Hi!
If I try to change the mode of a devdax namespace that's in use (mapped by
some process), ndctl hangs:
[ 9546.754673] INFO: task ndctl:3907 blocked for more than 1208 seconds.
[ 9546.754677] Not tainted 5.3.0-00048-g7f09b8bce091 #1
[ 9546.754679] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ 9546.754681] ndctl D 0 3907 3856 0x00004004
[ 9546.754684] Call Trace:
[ 9546.754689] ? __schedule+0x281/0x670
[ 9546.754692] ? __switch_to_asm+0x34/0x70
[ 9546.754694] ? __switch_to_asm+0x34/0x70
[ 9546.754696] schedule+0x39/0xa0
[ 9546.754699] schedule_timeout+0x22b/0x320
[ 9546.754701] ? __switch_to_asm+0x34/0x70
[ 9546.754703] ? __switch_to_asm+0x40/0x70
[ 9546.754705] ? __switch_to_asm+0x34/0x70
[ 9546.754707] ? __switch_to+0x162/0x440
[ 9546.754710] ? apic_timer_interrupt+0xa/0x20
[ 9546.754712] wait_for_completion+0x100/0x150
[ 9546.754714] ? wake_up_q+0x60/0x60
[ 9546.754718] dev_pagemap_cleanup+0x47/0x60
[ 9546.754720] devm_memremap_pages_release+0xc5/0x220
[ 9546.754724] release_nodes+0x221/0x270
[ 9546.754728] dax_pmem_compat_release+0x30/0x50 [dax_pmem_compat]
[ 9546.754730] ? dax_pmem_compat_remove+0x20/0x20 [dax_pmem_compat]
[ 9546.754733] device_for_each_child+0x57/0x90
[ 9546.754736] dax_pmem_compat_remove+0x13/0x20 [dax_pmem_compat]
[ 9546.754739] nvdimm_bus_remove+0x4e/0xc0
[ 9546.754741] device_release_driver_internal+0xd8/0x1b0
[ 9546.754743] unbind_store+0xff/0x130
[ 9546.754746] kernfs_fop_write+0x140/0x1b0
[ 9546.754749] vfs_write+0xe4/0x1d0
[ 9546.754751] ksys_write+0x70/0x100
[ 9546.754754] do_syscall_64+0x50/0x100
[ 9546.754756] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 9546.754758] RIP: 0033:0x7f2d375dfad4
[ 9546.754762] Code: Bad RIP value.
[ 9546.754763] RSP: 002b:00007ffd61eca4e8 EFLAGS: 00000246 ORIG_RAX:
0000000000000001
[ 9546.754766] RAX: ffffffffffffffda RBX: 000055fb48f0982f RCX: 00007f2d375dfad4
[ 9546.754767] RDX: 0000000000000007 RSI: 000055fb48f0982f RDI: 0000000000000003
[ 9546.754769] RBP: 0000000000000007 R08: 00000000ffffffff R09: 00007ffd61eca3c0
[ 9546.754770] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
[ 9546.754771] R13: 00007f2d37166e70 R14: 0000000000000000 R15: 000055fb48f0c900
Fake pmem (memmap=4G!16G), the command is:
ndctl create-namespace -e namespace0.0 -m fsdax -f
-f is needed as a label-less fake pmem namespace is always active.
According to the man page, reconfiguring in that case is not allowed (duh),
and the operation is supposed to gracefully fail.
Meow!
--
⢀⣴⠾⠻⢶⣦⠀ A MAP07 (Dead Simple) raspberry tincture recipe: 0.5l 95% alcohol,
⣾⠁⢠⠒⠀⣿⡁ 1kg raspberries, 0.4kg sugar; put into a big jar for 1 month.
⢿⡄⠘⠷⠚⠋⠀ Filter out and throw away the fruits (can dump them into a cake,
⠈⠳⣄⠀⠀⠀⠀ etc), let the drink age at least 3-6 months.
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