[Bug 205099] KASAN hit at raid6_pq: BUG: Unable to handle kernel data access at 0x00f0fd0d

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=205099

--- Comment #34 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 299711
  --> https://bugzilla.kernel.org/attachment.cgi?id=299711&action=edit
dmesg (5.15.5, OUTLINE KASAN, PowerMac G4 DP)

Finally my G4 DP got its' fixed & overhauled PSU so I am able to continue here.

Tested kernel 5.15.5 and the original KASAN hit at raid6_pq did not show up.
Instead I am getting this now:

[...]
Running code patching self-tests ...
vmap allocation for size 33562624 failed: use vmalloc=<size> to increase size
swapper/0: vmalloc error: size 33558528, vm_struct allocation failed,
mode:0xcc0(GFP_KERNEL), nodemask=(null)
CPU: 0 PID: 1 Comm: swapper/0 Tainted: G        W        
5.15.5-gentoo-PowerMacG4 #5
Call Trace:
[f1033bb0] [c0d933c0] dump_stack_lvl+0x80/0xb0 (unreliable)
[f1033bd0] [c0516128] warn_alloc+0x11c/0x2b4
[f1033cb0] [c0508c40] __vmalloc_node_range+0xd8/0x64c
[f1033d70] [c0508a58] __vmalloc_node+0xec/0xf4
[f1033db0] [c1c0ecb0] test_code_patching+0x72c/0xd50
[f1033df0] [c0008908] do_one_initcall+0x284/0x574
[f1033ec0] [c1c03f78] kernel_init_freeable+0x510/0x51c
[f1033f10] [c000934c] kernel_init+0x24/0x140
[f1033f30] [c0033148] ret_from_kernel_thread+0x14/0x1c
Mem-Info:
active_anon:0 inactive_anon:0 isolated_anon:0
 active_file:0 inactive_file:0 isolated_file:0
 unevictable:0 dirty:0 writeback:0
 slab_reclaimable:1306 slab_unreclaimable:4214
 mapped:0 shmem:0 pagetables:0 bounce:0
 kernel_misc_reclaimable:0
 free:474459 free_pcp:592 free_cma:0
Node 0 active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB
unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:0kB dirty:0kB
writeback:0kB shmem:0kB writeback_tmp:0kB kernel_stack:840kB pagetables:0kB
all_unreclaimable? no
DMA free:588612kB min:3144kB low:3928kB high:4712kB reserved_highatomic:0KB
active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB
unevictable:0kB writepending:0kB present:786432kB managed:618264kB mlocked:0kB
bounce:0kB free_pcp:1964kB local_pcp:1568kB free_cma:0kB
lowmem_reserve[]: 0 0 1280 1280
HighMem free:1309224kB min:512kB low:2176kB high:3840kB reserved_highatomic:0KB
active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB
unevictable:0kB writepending:0kB present:1310720kB managed:1310720kB
mlocked:0kB bounce:0kB free_pcp:404kB local_pcp:116kB free_cma:0kB
lowmem_reserve[]: 0 0 0 0
DMA: 5*4kB (ME) 2*8kB (UM) 4*16kB (M) 5*32kB (ME) 1*64kB (M) 4*128kB (UME)
4*256kB (ME) 4*512kB (UM) 3*1024kB (M) 4*2048kB (ME) 140*4096kB (M) = 588612kB
HighMem: 0*4kB 1*8kB (U) 0*16kB 1*32kB (U) 0*64kB 2*128kB (U) 1*256kB (U)
0*512kB 0*1024kB 1*2048kB (U) 319*4096kB (M) = 1309224kB
0 total pagecache pages
0 pages in swap cache
Swap cache stats: add 0, delete 0, find 0/0
Free swap  = 0kB
Total swap = 0kB
524288 pages RAM
327680 pages HighMem/MovableOnly
42042 pages reserved
code-patching: test failed at line 598
[...]

This makes me wonder whether KASAN is working correctly when not enough vmap
size is available. I did set it to vmalloc=64M via Kernel command line but this
does not seem to be reckognized. Same situation with INLINE KASAN. In both
cases with VMAP_STACK and CONFIG_THREAD_SHIFT=14.

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