Felix Fietkau kirjoitti 27.9.2021 klo 13.59:
On a crash, it should drop a .core file to /tmp. Please copy that to
your build host and use ./scripts/remote-gdb to obtain a backtrace from
it. I'd like to know, which line of code in netifd it crashes on, so I
can fix it. So far the bug has not shown up in my own tests...
- Felix
This is probably what you are looking for...
To me it looks like it might actually be a list handling bug in libubox.
perus@ub2104:/Openwrt/r7800$
./build_dir/toolchain-arm_cortex-a15+neon-vfpv4_gcc-11.2.0_musl_eabi/gdb-10.1/gdb/gdb
./staging_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/root-ipq806x/sbin/netifd
netifd.1632756907.1577.11.core
GNU gdb (GDB) 10.1
Copyright (C) 2020 Free Software Foundation, Inc.
...
Type "apropos word" to search for commands related to "word"...
Reading symbols from
./staging_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/root-ipq806x/sbin/netifd...
warning: Can't open file /sbin/netifd during file-backed mapping note processing
...
warning: Can't open file /lib/libc.so during file-backed mapping note processing
[New LWP 1577]
warning: Could not load shared library symbols for 8 libraries, e.g.
/lib/libubox.so.20210819.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?
Core was generated by `/sbin/netifd'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0xb6ea058c in ?? ()
(gdb) bt
#0 0xb6ea058c in ?? ()
#1 0x0001edc0 in device_broadcast_cb (ctx=<optimized out>, list=<optimized
out>)
at
/Openwrt/r7800/build_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/netifd-2021-09-21-08e954e1/device.c:497
#2 0xb6f2f228 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) set solib-search-path
./staging_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/
host/ packages/ pkginfo/ root-ipq806x/ stamp/ usr/
(gdb) set solib-search-path
./staging_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/usr/lib/
Reading symbols from
/Openwrt/r7800/staging_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/usr/lib/libubox.so.20210819...
Reading symbols from
/Openwrt/r7800/staging_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/usr/lib/libubus.so.20210630...
Reading symbols from
/Openwrt/r7800/staging_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/usr/lib/libuci.so...
Reading symbols from
/Openwrt/r7800/staging_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/usr/lib/libjson-c.so.5.1.0...
Reading symbols from
/Openwrt/r7800/staging_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/usr/lib/libblobmsg_json.so.20210819...
Reading symbols from
/Openwrt/r7800/staging_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/usr/lib/libnl-tiny.so...
(gdb) bt
#0 0xb6ea058c in __safe_list_del_iterator (i=0xbee1ed0c)
at
/Openwrt/r7800/build_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/libubox-2021-08-19-d716ac4b/safe_list.c:49
#1 __safe_list_move_iterator (i=0xbee1ed0c, list=0xb6f2f220)
at
/Openwrt/r7800/build_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/libubox-2021-08-19-d716ac4b/safe_list.c:58
#2 safe_list_for_each (head=head@entry=0xb6f2f220, cb=cb@entry=0x1ed94
<device_broadcast_cb>, ctx=0xbee1ed3c,
ctx@entry=0xbee1ed34)
at
/Openwrt/r7800/build_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/libubox-2021-08-19-d716ac4b/safe_list.c:73
#3 0x000210d0 in device_broadcast_event (dev=0xb6f2f200, ev=<optimized out>)
at
/Openwrt/r7800/build_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/netifd-2021-09-21-08e954e1/device.c:506
#4 0x000289a4 in handle_hotplug_msg (size=<optimized out>, data=<optimized
out>)
at
/Openwrt/r7800/build_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/netifd-2021-09-21-08e954e1/system-linux.c:777
#5 handle_hotplug_event (u=0x46ea4 <hotplug_event>, events=<optimized out>)
at
/Openwrt/r7800/build_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/netifd-2021-09-21-08e954e1/system-linux.c:793
#6 0xb6e9e9f4 in uloop_run_events (timeout=<optimized out>)
at
/Openwrt/r7800/build_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/libubox-2021-08-19-d716ac4b/uloop.c:198
#7 uloop_run_timeout (timeout=timeout@entry=-1)
at
/Openwrt/r7800/build_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/libubox-2021-08-19-d716ac4b/uloop.c:555
#8 0x00013ae8 in uloop_run ()
at
/Openwrt/r7800/staging_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/usr/include/libubox/uloop.h:111
#9 main (argc=1, argv=<optimized out>)
at
/Openwrt/r7800/build_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/netifd-2021-09-21-08e954e1/main.c:339
(gdb)
There is also a few seconds' gap in the system log, when netifd starts again:
Mon Sep 27 18:35:06 2021 kern.warn kernel: [ 178.272585] ath10k_pci
0000:01:00.0: peer-unmap-event: unknown peer id 0
Mon Sep 27 18:35:06 2021 kern.warn kernel: [ 178.272647] ath10k_pci
0000:01:00.0: peer-unmap-event: unknown peer id 0
Mon Sep 27 18:35:07 2021 daemon.notice netifd: Network device 'wlan0' link is
down
Mon Sep 27 18:35:12 2021 user.notice : Added device handler type: bonding
Mon Sep 27 18:35:12 2021 user.notice : Added device handler type: 8021ad
Mon Sep 27 18:35:12 2021 user.notice : Added device handler type: 8021q
Mon Sep 27 18:35:12 2021 user.notice : Added device handler type: macvlan
Mon Sep 27 18:35:12 2021 user.notice : Added device handler type: veth
Mon Sep 27 18:35:12 2021 user.notice : Added device handler type: bridge
Mon Sep 27 18:35:12 2021 user.notice : Added device handler type: Network device
Mon Sep 27 18:35:12 2021 user.notice : Added device handler type: tunnel
Mon Sep 27 18:35:12 2021 kern.info kernel: [ 184.243388] br-lan: port
1(eth1.1) entered disabled state
Mon Sep 27 18:35:12 2021 kern.info kernel: [ 184.250759] device eth1.1 left
promiscuous mode
Mon Sep 27 18:35:12 2021 kern.info kernel: [ 184.250779] device eth1 left
promiscuous mode
Mon Sep 27 18:35:12 2021 kern.info kernel: [ 184.254230] br-lan: port
1(eth1.1) entered disabled state
Mon Sep 27 18:35:13 2021 daemon.err odhcp6c[1865]: Failed to send RS
(Permission denied)
Mon Sep 27 18:35:13 2021 daemon.err odhcp6c[1865]: Failed to send RELEASE
message to ff02::1:2 (Permission denied)
Mon Sep 27 18:35:13 2021 kern.info kernel: [ 184.415654] ipq806x-gmac-dwmac
37200000.ethernet eth0: Link is Down
Hannu
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