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SubjectNULL pointer dereference during memory hotremove
This panic is unrelated to circular lock issue that I reported in a
separate thread, that also happens during memory hotremove.

xakep ~/x/linux$ git describe
v5.1-12317-ga6a4b66bd8f4

Config is attached, qemu script is following:

qemu-system-x86_64 \
-enable-kvm \
-cpu host \
-parallel none \
-echr 1 \
-serial none \
-chardev stdio,id=console,signal=off,mux=on \
-serial chardev:console \
-mon chardev=console \
-vga none \
-display none \
-kernel pmem/native/arch/x86/boot/bzImage \
-m 8G,slots=1,maxmem=16G \
-smp 8 \
-fsdev local,id=virtfs1,path=/,security_model=none \
-device virtio-9p-pci,fsdev=virtfs1,mount_tag=hostfs \
-append 'earlyprintk=serial,ttyS0,115200 console=ttyS0
TERM=xterm ip=dhcp memmap=2G!6G loglevel=7'

The unusual case with this script is that 2G reserved for pmem device:
memmap=2G!6G. Otherwise, it is a normal layout. Unfortunately, it does
not happen every time, but I have hit it a couple times.


# QEMU 4.0.0 monitor - type 'help' for more information
(qemu) object_add memory-backend-ram,id=mem1,size=1G
(qemu) device_add pc-dimm,id=dimm1,memdev=mem1
# echo online_movable > /sys/devices/system/memory/memory79/state
[ 40.219090] Built 1 zonelists, mobility grouping on. Total pages: 1529279
[ 40.223258] Policy zone: Normal
# (qemu) device_del dimm1
(qemu) [ 49.624600] Offlined Pages 32768
[ 49.625796] Built 1 zonelists, mobility grouping on. Total pages: 1516352
[ 49.627841] Policy zone: Normal
[ 49.630932] BUG: kernel NULL pointer dereference, address: 0000000000000698
[ 49.633704] #PF: supervisor read access in kernel mode
[ 49.635689] #PF: error_code(0x0000) - not-present page
[ 49.637620] PGD 8000000236b59067 P4D 8000000236b59067 PUD 2358fe067 PMD 0
[ 49.640163] Oops: 0000 [#1] SMP PTI
[ 49.641223] CPU: 0 PID: 7 Comm: kworker/u16:0 Not tainted 5.1.0_pt_pmem #38
[ 49.643183] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.12.0-20181126_142135-anatol 04/01/2014
[ 49.645858] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
[ 49.647101] RIP: 0010:__remove_pages+0x1a/0x460
[ 49.648165] Code: e9 bb a9 fd ff 0f 0b 66 0f 1f 84 00 00 00 00 00
41 57 48 89 f8 49 89 ff 41 56 49 89 f6 41 55 41 54 55 53 48 89 d3 48
83 ec 50 <48> 2b 47 58 48 89 4c 24 48 48 3d 00 19 00 00 75 09 48 85 c9
0f 85
[ 49.651925] RSP: 0018:ffffbd1000c8fcb8 EFLAGS: 00010286
[ 49.652857] RAX: 0000000000000640 RBX: 0000000000040000 RCX: 0000000000000000
[ 49.654139] RDX: 0000000000040000 RSI: 0000000000240000 RDI: 0000000000000640
[ 49.655393] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000040000000
[ 49.656523] R10: 0000000040000000 R11: 0000000240000000 R12: 0000000040000000
[ 49.657654] R13: 0000000240000000 R14: 0000000000240000 R15: 0000000000000640
[ 49.658828] FS: 0000000000000000(0000) GS:ffff9b4bf9800000(0000)
knlGS:0000000000000000
[ 49.660178] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 49.661033] CR2: 0000000000000698 CR3: 00000002382e0006 CR4: 0000000000360ef0
[ 49.662114] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 49.663172] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 49.664243] Call Trace:
