Dear Ulrich，
Thanks for your suggest. I have added some debug info, but not display. I will add more.
I want ask a question, What commands does udevadm in systemd execute and what functions are corresponding to the driver?
thanks,
Byron
At 2019-10-15 20:36:41, "Ulrich Windl" <Ulrich.Windl@xxxxxxxxxxxxxxxxxxxx> wrote: >Hi! > >I think your driver loads OK, but it is not working correctly. Maybe enable >kernel debug messages and add debug prints to your driver, especially regarding >any queries. I suspect some NULL pointer or empty string being returned. > >Regards, >Ulrich > >>>> www <ouyangxuan10@xxxxxxx> schrieb am 15.10.2019 um 13:46 in Nachricht ><252176e7.9975.16dcf3de51e.Coremail.ouyangxuan10@xxxxxxx>: >> Dear all, >> >> >> I add a new driver to kernel, and it probe success. When enter into systemd, > >> the udevadm generate a kernel panic. >> I want to ask how to debug it and find out where the error occurred? When >> did udevadm load? What commands are used by udevadm, and what are the >> specific operations? >> >> >> [ 3.291819] pmbus 13-0058: PMBus status register not found >> [ 3.297940] pmbus 13-0059: PMBus status register not found >> [ 3.305830] usbcore: registered new interface driver usbhid >> [ 3.311417] usbhid: USB HID core driver >> [ 3.326527] aspeed_jtag: driver successfully loaded. --> > >> load the driver success >> [ 3.335427] NET: Registered protocol family 10 >> [ 3.345639] Segment Routing with IPv6 >> [ 3.349995] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver >> [ 3.357507] NET: Registered protocol family 17 >> [ 3.362012] 8021q: 802.1Q VLAN Support v1.8 >> [ 3.379650] printk: console [netcon0] enabled >> [ 3.384027] netconsole: network logging started >> [ 3.390140] input: gpio-keys as /devices/platform/gpio-keys/input/input0 >> [ 3.398913] hctosys: unable to open rtc device (rtc0) >> [ 3.411203] Freeing unused kernel memory: 1024K >> [ 3.419068] Checked W+X mappings: passed, no W+X pages found >> [ 3.424841] Run /init as init process >> rofs = mtd4 squashfs rwfs = mtd5 jffs2 >> [ 4.392201] jffs2: notice: (681) jffs2_build_xattr_subsystem: complete >> building xattr subsystem, 8 of xdatum (0 unchecked, 1 orphan) and 11 of xref > >> (1 dead, 0 orphan) found. >> [ 4.448757] overlayfs: upper fs does not support tmpfile. >> [ 6.760748] systemd[1]: System time before build time, advancing clock. >> [ 6.893492] systemd[1]: systemd 242-19-gdb2e367+ running in system mode. > >> (+PAM -AUDIT -SELINUX -IMA -APPARMOR -SMACK +SYSVINIT -UTMP -LIBCRYPTSETUP >> -GCRYPT -GNUTLS -ACL +XZ -LZ4 -SECCOMP +BLKID -ELFUTILS -KMOD -IDN2 -IDN >> -PCRE2 default-hierarchy=hybrid) >> [ 6.917878] systemd[1]: Detected architecture arm. >> >> >> Welcome to Phosphor OpenBMC (Phosphor OpenBMC Project Reference Distro) >> 2.7.0-dev! >> >> >> [ 7.033813] systemd[1]: Set hostname to <demoboard>. >> [ 7.769096] systemd[1]: File >> /lib/systemd/system/systemd-journald.service:12 configures an IP firewall >> (IPAddressDeny=any), but the local system does not support BPF/cgroup based > >> firewalling. >> [ 7.786341] systemd[1]: Proceeding WITHOUT firewalling in effect! (This >> warning is only shown for the first loaded unit using IP firewalling.) >> [ 8.942114] systemd[1]: /lib/systemd/system/phosphor-ipmi-net@.socket:3: > >> Invalid interface name, ignoring: sys-subsystem-net-devices-%i.device >> [ 8.982380] systemd[1]: /lib/systemd/system/dbus.socket:4: ListenStream= > >> references a path below legacy directory /var/run/, updating >> /var/run/dbus/system_bus_socket → /run/dbus/system_bus_socket; please >> update the unit file accordingly. >> [ 9.111166] systemd[1]: Reached target Fans Ready. >> [ OK ] Reached target Fans Ready. >> [ 9.148717] systemd[1]: Created slice >> system-phosphor\x2dipmi\x2dkcs.slice. >> [ OK ] Created slice system-phosphor\x2dipmi\x2dkcs.slice. >> [ 9.199247] systemd[1]: Listening on udev Kernel Socket. >> [ OK ] Listening on udev Kernel Socket. >> [ OK ] Reached target Slices. >> [ OK ] Created slice system-phosphor\x2dipmi\x2dnet.slice. >> [ OK ] Reached target Remote File Systems. >> [ OK ] Created slice system-mapper\x2dwait.slice. >> [ OK ] Started Forward Password Râ€|uests to Wall Directory Watch. >> [ OK ] Created slice system-phosphor\x2dgpio\x2dmonitor.slice. >> [ OK ] Listening on Journal Socket. >> Mounting Kernel Configuration File System... >> [ OK ] Started Dispatch Password â€|ts to Console Directory Watch. >> [ OK ] Reached target Paths. >> [ OK ] Created slice system-phospâ€|dcertificate\x2dmanager.slice. >> [ OK ] Listening on initctl Compatibility Named Pipe. >> Mounting Kernel Debug File System... >> [ OK ] Created slice system-obmc\x2dled\x2dgroup\x2dstart.slice. >> [ OK ] Reached target Swap. >> Mounting Temporary Directory (/tmp)... >> [ OK ] Listening on Network Service Netlink Socket. >> [ OK ] Started Hardware RNG Entropy Gatherer Daemon. >> [ OK ] Created slice system-getty.slice. >> [ OK ] Listening on udev Control Socket. >> Starting udev Coldplug all Devices... >> [ OK ] Listening on Syslog Socket. >> [ OK ] Created slice system-obmc\x2dconsole.slice. >> [ OK ] Created slice system-serial\x2dgetty.slice. >> [ OK ] Created slice system-obmc\x2dread\x2deeprom.slice. >> Starting Apply Kernel Variables... >> Starting Remount Root and Kernel File Systems... >> [ OK ] Started Set initial fan speed when BMC starts.. >> [ OK ] Listening on Journal Socket (/dev/log). >> Starting Journal Service... >> [ OK ] Mounted Kernel Configuration File System. >> [ OK ] Mounted Kernel Debug File System. >> [ OK ] Mounted Temporary Directory (/tmp). >> [ OK ] Started Remount Root and Kernel File Systems. >> Starting Rebuild Hardware Database... >> Starting Create System Users... >> [ OK ] Started Apply Kernel Variables. >> [ OK ] Started Rebuild Hardware Database. >> [ OK ] Started Create System Users. >> [ OK ] Started Journal Service. >> Starting Flush Journal to Persistent Storage... >> Starting Create Static Device Nodes in /dev... >> [ OK ] Started Create Static Device Nodes in /dev. >> [ 12.129145] systemd-journald[710]: Received request to flush runtime >> journal from PID 1 >> Starting udev Kernel Device Manager... >> [ OK ] Reached target Local File Systems (Pre). >> Mounting /var/volatile... >> [ OK ] Started Flush Journal to Persistent Storage. >> [ OK ] Mounted /var/volatile. >> Starting Load/Save Random Seed... >> [ OK ] Reached target Local File Systems. >> Starting Create Volatile Files and Directories... >> [ OK ] Started