[syzbot] [io-uring?] WARNING in __vmap_pages_range_noflush

[syzbot] [io-uring?] WARNING in __vmap_pages_range_noflush

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    6e64f4580381 Merge tag 'input-for-v6.17-rc0' of git://git...
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=166ceea2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5549e3e577d8650d
dashboard link: https://syzkaller.appspot.com/bug?extid=23727438116feb13df15
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10202ea2580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=140a9042580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/00c0275acc38/disk-6e64f458.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/aaa587e79838/vmlinux-6e64f458.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b6b49690ca26/bzImage-6e64f458.xz

The issue was bisected to:

commit 087f997870a948820ec366701d178f402c6a23a3
Author: Pavel Begunkov <asml.silence@gmail.com>
Date:   Fri Nov 29 13:34:32 2024 +0000

    io_uring/memmap: implement mmap for regions

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=169795bc580000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=159795bc580000
console output: https://syzkaller.appspot.com/x/log.txt?x=119795bc580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+23727438116feb13df15@syzkaller.appspotmail.com
Fixes: 087f997870a9 ("io_uring/memmap: implement mmap for regions")

------------[ cut here ]------------
WARNING: CPU: 1 PID: 5840 at mm/vmalloc.c:542 vmap_pages_pte_range mm/vmalloc.c:542 [inline]
WARNING: CPU: 1 PID: 5840 at mm/vmalloc.c:542 vmap_pages_pmd_range mm/vmalloc.c:569 [inline]
WARNING: CPU: 1 PID: 5840 at mm/vmalloc.c:542 vmap_pages_pud_range mm/vmalloc.c:587 [inline]
WARNING: CPU: 1 PID: 5840 at mm/vmalloc.c:542 vmap_pages_p4d_range mm/vmalloc.c:605 [inline]
WARNING: CPU: 1 PID: 5840 at mm/vmalloc.c:542 vmap_small_pages_range_noflush mm/vmalloc.c:627 [inline]
WARNING: CPU: 1 PID: 5840 at mm/vmalloc.c:542 __vmap_pages_range_noflush+0xd4e/0xe10 mm/vmalloc.c:656
Modules linked in:
CPU: 1 UID: 0 PID: 5840 Comm: syz-executor304 Tainted: G        W           6.16.0-syzkaller-11952-g6e64f4580381 #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:vmap_pages_pte_range mm/vmalloc.c:542 [inline]
RIP: 0010:vmap_pages_pmd_range mm/vmalloc.c:569 [inline]
RIP: 0010:vmap_pages_pud_range mm/vmalloc.c:587 [inline]
RIP: 0010:vmap_pages_p4d_range mm/vmalloc.c:605 [inline]
RIP: 0010:vmap_small_pages_range_noflush mm/vmalloc.c:627 [inline]
RIP: 0010:__vmap_pages_range_noflush+0xd4e/0xe10 mm/vmalloc.c:656
Code: b1 ff eb 2f e8 53 5f b1 ff 45 31 e4 eb 25 e8 49 5f b1 ff 90 0f 0b 90 eb 14 e8 3e 5f b1 ff 90 0f 0b 90 eb 09 e8 33 5f b1 ff 90 <0f> 0b 90 41 bc f4 ff ff ff 44 89 e0 48 81 c4 e0 00 00 00 5b 41 5c
RSP: 0018:ffffc900049878d8 EFLAGS: 00010293
RAX: ffffffff820cfc2d RBX: ffff8880642b60c8 RCX: ffff8880331c8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffea0003000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1e3a007 R12: ffffc9008be1a000
R13: 1ffff1100c856c19 R14: 0000000000000000 R15: dffffc0000000000
FS:  000055557fb73380(0000) GS:ffff8881269cb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005641a237d168 CR3: 000000004069e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 vmap_pages_range_noflush mm/vmalloc.c:681 [inline]
 vmap_pages_range mm/vmalloc.c:701 [inline]
 vmap+0x1ca/0x310 mm/vmalloc.c:3515
 io_region_init_ptr+0x24d/0x350 io_uring/memmap.c:125
 io_create_region+0x3a4/0x480 io_uring/memmap.c:228
 io_create_region_mmap_safe+0xc0/0x180 io_uring/memmap.c:245
 io_register_mem_region+0x27a/0x3c0 io_uring/register.c:616
 __io_uring_register io_uring/register.c:836 [inline]
 __do_sys_io_uring_register io_uring/register.c:929 [inline]
 __se_sys_io_uring_register+0x3b4/0x1130 io_uring/register.c:906
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f59fe9b6b39
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffffb26e418 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab
RAX: ffffffffffffffda RBX: 0000000000000045 RCX: 00007f59fe9b6b39
RDX: 0000200000000200 RSI: 0000000000000022 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000000010000000 R09: 0000000000000006
R10: 0000000000000001 R11: 0000000000000246 R12: 0000200000000300
R13: 0000200000000100 R14: 0000000000000001 R15: 0000000000000001
 </TASK>


