<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><div>Dear all,</div><div><br></div><div>I add a new driver to kernel, and it probe success. When enter into systemd, the udevadm generate a kernel panic.</div><div>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?</div><div><br></div><div><div><span style="font-size: 10px;">[ 3.291819] pmbus 13-0058: PMBus status register not found</span></div><div><span style="font-size: 10px;">[ 3.297940] pmbus 13-0059: PMBus status register not found</span></div><div><span style="font-size: 10px;">[ 3.305830] usbcore: registered new interface driver usbhid</span></div><div><span style="font-size: 10px;">[ 3.311417] usbhid: USB HID core driver</span></div><div><span style="font-size: 10px; background-color: rgb(255, 204, 0);"><b>[ 3.326527] aspeed_jtag: driver successfully loaded. </b></span><span style="font-size: 10px;"><b> --> load the driver success</b></span></div><div><span style="font-size: 10px;">[ 3.335427] NET: Registered protocol family 10</span></div><div><span style="font-size: 10px;">[ 3.345639] Segment Routing with IPv6</span></div><div><span style="font-size: 10px;">[ 3.349995] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver</span></div><div><span style="font-size: 10px;">[ 3.357507] NET: Registered protocol family 17</span></div><div><span style="font-size: 10px;">[ 3.362012] 8021q: 802.1Q VLAN Support v1.8</span></div><div><span style="font-size: 10px;">[ 3.379650] printk: console [netcon0] enabled</span></div><div><span style="font-size: 10px;">[ 3.384027] netconsole: network logging started</span></div><div><span style="font-size: 10px;">[ 3.390140] input: gpio-keys as /devices/platform/gpio-keys/input/input0</span></div><div><span style="font-size: 10px;">[ 3.398913] hctosys: unable to open rtc device (rtc0)</span></div><div><span style="font-size: 10px;">[ 3.411203] Freeing unused kernel memory: 1024K</span></div><div><span style="font-size: 10px;">[ 3.419068] Checked W+X mappings: passed, no W+X pages found</span></div><div><span style="font-size: 10px;">[ 3.424841] Run /init as init process</span></div><div><span style="font-size: 10px;">rofs = mtd4 squashfs rwfs = mtd5 jffs2</span></div><div><span style="font-size: 10px;">[ 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.</span></div><div><span style="font-size: 10px;">[ 4.448757] overlayfs: upper fs does not support tmpfile.</span></div><div><span style="font-size: 10px;">[ 6.760748] systemd[1]: System time before build time, advancing clock.</span></div><div><span style="font-size: 10px;">[ 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)</span></div><div><span style="font-size: 10px;">[ 6.917878] systemd[1]: Detected architecture arm.</span></div><div><br></div><div><span style="font-size: 10px;">Welcome to Phosphor OpenBMC (Phosphor OpenBMC Project Reference Distro) 2.7.0-dev!</span></div><div><br></div><div><span style="font-size: 10px;">[ 7.033813] systemd[1]: Set hostname to <demoboard>.</span></div><div><span style="font-size: 10px;">[ 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.</span></div><div><span style="font-size: 10px;">[ 7.786341] systemd[1]: Proceeding WITHOUT firewalling in effect! (This warning is only shown for the first loaded unit using IP firewalling.)</span></div><div><span style="font-size: 10px;">[ 8.942114] systemd[1]: /lib/systemd/system/phosphor-ipmi-net@.socket:3: Invalid interface name, ignoring: sys-subsystem-net-devices-%i.device</span></div><div><span style="font-size: 10px;">[ 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 â†’ /run/dbus/system_bus_socket; please update the unit file accordingly.</span></div><div><span style="font-size: 10px;">[ 9.111166] systemd[1]: Reached target Fans Ready.</span></div><div><span style="font-size: 10px;">[ OK ] Reached target Fans Ready.