[29.x] Backports #34680

1. 
   fanquake commented at 10:11 am on February 26, 2026: member

   Backports:

   • #34093
   • #34510
   • #34561
   • #34671
2. doc: fix broken bpftrace installation link

   The bpftrace project moved from iovisor/bpftrace to bpftrace/bpftraceand
   removed the separate INSTALL.md file. Installation instructionsare now
   in the README.md Quick Start section.
   
   Github-Pull: #34510
   Rebased-From: 42ee31e80c99bdb4d6affdc9dc22a0f3d5da7b59

   5910bd3b5d
3. doc: Update Guix install for Debian/Ubuntu

   Fixes https://github.com/bitcoin/bitcoin/issues/33982
   
   Co-authored-by: Purple Ninja <129023353+ToRyVand@users.noreply.github.com>
   
   Github-Pull: #34671
   Rebased-From: faa70ca7642bd653cbd2e544c17fa58d2672afa4

   532afe909e
4. wallet: rpc: manpage: fix example missing `fee_rate` argument

   The function signature for the `send` RPC is:
   ```
   send [{"address":amount,...},{"data":"hex"},...] ( conf_target "estimate_mode" fee_rate options version )
   ```
   
   The last example in the manpage is missing the `fee_rate` arg, but is trying to specify the `options` arg, by index.
   The parser confuses the intended `options` arg as the missing `fee_rate` arg.
   
   See:
   ```
   $ bitcoin-cli -rpcuser=doggman -rpcpassword=donkey -rpcport=18554 -regtest send '{"bcrt1qusm48zmlzwr32csxdw4ar7atw260h22c9ten9l": 0.1}' 1 economical '{"add_to_wallet": false, "inputs": [{"txid":"0b7e1a471dc948b7a6187936b16e6d7d9833629b2f9dd8a392eb89928f63aaad", "vout":0}]}'
   error code: -8
   error message:
   Cannot specify both conf_target and fee_rate. Please provide either a confirmation target in blocks for automatic fee estimation, or an explicit fee rate.
   ```
   vs
   ```
   $ bitcoin-cli -rpcuser=doggman -rpcpassword=donkey -rpcport=18554 -regtest send '{"bcrt1qusm48zmlzwr32csxdw4ar7atw260h22c9ten9l": 0.1}' 1 economical null '{"add_to_wallet": false, "inputs": [{"txid":"0b7e1a471dc948b7a6187936b16e6d7d9833629b2f9dd8a392eb89928f63aaad", "vout":0}]}'
   {
     "psbt": "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",
     "txid": "625b71b314a6ac4f738634e29dc007cd5edc0427c1ae96ab706d06a62910cea2",
     "hex": "02000000000101adaa638f9289eb92a3d89d2f9b6233987d6d6eb1367918a6b748c91d471a7e0b0000000000fdffffff0244760f0400000000160014a4b0f026efb01511cb40080a01bd29b24ed455dd8096980000000000160014e437538b7f13871562066babd1fbab72b4fba9580247304402204953578a5b52bb0f47da8759c8a8a3056fdd05561e2cf1c1ebdf0f4bbf23c6320220426373b317cd4f48b334d21e2e79091e858bb10c566eec9939d627a3a612a79f012103454a758552c81a56a310704c33aea41e7c162de6101b3ebbe38ea84615776b1900000000",
     "complete": true
   }
   ```
   
   Github-Pull: #34561
   Rebased-From: 50cf6838e6aa51e0d712cbc1e13d686253bc8fe0

   98af76f875
5. DrahtBot added the label Backport on Feb 26, 2026
6. fanquake added this to the milestone 29.4 on Feb 26, 2026
7. 
   DrahtBot commented at 10:11 am on February 26, 2026: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Reviews

   See the guideline for information on the review process. A summary of reviews will appear here.

8. netif: fix compilation warning in QueryDefaultGatewayImpl()

   ```
   src/common/netif.cpp:137:51: error: comparison of integers of different signs: 'int64_t' (aka 'long') and 'unsigned long' [-Werror,-Wsign-compare]
     137 |         for (nlmsghdr* hdr = (nlmsghdr*)response; NLMSG_OK(hdr, recv_result); hdr = NLMSG_NEXT(hdr, recv_result)) {
         |                                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~
   /usr/include/netlink/netlink.h:220:31: note: expanded from macro 'NLMSG_OK'
     220 | #define NLMSG_OK(_hdr, _len)            NL_ITEM_OK(_hdr, _len, NLMSG_HDRLEN, _NLMSG_LEN)
         |                                         ^                ~~~~  ~~~~~~~~~~~~
   /usr/include/netlink/netlink.h:203:10: note: expanded from macro 'NL_ITEM_OK'
     203 |         ((_len) >= _hlen && _LEN_M(_ptr) >= _hlen && _LEN_M(_ptr) <= (_len))
         |           ~~~~  ^  ~~~~~
   1 error generated.
   ```
   
   Happens on FreeBSD 15.0, with the default compiler (Clang 19).
   
   On FreeBSD 14, `/usr/include/netlink/netlink.h` contains:
   ```
    #define NLMSG_HDRLEN                    ((int)sizeof(struct nlmsghdr))
   ```
   
   On FreeBSD 15, `/usr/include/netlink/netlink.h` contains:
   ```
    #define NLMSG_HDRLEN                    (sizeof(struct nlmsghdr))
   ```
   
   Co-authored-by: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>
   
   Github-Pull: #34093
   Rebased-From: c1361fc42dd60606fcd6273cede1083cd88866a2

   490cd874a4
9. doc: update release notes for v29.x 98ea6caed5
10. fanquake force-pushed on Feb 27, 2026

Contributors
fanquake DrahtBot

Labels
Backport

Milestone
29.4