Messages in this thread | | | From | Peter Rosin <> | Subject | RE: Regression: memory corruption on Atmel SAMA5D31 | Date | Tue, 21 Jun 2022 10:46:25 +0000 |
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2022-06-20 at 16:22, Tudor.Ambarus@microchip.com wrote: > >> >> git@github.com:ambarus/linux-0day.git, branch dma-regression-hdmac-v5.18-rc7-4th-attempt >> > > Hi, Peter, > > I've just forced pushed on this branch, I had a typo somewhere and with that fixed I could > no longer reproduce the bug. Tested for ~20 minutes. Would you please test last 3 patches > and tell me if you can still reproduce the bug?
Hi!
I rebased your patches onto my current branch which is v5.18.2 plus a few unrelated changes (at least they are unrelated after removing the previous workaround to disable nand-dma entirely).
The unrelated patches are two backports so that drivers recognize new compatibles [1][2], which should be completely harmless, plus a couple of proposed fixes that happens to fix eeprom issues with the at91 I2C driver from Codrin Ciubotariu [3].
On that kernel, I can still reproduce. It seems a bit harder to reproduce the problem now though. If the system is otherwise idle, the sha256sum test did not reproduce in a run of 150+ attempts, but if I let the "real" application run while I do the test, I get a failure rate of about 10%, see below. The real application burns some CPU (but not all of it) and communicates with HW using I2C, native UARTs and two of the four USB-serial ports (FTDI, with the latency set to 1ms as mentioned earlier), so I guess there is more DMA pressure or something? There is a 100mbps network connection, but it was left "idle" during this test.
Cheers, Peter
$ dd if=/dev/urandom of=testfile bs=1024 count=40000 40000+0 records in 40000+0 records out 40960000 bytes (41 MB, 39 MiB) copied, 80.0485 s, 512 kB/s $ while :; do cat testfile | sha256sum; done b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - a4850c1bb0226f14659035cdf1461c7df03d50bff8af560e3bd204942556b73f - 43c1941e15bd7e048e9d5f1d41ce67517cb6e59dae1d3af256d1507168100fcb - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - 4a35af384455853a24b943ef94353663e8c22a9aa29d2e275194fd544d0b194a - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - f6710849b36e6954c26ff62cd974ecb082b93fa6e53ecf0aea7e0c93acc0a445 - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - 2c2f4ac91f435439d2d640c34ee89b4d1ebf3adb8438efbf064a4139247241c5 - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - b93e0c56cfba75cb9e2b35ff6769abdb6c1a5d17cadc28cec1979188e044cf3d - ^C
[1] https://lore.kernel.org/linux-kernel/42db911c-5eba-0511-3e8c-8011a2a5b44a@axentia.se/ [2] https://lore.kernel.org/linux-kernel/ea4cd16b-4a04-8857-d08a-53be58b00d28@axentia.se/ [3] https://lore.kernel.org/linux-kernel/20220614101347.16910-1-codrin.ciubotariu@microchip.com/
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