[syzbot ci] Re: Implement a new generic pagewalk API

[syzbot ci <syzbot+cic0b10fee257fdf9e@syzkaller.appspotmail.com>]

syzbot ci has tested the following series

[v2] Implement a new generic pagewalk API
https://lore.kernel.org/all/20260426125719.24698-1-osalvador@suse.de
* [RFC PATCH v2 1/7] mm: Add softleaf_from_pud
* [RFC PATCH v2 2/7] mm: Add {pmd,pud}_huge_lock helper
* [RFC PATCH v2 3/7] mm: Implement folio_pmd_batch
* [RFC PATCH v2 4/7] mm: Implement pt_range_walk
* [RFC PATCH v2 5/7] mm: Make /proc/pid/smaps use the new generic pagewalk API
* [RFC PATCH v2 6/7] mm: Make /proc/pid/numa_maps use the new generic pagewalk API
* [RFC PATCH v2 7/7] mm: Make /proc/pid/pagemap use the new generic pagewalk API

and found the following issues:
* KASAN: slab-out-of-bounds Write in pagemap_read
* WARNING in __page_table_check_pmds_set
* WARNING in pt_range_walk
* WARNING: bad unlock balance in pt_range_walk

Full report is available here:
https://ci.syzbot.org/series/409219de-ca42-45a5-9204-0b315095160c

***

KASAN: slab-out-of-bounds Write in pagemap_read

tree:      mm-new
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git
base:      819bd270abf9de3b7f306e233054b85a07c47820
arch:      amd64
compiler:  Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config:    https://ci.syzbot.org/builds/0361816f-57b2-43e4-aef2-186d8d35fdc9/config
syz repro: https://ci.syzbot.org/findings/7f740037-7398-46f2-aa01-a57caa186d06/syz_repro

==================================================================
BUG: KASAN: slab-out-of-bounds in add_to_pagemap fs/proc/task_mmu.c:1776 [inline]
BUG: KASAN: slab-out-of-bounds in pagemap_read_walk_range fs/proc/task_mmu.c:2949 [inline]
BUG: KASAN: slab-out-of-bounds in pagemap_read+0x1d60/0x2810 fs/proc/task_mmu.c:3092
Write of size 8 at addr ffff88816f1bd000 by task syz.1.18/5957

CPU: 1 UID: 0 PID: 5957 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 add_to_pagemap fs/proc/task_mmu.c:1776 [inline]
 pagemap_read_walk_range fs/proc/task_mmu.c:2949 [inline]
 pagemap_read+0x1d60/0x2810 fs/proc/task_mmu.c:3092
 vfs_read+0x20c/0xa70 fs/read_write.c:572
 ksys_pread64 fs/read_write.c:765 [inline]
 __do_sys_pread64 fs/read_write.c:773 [inline]
 __se_sys_pread64 fs/read_write.c:770 [inline]
 __x64_sys_pread64+0x199/0x230 fs/read_write.c:770
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f340679cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f34075d2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
RAX: ffffffffffffffda RBX: 00007f3406a15fa0 RCX: 00007f340679cdd9
RDX: 0000000000019020 RSI: 0000200000000200 RDI: 0000000000000003
RBP: 00007f3406832d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000001000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3406a16038 R14: 00007f3406a15fa0 R15: 00007ffdb721f7e8
 </TASK>

