Re: next/master bisection: baseline.login on r8a77960-ulcb

[Thierry Reding]

On Wed, Feb 24, 2021 at 10:39:42PM +0100, Heiko Thiery wrote:
> Hi Christoph and all,
> 
> On 23.02.21 10:56, Guillaume Tucker wrote:
> > Hi Christoph,
> > 
> > Please see the bisection report below about a boot failure on
> > r8a77960-ulcb on next-20210222.
> > 
> > Reports aren't automatically sent to the public while we're
> > trialing new bisection features on kernelci.org but this one
> > looks valid.
> > 
> > The log shows a kernel panic, more details can be found here:
> > 
> >    https://kernelci.org/test/case/id/6034bde034504edc9faddd2c/
> > 
> > Please let us know if you need any help to debug the issue or try
> > a fix on this platform.
> 
> I am also seeing this problem on an iMX8MQ board and can help test if you
> have a fix.

This is also causing boot failures on Jetson AGX Xavier. The origin is
slightly different from the above kernelci.org report, but the BUG_ON is
the same:

    [    2.650447] ------------[ cut here ]------------
    [    2.650588] kernel BUG at include/linux/iommu-helper.h:23!
    [    2.650729] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
    [    2.654330] Modules linked in:
    [    2.657474] CPU: 2 PID: 67 Comm: kworker/2:1 Not tainted 5.11.0-next-20210225-00025-gfd15609b3a81-dirty #120
    [    2.667367] Hardware name: NVIDIA Jetson AGX Xavier Developer Kit (DT)
    [    2.674096] Workqueue: events deferred_probe_work_func
    [    2.679169] pstate: 40400089 (nZcv daIf +PAN -UAO -TCO BTYPE=--)
    [    2.684949] pc : find_slots.isra.0+0x118/0x2f0
    [    2.689494] lr : find_slots.isra.0+0x88/0x2f0
    [    2.693696] sp : ffff800011faf950
    [    2.697281] x29: ffff800011faf950 x28: 0000000000000001
    [    2.702537] x27: 0000000000000001 x26: 0000000000000000
    [    2.708131] x25: 0000000000000001 x24: 0000000105f03148
    [    2.713556] x23: 0000000000000001 x22: ffff800011559000
    [    2.718835] x21: ffff800011559a80 x20: 00000000edc00000
    [    2.724493] x19: 0000000000000000 x18: 0000000000000020
    [    2.729770] x17: ffff0003ffd7d160 x16: 0000000000000068
    [    2.735173] x15: ffff000080b43150 x14: ffffffffffffffff
    [    2.740944] x13: ffff000082b5d791 x12: 0000000000000040
    [    2.746113] x11: ffff0000a0000248 x10: 0000000000000000
    [    2.751882] x9 : 0000000000000000 x8 : ffff0003fed30000
    [    2.757139] x7 : 0000000000000000 x6 : 0000000000000000
    [    2.762818] x5 : 0000000000000000 x4 : 0000000000000000
    [    2.767984] x3 : 00000001e8303148 x2 : 0000000000008000
    [    2.773580] x1 : ffffffffffffffff x0 : 00000000001db800
    [    2.778662] Call trace:
    [    2.781136]  find_slots.isra.0+0x118/0x2f0
    [    2.785137]  swiotlb_tbl_map_single+0x80/0x1b4
    [    2.789858]  swiotlb_map+0x58/0x200
    [    2.793355]  dma_direct_map_page+0x148/0x1c0
    [    2.797386]  dma_map_page_attrs+0x2c/0x54
    [    2.801411]  dw_pcie_host_init+0x40c/0x4c0
    [    2.805633]  tegra_pcie_config_rp+0x7c/0x1f4
    [    2.810155]  tegra_pcie_dw_probe+0x3d0/0x60c
    [    2.814185]  platform_probe+0x68/0xe0
    [    2.817688]  really_probe+0xe4/0x4c0
    [    2.821362]  driver_probe_device+0x58/0xc0
    [    2.825386]  __device_attach_driver+0xa8/0x104
    [    2.829953]  bus_for_each_drv+0x78/0xd0
    [    2.833434]  __device_attach+0xdc/0x17c
    [    2.837631]  device_initial_probe+0x14/0x20
    [    2.841680]  bus_probe_device+0x9c/0xa4
    [    2.845160]  deferred_probe_work_func+0x74/0xb0
    [    2.849734]  process_one_work+0x1cc/0x350
    [    2.853822]  worker_thread+0x20c/0x3ac
    [    2.858018]  kthread+0x128/0x134
    [    2.860997]  ret_from_fork+0x10/0x34
    [    2.864508] Code: ca180063 ea06007f 54fffee1 b50001e7 (d4210000)
    [    2.870547] ---[ end trace e5c50bdcf12b316e ]---
    [    2.875087] note: kworker/2:1[67] exited with preempt_count 2
    [    2.880836] ------------[ cut here ]------------

I've confirmed that reverting the following commits makes the system
boot again:

    47cfc5be1934 ("swiotlb: Validate bounce size in the sync/unmap path")
    c6f50c7719e7 ("swiotlb: respect min_align_mask")
    e952d9a1bc20 ("swiotlb: don't modify orig_addr in swiotlb_tbl_sync_single")
    567d877f9a7d ("swiotlb: refactor swiotlb_tbl_map_single")

Let me know if I can help test any fixes for this.

Thierry

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