Bug 1980171 Comment 0 Edit History

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Original comment by
on 
Nightly 143.0a1, buildID 20250726091124

STR:
1. Have a Firefox open.
2. Open the Firefox in another instance, e.g. `mkdir /tmp/prof && "/Applications/Firefox Nightly.app/Contents/MacOS/firefox" -profile /tmp/prof`
3. Go back to the Firefox from step 1. Try to visit a domain that you have not visited before (in the past few minutes). E.g. search for something in DuckDuckGo.

Expected:
- Should load.

Actual:
- Often fails to load. While trying to reproduce, I found that it fails multiple times in succession, but sometimes succeeds (on retry).
- Quitting the other Firefox instance (from step 3) makes the issue go away.
- In the devtools, I see `NS_ERROR_FAILURE`.

I visited `about:logging` and logged to disk with the network preset. In the logs that fail, I consistently observe the presence of `ErrorAccordingToNSPR [in=-5999 out=80004005]` logged from https://searchfox.org/mozilla-central/rev/ab26427a8d31be475be11bbae0e04c84cc7f20ef/netwerk/base/nsSocketTransport2.cpp#227-230,251-252
- `-5999` there is `PR_BAD_DESCRIPTOR_ERROR`.
- `80004005` is the hex code of 2147500037, aka `NS_ERROR_FAILURE`

```
2025-07-30 12:49:35.929894 UTC - [Parent 54986: Main Thread]: D/nsHttp sending progress and status notification [this=424580800 status=4b0007 progress=0/0]
2025-07-30 12:49:35.929980 UTC - [Parent 54986: Socket Thread]: D/nsSocketTransport ErrorAccordingToNSPR [in=-5999 out=80004005]
2025-07-30 12:49:35.929991 UTC - [Parent 54986: Socket Thread]: D/nsSocketTransport   connection failed! [reason=80004005]
2025-07-30 12:49:35.929992 UTC - [Parent 54986: Socket Thread]: D/nsSocketTransport nsSocketTransportService::DetachSocket [handler=41405d600]
2025-07-30 12:49:35.929995 UTC - [Parent 54986: Socket Thread]: D/nsSocketTransport nsSocketTransport::OnSocketDetached [this=41405d600 cond=80004005]
2025-07-30 12:49:35.929997 UTC - [Parent 54986: Socket Thread]: D/nsSocketTransport nsSocketTransport::RecoverFromError [this=41405d600 state=3 cond=80004005]
2025-07-30 12:49:35.930000 UTC - [Parent 54986: Socket Thread]: D/nsHostResolver Adding address to blocklist for host [duckduckgo.com], host record [4525ecdf0].used trr=0
2025-07-30 12:49:35.930003 UTC - [Parent 54986: Socket Thread]: D/nsHostResolver Successfully adding address [52.142.124.215] to blocklist for host [duckduckgo.com].
```
Revision 1 by
on 
Nightly 143.0a1, buildID 20250726091124

STR:
1. Have a Firefox open.
2. Open the Firefox in another instance, e.g. `mkdir /tmp/prof && "/Applications/Firefox Nightly.app/Contents/MacOS/firefox" -profile /tmp/prof`
    - EDIT: I am now in a state where this step is not even needed. The necessity of this step is unclear.
3. Go back to the Firefox from step 1. Try to visit a domain that you have not visited before (in the past few minutes). E.g. search for something in DuckDuckGo.

Expected:
- Should load.

Actual:
- Often fails to load. While trying to reproduce, I found that it fails multiple times in succession, but sometimes succeeds (on retry).
- Quitting the other Firefox instance (from step 3) makes the issue go away.
- In the devtools, I see `NS_ERROR_FAILURE`.

I visited `about:logging` and logged to disk with the network preset. In the logs that fail, I consistently observe the presence of `ErrorAccordingToNSPR [in=-5999 out=80004005]` logged from https://searchfox.org/mozilla-central/rev/ab26427a8d31be475be11bbae0e04c84cc7f20ef/netwerk/base/nsSocketTransport2.cpp#227-230,251-252
- `-5999` there is `PR_BAD_DESCRIPTOR_ERROR`.
- `80004005` is the hex code of 2147500037, aka `NS_ERROR_FAILURE`

```
2025-07-30 12:49:35.929894 UTC - [Parent 54986: Main Thread]: D/nsHttp sending progress and status notification [this=424580800 status=4b0007 progress=0/0]
2025-07-30 12:49:35.929980 UTC - [Parent 54986: Socket Thread]: D/nsSocketTransport ErrorAccordingToNSPR [in=-5999 out=80004005]
2025-07-30 12:49:35.929991 UTC - [Parent 54986: Socket Thread]: D/nsSocketTransport   connection failed! [reason=80004005]
2025-07-30 12:49:35.929992 UTC - [Parent 54986: Socket Thread]: D/nsSocketTransport nsSocketTransportService::DetachSocket [handler=41405d600]
2025-07-30 12:49:35.929995 UTC - [Parent 54986: Socket Thread]: D/nsSocketTransport nsSocketTransport::OnSocketDetached [this=41405d600 cond=80004005]
2025-07-30 12:49:35.929997 UTC - [Parent 54986: Socket Thread]: D/nsSocketTransport nsSocketTransport::RecoverFromError [this=41405d600 state=3 cond=80004005]
2025-07-30 12:49:35.930000 UTC - [Parent 54986: Socket Thread]: D/nsHostResolver Adding address to blocklist for host [duckduckgo.com], host record [4525ecdf0].used trr=0
2025-07-30 12:49:35.930003 UTC - [Parent 54986: Socket Thread]: D/nsHostResolver Successfully adding address [52.142.124.215] to blocklist for host [duckduckgo.com].
```

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