---
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If you want syzbot to run the reproducer, reply with:
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#syz undup

Re: [syzbot] [io-uring?] WARNING in __vmap_pages_range_noflush

[Jens Axboe]

On 8/8/25 2:17 AM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    6e64f4580381 Merge tag 'input-for-v6.17-rc0' of git://git...
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=166ceea2580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=5549e3e577d8650d
> dashboard link: https://syzkaller.appspot.com/bug?extid=23727438116feb13df15
> compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10202ea2580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=140a9042580000

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git> 

diff --git a/io_uring/memmap.c b/io_uring/memmap.c
index 725dc0bec24c..2e99dffddfc5 100644
--- a/io_uring/memmap.c
+++ b/io_uring/memmap.c
@@ -156,7 +156,7 @@ static int io_region_allocate_pages(struct io_ring_ctx *ctx,
 				    unsigned long mmap_offset)
 {
 	gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO | __GFP_NOWARN;
-	unsigned long size = mr->nr_pages << PAGE_SHIFT;
+	size_t size = (size_t) mr->nr_pages << PAGE_SHIFT;
 	unsigned long nr_allocated;
 	struct page **pages;
 	void *p;

-- 
Jens Axboe

Re: [syzbot] [io-uring?] WARNING in __vmap_pages_range_noflush

[syzbot]

> On 8/8/25 2:17 AM, syzbot wrote:
>> Hello,
>> 
>> syzbot found the following issue on:
>> 
>> HEAD commit:    6e64f4580381 Merge tag 'input-for-v6.17-rc0' of git://git...
>> git tree:       upstream
>> console+strace: https://syzkaller.appspot.com/x/log.txt?x=166ceea2580000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=5549e3e577d8650d
>> dashboard link: https://syzkaller.appspot.com/bug?extid=23727438116feb13df15
>> compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10202ea2580000
>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=140a9042580000
>
> #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git> 

want either no args or 2 args (repo, branch), got 5

>
> diff --git a/io_uring/memmap.c b/io_uring/memmap.c
> index 725dc0bec24c..2e99dffddfc5 100644
> --- a/io_uring/memmap.c
> +++ b/io_uring/memmap.c
> @@ -156,7 +156,7 @@ static int io_region_allocate_pages(struct io_ring_ctx *ctx,
>  				    unsigned long mmap_offset)
>  {
>  	gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO | __GFP_NOWARN;
> -	unsigned long size = mr->nr_pages << PAGE_SHIFT;
> +	size_t size = (size_t) mr->nr_pages << PAGE_SHIFT;
>  	unsigned long nr_allocated;
>  	struct page **pages;
>  	void *p;
>
> -- 
> Jens Axboe

Re: [syzbot] [io-uring?] WARNING in __vmap_pages_range_noflush

[Jens Axboe]

On 8/8/25 6:34 AM, syzbot wrote:
>> On 8/8/25 2:17 AM, syzbot wrote:
>>> Hello,
>>>
>>> syzbot found the following issue on:
>>>
>>> HEAD commit:    6e64f4580381 Merge tag 'input-for-v6.17-rc0' of git://git...
>>> git tree:       upstream
>>> console+strace: https://syzkaller.appspot.com/x/log.txt?x=166ceea2580000
>>> kernel config:  https://syzkaller.appspot.com/x/.config?x=5549e3e577d8650d
>>> dashboard link: https://syzkaller.appspot.com/bug?extid=23727438116feb13df15
>>> compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
>>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10202ea2580000
>>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=140a9042580000
>>
>> #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git> 
> 
> want either no args or 2 args (repo, branch), got 5

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


diff --git a/io_uring/memmap.c b/io_uring/memmap.c
index 725dc0bec24c..2e99dffddfc5 100644
--- a/io_uring/memmap.c
+++ b/io_uring/memmap.c
@@ -156,7 +156,7 @@ static int io_region_allocate_pages(struct io_ring_ctx *ctx,
 				    unsigned long mmap_offset)
 {
 	gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO | __GFP_NOWARN;
-	unsigned long size = mr->nr_pages << PAGE_SHIFT;
+	size_t size = (size_t) mr->nr_pages << PAGE_SHIFT;
 	unsigned long nr_allocated;
 	struct page **pages;
 	void *p;

