Re: calling getcpu with misaligned address causes kernel panic

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Colin Ian King writes via Kernel.org Bugzilla:

uname -a
./Linux hppa 6.10.6-parisc #1 SMP Debian 6.10.6-1 (2024-08-19) parisc GNU/Linux
cking@hppa:~$ ./crash 
[  991.661268] handle_unaligned: 190 callbacks suppressed
[  991.661901] Kernel: unaligned access to 0xf8c00001 in sys_getcpu+0x30/0x6c (iir 0xf3cd280)
[  991.677270] Backtrace:
[  991.679232]  [<10413c60>] handle_unaligned+0x598/0x758
[  991.679232]  [<10409854>] handle_interruption+0x1dc/0x7b8
[  991.679232]  [<10454dec>] sys_getcpu+0x30/0x6c
[  991.679232] 
[  991.679232] 
[  991.679232] Page fault: bad address: Code=26 (Data memory access rights trap) at addr f8c00000
[  991.679232] CPU: 2 PID: 725 Comm: crash Not tainted 6.10.6-parisc #1  Debian 6.10.6-1
[  991.679232] Hardware name: 9000/778/B160L
[  991.679232] 
[  991.679232]      YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
[  991.679232] PSW: 00000000000001101111111100001111 Not tainted
[  991.679232] r00-03  0006ff0f 00000000 10413c60 12de83c0
[  991.679232] r04-07  12de8080 17220940 fc000000 f8c00001
[  991.679232] r08-11  00000000 0f3cd280 f8fd5c20 f8fd2e58
[  991.679232] r12-15  00011008 00bdd7d8 00000000 00000001
[  991.679232] r16-19  12de8080 00138428 00bd5730 ff000000
[  991.679232] r20-23  00000000 00000000 00000000 12de86d8
[  991.679232] r24-27  00000000 00000000 12de8080 11148ae8
[  991.679232] r28-31  00000000 000003c0 12de8400 f8c00000
[  991.679232] sr00-03  00000000 000003c0 00000000 000003c0
[  991.679232] sr04-07  00000000 00000000 00000000 00000000
[  991.679232] 
[  991.679232] IASQ: 00000000 00000000 IAOQ: 10413598 1041359c
[  991.679232]  IIR: 0ff45280    ISR: 000003c0  IOR: f8c00000
[  991.679232]  CPU:        2   CR30: 17220940 CR31: 00000000
[  991.679232]  ORIG_R28: 00000000
[  991.679232]  IAOQ[0]: emulate_stw+0x5c/0x90
[  991.679232]  IAOQ[1]: emulate_stw+0x60/0x90
[  991.679232]  RP(r2): handle_unaligned+0x598/0x758
[  991.679232] Backtrace:
[  991.679232]  [<10413c60>] handle_unaligned+0x598/0x758
[  991.679232]  [<10409854>] handle_interruption+0x1dc/0x7b8
[  991.679232]  [<10454dec>] sys_getcpu+0x30/0x6c
[  991.679232] 
[  991.679232] Kernel panic - not syncing: Page fault: bad address

View: https://bugzilla.kernel.org/show_bug.cgi?id=219339#c1
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