Allocated by task 5957:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5339
 kmalloc_noprof include/linux/slab.h:962 [inline]
 kmalloc_array_noprof include/linux/slab.h:1109 [inline]
 pagemap_read+0x27d/0x2810 fs/proc/task_mmu.c:3033
 vfs_read+0x20c/0xa70 fs/read_write.c:572
 ksys_pread64 fs/read_write.c:765 [inline]
 __do_sys_pread64 fs/read_write.c:773 [inline]
 __se_sys_pread64 fs/read_write.c:770 [inline]
 __x64_sys_pread64+0x199/0x230 fs/read_write.c:770
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88816f1bc000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 0 bytes to the right of
 allocated 4096-byte region [ffff88816f1bc000, ffff88816f1bd000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88816f1b8000 pfn:0x16f1b8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000240 ffff888100042140 ffff888160400a08 ffffea0005c6fe10
raw: ffff88816f1b8000 0000000000040003 00000000f5000000 0000000000000000
head: 057ff00000000240 ffff888100042140 ffff888160400a08 ffffea0005c6fe10
head: ffff88816f1b8000 0000000000040003 00000000f5000000 0000000000000000
head: 057ff00000000003 ffffea0005bc6e01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5715, tgid 5715 (rm), ts 50636400155, free_ts 46909302793
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
 prep_new_page mm/page_alloc.c:1897 [inline]
 get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
 alloc_slab_page mm/slub.c:3255 [inline]
 allocate_slab+0x77/0x660 mm/slub.c:3444
 new_slab mm/slub.c:3502 [inline]
 refill_objects+0x331/0x3c0 mm/slub.c:7134
 refill_sheaf mm/slub.c:2804 [inline]
 __pcs_replace_empty_main+0x2b9/0x620 mm/slub.c:4578
 alloc_from_pcs mm/slub.c:4681 [inline]
 slab_alloc_node mm/slub.c:4815 [inline]
 __do_kmalloc_node mm/slub.c:5218 [inline]
 __kmalloc_noprof+0x474/0x760 mm/slub.c:5231
 kmalloc_noprof include/linux/slab.h:966 [inline]
 tomoyo_realpath_from_path+0xe3/0x5d0 security/tomoyo/realpath.c:251
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x283/0x560 security/tomoyo/file.c:827
 tomoyo_path_unlink+0xaa/0xf0 security/tomoyo/tomoyo.c:162
 security_path_unlink+0x15f/0x330 security/security.c:1457
 filename_unlinkat+0x349/0x610 fs/namei.c:5537
 __do_sys_unlink fs/namei.c:5575 [inline]
 __se_sys_unlink+0x2e/0x140 fs/namei.c:5572
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5257 tgid 5257 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1433 [inline]
 __free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978
 __slab_free+0x263/0x2b0 mm/slub.c:5532
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4501 [inline]
 slab_alloc_node mm/slub.c:4830 [inline]
 kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4837
 alloc_filename fs/namei.c:142 [inline]
 do_getname+0x2e/0x250 fs/namei.c:182
 getname_flags fs/namei.c:225 [inline]
 getname include/linux/fs.h:2512 [inline]
 class_filename_constructor include/linux/fs.h:2539 [inline]
 __do_sys_unlink fs/namei.c:5574 [inline]
 __se_sys_unlink+0x1e/0x140 fs/namei.c:5572
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88816f1bcf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88816f1bcf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88816f1bd000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88816f1bd080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88816f1bd100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


***

WARNING in __page_table_check_pmds_set

tree:      mm-new
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git
base:      819bd270abf9de3b7f306e233054b85a07c47820
arch:      amd64
compiler:  Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config:    https://ci.syzbot.org/builds/0361816f-57b2-43e4-aef2-186d8d35fdc9/config
syz repro: https://ci.syzbot.org/findings/f8fe52b4-cef7-4d25-8e60-cbbb1a4f4df5/syz_repro

------------[ cut here ]------------
softleaf_cached_writable(entry)
WARNING: mm/page_table_check.c:227 at page_table_check_pmd_flags mm/page_table_check.c:227 [inline], CPU#1: syz.0.17/6022
WARNING: mm/page_table_check.c:227 at __page_table_check_pmds_set+0x18e/0x340 mm/page_table_check.c:240, CPU#1: syz.0.17/6022
Modules linked in:
CPU: 1 UID: 0 PID: 6022 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:page_table_check_pmd_flags mm/page_table_check.c:227 [inline]
RIP: 0010:__page_table_check_pmds_set+0x18e/0x340 mm/page_table_check.c:240
Code: 89 fe e8 85 44 89 ff 48 b8 00 00 00 00 00 00 00 94 4c 01 f8 48 c1 e8 3b 0f 94 c0 4d 39 e5 76 0f 84 c0 74 0b e8 83 3f 89 ff 90 <0f> 0b 90 eb 05 e8 78 3f 89 ff 31 ff 89 ee e8 af 43 89 ff 41 89 ef
RSP: 0018:ffffc90003ce7af8 EFLAGS: 00010293
RAX: ffffffff823c4d7d RBX: ffff888111416001 RCX: ffff88816cbd1d00
RDX: 0000000000000000 RSI: 6c00000000000000 RDI: 6c00000000000000
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000003
R10: 0000000000000002 R11: 0000000000000000 R12: c7fffffffffffffe
R13: dfffffffdc9bfe06 R14: ffff888111416008 R15: 6c00000000000000
FS:  00007ff0386af6c0(0000) GS:ffff8882a9466000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555574a1a9e8 CR3: 00000001063c6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 page_table_check_pmds_set include/linux/page_table_check.h:92 [inline]
 set_pmd_at arch/x86/include/asm/pgtable.h:1234 [inline]
 make_uffd_wp_pmd fs/proc/task_mmu.c:1903 [inline]
 pagemap_scan_walk fs/proc/task_mmu.c:2631 [inline]
 do_pagemap_scan fs/proc/task_mmu.c:2785 [inline]
 do_pagemap_cmd+0x3bd8/0x4310 fs/proc/task_mmu.c:3131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff03779cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff0386af028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff037a16090 RCX: 00007ff03779cdd9
RDX: 00002000000001c0 RSI: 00000000c0606610 RDI: 0000000000000003
RBP: 00007ff037832d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff037a16128 R14: 00007ff037a16090 R15: 00007ffd47ec5488
 </TASK>


