Kernel panic

[kloenk]

When including the rust_example driver (not as module) I get a kernel panic:

[    0.487414][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.9.0-rc2+ #3
[    0.487414][    T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-48-gd9c812d4
[    0.487414][    T1] RIP: 0010:__memcpy+0x12/0x20
[    0.487414][    T1] Code: 8c 94 00 00 74 0a c7 05 a8 8c 94 00 0f 00 00 00 c3 31 c0 c3 cc cc cc cc 0f 14
[    0.487414][    T1] RSP: 0000:ffffbcf0400133b8 EFLAGS: 00010202
[    0.487414][    T1] RAX: ffffbcf040013496 RBX: 00000000000003d2 RCX: 000000000000007a
[    0.487414][    T1] RDX: 0000000000000002 RSI: 3674fd8948f23948 RDI: ffffbcf040013496
[    0.487414][    T1] RBP: ffffbcf0400133d0 R08: 0000000000000000 R09: ffffbcf040013480
[    0.487414][    T1] R10: 0000000000000123 R11: ffffffff89997710 R12: ffffffff8a812258
[    0.487414][    T1] R13: ffffffff8a5eadd0 R14: ffffbcf040013480 R15: ffffbcf040013898
[    0.487414][    T1] FS:  0000000000000000(0000) GS:ffffa04c87a00000(0000) knlGS:0000000000000000
[    0.487414][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.487414][    T1] CR2: 0000000000000000 CR3: 0000000005c0a000 CR4: 00000000000006f0
[    0.487414][    T1] Call Trace:
[    0.487414][    T1]  ? do_one_initcall+0xb8/0x250
[    0.487414][    T1]  ? alloc_pages_current+0x10a/0x1b0
[    0.487414][    T1]  ? allocate_slab+0xf7/0x4c0
[    0.487414][    T1]  ? ida_alloc_range+0x391/0x3d0
[    0.487414][    T1]  ? parse_one+0x53/0x270
[    0.487414][    T1]  ? do_initcall_level+0x88/0x88
[    0.487414][    T1]  ? parse_args+0x118/0x220
[    0.487414][    T1]  ? do_initcall_level+0x88/0x88
[    0.487414][    T1]  ? do_initcall_level+0x7e/0x88
[    0.487414][    T1]  ? do_initcalls+0x44/0x6d
[    0.487414][    T1]  ? kernel_init_freeable+0xd6/0x11d
[    0.487414][    T1]  ? rest_init+0xa0/0xa0
[    0.487414][    T1]  ? kernel_init+0x5/0x180
[    0.487414][    T1]  ? ret_from_fork+0x22/0x30
[    0.487414][    T1] Modules linked in:
[    0.515297][    T1] ---[ end trace 13ad6358da39c417 ]---
[    0.516114][    T1] RIP: 0010:__memcpy+0x12/0x20
[    0.516796][    T1] Code: 8c 94 00 00 74 0a c7 05 a8 8c 94 00 0f 00 00 00 c3 31 c0 c3 cc cc cc cc 0f 1f 44 00 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 <f3> 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 84
[    0.519649][    T1] RSP: 0000:ffffbcf0400133b8 EFLAGS: 00010202
[    0.520539][    T1] RAX: ffffbcf040013496 RBX: 00000000000003d2 RCX: 000000000000007a
[    0.521701][    T1] RDX: 0000000000000002 RSI: 3674fd8948f23948 RDI: ffffbcf040013496
[    0.522875][    T1] RBP: ffffbcf0400133d0 R08: 0000000000000000 R09: ffffbcf040013480
[    0.524036][    T1] R10: 0000000000000123 R11: ffffffff89997710 R12: ffffffff8a812258
[    0.525198][    T1] R13: ffffffff8a5eadd0 R14: ffffbcf040013480 R15: ffffbcf040013898
[    0.526361][    T1] FS:  0000000000000000(0000) GS:ffffa04c87a00000(0000) knlGS:0000000000000000
[    0.527666][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.528626][    T1] CR2: 0000000000000000 CR3: 0000000005c0a000 CR4: 00000000000006f0
[    0.529790][    T1] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[    0.530780][    T1] Kernel Offset: 0x8400000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[    0.530780][    T1] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ]---

Config and kernel console here: https://gist.github.com/Kloenk/aad17db1adc313ec49a51712c03060b0

[ojeda]

Edit: never mind, I didn't read the trace. There is this in the log above the panic:

[    0.486964][    T1] general protection fault: 0000 [#1] SMP PTI

and it comes while running the initialization for the example module (do_one_initcall). We get as far as printing:

[    0.484220][    T1] Rust Example (init)
[    0.484794][    T1] Am I built-in? true
[    0.485380][    T1] Parameters:
[    0.485876][    T1]   my_bool:  true
[    0.486425][    T1]   my_i32:   42

and then it crashes while copying some memory. Let me try to reproduce it.

[kloenk]

Here is my initrd, if you want to use it.
initrd.cpio.gz

[ojeda]

Reproduced with LLVM 10 on my side.

[kloenk]

Mine was llvm11, as packages in my nix flake

[ojeda]

@kloenk Can you please confirm #28 fixes this for you?