* Re: [syzbot] [virtualization?] KMSAN: uninit-value in virtqueue_add (4)
[not found] <000000000000fd588e060de27ef4@google.com>
@ 2024-01-02 7:38 ` Tetsuo Handa
2024-02-21 11:04 ` Tetsuo Handa
0 siblings, 1 reply; 2+ messages in thread
From: Tetsuo Handa @ 2024-01-02 7:38 UTC (permalink / raw)
To: syzbot, syzkaller-bugs, linux-mm
#syz set subsystems: mm
On 2024/01/01 22:38, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: fbafc3e621c3 Merge tag 'for_linus' of git://git.kernel.org..
> git tree: upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=173df3e9e80000
> kernel config: https://syzkaller.appspot.com/x/.config?x=e0c7078a6b901aa3
> dashboard link: https://syzkaller.appspot.com/bug?extid=d7521c1e3841ed075a42
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1300b4a1e80000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=130b0379e80000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/1520f7b6daa4/disk-fbafc3e6.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/8b490af009d5/vmlinux-fbafc3e6.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/202ca200f4a4/bzImage-fbafc3e6.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+d7521c1e3841ed075a42@syzkaller.appspotmail.com
>
> =====================================================
> BUG: KMSAN: uninit-value in vring_map_one_sg drivers/virtio/virtio_ring.c:380 [inline]
> BUG: KMSAN: uninit-value in virtqueue_add_split drivers/virtio/virtio_ring.c:614 [inline]
> BUG: KMSAN: uninit-value in virtqueue_add+0x21c6/0x6530 drivers/virtio/virtio_ring.c:2210
> vring_map_one_sg drivers/virtio/virtio_ring.c:380 [inline]
> virtqueue_add_split drivers/virtio/virtio_ring.c:614 [inline]
> virtqueue_add+0x21c6/0x6530 drivers/virtio/virtio_ring.c:2210
> virtqueue_add_sgs+0x186/0x1a0 drivers/virtio/virtio_ring.c:2244
> __virtscsi_add_cmd drivers/scsi/virtio_scsi.c:467 [inline]
> virtscsi_add_cmd+0x838/0xad0 drivers/scsi/virtio_scsi.c:501
> virtscsi_queuecommand+0x896/0xa60 drivers/scsi/virtio_scsi.c:598
> scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1516 [inline]
> scsi_queue_rq+0x4874/0x5790 drivers/scsi/scsi_lib.c:1758
> blk_mq_dispatch_rq_list+0x13f8/0x3600 block/blk-mq.c:2049
> __blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline]
> blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline]
> __blk_mq_sched_dispatch_requests+0x10af/0x2500 block/blk-mq-sched.c:309
> blk_mq_sched_dispatch_requests+0x160/0x2d0 block/blk-mq-sched.c:333
> blk_mq_run_work_fn+0xd0/0x280 block/blk-mq.c:2434
> process_one_work kernel/workqueue.c:2627 [inline]
> process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2700
> worker_thread+0xf45/0x1490 kernel/workqueue.c:2781
> kthread+0x3ed/0x540 kernel/kthread.c:388
> ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
>
> Uninit was created at:
> __alloc_pages+0x9a4/0xe00 mm/page_alloc.c:4591
> alloc_pages_mpol+0x62b/0x9d0 mm/mempolicy.c:2133
> alloc_pages mm/mempolicy.c:2204 [inline]
> folio_alloc+0x1da/0x380 mm/mempolicy.c:2211
> filemap_alloc_folio+0xa5/0x430 mm/filemap.c:974
> __filemap_get_folio+0xa5a/0x1760 mm/filemap.c:1918
> ext4_da_write_begin+0x7f8/0xec0 fs/ext4/inode.c:2891
> generic_perform_write+0x3f5/0xc40 mm/filemap.c:3918
> ext4_buffered_write_iter+0x564/0xaa0 fs/ext4/file.c:299
> ext4_file_write_iter+0x20f/0x3460
> __kernel_write_iter+0x329/0x930 fs/read_write.c:517
> dump_emit_page fs/coredump.c:888 [inline]
> dump_user_range+0x593/0xcd0 fs/coredump.c:915
> elf_core_dump+0x528d/0x5a40 fs/binfmt_elf.c:2077
> do_coredump+0x32c9/0x4920 fs/coredump.c:764
> get_signal+0x2185/0x2d10 kernel/signal.c:2890
> arch_do_signal_or_restart+0x53/0xca0 arch/x86/kernel/signal.c:309
> exit_to_user_mode_loop+0xe8/0x320 kernel/entry/common.c:168
> exit_to_user_mode_prepare+0x163/0x220 kernel/entry/common.c:204
> irqentry_exit_to_user_mode+0xd/0x30 kernel/entry/common.c:309
> irqentry_exit+0x16/0x40 kernel/entry/common.c:412
> exc_page_fault+0x246/0x6f0 arch/x86/mm/fault.c:1564
> asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:570
>
> Bytes 0-4095 of 4096 are uninitialized
> Memory access of size 4096 starts at ffff88812c79c000
>
> CPU: 0 PID: 997 Comm: kworker/0:1H Not tainted 6.7.0-rc7-syzkaller-00003-gfbafc3e621c3 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
> Workqueue: kblockd blk_mq_run_work_fn
> =====================================================
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [syzbot] [virtualization?] KMSAN: uninit-value in virtqueue_add (4)
2024-01-02 7:38 ` [syzbot] [virtualization?] KMSAN: uninit-value in virtqueue_add (4) Tetsuo Handa
@ 2024-02-21 11:04 ` Tetsuo Handa
0 siblings, 0 replies; 2+ messages in thread
From: Tetsuo Handa @ 2024-02-21 11:04 UTC (permalink / raw)
To: kasan-dev, syzbot, syzkaller-bugs, Alexander Potapenko; +Cc: linux-mm
I tried to reproduce this problem in my environment, and I found that
just consuming almost all memory trivially generates below one.
