Attachment 220116 Details for Bug 251463 – This is what I did to restore a correct value of LR in kgdb

This is what I did to restore a correct value of LR in kgdb

kgdb_stack_backtrace_and_registers.txt (text/plain), 6.57 KB, created by Dmitry Salychev on 2020-11-30 21:01:13 UTC

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Creator: Dmitry Salychev

Created: 2020-11-30 21:01:13 UTC

Size: 6.57 KB

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obsolete

>(kgdb) bt
>#0  kdb_enter (why=0xc073d1d2 "panic", msg=<optimized out>) at /usr/src/sys/kern/subr_kdb.c:486
>#1  0xc02cbe2c in vpanic (fmt=0xc07254d3 "Fatal abort", ap=...) at /usr/src/sys/kern/kern_shutdown.c:907
>#2  0xc02cbb8c in panic (fmt=0xc0a87348 <kdb_why> "\322\321s\300\024\346\016\321\322\321s\300\034\352\016\321\323Tr\300") at /usr/src/sys/kern/kern_shutdown.c:843
>#3  0xc05b3a80 in abort_fatal (tf=<optimized out>, idx=<optimized out>, fsr=<optimized out>, far=<optimized out>, prefetch=<optimized out>, td=<optimized out>, ksig=<optimized out>) at /usr/src/sys/arm/arm/trap-v6.c:616
>#4  0xc05b3600 in abort_handler (tf=<optimized out>, prefetch=<optimized out>) at /usr/src/sys/arm/arm/trap-v6.c:520
>#5  <signal handler called>
>#6  device_get_softc (dev=0x0) at /usr/src/sys/kern/subr_bus.c:2507
>#7  0x00023070 in ?? ()
>Backtrace stopped: previous frame identical to this frame (corrupt stack?)
>(kgdb) info registers 
>r0             0xc0a87348          3232265032
>r1             0x0                 0
>r2             0xd10ee914          3507415316
>r3             0x0                 0
>r4             0xc073d1d2          3228815826
>r5             0xd10eea1c          3507415580
>r6             0xc07254d3          3228718291
>r7             0x0                 0
>r8             0xd199a000          3516506112
>r9             0xc08a361c          3230283292
>r10            0xc0a77660          3232200288
>r11            0xd10ee9e0          3507415520
>r12            0xd10ee726          3507414822
>sp             0xd10ee9d8          0xd10ee9d8
>lr             0xc031b5a4          3224483236
>pc             0xc031b5b8          0xc031b5b8 <kdb_enter+92>
>cpsr           0x20000193          536871315
>(kgdb) f 4
>#4  0xc05b3600 in abort_handler (tf=<optimized out>, prefetch=<optimized out>) at /usr/src/sys/arm/arm/trap-v6.c:520
>520			if (td->td_intr_nesting_level == 0 &&
>(kgdb) info registers 
>r0             0xc0a87348          3232265032
>r1             0x0                 0
>r2             0xd10ee914          3507415316
>r3             0x0                 0
>r4             0x0                 0
>r5             0x7                 7
>r6             0x5                 5
>r7             0x7                 7
>r8             0x13                19
>r9             0xd199a000          3516506112
>r10            0x4c                76
>r11            0xd10eeae8          3507415784
>r12            0xd10ee726          3507414822
>sp             0xd10eea50          0xd10eea50
>lr             0xc05b3600          3227203072
>pc             0xc05b3600          0xc05b3600 <abort_handler+816>
>cpsr           0x20000193          536871315
>(kgdb) f 6
>#6  device_get_softc (dev=0x0) at /usr/src/sys/kern/subr_bus.c:2507
>2507		return (dev->softc);
>(kgdb) info registers 
>r0             0x0                 0
>r1             0x2                 2
>r2             0xc0661624          3227915812
>r3             0xc0843414          3229889556
>r4             0xd10eed28          3507416360
>r5             0x6                 6
>r6             0x19                25
>r7             0xd1275000          3509014528
>r8             0xd199a000          3516506112
>r9             0xd1adc410          3517826064