</span></div><div><span style="font-size: 10px;">[ 9.148717] systemd[1]: Created slice system-phosphor\x2dipmi\x2dkcs.slice.</span></div><div><span style="font-size: 10px;">[ OK ] Created slice system-phosphor\x2dipmi\x2dkcs.slice.</span></div><div><span style="font-size: 10px;">[ 9.199247] systemd[1]: Listening on udev Kernel Socket.</span></div><div><span style="font-size: 10px;">[ OK ] Listening on udev Kernel Socket.</span></div><div><span style="font-size: 10px;">[ OK ] Reached target Slices.</span></div><div><span style="font-size: 10px;">[ OK ] Created slice system-phosphor\x2dipmi\x2dnet.slice.</span></div><div><span style="font-size: 10px;">[ OK ] Reached target Remote File Systems.</span></div><div><span style="font-size: 10px;">[ OK ] Created slice system-mapper\x2dwait.slice.</span></div><div><span style="font-size: 10px;">[ OK ] Started Forward Password Râ€¦uests to Wall Directory Watch.</span></div><div><span style="font-size: 10px;">[ OK ] Created slice system-phosphor\x2dgpio\x2dmonitor.slice.</span></div><div><span style="font-size: 10px;">[ OK ] Listening on Journal Socket.</span></div><div><span style="font-size: 10px;"> Mounting Kernel Configuration File System...</span></div><div><span style="font-size: 10px;">[ OK ] Started Dispatch Password â€¦ts to Console Directory Watch.</span></div><div><span style="font-size: 10px;">[ OK ] Reached target Paths.</span></div><div><span style="font-size: 10px;">[ OK ] Created slice system-phospâ€¦dcertificate\x2dmanager.slice.</span></div><div><span style="font-size: 10px;">[ OK ] Listening on initctl Compatibility Named Pipe.</span></div><div><span style="font-size: 10px;"> Mounting Kernel Debug File System...</span></div><div><span style="font-size: 10px;">[ OK ] Created slice system-obmc\x2dled\x2dgroup\x2dstart.slice.</span></div><div><span style="font-size: 10px;">[ OK ] Reached target Swap.</span></div><div><span style="font-size: 10px;"> Mounting Temporary Directory (/tmp)...</span></div><div><span style="font-size: 10px;">[ OK ] Listening on Network Service Netlink Socket.</span></div><div><span style="font-size: 10px;">[ OK ] Started Hardware RNG Entropy Gatherer Daemon.</span></div><div><span style="font-size: 10px;">[ OK ] Created slice system-getty.slice.</span></div><div><span style="font-size: 10px;">[ OK ] Listening on udev Control Socket.</span></div><div><span style="font-size: 10px;"> Starting udev Coldplug all Devices...</span></div><div><span style="font-size: 10px;">[ OK ] Listening on Syslog Socket.</span></div><div><span style="font-size: 10px;">[ OK ] Created slice system-obmc\x2dconsole.slice.</span></div><div><span style="font-size: 10px;">[ OK ] Created slice system-serial\x2dgetty.slice.</span></div><div><span style="font-size: 10px;">[ OK ] Created slice system-obmc\x2dread\x2deeprom.slice.</span></div><div><span style="font-size: 10px;"> Starting Apply Kernel Variables...</span></div><div><span style="font-size: 10px;"> Starting Remount Root and Kernel File Systems...</span></div><div><span style="font-size: 10px;">[ OK ] Started Set initial fan speed when BMC starts..</span></div><div><span style="font-size: 10px;">[ OK ] Listening on Journal Socket (/dev/log).</span></div><div><span style="font-size: 10px;"> Starting Journal Service...</span></div><div><span style="font-size: 10px;">[ OK ] Mounted Kernel Configuration File System.</span></div><div><span style="font-size: 10px;">[ OK ] Mounted Kernel Debug File System.</span></div><div><span style="font-size: 10px;">[ OK ] Mounted Temporary Directory (/tmp).</span></div><div><span style="font-size: 10px;">[ OK ] Started Remount Root and Kernel File Systems.</span></div><div><span style="font-size: 10px;"> Starting Rebuild Hardware Database...</span></div><div><span style="font-size: 10px;"> Starting Create System Users...</span></div><div><span style="font-size: 10px;">[ OK ] Started Apply Kernel Variables.