[v6.6] WARNING in bitmap_parse_user

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: a1153c0deb44 Linux 6.6.147
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16188c9e580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f0bc3d90c30838b5
dashboard link: https://syzkaller.appspot.com/bug?extid=304ce94b7efa3a6313d4
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9f646bfa1b52/disk-a1153c0d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a2aec2e8f0fd/vmlinux-a1153c0d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a7abe1f87405/bzImage-a1153c0d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+304ce9...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 13961 at mm/page_alloc.c:4477 __alloc_pages+0x2e4/0x460 mm/page_alloc.c:4477
Modules linked in:
CPU: 0 PID: 13961 Comm: syz.0.2230 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__alloc_pages+0x2e4/0x460 mm/page_alloc.c:4477
Code: 0c 25 28 00 00 00 48 3b 8c 24 a0 00 00 00 0f 85 9f 00 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 c6 05 92 1b a3 0c 01 <0f> 0b eb a4 a9 00 00 08 00 8b 74 24 0c 75 3e 44 89 f1 81 e1 7f ff
RSP: 0018:ffffc9000d12fa20 EFLAGS: 00010246
RAX: ffffc9000d12fa00 RBX: 1ffff92001a25f48 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000d12fa88
RBP: ffffc9000d12fb10 R08: ffffc9000d12fa87 R09: 0000000000000000
R10: ffffc9000d12fa60 R11: fffff52001a25f51 R12: 0000000000000013
R13: 0000000000000000 R14: 0000000000040cc0 R15: dffffc0000000000
FS: 00007f1fa66ad6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3fdb87 CR3: 000000002c370000 CR4: 00000000003506f0
Call Trace:
<TASK>
__alloc_pages_node include/linux/gfp.h:237 [inline]
alloc_pages_node include/linux/gfp.h:260 [inline]
__kmalloc_large_node+0x8c/0x1f0 mm/slab_common.c:1148
__do_kmalloc_node mm/slab_common.c:995 [inline]
__kmalloc_node_track_caller+0x110/0x230 mm/slab_common.c:1027
memdup_user_nul+0x2c/0xf0 mm/util.c:284
bitmap_parse_user+0x23/0x70 lib/bitmap.c:464
cpumask_parse_user include/linux/cpumask.h:777 [inline]
write_irq_affinity kernel/irq/proc.c:153 [inline]
irq_affinity_proc_write+0x13c/0x230 kernel/irq/proc.c:182
pde_write fs/proc/inode.c:340 [inline]
proc_reg_write+0x1e4/0x2d0 fs/proc/inode.c:352
vfs_write+0x299/0x9a0 fs/read_write.c:582
ksys_write+0x151/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1fa579e019
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:00007f1fa66ad028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f1fa5a25fa0 RCX: 00007f1fa579e019
RDX: 00000000fffffdd4 RSI: 0000200000000340 RDI: 0000000000000003
RBP: 00007f1fa583500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1fa5a26038 R14: 00007f1fa5a25fa0 R15: 00007ffdfc26aa68
</TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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If you want to undo deduplication, reply with:
#syz undup

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: fb28aa725e05 Linux 6.1.180
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=133678c6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=31dfefc4a14efea3
dashboard link: https://syzkaller.appspot.com/bug?extid=1f95abaf50735b83527d

compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:

disk image: https://storage.googleapis.com/syzbot-assets/9a6fe2a54d0f/disk-fb28aa72.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/742b23a1d931/vmlinux-fb28aa72.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b3f257c16d2e/bzImage-fb28aa72.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:

Reported-by: syzbot+1f95ab...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 10156 at mm/page_alloc.c:5634 __alloc_pages+0x2fe/0x4f0 mm/page_alloc.c:5634
Modules linked in:
CPU: 0 PID: 10156 Comm: syz.2.1481 Not tainted syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026