This might be the same cause?
$ ./scripts/faddr2line vmlinux free_unref_page_prepare+0x130/0xfc0
free_unref_page_prepare+0x130/0xfc0:
arch_static_branch_jump at arch/x86/include/asm/jump_label.h:55
(inlined by) memcg_kmem_online at include/linux/memcontrol.h:1840
(inlined by) free_pages_prepare at mm/page_alloc.c:1096
(inlined by) free_unref_page_prepare at mm/page_alloc.c:2346
----------------------------------------
[ 0.000000][ T0] Linux version 6.8.0-rc5 (root@ubuntu) (Ubuntu clang version 14.0.0-1ubuntu1.1, Ubuntu LLD 14.0.0) #1089 SMP PREEMPT_DYNAMIC Tue Feb 20 22:50:10 UTC 2024
[ 76.193709][ T2962] =====================================================
[ 76.221751][ T2962] BUG: KMSAN: use-after-free in obj_malloc+0x6cc/0x7b0
[ 76.229392][ T2962] obj_malloc+0x6cc/0x7b0
[ 76.234874][ T2962] zs_malloc+0xdbd/0x1400
[ 76.239897][ T2962] zs_zpool_malloc+0xa5/0x1b0
[ 76.248589][ T2962] zpool_malloc+0x110/0x150
[ 76.261388][ T2962] zswap_store+0x2bbb/0x3d30
[ 76.286128][ T2962] swap_writepage+0x15b/0x4f0
[ 76.305337][ T2962] pageout+0x41d/0xef0
[ 76.329597][ T2962] shrink_folio_list+0x4d7a/0x7480
[ 76.352303][ T2962] evict_folios+0x30f1/0x5170
[ 76.375539][ T2962] try_to_shrink_lruvec+0x983/0xd20
[ 76.397057][ T2962] shrink_one+0x72d/0xeb0
[ 76.405789][ T2962] shrink_many+0x70d/0x10b0
[ 76.413973][ T2962] lru_gen_shrink_node+0x577/0x850
[ 76.424001][ T2962] shrink_node+0x13d/0x1de0
[ 76.432440][ T2962] shrink_zones+0x878/0x14a0
[ 76.441432][ T2962] do_try_to_free_pages+0x2ac/0x16a0
[ 76.453092][ T2962] try_to_free_pages+0xd9e/0x1910
[ 76.469480][ T2962] __alloc_pages_slowpath+0x147a/0x2bd0
[ 76.494976][ T2962] __alloc_pages+0xb8c/0x1050
[ 76.521081][ T2962] alloc_pages_mpol+0x8e0/0xc80
[ 76.544806][ T2962] alloc_pages+0x224/0x240
[ 76.558044][ T2962] pipe_write+0xabe/0x2ba0
[ 76.582897][ T2962] vfs_write+0xfb0/0x1b80
[ 76.604669][ T2962] ksys_write+0x275/0x500
[ 76.613269][ T2962] __x64_sys_write+0xdf/0x120
[ 76.622218][ T2962] do_syscall_64+0xd1/0x1b0
[ 76.629765][ T2962] entry_SYSCALL_64_after_hwframe+0x63/0x6b
[ 76.638984][ T2962]
[ 76.645171][ T2962] Uninit was stored to memory at:
[ 76.653234][ T2962] obj_malloc+0x70a/0x7b0
[ 76.660989][ T2962] zs_malloc+0xdbd/0x1400
[ 76.667451][ T2962] zs_zpool_malloc+0xa5/0x1b0
[ 76.674667][ T2962] zpool_malloc+0x110/0x150
[ 76.682273][ T2962] zswap_store+0x2bbb/0x3d30
[ 76.688772][ T2962] swap_writepage+0x15b/0x4f0
[ 76.695427][ T2962] pageout+0x41d/0xef0
[ 76.701864][ T2962] shrink_folio_list+0x4d7a/0x7480