Load/Save Random Seed. >> [ 13.497500] Unable to handle kernel paging request at virtual address >> 0179a7b0 >> [ 13.504866] pgd = 6cf98158 >> [ 13.507598] [0179a7b0] *pgd=00000000 >> [ 13.511199] Internal error: Oops: 5 [#1] ARM >> [ 13.515489] CPU: 0 PID: 846 Comm: udevadm Not tainted >> 5.1.5-yocto-s-dirty-e03b6d3 #1 --> udevadm lead to kernel >> panic >> [ 13.523227] Hardware name: Generic DT based system >> [ 13.528031] PC is at strlen+0xc/0x38 >> [ 13.531624] LR is at kstrdup+0x28/0x60 >> [ 13.535369] pc : [<806f08ac>] lr : [<8020dc7c>] psr: 20000013 >> [ 13.541625] sp : 999edcf0 ip : 999edd00 fp : 999edcfc >> [ 13.546842] r10: 00001000 r9 : 9e753d80 r8 : 80a07008 >> [ 13.552061] r7 : 999edd5e r6 : 0179a7b0 r5 : 804004f4 r4 : 00000cc0 >> [ 13.558579] r3 : 9ac737c0 r2 : 00000000 r1 : 00000cc0 r0 : 0179a7b0 >> [ 13.565097] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment > >> none >> [ 13.572220] Control: 00c5387d Table: 999f8008 DAC: 00000051 >> [ 13.577964] Process udevadm (pid: 846, stack limit = 0x1ca521ae) >> [ 13.583965] Stack: (0x999edcf0 to 0x999ee000) >> [ 13.588320] dce0: 999edd1c 999edd00 >> 8020dc7c 806f08ac >> [ 13.596495] dd00: 9ac47608 9ac47600 999edd60 999edd5e 999edd2c 999edd20 >> 804004f4 8020dc60 >> [ 13.604668] dd20: 999edd4c 999edd30 804475c0 804004c0 9ac47608 9adb5000 >> 9ac47600 9ac47608 >> [ 13.612839] dd40: 999edd94 999edd50 804477bc 8044754c 999edd60 999edd60 >> 00000894 0000ff1c >> [ 13.621013] dd60: 00000000 00000000 00000000 b7accb6a 9ac47608 9e487940 >> 9ac47608 9adb5000 >> [ 13.629186] dd80: 9ac47608 99965000 999eddbc 999edd98 80445d54 80447630 >> 9accee10 80a38ba4 >> [ 13.637356] dda0: 99965000 9ac47608 00000fff 9e753d80 999eddd4 999eddc0 >> 80445ba4 80445cb8 >> [ 13.645531] ddc0: 9accee10 8073f7e4 999ede04 999eddd8 802acd08 80445b84 >> 802acc78 9accee10 >> [ 13.653702] dde0: 9990ba40 00400cc0 00000000 999edf60 9accee28 00000001 >> 999ede14 999ede08 >> [ 13.661876] de00: 802ab5f4 802acc84 999ede5c 999ede18 8025efb0 802ab5cc >> 9e6fc000 999edf60 >> [ 13.670048] de20: 9990ba40 9accee40 01b071f8 00001000 7eb787f8 9e753d80 >> 00001000 802ac0a0 >> [ 13.678221] de40: 999edf60 999edf60 999edf60 00000000 999ede9c 999ede60 >> 802ac0e0 8025ee60 >> [ 13.686393] de60: 999edefc 999ede70 8023f368 01b071f8 0000000d 9990ba40 >> 80a07008 802ac0a0 >> [ 13.694566] de80: 999edf60 00001000 999edf60 00000000 999edf24 999edea0 >> 80239348 802ac0ac >> [ 13.702737] dea0: 00001000 00000000 00001000 00000000 00000000 00000000 >> 5da3e857 2b82ea81 >> [ 13.710911] dec0: 5da3e857 2b82ea81 5da3e857 2b82ea81 00001d14 00000000 >> 80a07008 b7accb6a >> [ 13.719084] dee0: 01b071f8 80a07008 7eb787f8 802394fc 999edfa4 b7accb6a >> 8023fc40 00001000 >> [ 13.727255] df00: 9990ba40 01b071f8 999edf60 00000001 00000000 00000000 >> 999edf54 999edf28 >> [ 13.735429] df20: 80239520 80239310 0000000d 8025930c 9990ba40 9990ba40 >> 80a07008 01b071f8 >> [ 13.743600] df40: 00000000 00000000 999edf94 999edf58 8023994c 80239498 >> 00000000 00000000 >> [ 13.751775] df60: 00000000 00000000 2b82ea81 b7accb6a 01ad4150 01b071f8 >> 457f1654 00000003 >> [ 13.759947] df80: 801011e4 999ec000 999edfa4 999edf98 802399dc 802398e8 >> 00000000 999edfa8 >> [ 13.768118] dfa0: 80101000 802399d0 01ad4150 01b071f8 