</span></div><div><span style="font-size: 10px;">[ OK ] Started Rebuild Hardware Database.</span></div><div><span style="font-size: 10px;">[ OK ] Started Create System Users.</span></div><div><span style="font-size: 10px;">[ OK ] Started Journal Service.</span></div><div><span style="font-size: 10px;"> Starting Flush Journal to Persistent Storage...</span></div><div><span style="font-size: 10px;"> Starting Create Static Device Nodes in /dev...</span></div><div><span style="font-size: 10px;">[ OK ] Started Create Static Device Nodes in /dev.</span></div><div><span style="font-size: 10px;">[ 12.129145] systemd-journald[710]: Received request to flush runtime journal from PID 1</span></div><div><span style="font-size: 10px;"> Starting udev Kernel Device Manager...</span></div><div><span style="font-size: 10px;">[ OK ] Reached target Local File Systems (Pre).</span></div><div><span style="font-size: 10px;"> Mounting /var/volatile...</span></div><div><span style="font-size: 10px;">[ OK ] Started Flush Journal to Persistent Storage.</span></div><div><span style="font-size: 10px;">[ OK ] Mounted /var/volatile.</span></div><div><span style="font-size: 10px;"> Starting Load/Save Random Seed...</span></div><div><span style="font-size: 10px;">[ OK ] Reached target Local File Systems.</span></div><div><span style="font-size: 10px;"> Starting Create Volatile Files and Directories...</span></div><div><span style="font-size: 10px;">[ OK ] Started Load/Save Random Seed.</span></div><div><span style="font-size: 10px;">[ 13.497500] Unable to handle kernel paging request at virtual address 0179a7b0</span></div><div><span style="font-size: 10px;">[ 13.504866] pgd = 6cf98158</span></div><div><span style="font-size: 10px;">[ 13.507598] [0179a7b0] *pgd=00000000</span></div><div><span style="font-size: 10px;">[ 13.511199] Internal error: Oops: 5 [#1] ARM</span></div><div><span style="font-size: 10px;">[ 13.515489] CPU: 0 PID: 846 Comm: </span><span style="font-size: 10px; background-color: rgb(255, 204, 0);"><b>udevadm Not tainted 5.1.5-yocto-s-dirty-e03b6d3 #1 </b></span><span style="font-size: 10px;"><b> --> udevadm lead to kernel panic</b></span></div><div><span style="font-size: 10px;">[ 13.523227] Hardware name: Generic DT based system</span></div><div><span style="font-size: 10px;">[ 13.528031] PC is at strlen+0xc/0x38</span></div><div><span style="font-size: 10px;">[ 13.531624] LR is at kstrdup+0x28/0x60</span></div><div><span style="font-size: 10px;">[ 13.535369] pc : [<806f08ac>] lr : [<8020dc7c>] psr: 20000013</span></div><div><span style="font-size: 10px;">[ 13.541625] sp : 999edcf0 ip : 999edd00 fp : 999edcfc</span></div><div><span style="font-size: 10px;">[ 13.546842] r10: 00001000 r9 : 9e753d80 r8 : 80a07008</span></div><div><span style="font-size: 10px;">[ 13.552061] r7 : 999edd5e r6 : 0179a7b0 r5 : 804004f4 r4 : 00000cc0</span></div><div><span style="font-size: 10px;">[ 13.558579] r3 : 9ac737c0 r2 : 00000000 r1 : 00000cc0 r0 : 0179a7b0</span></div><div><span style="font-size: 10px;">[ 13.565097] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none</span></div><div><span style="font-size: 10px;">[ 13.572220] Control: 00c5387d Table: 999f8008 DAC: 00000051</span></div><div><span style="font-size: 10px;">[ 13.577964] Process udevadm (pid: 846, stack limit = 0x1ca521ae)</span></div><div><span style="font-size: 10px;">[ 13.583965] Stack: (0x999edcf0 to 0x999ee000)</span></div><div><span style="font-size: 10px;">[ 13.588320] dce0: 999edd1c 999edd00 8020dc7c 806f08ac</span></div><div><span style="font-size: 10px;">[ 13.596495] dd00: 9ac47608 9ac47600 999edd60 999edd5e 999edd2c 999edd20 804004f4 8020dc60</span></div><div><span style="font-size: 10px;">[ 13.604668] dd20: 999edd4c 999edd30 804475c0 804004c0 9ac47608 9adb5000 9ac47600 9ac47608</span></div><div><span style="font-size: 10px;">[ 13.612839] dd40: 