Reboot crash at msm_atomic_commit_tail

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Hi,

I have noticed that on an imx53-qsb, it is no longer possible to
reboot the system as it fails like this:

Requesting system reboot
[   23.819116] cfg80211: failed to load regulatory.db
[   23.827569] imx-sdma 63fb0000.sdma: external firmware not found,
using ROM firmware
[   23.956838] ci_hdrc ci_hdrc.0: remove, state 1
[   23.968029] usb usb1: USB disconnect, device number 1
[   23.976033] usb 1-1: USB disconnect, device number 2
[   24.234253] ci_hdrc ci_hdrc.0: USB bus 1 deregistered
[   24.268964] 8<--- cut here ---
[   24.274602] Unable to handle kernel NULL pointer dereference at
virtual address 00000000
[   24.283434] pgd = (ptrval)
[   24.286387] [00000000] *pgd=ca212831
[   24.290788] Internal error: Oops: 17 [#1] SMP ARM
[   24.295609] Modules linked in:
[   24.298777] CPU: 0 PID: 197 Comm: init Not tainted
5.11.0-rc2-next-20210111 #333
[   24.306276] Hardware name: Freescale i.MX53 (Device Tree Support)
[   24.312442] PC is at msm_atomic_commit_tail+0x54/0xb9c
[   24.317743] LR is at commit_tail+0xa4/0x1b0
[   24.322032] pc : [<c0769b78>]    lr : [<c06db0b4>]    psr: 60000013
[   24.328374] sp : c28d1d50  ip : c23a3000  fp : 00000000
[   24.333670] r10: c2816780  r9 : c12d71c0  r8 : c17fb018
[   24.338967] r7 : c23a3000  r6 : c2816780  r5 : 00000000  r4 : 00000000
[   24.345572] r3 : c24c2c00  r2 : c23a3000  r1 : c0769b24  r0 : 00000000
[   24.352177] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[   24.359407] Control: 10c5387d  Table: 72858019  DAC: 00000051
[   24.365220] Process init (pid: 197, stack limit = 0x(ptrval))
[   24.371052] Stack: (0xc28d1d50 to 0xc28d2000)
[   24.375508] 1d40:                                     ffffffff
00000000 9682f000 00000005
[   24.383794] 1d60: 3031e53d 00000000 00000dc0 c0f816d8 c23a3000
c23a3000 00000000 c17fb018
[   24.392079] 1d80: c12d71c0 c2816780 00000000 c06db0b4 a5f7faba
00000005 00000000 c2816780
[   24.400363] 1da0: 00000000 c23a3000 00000000 c17fb018 c12d71c0
c24c20a0 00000000 c06dbed0
[   24.408647] 1dc0: 00000000 00000000 c2816780 c23a349c c2816780
c28d1dfc c23a34a4 c06db604
[   24.416932] 1de0: c23a3000 00000000 c1609388 c12ba9dc c17fb018
c06db704 c2965e80 c2965e80
[   24.425214] 1e00: 00000008 00000001 00000000 00000000 c175f454
00000000 c175f458 c1c669cc
[   24.433498] 1e20: 00000000 c12bebb8 00000000 00000001 00000008
00000000 c23a32ec c23a32ec
[   24.441783] 1e40: 00000000 433f193b c24c2014 c24c2014 c24c2010
c17674c8 c1e68bec c07c76e8
[   24.450067] 1e60: 00000000 c16158d8 c1609388 fee1dead 00000000
c28d0000 00000058 c0153730
[   24.458350] 1e80: 01234567 c01539d4 fffffffe 00000000 00000000
00000000 00000000 00000000
[   24.466633] 1ea0: 00000000 00000000 00000000 00000000 00000000
ffffffff 00000000 c1609388
[   24.474917] 1ec0: c29663c8 00000000 00000000 c0e17954 ffffe000
ffffffff 00000001 ffffffff
[   24.483200] 1ee0: c1609388 c1609388 c16093d4 433f193b 00000000
c1581584 ffffe000 1ea51000
[   24.491485] 1f00: 00000001 00000080 c1609388 c1609794 c29663c8
00000000 00000000 c0e17954
[   24.499769] 1f20: 00000000 ffffffff 00000000 c1609388 c1609388
c16093d4 00000000 c1609388
[   24.508054] 1f40: c29663c8 c0183f24 c2965e80 c1609388 00000001
c1609794 c2995090 c018ce7c
[   24.516337] 1f60: 00000001 c2995080 c0136e80 c010012c 00000000
00000001 c158b21c c0e22334
[   24.524622] 1f80: c158b21c c010019c c1609794 433f193b 00000000
beefefd4 00000001 00000058
[   24.532907] 1fa0: c0100264 c0100080 00000000 beefefd4 fee1dead
28121969 01234567 00000000
[   24.541191] 1fc0: 00000000 beefefd4 00000001 00000058 00000000
00000000 b6f1ef74 00000000
[   24.549476] 1fe0: 000d7298 beefed40 00091a48 b6e8894c 60000010
fee1dead 00000000 00000000
[   24.557742] [<c0769b78>] (msm_atomic_commit_tail) from [<c06db0b4>]
(commit_tail+0xa4/0x1b0)
[   24.566349] [<c06db0b4>] (commit_tail) from [<c06dbed0>]
(drm_atomic_helper_commit+0x154/0x188)
[   24.575193] [<c06dbed0>] (drm_atomic_helper_commit) from
[<c06db604>] (drm_atomic_helper_disable_all+0x154/0x1c0)
[   24.585599] [<c06db604>] (drm_atomic_helper_disable_all) from
[<c06db704>] (drm_atomic_helper_shutdown+0x94/0x12c)
[   24.596094] [<c06db704>] (drm_atomic_helper_shutdown) from
[<c07c76e8>] (device_shutdown+0x118/0x250)
[   24.605475] [<c07c76e8>] (device_shutdown) from [<c0153730>]
(kernel_restart+0xc/0x68)
[   24.613574] [<c0153730>] (kernel_restart) from [<c01539d4>]
(__do_sys_reboot+0x144/0x200)
[   24.621915] [<c01539d4>] (__do_sys_reboot) from [<c0100080>]
(ret_fast_syscall+0x0/0x2c)
[   24.630160] Exception stack(0xc28d1fa8 to 0xc28d1ff0)
[   24.635315] 1fa0:                   00000000 beefefd4 fee1dead
28121969 01234567 00000000
[   24.643600] 1fc0: 00000000 beefefd4 00000001 00000058 00000000
00000000 b6f1ef74 00000000
[   24.651867] 1fe0: 000d7298 beefed40 00091a48 b6e8894c
[   24.657025] Code: 1592208c 1185521c e1530000 1afffff8 (e5942000)
[   24.663681] ---[ end trace 9a1e129deec83f42 ]---
[   25.670432] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x00000000
[   25.678331] ---[ end Kernel panic - not syncing: Attempted to kill
init! exitcode=0x00000000 ]---

It happens on 5.4 as well as 5.11-rc2.

Any ideas?

Thanks,

Fabio Estevam
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