[ 76.708623][ T2962] evict_folios+0x30f1/0x5170
[ 76.715962][ T2962] try_to_shrink_lruvec+0x983/0xd20
[ 76.723092][ T2962] shrink_one+0x72d/0xeb0
[ 76.730491][ T2962] shrink_many+0x70d/0x10b0
[ 76.736930][ T2962] lru_gen_shrink_node+0x577/0x850
[ 76.743338][ T2962] shrink_node+0x13d/0x1de0
[ 76.749527][ T2962] shrink_zones+0x878/0x14a0
[ 76.757753][ T2962] do_try_to_free_pages+0x2ac/0x16a0
[ 76.784738][ T2962] try_to_free_pages+0xd9e/0x1910
[ 76.794060][ T2962] __alloc_pages_slowpath+0x147a/0x2bd0
[ 76.809193][ T2962] __alloc_pages+0xb8c/0x1050
[ 76.819106][ T2962] alloc_pages_mpol+0x8e0/0xc80
[ 76.825845][ T2962] alloc_pages+0x224/0x240
[ 76.833084][ T2962] pipe_write+0xabe/0x2ba0
[ 76.839441][ T2962] vfs_write+0xfb0/0x1b80
[ 76.846688][ T2962] ksys_write+0x275/0x500
[ 76.861721][ T2962] __x64_sys_write+0xdf/0x120
[ 76.887481][ T2962] do_syscall_64+0xd1/0x1b0
[ 76.912683][ T2962] entry_SYSCALL_64_after_hwframe+0x63/0x6b
[ 76.941992][ T2962]
[ 76.960534][ T2962] Uninit was created at:
[ 76.967351][ T2962] free_unref_page_prepare+0x130/0xfc0
[ 76.974685][ T2962] free_unref_page_list+0x139/0x1050
[ 76.980910][ T2962] shrink_folio_list+0x7139/0x7480
[ 76.987899][ T2962] evict_folios+0x30f1/0x5170
[ 76.994206][ T2962] try_to_shrink_lruvec+0x983/0xd20
[ 77.000665][ T2962] shrink_one+0x72d/0xeb0
[ 77.007039][ T2962] shrink_many+0x70d/0x10b0
[ 77.013652][ T2962] lru_gen_shrink_node+0x577/0x850
[ 77.024303][ T2962] shrink_node+0x13d/0x1de0
[ 77.050110][ T2962] shrink_zones+0x878/0x14a0
[ 77.075727][ T2962] do_try_to_free_pages+0x2ac/0x16a0
[ 77.100888][ T2962] try_to_free_pages+0xd9e/0x1910
[ 77.106076][ T2962] __alloc_pages_slowpath+0x147a/0x2bd0
[ 77.111944][ T2962] __alloc_pages+0xb8c/0x1050
[ 77.117585][ T2962] alloc_pages_mpol+0x8e0/0xc80
[ 77.124268][ T2962] alloc_pages+0x224/0x240
[ 77.130464][ T2962] pipe_write+0xabe/0x2ba0
[ 77.136968][ T2962] vfs_write+0xfb0/0x1b80
[ 77.143088][ T2962] ksys_write+0x275/0x500
[ 77.168816][ T2962] __x64_sys_write+0xdf/0x120
[ 77.193213][ T2962] do_syscall_64+0xd1/0x1b0
[ 77.217003][ T2962] entry_SYSCALL_64_after_hwframe+0x63/0x6b
[ 77.245384][ T2962]
[ 77.271236][ T2962] CPU: 2 PID: 2962 Comm: a.out Not tainted 6.8.0-rc5 #1089
[ 77.287165][ T2962] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[ 77.300986][ T2962] =====================================================
[ 77.309323][ T2962] Disabling lock debugging due to kernel taint
[ 77.317501][ T2962] Kernel panic - not syncing: kmsan.panic set ...