RIP: 0010:__alloc_pages+0x2fe/0x4f0 mm/page_alloc.c:5634
Code: 0c 25 28 00 00 00 48 3b 8c 24 a0 00 00 00 0f 85 9f 00 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 c6 05 16 a1 44 0c 01 <0f> 0b eb a4 a9 00 00 08 00 8b 74 24 04 75 3e 44 89 f1 81 e1 7f ff
RSP: 0018:ffffc90003cffa20 EFLAGS: 00010246
RAX: ffffc90003cffa00 RBX: 1ffff9200079ff48 RCX: 0000000000000000
RDX: 0000000000000028 RSI: 0000000000000000 RDI: ffffc90003cffa88
RBP: ffffc90003cffb10 R08: ffffc90003cffa87 R09: ffffc90003cffa60
R10: dffffc0000000000 R11: fffff5200079ff51 R12: 0000000000000013

R13: 0000000000000000 R14: 0000000000040cc0 R15: dffffc0000000000

FS: 00007f91b5de96c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f48da994440 CR3: 0000000019afc000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Call Trace:
<TASK>
__alloc_pages_node include/linux/gfp.h:237 [inline]
alloc_pages_node include/linux/gfp.h:260 [inline]

__kmalloc_large_node+0x8c/0x1f0 mm/slab_common.c:1077
__do_kmalloc_node mm/slab_common.c:924 [inline]
__kmalloc_node_track_caller+0x10f/0x240 mm/slab_common.c:956
memdup_user_nul+0x28/0xf0 mm/util.c:261
bitmap_parse_user+0x1f/0x60 lib/bitmap.c:464
cpumask_parse_user include/linux/cpumask.h:725 [inline]
write_irq_affinity+0x1bc/0x310 kernel/irq/proc.c:153
pde_write fs/proc/inode.c:340 [inline]
proc_reg_write+0x1dd/0x2c0 fs/proc/inode.c:352
vfs_write+0x2dc/0x9a0 fs/read_write.c:582
ksys_write+0x14d/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f91b4f9e019

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:00007f91b5de9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f91b5225fa0 RCX: 00007f91b4f9e019

RDX: 00000000fffffdd4 RSI: 0000200000000340 RDI: 0000000000000003

RBP: 00007f91b503500c R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

R13: 00007f91b5226038 R14: 00007f91b5225fa0 R15: 00007fff51a19c68

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: fb28aa725e05 Linux 6.1.180
git tree: linux-6.1.y

console output: https://syzkaller.appspot.com/x/log.txt?x=16acac9e580000

kernel config: https://syzkaller.appspot.com/x/.config?x=31dfefc4a14efea3
dashboard link: https://syzkaller.appspot.com/bug?extid=1f95abaf50735b83527d
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1798f4c6580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14164649580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9a6fe2a54d0f/disk-fb28aa72.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/742b23a1d931/vmlinux-fb28aa72.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b3f257c16d2e/bzImage-fb28aa72.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1f95ab...@syzkaller.appspotmail.com

------------[ cut here ]------------

WARNING: CPU: 0 PID: 4424 at mm/page_alloc.c:5634 __alloc_pages+0x2fe/0x4f0 mm/page_alloc.c:5634
Modules linked in:
CPU: 0 PID: 4424 Comm: syz.0.17 Not tainted syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__alloc_pages+0x2fe/0x4f0 mm/page_alloc.c:5634
Code: 0c 25 28 00 00 00 48 3b 8c 24 a0 00 00 00 0f 85 9f 00 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 c6 05 16 a1 44 0c 01 <0f> 0b eb a4 a9 00 00 08 00 8b 74 24 04 75 3e 44 89 f1 81 e1 7f ff

RSP: 0018:ffffc900041b7a20 EFLAGS: 00010246
RAX: ffffc900041b7a00 RBX: 1ffff92000836f48 RCX: 0000000000000000
RDX: 0000000000000028 RSI: 0000000000000000 RDI: ffffc900041b7a88
RBP: ffffc900041b7b10 R08: ffffc900041b7a87 R09: ffffc900041b7a60
R10: dffffc0000000000 R11: fffff52000836f51 R12: 0000000000000013