***

WARNING in pt_range_walk

tree:      mm-new
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git
base:      819bd270abf9de3b7f306e233054b85a07c47820
arch:      amd64
compiler:  Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config:    https://ci.syzbot.org/builds/0361816f-57b2-43e4-aef2-186d8d35fdc9/config
syz repro: https://ci.syzbot.org/findings/02bfe437-a81f-4510-9fff-4b769eb9a0a4/syz_repro

------------[ cut here ]------------
next_addr < vma->vm_start || next_addr >= vma->vm_end
WARNING: mm/pagewalk.c:1052 at pt_range_walk+0x14e/0x35a0 mm/pagewalk.c:1052, CPU#1: syz.2.19/6013
Modules linked in:
CPU: 1 UID: 0 PID: 6013 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:pt_range_walk+0x14e/0x35a0 mm/pagewalk.c:1052
Code: 74 08 48 89 df e8 12 1a 15 00 49 89 de 48 8b 1b 48 8b 7c 24 10 48 89 de e8 6f a5 aa ff 48 39 5c 24 10 73 13 e8 03 a3 aa ff 90 <0f> 0b 90 b8 01 00 00 00 e9 88 2b 00 00 49 8d 5e 08 48 89 d8 48 c1
RSP: 0018:ffffc90003d37920 EFLAGS: 00010293
RAX: ffffffff821b11f0 RBX: 0000200000800000 RCX: ffff8881134f5700
RDX: 0000000000000000 RSI: 0000200000800000 RDI: 0000200000800000
RBP: ffffc90003d37b30 R08: 00000000000000ff R09: 1ffff1102dc8b830
R10: dffffc0000000000 R11: ffffed102dc8b831 R12: ffff8881709b1800
R13: dffffc0000000000 R14: ffff8881709b1800 R15: 0000200000800000
FS:  00007f33141ff6c0(0000) GS:ffff8882a9466000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f331344f0d1 CR3: 000000017150e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 pagemap_scan_walk fs/proc/task_mmu.c:2463 [inline]
 do_pagemap_scan fs/proc/task_mmu.c:2785 [inline]
 do_pagemap_cmd+0x3924/0x4310 fs/proc/task_mmu.c:3131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f331339cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f33141ff028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3313615fa0 RCX: 00007f331339cdd9
RDX: 0000200000000140 RSI: 00000000c0606610 RDI: 0000000000000003
RBP: 00007f3313432d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3313616038 R14: 00007f3313615fa0 R15: 00007fff980e14d8
 </TASK>


***

WARNING: bad unlock balance in pt_range_walk

tree:      mm-new
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git
base:      819bd270abf9de3b7f306e233054b85a07c47820
arch:      amd64
compiler:  Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config:    https://ci.syzbot.org/builds/0361816f-57b2-43e4-aef2-186d8d35fdc9/config
syz repro: https://ci.syzbot.org/findings/1e53935d-6673-468b-905d-88da8f1e39f3/syz_repro

loop1: detected capacity change from 0 to 4096
=====================================
WARNING: bad unlock balance detected!
syzkaller #0 Not tainted
-------------------------------------
syz.1.18/5968 is trying to release lock (ptlock_ptr(ptdesc)) at:
[<ffffffff821aeb0a>] spin_unlock include/linux/spinlock.h:389 [inline]
[<ffffffff821aeb0a>] pt_range_walk+0x25a/0x35a0 mm/pagewalk.c:1058
but there are no more locks to release!

other info that might help us debug this:
1 lock held by syz.1.18/5968:
 #0: ffff8881626b0340 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable include/linux/mmap_lock.h:601 [inline]
 #0: ffff8881626b0340 (&mm->mmap_lock){++++}-{4:4}, at: do_pagemap_scan fs/proc/task_mmu.c:2746 [inline]
 #0: ffff8881626b0340 (&mm->mmap_lock){++++}-{4:4}, at: do_pagemap_cmd+0x618/0x4310 fs/proc/task_mmu.c:3131

stack backtrace:
CPU: 1 UID: 0 PID: 5968 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_unlock_imbalance_bug+0xdc/0xf0 kernel/locking/lockdep.c:5298
 __lock_release kernel/locking/lockdep.c:5537 [inline]
 lock_release+0x248/0x3d0 kernel/locking/lockdep.c:5889
 __raw_spin_unlock include/linux/spinlock_api_smp.h:167 [inline]
 _raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:389 [inline]
 pt_range_walk+0x25a/0x35a0 mm/pagewalk.c:1058
 pagemap_scan_walk fs/proc/task_mmu.c:2463 [inline]
 do_pagemap_scan fs/proc/task_mmu.c:2785 [inline]
 do_pagemap_cmd+0x3924/0x4310 fs/proc/task_mmu.c:3131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0ce439cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0ce5214028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0ce4615fa0 RCX: 00007f0ce439cdd9
RDX: 0000200000000140 RSI: 00000000c0606610 RDI: 0000000000000004
RBP: 00007f0ce4432d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0ce4616038 R14: 00007f0ce4615fa0 R15: 00007fffbeb73768
 </TASK>


***

If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
  Tested-by: syzbot@syzkaller.appspotmail.com

---
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