tachang
commented
3 years ago This almost sounds like bad ram. Kernel isn't able to handle a paging request? Code: bad PC value means something is weird in the registers? Sounds odd. Can you run any memory tests against a rasp pi? Or even the sdcard if it has one.
mpromonet
Hello :)
Apologies if this isn't your issue, but as I only really run v4l2rtspserver, I assumed it was related. I'm also very new to this...
I've recently updated v4l2rtspserver and the OS (I use a lite version to help with available resources) of my Raspberry Pi W. I've had it running for a day or so and found the stream had stopped. Upon doing dmesg:
[179114.279715] 8<--- cut here --- [179114.281298] Unable to handle kernel paging request at virtual address bf95aed0 [179114.282878] pgd = f43dc0ef [179114.284445] [bf95aed0] *pgd=00000000 [179114.286097] Internal error: Oops: 80000005 [#1] ARM [179114.288719] Modules linked in: aes_arm aes_generic cmac bnep hci_uart btbcm bluetooth ecdh_generic ecc libaes 8021q garp stp llc brcmfmac brcmutil sha256_generic libsha256 raspberrypi_hwmon cfg80211 rfkill bcm2835_codec(C) v4l2_mem2mem bcm2835_v4l2(C) bcm2835_isp(C) bcm2835_mmal_vchiq(C) videobuf2_dma_contig videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common snd_bcm2835(C) snd_pcm snd_timer videodev snd mc vc_sm_cma(C) uio_pdrv_genirq fixed uio ip_tables x_tables ipv6 [179114.300802] CPU: 0 PID: 705 Comm: v4l2rtspserver Tainted: G C 5.4.72+ #1354 [179114.307660] Hardware name: BCM2835 [179114.310202] PC is at 0xbf95aed0 [179114.313026] LR is at video_usercopy+0x498/0x5e0 [videodev] [179114.315942] pc : [] lr : [] psr: 60000013
[179114.318872] sp : cfef9df0 ip : cfef9df0 fp : cfef9ebc
[179114.321826] r10: cfef9e0c r9 : 00000000 r8 : 00000003
[179114.324657] r7 : 00000000 r6 : 00000044 r5 : 00000000 r4 : c0445611
[179114.327570] r3 : 00000000 r2 : bf1406a0 r1 : 00000000 r0 : d142c058
[179114.330399] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[179114.333107] Control: 00c5387d Table: 0c644008 DAC: 00000055
[179114.335381] Process v4l2rtspserver (pid: 705, stack limit = 0xcdc60f5f)
[179114.337643] Stack: (0xcfef9df0 to 0xcfefa000)
[179114.339899] 9de0: 00000000 00000000 cc5446e0 b57acc28
[179114.344517] 9e00: 00000000 00000000 c0b432c8 00000005 00000001 00012db3 00002001 00000001
[179114.349085] 9e20: 0002bbaa 0002c66f 00000000 00000000 00000000 00000000 00284673 00000001
[179114.353701] 9e40: 009f6000 001fe000 00000000 00000000 c0186288 c018e2cc 00000000 c01c47e4
[179114.359391] 9e60: 00000000 cfef9ea8 cfef9e9c cfef9e78 c01c47e4 00000000 d0936360 c018e5b8
[179114.363991] 9e80: 00000000 d0936360 0e17f34f c0aa7028 cfef9f0c bf11f00c d17e90c0 cc5446e0
[179114.368810] 9ea0: 00000004 cc5446e0 00000004 00000000 cfef9ecc cfef9ec0 bf11f028 bf11ea38
[179114.376312] 9ec0: cfef9ee4 cfef9ed0 bf117148 bf11f018 b57acc28 d17e90c0 cfef9f6c cfef9ee8
[179114.382517] 9ee0: c01e3828 bf117108 cfef9fb0 b4c01000 00000805 d245d580 cd4c2700 c07b31fc
[179114.389575] 9f00: cfef9f5c cfef9f10 c07b31fc c0063238 00000000 cfef9f20 cfef9f24 b57acd48
[179114.396748] 9f20: 00000000 c01ee5ac 00067100 01e9e9f8 c0445611 b57acc28 c00091a4 c0aa7028
[179114.402986] 9f40: cfef9f5c cc5446e1 00000000 c0445611 b57acc28 cc5446e0 00000004 00000000