999edd94 999edd50 804477bc 8044754c 999edd60 999edd60 00000894 0000ff1c</span></div><div><span style="font-size: 10px;">[ 13.621013] dd60: 00000000 00000000 00000000 b7accb6a 9ac47608 9e487940 9ac47608 9adb5000</span></div><div><span style="font-size: 10px;">[ 13.629186] dd80: 9ac47608 99965000 999eddbc 999edd98 80445d54 80447630 9accee10 80a38ba4</span></div><div><span style="font-size: 10px;">[ 13.637356] dda0: 99965000 9ac47608 00000fff 9e753d80 999eddd4 999eddc0 80445ba4 80445cb8</span></div><div><span style="font-size: 10px;">[ 13.645531] ddc0: 9accee10 8073f7e4 999ede04 999eddd8 802acd08 80445b84 802acc78 9accee10</span></div><div><span style="font-size: 10px;">[ 13.653702] dde0: 9990ba40 00400cc0 00000000 999edf60 9accee28 00000001 999ede14 999ede08</span></div><div><span style="font-size: 10px;">[ 13.661876] de00: 802ab5f4 802acc84 999ede5c 999ede18 8025efb0 802ab5cc 9e6fc000 999edf60</span></div><div><span style="font-size: 10px;">[ 13.670048] de20: 9990ba40 9accee40 01b071f8 00001000 7eb787f8 9e753d80 00001000 802ac0a0</span></div><div><span style="font-size: 10px;">[ 13.678221] de40: 999edf60 999edf60 999edf60 00000000 999ede9c 999ede60 802ac0e0 8025ee60</span></div><div><span style="font-size: 10px;">[ 13.686393] de60: 999edefc 999ede70 8023f368 01b071f8 0000000d 9990ba40 80a07008 802ac0a0</span></div><div><span style="font-size: 10px;">[ 13.694566] de80: 999edf60 00001000 999edf60 00000000 999edf24 999edea0 80239348 802ac0ac</span></div><div><span style="font-size: 10px;">[ 13.702737] dea0: 00001000 00000000 00001000 00000000 00000000 00000000 5da3e857 2b82ea81</span></div><div><span style="font-size: 10px;">[ 13.710911] dec0: 5da3e857 2b82ea81 5da3e857 2b82ea81 00001d14 00000000 80a07008 b7accb6a</span></div><div><span style="font-size: 10px;">[ 13.719084] dee0: 01b071f8 80a07008 7eb787f8 802394fc 999edfa4 b7accb6a 8023fc40 00001000</span></div><div><span style="font-size: 10px;">[ 13.727255] df00: 9990ba40 01b071f8 999edf60 00000001 00000000 00000000 999edf54 999edf28</span></div><div><span style="font-size: 10px;">[ 13.735429] df20: 80239520 80239310 0000000d 8025930c 9990ba40 9990ba40 80a07008 01b071f8</span></div><div><span style="font-size: 10px;">[ 13.743600] df40: 00000000 00000000 999edf94 999edf58 8023994c 80239498 00000000 00000000</span></div><div><span style="font-size: 10px;">[ 13.751775] df60: 00000000 00000000 2b82ea81 b7accb6a 01ad4150 01b071f8 457f1654 00000003</span></div><div><span style="font-size: 10px;">[ 13.759947] df80: 801011e4 999ec000 999edfa4 999edf98 802399dc 802398e8 00000000 999edfa8</span></div><div><span style="font-size: 10px;">[ 13.768118] dfa0: 80101000 802399d0 01ad4150 01b071f8 00000005 01b071f8 00001000 00000000</span></div><div><span style="font-size: 10px;">[ 13.776292] dfc0: 01ad4150 01b071f8 457f1654 00000003 00001001 457f11bc 00001001 000005e8</span></div><div><span style="font-size: 10px;">[ 13.784463] dfe0: 00000070 7eb78868 4571bad4 45774f28 60000010 00000005 00000000 00000000</span></div><div><span style="font-size: 10px;">[ 13.792626] Backtrace:</span></div><div><span style="font-size: 10px;">[ 13.795094] [<806f08a0>] (strlen) from [<8020dc7c>] (kstrdup+0x28/0x60)</span></div><div><span style="font-size: 10px;">[ 13.801731] [<8020dc54>] (kstrdup) from [<804004f4>] (misc_devnode+0x40/0x44)</span></div><div><span style="font-size: 10px;">[ 13.808869] r7:999edd5e r6:999edd60 r5:9ac47600 r4:9ac47608</span></div><div><span style="font-size: 10px;">[ 13.814546] [<804004b4>] (misc_devnode) from [<804475c0>] (device_get_devnode+0x80/0xe4)</span></div><div><span style="font-size: 10px;">[ 13.822639] [<80447540>] (device_get_devnode) from [<804477bc>] (dev_uevent+0x198/0x2cc)</span></div><div><span style="font-size: 10px;">[ 13.830724] r7:9ac47608 r6:9ac47600 r5:9adb5000 r4:9ac47608</span></div><div><span style="font-size: 10px;">[ 