[ 49.664622] ? memblock_isolate_range+0xc4/0x139
[ 49.665290] ? firmware_map_add_hotplug+0x7e/0xde
[ 49.665908] ? memblock_remove_region+0x30/0x74
[ 49.666498] arch_remove_memory+0x6f/0xa0
[ 49.667012] __remove_memory+0xab/0x130
[ 49.667492] ? walk_memory_range+0xa1/0xe0
[ 49.668008] acpi_memory_device_remove+0x67/0xe0
[ 49.668595] acpi_bus_trim+0x50/0x90
[ 49.669051] acpi_device_hotplug+0x2fa/0x3e0
[ 49.669590] acpi_hotplug_work_fn+0x15/0x20
[ 49.670116] process_one_work+0x2a0/0x650
[ 49.670577] worker_thread+0x34/0x3d0
[ 49.670997] ? process_one_work+0x650/0x650
[ 49.671503] kthread+0x118/0x130
[ 49.671879] ? kthread_create_on_node+0x60/0x60
[ 49.672411] ret_from_fork+0x3a/0x50
[ 49.672836] Modules linked in:
[ 49.673190] CR2: 0000000000000698
[ 49.673583] ---[ end trace 6b727d3a8ce48aa1 ]---
[ 49.674120] RIP: 0010:__remove_pages+0x1a/0x460
[ 49.674624] Code: e9 bb a9 fd ff 0f 0b 66 0f 1f 84 00 00 00 00 00
41 57 48 89 f8 49 89 ff 41 56 49 89 f6 41 55 41 54 55 53 48 89 d3 48
83 ec 50 <48> 2b 47 58 48 89 4c 24 48 48 3d 00 19 00 00 75 09 48 85 c9
0f 85
[ 49.676600] RSP: 0018:ffffbd1000c8fcb8 EFLAGS: 00010286
[ 49.677159] RAX: 0000000000000640 RBX: 0000000000040000 RCX: 0000000000000000
[ 49.677960] RDX: 0000000000040000 RSI: 0000000000240000 RDI: 0000000000000640
[ 49.678813] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000040000000
[ 49.679633] R10: 0000000040000000 R11: 0000000240000000 R12: 0000000040000000
[ 49.680455] R13: 0000000240000000 R14: 0000000000240000 R15: 0000000000000640
[ 49.681243] FS: 0000000000000000(0000) GS:ffff9b4bf9800000(0000)
knlGS:0000000000000000
[ 49.682168] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 49.682813] CR2: 0000000000000698 CR3: 00000002382e0006 CR4: 0000000000360ef0
[ 49.683573] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 49.684239] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 49.684901] BUG: sleeping function called from invalid context at
include/linux/percpu-rwsem.h:34
[ 49.685690] in_atomic(): 0, irqs_disabled(): 1, pid: 7, name: kworker/u16:0
[ 49.686314] INFO: lockdep is turned off.
[ 49.686684] irq event stamp: 22546
[ 49.687003] hardirqs last enabled at (22545): [<ffffffff8c1fe5ba>]
kfree+0xba/0x230
[ 49.687692] hardirqs last disabled at (22546): [<ffffffff8c001b53>]
trace_hardirqs_off_thunk+0x1a/0x1c
[ 49.688561] softirqs last enabled at (22526): [<ffffffff8ce0033e>]
__do_softirq+0x33e/0x455
[ 49.689348] softirqs last disabled at (22519): [<ffffffff8c06ea36>]
irq_exit+0xb6/0xc0
[ 49.690088] CPU: 0 PID: 7 Comm: kworker/u16:0 Tainted: G D
5.1.0_pt_pmem #38
[ 49.690811] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.12.0-20181126_142135-anatol 04/01/2014
[ 49.691704] Workqueue: kacpi_hotplug acpi_hotplug_work_fn
[ 49.692185] Call Trace:
[ 49.692398] dump_stack+0x67/0x90
[ 49.692690] ___might_sleep.cold.87+0x9f/0xaf
[ 49.693099] exit_signals+0x2b/0x240
[ 49.693453] do_exit+0xab/0xc10
[ 49.693770] ? process_one_work+0x650/0x650
[ 49.694160] ? kthread+0x118/0x130
[ 49.694487] rewind_stack_do_exit+0x17/0x20
[ 77.418619] random: fast init done
[unhandled content-type:application/x-bzip]
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