> Hello,
>
> FYI this happens in mainline kernel 4.17.0-rc3.
> It looks like a new regression since v4.17-rc1.
>
> It occurs in 2 out of 2 boots.
>
> [ 54.222599] Magic number: 14:276:994
> [ 54.223261] tty ttyd7: hash matches
> [ 54.223841] tty ttyaa: hash matches
> [ 54.227288] Lustre: Lustre: Build Version: 2.6.99
> [ 54.232977] LustreError: 1:0:(class_obd.c:465:obdclass_init()) cannot register 241 err -16
This looks like the misc register bug that is now fixed in the
staging-test branch. Can you try
git commit ba833f145745c5ca4d1d45b1de2541fe34b8f100 (staging: lustre:
libcfs: use dynamic minors for /dev/{lnet, obd})
from the staging-test branch to see if it resolves your problems?
> [ 54.236561] BUG: unable to handle kernel NULL pointer dereference at 0000000000000004
> [ 54.237836] PGD 0 P4D 0
> [ 54.238266] Oops: 0000 [#1] SMP
> [ 54.238780] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.17.0-rc3 #1
> [ 54.239775] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
> [ 54.241214] RIP: 0010:kmem_cache_alloc+0x27/0x2ce:
> slob_alloc_node at mm/slob.c:546
> (inlined by) kmem_cache_alloc at mm/slob.c:567
> [ 54.241956] RSP: 0000:ffff88001d21bde8 EFLAGS: 00010246
> [ 54.242791] RAX: 0000000000000000 RBX: 0000000001408040 RCX: 0000000000000000
> [ 54.243933] RDX: ffff88001d216000 RSI: 0000000000000000 RDI: ffffffff83752918
> [ 54.245072] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> [ 54.246213] R10: 0000000000000000 R11: 0000000000000020 R12: 00000000a0000000
> [ 54.247337] R13: 0000000000000000 R14: 00000000a0000000 R15: ffffffff8407cb7e
> [ 54.248613] FS: 0000000000000000(0000) GS:ffff88001e400000(0000) knlGS:0000000000000000
> [ 54.249887] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 54.250803] CR2: 0000000000000004 CR3: 0000000003269000 CR4: 00000000000006a0
> [ 54.251939] Call Trace:
> [ 54.252358] ? native_patch+0x195/0x195:
> __raw_callee_save___native_queued_spin_unlock at ??:?
> [ 54.252976] ? lustre_init+0x189/0x247:
> IS_ERR at include/linux/err.h:36
> (inlined by) lustre_init at drivers/staging/lustre/lustre/llite/super25.c:133
> [ 54.253590] cl_env_new+0x2b/0xb9:
> cl_env_new at drivers/staging/lustre/lustre/obdclass/cl_object.c:597
> [ 54.254126] cl_env_alloc+0x11/0xae:
> IS_ERR at include/linux/err.h:36
> (inlined by) cl_env_alloc at drivers/staging/lustre/lustre/obdclass/cl_object.c:718
> [ 54.254713] ? lmv_init+0x2d/0x2d:
> cfs_cdebug_show at drivers/staging/lustre/include/linux/libcfs/libcfs_debug.h:111
> (inlined by) lustre_init at drivers/staging/lustre/lustre/llite/super25.c:97
> [ 54.255259] lustre_init+0x189/0x247:
> IS_ERR at include/linux/err.h:36
> (inlined by) lustre_init at drivers/staging/lustre/lustre/llite/super25.c:133
> [ 54.255839] do_one_initcall+0x13d/0x36c:
> __read_once_size at include/linux/compiler.h:188
> (inlined by) arch_atomic_read at arch/x86/include/asm/atomic.h:31
> (inlined by) atomic_read at include/asm-generic/atomic-instrumented.h:22
> (inlined by) static_key_count at include/linux/jump_label.h:194
> (inlined by) static_key_false at include/linux/jump_label.h:206
> (inlined by) trace_initcall_finish at include/trace/events/initcall.h:44
> (inlined by) do_one_initcall at init/main.c:884
> [ 54.256597] ? parse_args+0x81/0x273:
> arch_local_save_flags at arch/x86/include/asm/paravirt.h:778
> (inlined by) parse_args at kernel/params.c:190
> [ 54.257177] ? do_early_param+0x88/0x88:
> repair_env_string at init/main.c:251
> [ 54.257791] kernel_init_freeable+0x338/0x3d3:
> do_initcall_level at init/main.c:950
> (inlined by) do_initcalls at init/main.c:959
> (inlined by) do_basic_setup at init/main.c:977
> (inlined by) kernel_init_freeable at init/main.c:1127
> [ 54.258492] ? rest_init+0x13c/0x13c:
> kernel_init at init/main.c:1053
> [ 54.259068] kernel_init+0x5/0xe6:
> kernel_init at init/main.c:1055
> [ 54.259609] ret_from_fork+0x1f/0x30:
> ret_from_fork at arch/x86/entry/entry_64.S:418
> [ 54.260189] Code: 0c 31 c0 c3 41 57 41 56 41 55 41 54 55 53 48 89 fd 48 83 ec 18 8b 1d 52 2e 6b 02 21 f3 89 df e8 90 0c fb ff 89 df e8 b9 0c fb ff <8b> 7d 04 81 ff ff 0f 00 00 0f 87 f3 00 00 00 8b 55 08 89 de e8
> [ 54.263237] RIP: kmem_cache_alloc+0x27/0x2ce:
> slob_alloc_node at mm/slob.c:546
> (inlined by) kmem_cache_alloc at mm/slob.c:567 RSP: ffff88001d21bde8
> [ 54.264322] CR2: 0000000000000004
> [ 54.264865] ---[ end trace 612192cbc2d7395d ]---
> [ 54.265604] Kernel panic - not syncing: Fatal exception
>
> Attached the full dmesg, kconfig and reproduce scripts.
>
> Thanks,
> Fengguang
>
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