-- 
Jens Axboe

Re: [syzbot] [io-uring?] WARNING in __vmap_pages_range_noflush

[syzbot]

> On 8/8/25 6:34 AM, syzbot wrote:
>>> On 8/8/25 2:17 AM, syzbot wrote:
>>>> Hello,
>>>>
>>>> syzbot found the following issue on:
>>>>
>>>> HEAD commit:    6e64f4580381 Merge tag 'input-for-v6.17-rc0' of git://git...
>>>> git tree:       upstream
>>>> console+strace: https://syzkaller.appspot.com/x/log.txt?x=166ceea2580000
>>>> kernel config:  https://syzkaller.appspot.com/x/.config?x=5549e3e577d8650d
>>>> dashboard link: https://syzkaller.appspot.com/bug?extid=23727438116feb13df15
>>>> compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
>>>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10202ea2580000
>>>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=140a9042580000
>>>
>>> #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git> 
>> 
>> want either no args or 2 args (repo, branch), got 5
>
> #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

want either no args or 2 args (repo, branch), got 5

>
>
> diff --git a/io_uring/memmap.c b/io_uring/memmap.c
> index 725dc0bec24c..2e99dffddfc5 100644
> --- a/io_uring/memmap.c
> +++ b/io_uring/memmap.c
> @@ -156,7 +156,7 @@ static int io_region_allocate_pages(struct io_ring_ctx *ctx,
>  				    unsigned long mmap_offset)
>  {
>  	gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO | __GFP_NOWARN;
> -	unsigned long size = mr->nr_pages << PAGE_SHIFT;
> +	size_t size = (size_t) mr->nr_pages << PAGE_SHIFT;
>  	unsigned long nr_allocated;
>  	struct page **pages;
>  	void *p;
>
> -- 
> Jens Axboe

Re: [syzbot] [io-uring?] WARNING in __vmap_pages_range_noflush

[Jens Axboe]

On 8/8/25 6:38 AM, syzbot wrote:
>> On 8/8/25 6:34 AM, syzbot wrote:
>>>> On 8/8/25 2:17 AM, syzbot wrote:
>>>>> Hello,
>>>>>
>>>>> syzbot found the following issue on:
>>>>>
>>>>> HEAD commit:    6e64f4580381 Merge tag 'input-for-v6.17-rc0' of git://git...
>>>>> git tree:       upstream
>>>>> console+strace: https://syzkaller.appspot.com/x/log.txt?x=166ceea2580000
>>>>> kernel config:  https://syzkaller.appspot.com/x/.config?x=5549e3e577d8650d
>>>>> dashboard link: https://syzkaller.appspot.com/bug?extid=23727438116feb13df15
>>>>> compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
>>>>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10202ea2580000
>>>>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=140a9042580000
>>>>
>>>> #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git> 
>>>
>>> want either no args or 2 args (repo, branch), got 5
>>
>> #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> 
> want either no args or 2 args (repo, branch), got 5

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

diff --git a/io_uring/memmap.c b/io_uring/memmap.c
index 725dc0bec24c..2e99dffddfc5 100644
--- a/io_uring/memmap.c
+++ b/io_uring/memmap.c
@@ -156,7 +156,7 @@ static int io_region_allocate_pages(struct io_ring_ctx *ctx,
 				    unsigned long mmap_offset)
 {
 	gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO | __GFP_NOWARN;
-	unsigned long size = mr->nr_pages << PAGE_SHIFT;
+	size_t size = (size_t) mr->nr_pages << PAGE_SHIFT;
 	unsigned long nr_allocated;
 	struct page **pages;
 	void *p;

-- 
Jens Axboe

Re: [syzbot] [io-uring?] WARNING in __vmap_pages_range_noflush

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+23727438116feb13df15@syzkaller.appspotmail.com
Tested-by: syzbot+23727438116feb13df15@syzkaller.appspotmail.com

Tested on:

commit:         37816488 Merge tag 'net-6.17-rc1' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17ca61a2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=251464a47fe663c3
dashboard link: https://syzkaller.appspot.com/bug?extid=23727438116feb13df15
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
patch:          https://syzkaller.appspot.com/x/patch.diff?x=16e13ea2580000

Note: testing is done by a robot and is best-effort only.