13.836390] [<80447624>] (dev_uevent) from [<80445d54>] (uevent_show+0xa8/0x124)</span></div><div><span style="font-size: 10px;">[ 13.843788] r8:99965000 r7:9ac47608 r6:9adb5000 r5:9ac47608 r4:9e487940</span></div><div><span style="font-size: 10px;">[ 13.850491] [<80445cac>] (uevent_show) from [<80445ba4>] (dev_attr_show+0x2c/0x58)</span></div><div><span style="font-size: 10px;">[ 13.858064] r9:9e753d80 r8:00000fff r7:9ac47608 r6:99965000 r5:80a38ba4 r4:9accee10</span></div><div><span style="font-size: 10px;">[ 13.865825] [<80445b78>] (dev_attr_show) from [<802acd08>] (sysfs_kf_seq_show+0x90/0x108)</span></div><div><span style="font-size: 10px;">[ 13.873994] r5:8073f7e4 r4:9accee10</span></div><div><span style="font-size: 10px;">[ 13.877581] [<802acc78>] (sysfs_kf_seq_show) from [<802ab5f4>] (kernfs_seq_show+0x34/0x38)</span></div><div><span style="font-size: 10px;">[ 13.885839] r10:00000001 r9:9accee28 r8:999edf60 r7:00000000 r6:00400cc0 r5:9990ba40</span></div><div><span style="font-size: 10px;">[ 13.893658] r4:9accee10 r3:802acc78</span></div><div><span style="font-size: 10px;">[ 13.897250] [<802ab5c0>] (kernfs_seq_show) from [<8025efb0>] (seq_read+0x15c/0x4ec)</span></div><div><span style="font-size: 10px;">[ 13.904913] [<8025ee54>] (seq_read) from [<802ac0e0>] (kernfs_fop_read+0x40/0x1c4)</span></div><div><span style="font-size: 10px;">[ 13.912481] r10:00000000 r9:999edf60 r8:999edf60 r7:999edf60 r6:802ac0a0 r5:00001000</span></div><div><span style="font-size: 10px;">[ 13.920296] r4:9e753d80</span></div><div><span style="font-size: 10px;">[ 13.922850] [<802ac0a0>] (kernfs_fop_read) from [<80239348>] (__vfs_read+0x44/0x188)</span></div><div><span style="font-size: 10px;">[ 13.930595] r10:00000000 r9:999edf60 r8:00001000 r7:999edf60 r6:802ac0a0 r5:80a07008</span></div><div><span style="font-size: 10px;">[ 13.938411] r4:9990ba40</span></div><div><span style="font-size: 10px;">[ 13.940952] [<80239304>] (__vfs_read) from [<80239520>] (vfs_read+0x94/0x120)</span></div><div><span style="font-size: 10px;">[ 13.948082] r10:00000000 r9:00000000 r8:00000001 r7:999edf60 r6:01b071f8 r5:9990ba40</span></div><div><span style="font-size: 10px;">[ 13.955900] r4:00001000</span></div><div><span style="font-size: 10px;">[ 13.958442] [<8023948c>] (vfs_read) from [<8023994c>] (ksys_read+0x70/0xe8)</span></div><div><span style="font-size: 10px;">[ 13.965399] r9:00000000 r8:00000000 r7:01b071f8 r6:80a07008 r5:9990ba40 r4:9990ba40</span></div><div><span style="font-size: 10px;">[ 13.973141] [<802398dc>] (ksys_read) from [<802399dc>] (sys_read+0x18/0x1c)</span></div><div><span style="font-size: 10px;">[ 13.980099] r9:999ec000 r8:801011e4 r7:00000003 r6:457f1654 r5:01b071f8 r4:01ad4150</span></div><div><span style="font-size: 10px;">[ 13.987841] [<802399c4>] (sys_read) from [<80101000>] (ret_fast_syscall+0x0/0x54)</span></div><div><span style="font-size: 10px;">[ 13.995319] Exception stack(0x999edfa8 to 0x999edff0)</span></div><div><span style="font-size: 10px;">[ 14.000368] dfa0: 01ad4150 01b071f8 00000005 01b071f8 00001000 00000000</span></div><div><span style="font-size: 10px;">[ 14.008542] dfc0: 01ad4150 01b071f8 457f1654 00000003 00001001 457f11bc 00001001 000005e8</span></div><div><span style="font-size: 10px;">[ 14.016710] dfe0: 00000070 7eb78868 4571bad4 45774f28</span></div><div><span style="font-size: 10px;">[ 14.021762] Code: e89da800 e1a0c00d e92dd800 e24cb004 (e5d03000)</span></div><div><span style="font-size: 10px;">[ 14.028037] ---[ end trace 850b9c31df4945cf ]---</span></div><div><span style="font-size: 10px;">[ 14.032675] Kernel panic - not syncing: Fatal exception</span></div><div><span style="font-size: 10px;">[ 14.037912] ---[ end Kernel panic - not syncing: Fatal exception ]---</span></div></div><div><br></div><div><br></div><div>thanks，</div><div>Byron</div></div><br><br><span title="neteasefooter"><p> </p></span>