R13: 0000000000000000 R14: 0000000000040cc0 R15: dffffc0000000000

FS: 000055555a859500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000001b2e663fff CR3: 00000000293cc000 CR4: 00000000003506f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__alloc_pages_node include/linux/gfp.h:237 [inline]
alloc_pages_node include/linux/gfp.h:260 [inline]
__kmalloc_large_node+0x8c/0x1f0 mm/slab_common.c:1077
__do_kmalloc_node mm/slab_common.c:924 [inline]
__kmalloc_node_track_caller+0x10f/0x240 mm/slab_common.c:956
memdup_user_nul+0x28/0xf0 mm/util.c:261
bitmap_parse_user+0x1f/0x60 lib/bitmap.c:464
cpumask_parse_user include/linux/cpumask.h:725 [inline]
write_irq_affinity+0x1bc/0x310 kernel/irq/proc.c:153
pde_write fs/proc/inode.c:340 [inline]
proc_reg_write+0x1dd/0x2c0 fs/proc/inode.c:352
vfs_write+0x2dc/0x9a0 fs/read_write.c:582
ksys_write+0x14d/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2

RIP: 0033:0x7f6f08b9e019

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:00007ffdf77a79f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f6f08e25fa0 RCX: 00007f6f08b9e019

RDX: 00000000fffffdd4 RSI: 0000200000000340 RDI: 0000000000000003

RBP: 00007f6f08c3500c R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

R13: 00007f6f08e25fac R14: 00007f6f08e25fa0 R15: 00007f6f08e25fa0
</TASK>


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: a1153c0deb44 Linux 6.6.147
git tree: linux-6.6.y

console output: https://syzkaller.appspot.com/x/log.txt?x=13d74649580000

kernel config: https://syzkaller.appspot.com/x/.config?x=f0bc3d90c30838b5
dashboard link: https://syzkaller.appspot.com/bug?extid=304ce94b7efa3a6313d4
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13a5f4c6580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11dc4db9580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9f646bfa1b52/disk-a1153c0d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a2aec2e8f0fd/vmlinux-a1153c0d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a7abe1f87405/bzImage-a1153c0d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+304ce9...@syzkaller.appspotmail.com

------------[ cut here ]------------

WARNING: CPU: 1 PID: 5932 at mm/page_alloc.c:4477 __alloc_pages+0x2e4/0x460 mm/page_alloc.c:4477
Modules linked in:
CPU: 1 PID: 5932 Comm: syz.0.17 Not tainted syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__alloc_pages+0x2e4/0x460 mm/page_alloc.c:4477
Code: 0c 25 28 00 00 00 48 3b 8c 24 a0 00 00 00 0f 85 9f 00 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 c6 05 92 1b a3 0c 01 <0f> 0b eb a4 a9 00 00 08 00 8b 74 24 0c 75 3e 44 89 f1 81 e1 7f ff

RSP: 0018:ffffc90003377a20 EFLAGS: 00010246
RAX: ffffc90003377a00 RBX: 1ffff9200066ef48 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90003377a88
RBP: ffffc90003377b10 R08: ffffc90003377a87 R09: 0000000000000000
R10: ffffc90003377a60 R11: fffff5200066ef51 R12: 0000000000000013

R13: 0000000000000000 R14: 0000000000040cc0 R15: dffffc0000000000

FS: 0000555594ccd500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000001b2ce63fff CR3: 0000000074291000 CR4: 00000000003506e0

Call Trace:
<TASK>
__alloc_pages_node include/linux/gfp.h:237 [inline]
alloc_pages_node include/linux/gfp.h:260 [inline]
__kmalloc_large_node+0x8c/0x1f0 mm/slab_common.c:1148
__do_kmalloc_node mm/slab_common.c:995 [inline]
__kmalloc_node_track_caller+0x110/0x230 mm/slab_common.c:1027
memdup_user_nul+0x2c/0xf0 mm/util.c:284
bitmap_parse_user+0x23/0x70 lib/bitmap.c:464
cpumask_parse_user include/linux/cpumask.h:777 [inline]
write_irq_affinity kernel/irq/proc.c:153 [inline]
irq_affinity_proc_write+0x13c/0x230 kernel/irq/proc.c:182
pde_write fs/proc/inode.c:340 [inline]
proc_reg_write+0x1e4/0x2d0 fs/proc/inode.c:352
vfs_write+0x299/0x9a0 fs/read_write.c:582
ksys_write+0x151/0x260 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2

RIP: 0033:0x7f691119e019

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:00007ffdd517c918 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f6911425fa0 RCX: 00007f691119e019

