Hi All， any suggest or comments，many thanks.
On 2023/9/6 20:42, Kefeng Wang wrote:
This is a RFC, even patch3 is a hack to fix the softlock issue when
populate or depopulate pte with large region, looking forward to your
reply and advise, thanks.
Here is full stack，for populate pte，
[ C3] watchdog: BUG: soft lockup - CPU#3 stuck for 26s! [insmod:458]
[ C3] Modules linked in: test(OE+)
[ C3] irq event stamp: 320776
[ C3] hardirqs last enabled at (320775): [<ffff8000815a0c98>]
_raw_spin_unlock_irqrestore+0x98/0xb8
[ C3] hardirqs last disabled at (320776): [<ffff8000815816e0>]
el1_interrupt+0x38/0xa8
[ C3] softirqs last enabled at (318174): [<ffff800080040ba8>]
__do_softirq+0x658/0x7ac
[ C3] softirqs last disabled at (318169): [<ffff800080047fd8>]
____do_softirq+0x18/0x30
[ C3] CPU: 3 PID: 458 Comm: insmod Tainted: G OE
6.5.0+ #595
[ C3] Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015
[ C3] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ C3] pc : _raw_spin_unlock_irqrestore+0x50/0xb8
[ C3] lr : _raw_spin_unlock_irqrestore+0x98/0xb8
[ C3] sp : ffff800093386d70
[ C3] x29: ffff800093386d70 x28: 0000000000000801 x27: ffff0007ffffa9c0
[ C3] x26: 0000000000000000 x25: 000000000000003f x24: fffffc0004353708
[ C3] x23: ffff0006d476bad8 x22: fffffc0004353748 x21: 0000000000000000
[ C3] x20: ffff0007ffffafc0 x19: 0000000000000000 x18: 0000000000000000
[ C3] x17: ffff80008024e7fc x16: ffff80008055a8f0 x15: ffff80008024ec60
[ C3] x14: ffff80008024ead0 x13: ffff80008024e7fc x12: ffff6000fffff5f9
[ C3] x11: 1fffe000fffff5f8 x10: ffff6000fffff5f8 x9 : 1fffe000fffff5f8
[ C3] x8 : dfff800000000000 x7 : 00000000f2000000 x6 : dfff800000000000
[ C3] x5 : 00000000f2f2f200 x4 : dfff800000000000 x3 : ffff700012670d70
[ C3] x2 : 0000000000000001 x1 : c9a5dbfae610fa24 x0 : 000000000004e507
[ C3] Call trace:
[ C3] _raw_spin_unlock_irqrestore+0x50/0xb8
[ C3] rmqueue_bulk+0x434/0x6b8
[ C3] get_page_from_freelist+0xdd4/0x1680
[ C3] __alloc_pages+0x244/0x508
[ C3] alloc_pages+0xf0/0x218
[ C3] __get_free_pages+0x1c/0x50
[ C3] kasan_populate_vmalloc_pte+0x30/0x188
[ C3] __apply_to_page_range+0x3ec/0x650
[ C3] apply_to_page_range+0x1c/0x30
[ C3] kasan_populate_vmalloc+0x60/0x70
[ C3] alloc_vmap_area.part.67+0x328/0xe50
[ C3] alloc_vmap_area+0x4c/0x78
[ C3] __get_vm_area_node.constprop.76+0x130/0x240
[ C3] __vmalloc_node_range+0x12c/0x340
[ C3] __vmalloc_node+0x8c/0xb0
[ C3] vmalloc+0x2c/0x40
[ C3] show_mem_init+0x1c/0xff8 [test]
[ C3] do_one_initcall+0xe4/0x500
[ C3] do_init_module+0x100/0x358
[ C3] load_module+0x2e64/0x2fc8
[ C3] init_module_from_file+0xec/0x148
[ C3] idempotent_init_module+0x278/0x380
[ C3] __arm64_sys_finit_module+0x88/0xf8
[ C3] invoke_syscall+0x64/0x188