[179114.408897] 9f60: cfef9f94 cfef9f70 c01e3cb8 c01e34b0 00067100 01e9e9f8 b6fa5950 00000036
[179114.414841] 9f80: c00091a4 cfef8000 cfef9fa4 cfef9f98 c01e3cf4 c01e3c58 00000000 cfef9fa8
[179114.421064] 9fa0: c0009000 c01e3ce8 00067100 01e9e9f8 00000004 c0445611 b57acc28 00000004
[179114.427897] 9fc0: 00067100 01e9e9f8 b6fa5950 00000036 beea2692 b57ad450 00000000 b57acc84
[179114.433415] 9fe0: 00111144 b57acc14 0006a56c b6c8d51c 40000010 00000004 00000000 00000000
[179114.441699] Backtrace:
[179114.445332] [] (video_usercopy [videodev]) from [] (video_ioctl2+0x1c/0x24 [videodev])
[179114.452418] r10:00000000 r9:00000004 r8:cc5446e0 r7:00000004 r6:cc5446e0 r5:d17e90c0
[179114.459579] r4:bf11f00c
[179114.463469] [] (video_ioctl2 [videodev]) from [] (v4l2_ioctl+0x4c/0x64 [videodev])
[179114.469664] [] (v4l2_ioctl [videodev]) from [] (do_vfs_ioctl+0x384/0x7a8)
[179114.475283] r5:d17e90c0 r4:b57acc28
[179114.478012] [] (do_vfs_ioctl) from [] (ksys_ioctl+0x6c/0x90)
[179114.483344] r10:00000000 r9:00000004 r8:cc5446e0 r7:b57acc28 r6:c0445611 r5:00000000
[179114.489852] r4:cc5446e1
[179114.492740] [] (ksys_ioctl) from [] (sys_ioctl+0x18/0x1c)
[179114.495357] r9:cfef8000 r8:c00091a4 r7:00000036 r6:b6fa5950 r5:01e9e9f8 r4:00067100
[179114.500074] [] (sys_ioctl) from [] (ret_fast_syscall+0x0/0x28)
[179114.507562] Exception stack(0xcfef9fa8 to 0xcfef9ff0)
[179114.510499] 9fa0: 00067100 01e9e9f8 00000004 c0445611 b57acc28 00000004
[179114.516641] 9fc0: 00067100 01e9e9f8 b6fa5950 00000036 beea2692 b57ad450 00000000 b57acc84
[179114.523331] 9fe0: 00111144 b57acc14 0006a56c b6c8d51c
[179114.526836] Code: bad PC value
[179114.530128] ---[ end trace 7c7c6e9419b1f585 ]---
Doing top, it shows:
top - 18:27:40 up 2 days, 21:31, 1 user, load average: 0.10, 0.11, 0.09 Tasks: 77 total, 1 running, 76 sleeping, 0 stopped, 0 zombie %Cpu(s): 1.7 us, 1.0 sy, 0.0 ni, 97.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st MiB Mem : 368.4 total, 146.9 free, 51.8 used, 169.6 buff/cache MiB Swap: 100.0 total, 100.0 free, 0.0 used. 249.0 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 704 root 20 0 41284 24376 24112 S 1.3 6.5 715:51.33 v4l2rtsps+
uname -a shows:
Linux raspberrypi 5.4.72+ #1354 Mon Oct 19 13:34:33 BST 2020 armv6l GNU/Linux
Upon trying to restart it (I have it set up as a service), in dmesg, I see:
[250376.967440] bcm2835-v4l2: vidioc_s_fmt_vid_cap device busy [250376.979209] bcm2835-v4l2: vidioc_s_fmt_vid_cap device busy [250376.981950] bcm2835-v4l2: vidioc_s_fmt_vid_cap device busy [250382.260065] bcm2835-v4l2: vidioc_s_fmt_vid_cap device busy [250382.262658] bcm2835-v4l2: vidioc_s_fmt_vid_cap device busy [250382.265005] bcm2835-v4l2: vidioc_s_fmt_vid_cap device busy [250387.558809] bcm2835-v4l2: vidioc_s_fmt_vid_cap device busy [250387.561172] bcm2835-v4l2: vidioc_s_fmt_vid_cap device busy [250387.574901] bcm2835-v4l2: vidioc_s_fmt_vid_cap device busy [250392.804938] bcm2835-v4l2: vidioc_s_fmt_vid_cap device busy [250392.807084] bcm2835-v4l2: vidioc_s_fmt_vid_cap device busy [250392.814566] bcm2835-v4l2: vidioc_s_fmt_vid_cap device busy
At this point, I just rebooted and it started working again without any issues.
I hope this is of some value to you.
Many thanks