[ 77.328533][ T2962] CPU: 2 PID: 2962 Comm: a.out Tainted: G B 6.8.0-rc5 #1089
[ 77.384024][ T2962] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[ 77.432726][ T2962] Call Trace:
[ 77.454709][ T2962] <TASK>
[ 77.480712][ T2962] dump_stack_lvl+0x1f6/0x280
[ 77.510291][ T2962] dump_stack+0x29/0x30
[ 77.538912][ T2962] panic+0x4ed/0xc90
[ 77.565356][ T2962] kmsan_report+0x2d1/0x2e0
[ 77.593241][ T2962] ? kmsan_internal_poison_memory+0x49/0x90
[ 77.625512][ T2962] ? kmsan_internal_poison_memory+0x7d/0x90
[ 77.653002][ T2962] ? __msan_warning+0x98/0x120
[ 77.662635][ T2962] ? obj_malloc+0x6cc/0x7b0
[ 77.669636][ T2962] ? zs_malloc+0xdbd/0x1400
[ 77.677036][ T2962] ? zs_zpool_malloc+0xa5/0x1b0
[ 77.693619][ T2962] ? zpool_malloc+0x110/0x150
[ 77.724160][ T2962] ? zswap_store+0x2bbb/0x3d30
[ 77.736985][ T2962] ? swap_writepage+0x15b/0x4f0
[ 77.744190][ T2962] ? pageout+0x41d/0xef0
[ 77.750941][ T2962] ? shrink_folio_list+0x4d7a/0x7480
[ 77.758465][ T2962] ? evict_folios+0x30f1/0x5170
[ 77.768334][ T2962] ? try_to_shrink_lruvec+0x983/0xd20
[ 77.789768][ T2962] ? shrink_one+0x72d/0xeb0
[ 77.803770][ T2962] ? shrink_many+0x70d/0x10b0
[ 77.823518][ T2962] ? lru_gen_shrink_node+0x577/0x850
[ 77.831064][ T2962] ? shrink_node+0x13d/0x1de0
[ 77.838508][ T2962] ? shrink_zones+0x878/0x14a0
[ 77.853087][ T2962] ? do_try_to_free_pages+0x2ac/0x16a0
[ 77.870947][ T2962] ? try_to_free_pages+0xd9e/0x1910
[ 77.898331][ T2962] ? __alloc_pages_slowpath+0x147a/0x2bd0
[ 77.927623][ T2962] ? __alloc_pages+0xb8c/0x1050
[ 77.954001][ T2962] ? alloc_pages_mpol+0x8e0/0xc80
[ 77.977357][ T2962] ? alloc_pages+0x224/0x240
[ 77.999681][ T2962] ? pipe_write+0xabe/0x2ba0
[ 78.014454][ T2962] ? vfs_write+0xfb0/0x1b80
[ 78.023741][ T2962] ? ksys_write+0x275/0x500
[ 78.031807][ T2962] ? __x64_sys_write+0xdf/0x120
[ 78.040331][ T2962] ? do_syscall_64+0xd1/0x1b0
[ 78.047608][ T2962] ? entry_SYSCALL_64_after_hwframe+0x63/0x6b
[ 78.055721][ T2962] ? entry_SYSCALL_64_after_hwframe+0x63/0x6b
[ 78.072687][ T2962] ? __msan_metadata_ptr_for_load_8+0x24/0x40
[ 78.081809][ T2962] ? filter_irq_stacks+0xb9/0x230
[ 78.087869][ T2962] ? filter_irq_stacks+0xb9/0x230
[ 78.095051][ T2962] ? should_fail_ex+0x91/0xa20
[ 78.101839][ T2962] ? kmsan_get_metadata+0x146/0x1c0
[ 78.107538][ T2962] ? kmsan_get_metadata+0x146/0x1c0
[ 78.114253][ T2962] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 78.122152][ T2962] ? __should_failslab+0x24f/0x2e0
[ 78.129024][ T2962] ? __msan_metadata_ptr_for_load_8+0x24/0x40
[ 78.136577][ T2962] ? __should_failslab+0x24f/0x2e0
[ 78.156694][ T2962] ? kmsan_get_metadata+0x146/0x1c0
[ 78.162925][ T2962] ? kmsan_get_metadata+0x146/0x1c0
[ 78.169811][ T2962] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 78.177276][ T2962] __msan_warning+0x98/0x120
[ 78.183309][ T2962] obj_malloc+0x6cc/0x7b0
[ 78.188246][ T2962] ? kmsan_get_metadata+0x146/0x1c0
[ 78.193961][ T2962] zs_malloc+0xdbd/0x1400
[ 78.198774][ T2962] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 78.204373][ T2962] zs_zpool_malloc+0xa5/0x1b0
[ 78.209487][ T2962] ? zs_zpool_destroy+0x50/0x50
[ 78.215875][ T2962] zpool_malloc+0x110/0x150