00000005 01b071f8 >> 00001000 00000000 >> [ 13.776292] dfc0: 01ad4150 01b071f8 457f1654 00000003 00001001 457f11bc >> 00001001 000005e8 >> [ 13.784463] dfe0: 00000070 7eb78868 4571bad4 45774f28 60000010 00000005 >> 00000000 00000000 >> [ 13.792626] Backtrace: >> [ 13.795094] [<806f08a0>] (strlen) from [<8020dc7c>] (kstrdup+0x28/0x60) >> [ 13.801731] [<8020dc54>] (kstrdup) from [<804004f4>] >(misc_devnode+0x40/0x44) >> [ 13.808869] r7:999edd5e r6:999edd60 r5:9ac47600 r4:9ac47608 >> [ 13.814546] [<804004b4>] (misc_devnode) from [<804475c0>] >> (device_get_devnode+0x80/0xe4) >> [ 13.822639] [<80447540>] (device_get_devnode) from [<804477bc>] >> (dev_uevent+0x198/0x2cc) >> [ 13.830724] r7:9ac47608 r6:9ac47600 r5:9adb5000 r4:9ac47608 >> [ 13.836390] [<80447624>] (dev_uevent) from [<80445d54>] >> (uevent_show+0xa8/0x124) >> [ 13.843788] r8:99965000 r7:9ac47608 r6:9adb5000 r5:9ac47608 r4:9e487940 >> [ 13.850491] [<80445cac>] (uevent_show) from [<80445ba4>] >> (dev_attr_show+0x2c/0x58) >> [ 13.858064] r9:9e753d80 r8:00000fff r7:9ac47608 r6:99965000 r5:80a38ba4 > >> r4:9accee10 >> [ 13.865825] [<80445b78>] (dev_attr_show) from [<802acd08>] >> (sysfs_kf_seq_show+0x90/0x108) >> [ 13.873994] r5:8073f7e4 r4:9accee10 >> [ 13.877581] [<802acc78>] (sysfs_kf_seq_show) from [<802ab5f4>] >> (kernfs_seq_show+0x34/0x38) >> [ 13.885839] r10:00000001 r9:9accee28 r8:999edf60 r7:00000000 r6:00400cc0 > >> r5:9990ba40 >> [ 13.893658] r4:9accee10 r3:802acc78 >> [ 13.897250] [<802ab5c0>] (kernfs_seq_show) from [<8025efb0>] >> (seq_read+0x15c/0x4ec) >> [ 13.904913] [<8025ee54>] (seq_read) from [<802ac0e0>] >> (kernfs_fop_read+0x40/0x1c4) >> [ 13.912481] r10:00000000 r9:999edf60 r8:999edf60 r7:999edf60 r6:802ac0a0 > >> r5:00001000 >> [ 13.920296] r4:9e753d80 >> [ 13.922850] [<802ac0a0>] (kernfs_fop_read) from [<80239348>] >> (__vfs_read+0x44/0x188) >> [ 13.930595] r10:00000000 r9:999edf60 r8:00001000 r7:999edf60 r6:802ac0a0 > >> r5:80a07008 >> [ 13.938411] r4:9990ba40 >> [ 13.940952] [<80239304>] (__vfs_read) from [<80239520>] >(vfs_read+0x94/0x120) >> [ 13.948082] r10:00000000 r9:00000000 r8:00000001 r7:999edf60 r6:01b071f8 > >> r5:9990ba40 >> [ 13.955900] r4:00001000 >> [ 13.958442] [<8023948c>] (vfs_read) from [<8023994c>] >(ksys_read+0x70/0xe8) >> [ 13.965399] r9:00000000 r8:00000000 r7:01b071f8 r6:80a07008 r5:9990ba40 > >> r4:9990ba40 >> [ 13.973141] [<802398dc>] (ksys_read) from [<802399dc>] >(sys_read+0x18/0x1c) >> [ 13.980099] r9:999ec000 r8:801011e4 r7:00000003 r6:457f1654 r5:01b071f8 > >> r4:01ad4150 >> [ 13.987841] [<802399c4>] (sys_read) from [<80101000>] >> (ret_fast_syscall+0x0/0x54) >> [ 13.995319] Exception stack(0x999edfa8 to 0x999edff0) >> [ 14.000368] dfa0: 01ad4150 01b071f8 00000005 01b071f8 >> 00001000 00000000 >> [ 14.008542] dfc0: 01ad4150 01b071f8 457f1654 00000003 00001001 457f11bc >> 00001001 000005e8 >> [ 14.016710] dfe0: 00000070 7eb78868 4571bad4 45774f28 >> [ 14.021762] Code: e89da800 e1a0c00d e92dd800 e24cb004 (e5d03000) >> [ 14.028037] ---[ end trace 850b9c31df4945cf ]--- >> [ 14.032675] Kernel panic - not syncing: Fatal exception >> [ 14.037912] ---[ end Kernel panic - not syncing: Fatal exception ]--- >> >> >> >> >> thanks， >> Byron > >
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