>r10            0xc0446904          3225708804
>r11            0xd10eeb90          3507415952
>r12            0xc0877034          3230101556
>sp             0xbfbfe798          0xbfbfe798
>lr             0x23070             143472
>pc             0xc0307b28          0xc0307b28 <device_get_softc>
>cpsr           0x20000013          536870931
>(kgdb) set $lr=0xc0661664
>(kgdb) info registers 
>r0             0x0                 0
>r1             0x2                 2
>r2             0xc0661624          3227915812
>r3             0xc0843414          3229889556
>r4             0xd10eed28          3507416360
>r5             0x6                 6
>r6             0x19                25
>r7             0xd1275000          3509014528
>r8             0xd199a000          3516506112
>r9             0xd1adc410          3517826064
>r10            0xc0446904          3225708804
>r11            0xd10eeb90          3507415952
>r12            0xc0877034          3230101556
>sp             0xbfbfe798          0xbfbfe798
>lr             0xc0661664          3227915876
>pc             0xc0307b28          0xc0307b28 <device_get_softc>
>cpsr           0x20000013          536870931
>(kgdb) bt
>#0  kdb_enter (why=0xc073d1d2 "panic", msg=<optimized out>) at /usr/src/sys/kern/subr_kdb.c:486
>#1  0xc02cbe2c in vpanic (fmt=0xc07254d3 "Fatal abort", ap=...) at /usr/src/sys/kern/kern_shutdown.c:907
>#2  0xc02cbb8c in panic (fmt=0xc0a87348 <kdb_why> "\322\321s\300\024\346\016\321\322\321s\300\034\352\016\321\323Tr\300") at /usr/src/sys/kern/kern_shutdown.c:843
>#3  0xc05b3a80 in abort_fatal (tf=<optimized out>, idx=<optimized out>, fsr=<optimized out>, far=<optimized out>, prefetch=<optimized out>, td=<optimized out>, ksig=<optimized out>) at /usr/src/sys/arm/arm/trap-v6.c:616
>#4  0xc05b3600 in abort_handler (tf=<optimized out>, prefetch=<optimized out>) at /usr/src/sys/arm/arm/trap-v6.c:520
>#5  <signal handler called>
>#6  device_get_softc (dev=0x0) at /usr/src/sys/kern/subr_bus.c:2507
>#7  0xc0661664 in cpsw_getport (dev=<optimized out>, p=0xd10eed28) at /usr/src/sys/arm/ti/cpsw/if_cpsw.c:2841
>#8  0xc008e6f0 in etherswitchioctl (cdev=<optimized out>, cmd=<optimized out>, data=<optimized out>, flags=<optimized out>, td=0xd199a000) at ./etherswitch_if.h:166
>#9  0xc01ce0fc in devfs_ioctl (ap=0xd10eebf8) at /usr/src/sys/fs/devfs/devfs_vnops.c:944
>#10 0xc03c6540 in vn_ioctl (fp=0xd19c8000, com=<optimized out>, data=0xd10eed28, active_cred=<optimized out>, td=0xd199a000) at /usr/src/sys/kern/vfs_vnops.c:1616
>#11 0xc01ce758 in devfs_ioctl_f (fp=0x0, com=2, data=0xc0661624 <cpsw_getport>, cred=0xc0843414 <etherswitch_getport_desc>, td=0xd199a000) at /usr/src/sys/fs/devfs/devfs_vnops.c:875
>#12 0xc0343688 in fo_ioctl (fp=0xd19c8000, com=3225708804, data=0xc0661624 <cpsw_getport>, active_cred=0xc0843414 <etherswitch_getport_desc>, td=0xd199a000) at /usr/src/sys/sys/file.h:343
>#13 kern_ioctl (td=0xd199a000, fd=<optimized out>, com=3225708804, data=0xc0661624 <cpsw_getport> "\360H-\351\020\260\215\342\001@\240\341") at /usr/src/sys/kern/sys_generic.c:801
>#14 0xc0343318 in sys_ioctl (td=0xd199a000, uap=0xd199a2b0) at /usr/src/sys/kern/sys_generic.c:709
>#15 0xc05b2e20 in syscallenter (td=0xd199a000) at /usr/src/sys/arm/arm/../../kern/subr_syscall.c:189
>#16 syscall (td=0xd199a000, frame=<optimized out>) at /usr/src/sys/arm/arm/syscall.c:144
>#17 swi_handler (frame=<optimized out>) at /usr/src/sys/arm/arm/syscall.c:169
>#18 <signal handler called>
>#19 0x201f8ba8 in ?? ()
>#20 0x00023070 in ?? ()
>Backtrace stopped: previous frame identical to this frame (corrupt stack?)

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Attachments on bug 251463: 220079 | 220115 | 220116 | 220181 | 220356