[ 14.982402] x11: 00000000d1b738e5 x10: ffff8400035fbc7f x9 : ffff800001357768
[ 14.982408] x8 : 0101010101010101 x7 : 0000000000000000 x6 : ffff000055ade180
[ 14.982414] x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
[ 14.982420] x2 : 0000000000000001 x1 : 0000000000000002 x0 : ffff80000136f7f0
[ 15.026130] Bluetooth: HCI UART protocol Broadcom registered
[ 15.031261]
[ 15.031263] Call trace:
[ 15.031265] vc5_hdmi_reset+0x1f4/0x234 [vc4]
[ 15.041432] Bluetooth: HCI UART protocol QCA registered
[ 15.045761] vc4_hdmi_runtime_resume+0x74/0x2d0 [vc4]
[ 15.045798] vc4_hdmi_bind+0x244/0xa60 [vc4]
[ 15.074641] component_bind_all+0x114/0x26c
[ 15.078887] vc4_drm_bind+0x1d8/0x2c0 [vc4]
[ 15.083159] try_to_bring_up_aggregate_device+0x200/0x2d4
[ 15.085085] Bluetooth: HCI UART protocol AG6XX registered
[ 15.088635] component_master_add_with_match+0xcc/0x110
[ 15.088639] vc4_platform_drm_probe+0xc8/0x100 [vc4]
[ 15.104457] platform_probe+0x74/0xd0
[ 15.108169] really_probe+0x180/0x3cc
[ 15.111881] __driver_probe_device+0x11c/0x190
[ 15.114311] Bluetooth: HCI UART protocol Marvell registered
[ 15.116384] driver_probe_device+0x44/0xf4
[ 15.116390] __driver_attach+0xd8/0x1b0
[ 15.116396] bus_for_each_dev+0x7c/0xe0
[ 15.116401] driver_attach+0x30/0x40
[ 15.116406] bus_add_driver+0x154/0x240
[ 15.116410] driver_register+0x84/0x140
[ 15.116416] __platform_driver_register+0x34/0x40
[ 15.116419] vc4_drm_register+0x60/0x1000 [vc4]
[ 15.154701] do_one_initcall+0x50/0x2c0
[ 15.158590] do_init_module+0x50/0x260
[ 15.162391] load_module+0x2298/0x2720
[ 15.166189] __do_sys_finit_module+0xac/0x12c
[ 15.170604] __arm64_sys_finit_module+0x2c/0x40
[ 15.175196] invoke_syscall+0x50/0x120
[ 15.178995] el0_svc_common.constprop.0+0x6c/0x1a0
[ 15.183851] do_el0_svc+0x30/0x90
[ 15.187208] el0_svc+0x30/0xd0
[ 15.190301] el0t_64_sync_handler+0x10c/0x140
[ 15.194715] el0t_64_sync+0x1a0/0x1a4
[ 15.198424] ---[ end trace 0000000000000000 ]---
[ 15.203150] ------------[ cut here ]------------
I can see similar trace with hung task of systemd-udevd in
v5.15.61-rc1 also, but not the other warning.
I am on holiday, might not be able to bisect to find the offending commit.
--
Regards
Sudip
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