[ C3] el0_svc_common.constprop.1+0xec/0x198
[ C3] do_el0_svc+0x48/0xc8
[ C3] el0_svc+0x3c/0xe8
[ C3] el0t_64_sync_handler+0xa0/0xc8
[ C3] el0t_64_sync+0x188/0x190
and for depopuldate pte，
[ C6] watchdog: BUG: soft lockup - CPU#6 stuck for 48s! [kworker/6:1:59]
[ C6] Modules linked in: test(OE+)
[ C6] irq event stamp: 39458
[ C6] hardirqs last enabled at (39457): [<ffff8000815a0c98>]
_raw_spin_unlock_irqrestore+0x98/0xb8
[ C6] hardirqs last disabled at (39458): [<ffff8000815816e0>]
el1_interrupt+0x38/0xa8
[ C6] softirqs last enabled at (39420): [<ffff800080040ba8>]
__do_softirq+0x658/0x7ac
[ C6] softirqs last disabled at (39415): [<ffff800080047fd8>]
____do_softirq+0x18/0x30
[ C6] CPU: 6 PID: 59 Comm: kworker/6:1 Tainted: G OEL
6.5.0+ #595
[ C6] Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015
[ C6] Workqueue: events drain_vmap_area_work
[ C6] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ C6] pc : _raw_spin_unlock_irqrestore+0x50/0xb8
[ C6] lr : _raw_spin_unlock_irqrestore+0x98/0xb8
[ C6] sp : ffff80008fe676b0
[ C6] x29: ffff80008fe676b0 x28: fffffc000601d310 x27: ffff000edf5dfa80
[ C6] x26: ffff000edf5dfad8 x25: 0000000000000000 x24: 0000000000000006
[ C6] x23: ffff000edf5dfad4 x22: 0000000000000000 x21: 0000000000000006
[ C6] x20: ffff0007ffffafc0 x19: 0000000000000000 x18: 0000000000000000
[ C6] x17: ffff8000805544b8 x16: ffff800080553d94 x15: ffff8000805c11b0
[ C6] x14: ffff8000805baeb0 x13: ffff800080047e10 x12: ffff6000fffff5f9
[ C6] x11: 1fffe000fffff5f8 x10: ffff6000fffff5f8 x9 : 1fffe000fffff5f8
[ C6] x8 : dfff800000000000 x7 : 00000000f2000000 x6 : dfff800000000000
[ C6] x5 : 00000000f2f2f200 x4 : dfff800000000000 x3 : ffff700011fcce98
[ C6] x2 : 0000000000000001 x1 : cf09d5450e2b4f7f x0 : 0000000000009a21
[ C6] Call trace:
[ C6] _raw_spin_unlock_irqrestore+0x50/0xb8
[ C6] free_pcppages_bulk+0x2bc/0x3e0
[ C6] free_unref_page_commit+0x1fc/0x290
[ C6] free_unref_page+0x184/0x250
[ C6] __free_pages+0x154/0x1a0
[ C6] free_pages+0x88/0xb0
[ C6] kasan_depopulate_vmalloc_pte+0x58/0x80
[ C6] __apply_to_page_range+0x3ec/0x650
[ C6] apply_to_existing_page_range+0x1c/0x30
[ C6] kasan_release_vmalloc+0xa4/0x118
[ C6] __purge_vmap_area_lazy+0x4f4/0xe30
[ C6] drain_vmap_area_work+0x60/0xc0
[ C6] process_one_work+0x4cc/0xa38
[ C6] worker_thread+0x240/0x638
[ C6] kthread+0x1c8/0x1e0
[ C6] ret_from_fork+0x10/0x20
Kefeng Wang (3):
mm: kasan: shadow: add cond_resched() in kasan_populate_vmalloc_pte()
mm: kasan: shadow: move free_page() out of page table lock
mm: kasan: shadow: HACK add cond_resched_lock() in
kasan_depopulate_vmalloc_pte()
include/linux/kasan.h | 9 ++++++---
mm/kasan/shadow.c | 20 +++++++++++++-------
mm/vmalloc.c | 7 ++++---
3 files changed, 23 insertions(+), 13 deletions(-)