[ 78.221423][ T2962] zswap_store+0x2bbb/0x3d30
[ 78.226784][ T2962] swap_writepage+0x15b/0x4f0
[ 78.232645][ T2962] ? generic_swapfile_activate+0xee0/0xee0
[ 78.238777][ T2962] pageout+0x41d/0xef0
[ 78.244187][ T2962] shrink_folio_list+0x4d7a/0x7480
[ 78.250349][ T2962] evict_folios+0x30f1/0x5170
[ 78.256857][ T2962] try_to_shrink_lruvec+0x983/0xd20
[ 78.263215][ T2962] shrink_one+0x72d/0xeb0
[ 78.268410][ T2962] shrink_many+0x70d/0x10b0
[ 78.274632][ T2962] lru_gen_shrink_node+0x577/0x850
[ 78.281485][ T2962] shrink_node+0x13d/0x1de0
[ 78.287756][ T2962] ? mem_cgroup_soft_limit_reclaim+0x34/0x17a0
[ 78.295195][ T2962] ? filter_irq_stacks+0xb9/0x230
[ 78.301832][ T2962] ? stack_depot_save_flags+0x2c/0x810
[ 78.308677][ T2962] ? kmsan_internal_set_shadow_origin+0x66/0xe0
[ 78.315638][ T2962] ? kmsan_get_metadata+0x146/0x1c0
[ 78.321575][ T2962] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 78.328726][ T2962] shrink_zones+0x878/0x14a0
[ 78.335109][ T2962] ? __module_address+0x114/0x890
[ 78.341766][ T2962] do_try_to_free_pages+0x2ac/0x16a0
[ 78.348484][ T2962] ? kmsan_get_metadata+0x146/0x1c0
[ 78.357673][ T2962] try_to_free_pages+0xd9e/0x1910
[ 78.382022][ T2962] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 78.409072][ T2962] __alloc_pages_slowpath+0x147a/0x2bd0
[ 78.435039][ T2962] ? get_page_from_freelist+0x11ed/0x1b00
[ 78.461720][ T2962] __alloc_pages+0xb8c/0x1050
[ 78.474860][ T2962] alloc_pages_mpol+0x8e0/0xc80
[ 78.481368][ T2962] alloc_pages+0x224/0x240
[ 78.487579][ T2962] pipe_write+0xabe/0x2ba0
[ 78.494006][ T2962] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0
[ 78.501316][ T2962] ? filter_irq_stacks+0x1d8/0x230
[ 78.508179][ T2962] ? kmsan_get_metadata+0x146/0x1c0
[ 78.515408][ T2962] ? pipe_read+0x2220/0x2220
[ 78.530652][ T2962] vfs_write+0xfb0/0x1b80
[ 78.553685][ T2962] ksys_write+0x275/0x500
[ 78.576529][ T2962] __x64_sys_write+0xdf/0x120
[ 78.599958][ T2962] do_syscall_64+0xd1/0x1b0
[ 78.623046][ T2962] ? irqentry_exit+0x16/0x50
[ 78.646375][ T2962] ? exc_page_fault+0x7c/0x180
[ 78.667298][ T2962] entry_SYSCALL_64_after_hwframe+0x63/0x6b
[ 78.693772][ T2962] RIP: 0033:0x7f24b1f14887
[ 78.712875][ T2962] Code: 10 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
[ 78.769621][ T2962] RSP: 002b:00007ffd348e7138 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 78.779659][ T2962] RAX: ffffffffffffffda RBX: 0000000000000089 RCX: 00007f24b1f14887
[ 78.788322][ T2962] RDX: 0000000000001000 RSI: 000055fd4849e040 RDI: 00000000000000ea
[ 78.799066][ T2962] RBP: 000055fd4849e040 R08: 0000000000000000 R09: 00007f24b2094740
[ 78.808645][ T2962] R10: 00007f24b20de0c8 R11: 0000000000000246 R12: 00007ffd348e7140
[ 78.819277][ T2962] R13: 000055fd4849b160 R14: 000055fd4849dd80 R15: 00007f24b20dd040
[ 78.828758][ T2962] </TASK>
[ 78.856768][ T2962] Kernel Offset: disabled
[ 78.861472][ T2962] Rebooting in 10 seconds..
----------------------------------------
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2024-01-02 7:38 ` [syzbot] [virtualization?] KMSAN: uninit-value in virtqueue_add (4) Tetsuo Handa
2024-02-21 11:04 ` Tetsuo Handa
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