ZFS Large kmem_alloc(129024, 0x1000) failure on 5.15.0-1026-aws

[arieleizenberg]

Mounting ZFS on an out-of-the-box Ubuntu 22.04 on AWS (no custom modules), yields Large kmem_alloc(129024, 0x1000):
Kernel: 5.15.0-1026-aws #30-Ubuntu SMP Wed Nov 23 14:15:21 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

[  107.057438] Large kmem_alloc(129024, 0x1000), please file an issue at:
               https://github.com/openzfs/zfs/issues/new
[  107.057444] CPU: 322 PID: 4504 Comm: modprobe Tainted: P           O      5.15.0-1026-aws #30-Ubuntu
[  107.057448] Hardware name: Amazon EC2 u-6tb1.112xlarge/, BIOS 1.0 10/16/2017
[  107.057449] Call Trace:
[  107.057451]  <TASK>
[  107.057454]  show_stack+0x52/0x5c
[  107.057466]  dump_stack_lvl+0x4a/0x63
[  107.057474]  dump_stack+0x10/0x16
[  107.057476]  spl_kmem_alloc_impl.cold+0x16/0x1b [spl]
[  107.057488]  spl_kmem_zalloc+0x19/0x20 [spl]
[  107.057493]  zstd_mempool_init+0x2d/0xf1 [zzstd]
[  107.057500]  ? zstd_meminit+0x2e/0x2e [zzstd]
[  107.057505]  zstd_meminit+0xe/0x2e [zzstd]
[  107.057510]  init_module+0x1c/0xe81 [zzstd]
[  107.057515]  do_one_initcall+0x46/0x1e0
[  107.057523]  ? kmem_cache_alloc_trace+0x19e/0x2e0
[  107.057531]  do_init_module+0x52/0x260
[  107.057534]  load_module+0xb2b/0xbc0
[  107.057537]  __do_sys_finit_module+0xbf/0x120
[  107.057538]  __x64_sys_finit_module+0x18/0x20
[  107.057540]  do_syscall_64+0x59/0xc0
[  107.057545]  ? fput+0x13/0x20
[  107.057550]  ? ksys_mmap_pgoff+0x154/0x2c0
[  107.057554]  ? exit_to_user_mode_prepare+0x37/0xb0
[  107.057560]  ? syscall_exit_to_user_mode+0x27/0x50
[  107.057565]  ? __x64_sys_mmap+0x33/0x50
[  107.057569]  ? do_syscall_64+0x69/0xc0
[  107.057570]  ? syscall_exit_to_user_mode+0x27/0x50
[  107.057572]  ? __x64_sys_lseek+0x18/0x20
[  107.057579]  ? do_syscall_64+0x69/0xc0
[  107.057580]  ? do_syscall_64+0x69/0xc0
[  107.057582]  ? do_syscall_64+0x69/0xc0
[  107.057583]  ? do_syscall_64+0x69/0xc0
[  107.057585]  entry_SYSCALL_64_after_hwframe+0x61/0xcb
[  107.057595] RIP: 0033:0x7f7ac1628a3d
[  107.057597] Code: 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c3 a3 0f 00 f7 d8 64 89 01 48
[  107.057599] RSP: 002b:00007fff39ebacf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[  107.057602] RAX: ffffffffffffffda RBX: 00005599bfe010f0 RCX: 00007f7ac1628a3d
[  107.057603] RDX: 0000000000000000 RSI: 00005599bf7f7cd2 RDI: 0000000000000009
[  107.057604] RBP: 0000000000040000 R08: 0000000000000000 R09: 0000000000000011
[  107.057606] R10: 0000000000000009 R11: 0000000000000246 R12: 00005599bf7f7cd2
[  107.057607] R13: 00005599bfe010b0 R14: 00005599bfe00a60 R15: 00005599bfe07c60
[  107.057608]  </TASK>
[  107.057647] Large kmem_alloc(129024, 0x1000), please file an issue at:
               https://github.com/openzfs/zfs/issues/new
[  107.057649] CPU: 322 PID: 4504 Comm: modprobe Tainted: P           O      5.15.0-1026-aws #30-Ubuntu
[  107.057650] Hardware name: Amazon EC2 u-6tb1.112xlarge/, BIOS 1.0 10/16/2017
[  107.057651] Call Trace:
[  107.057652]  <TASK>
[  107.057653]  show_stack+0x52/0x5c
[  107.057655]  dump_stack_lvl+0x4a/0x63
[  107.057657]  dump_stack+0x10/0x16
[  107.057660]  spl_kmem_alloc_impl.cold+0x16/0x1b [spl]
[  107.057667]  spl_kmem_zalloc+0x19/0x20 [spl]
[  107.057672]  zstd_mempool_init+0x52/0xf1 [zzstd]
[  107.057677]  ? zstd_meminit+0x2e/0x2e [zzstd]
[  107.057682]  zstd_meminit+0xe/0x2e [zzstd]
[  107.057687]  init_module+0x1c/0xe81 [zzstd]
[  107.057692]  do_one_initcall+0x46/0x1e0
[  107.057694]  ? kmem_cache_alloc_trace+0x19e/0x2e0
[  107.057697]  do_init_module+0x52/0x260
[  107.057699]  load_module+0xb2b/0xbc0
[  107.057701]  __do_sys_finit_module+0xbf/0x120
[  107.057703]  __x64_sys_finit_module+0x18/0x20
[  107.057705]  do_syscall_64+0x59/0xc0
[  107.057707]  ? fput+0x13/0x20
[  107.057708]  ? ksys_mmap_pgoff+0x154/0x2c0
[  107.057710]  ? exit_to_user_mode_prepare+0x37/0xb0
[  107.057711]  ? syscall_exit_to_user_mode+0x27/0x50
[  107.057714]  ? __x64_sys_mmap+0x33/0x50
[  107.057715]  ? do_syscall_64+0x69/0xc0
[  107.057717]  ? syscall_exit_to_user_mode+0x27/0x50
[  107.057719]  ? __x64_sys_lseek+0x18/0x20
[  107.057722]  ? do_syscall_64+0x69/0xc0
[  107.057723]  ? do_syscall_64+0x69/0xc0
[  107.057725]  ? do_syscall_64+0x69/0xc0
[  107.057726]  ? do_syscall_64+0x69/0xc0
[  107.057728]  entry_SYSCALL_64_after_hwframe+0x61/0xcb
[  107.057730] RIP: 0033:0x7f7ac1628a3d
[  107.057731] Code: 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c3 a3 0f 00 f7 d8 64 89 01 48
[  107.057733] RSP: 002b:00007fff39ebacf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[  107.057734] RAX: ffffffffffffffda RBX: 00005599bfe010f0 RCX: 00007f7ac1628a3d
[  107.057736] RDX: 0000000000000000 RSI: 00005599bf7f7cd2 RDI: 0000000000000009
[  107.057737] RBP: 0000000000040000 R08: 0000000000000000 R09: 0000000000000011
[  107.057738] R10: 0000000000000009 R11: 0000000000000246 R12: 00005599bf7f7cd2
[  107.057739] R13: 00005599bfe010b0 R14: 00005599bfe00a60 R15: 00005599bfe07c60
[  107.057741]  </TASK>

[ryao]

This is a warning rather than a failure.