RDX: 00000000fffffdd4 RSI: 0000200000000340 RDI: 0000000000000003

RBP: 00007f691123500c R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

R13: 00007f6911425fac R14: 00007f6911425fa0 R15: 00007f6911425fa0

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 6e2fd6534337 Linux 5.15.213
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=17ad8132580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f161cbc9aef65db0
dashboard link: https://syzkaller.appspot.com/bug?extid=9278fd3e9041a9869efa

compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d7b46606b13d/disk-6e2fd653.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/da120fdeb081/vmlinux-6e2fd653.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3c2643457e3f/bzImage-6e2fd653.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:

Reported-by: syzbot+9278fd...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 5095 at mm/page_alloc.c:5476 current_gfp_context include/linux/sched/mm.h:-1 [inline]
WARNING: CPU: 0 PID: 5095 at mm/page_alloc.c:5476 __alloc_pages+0x39f/0x480 mm/page_alloc.c:5488
Modules linked in:
CPU: 0 PID: 5095 Comm: syz.1.185 Not tainted syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026

RIP: 0010:__alloc_pages+0x39f/0x480 mm/page_alloc.c:5476
Code: 31 ff e9 b1 fe ff ff e8 6f c8 0b 08 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 4f fd ff ff 4c 89 e7 e8 36 d3 09 00 e9 42 fd ff ff <0f> 0b 45 31 ff e9 ee fe ff ff 65 44 8b 2d 17 c9 4d 7e 41 83 fd 08
RSP: 0018:ffffc90003e7fa00 EFLAGS: 00010246
RAX: ffffc90003e7fa40 RBX: 1ffff920007cff44 RCX: 0000000000000000
RDX: 0000000000000028 RSI: 0000000000000000 RDI: ffffc90003e7fa68
RBP: ffffc90003e7faf0 R08: ffffc90003e7fa67 R09: ffffc90003e7fa40
R10: dffffc0000000000 R11: fffff520007cff4d R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000040cc0 R15: 0000000000000013
FS: 00007fb287ffa6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000055556d44f9c8 CR3: 0000000060726000 CR4: 00000000003506f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>

kmalloc_order+0x40/0x150 mm/slab_common.c:986
kmalloc_order_trace+0x14/0xf0 mm/slab_common.c:1002
memdup_user_nul+0x23/0xf0 mm/util.c:260
bitmap_parse_user+0x1f/0x60 lib/bitmap.c:453
cpumask_parse_user include/linux/cpumask.h:623 [inline]
write_irq_affinity kernel/irq/proc.c:153 [inline]
irq_affinity_proc_write+0x107/0x1d0 kernel/irq/proc.c:182
pde_write fs/proc/inode.c:335 [inline]
proc_reg_write+0x1dd/0x2c0 fs/proc/inode.c:347
vfs_write+0x304/0xd70 fs/read_write.c:592
ksys_write+0x153/0x260 fs/read_write.c:647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb289da20d9

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:00007fb287ffa028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fb28a029fa0 RCX: 00007fb289da20d9
RDX: 00000000fffffcf0 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007fb289e39024 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

R13: 00007fb28a02a038 R14: 00007fb28a029fa0 R15: 00007ffe927dc308

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 6e2fd6534337 Linux 5.15.213
git tree: linux-5.15.y

console output: https://syzkaller.appspot.com/x/log.txt?x=158b97b9580000

kernel config: https://syzkaller.appspot.com/x/.config?x=f161cbc9aef65db0
dashboard link: https://syzkaller.appspot.com/bug?extid=9278fd3e9041a9869efa
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14b36e49580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1525729e580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d7b46606b13d/disk-6e2fd653.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/da120fdeb081/vmlinux-6e2fd653.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3c2643457e3f/bzImage-6e2fd653.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9278fd...@syzkaller.appspotmail.com

------------[ cut here ]------------

WARNING: CPU: 0 PID: 4426 at mm/page_alloc.c:5476 current_gfp_context include/linux/sched/mm.h:-1 [inline]
WARNING: CPU: 0 PID: 4426 at mm/page_alloc.c:5476 __alloc_pages+0x39f/0x480 mm/page_alloc.c:5488
Modules linked in:
CPU: 0 PID: 4426 Comm: syz.0.17 Not tainted syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__alloc_pages+0x39f/0x480 mm/page_alloc.c:5476
Code: 31 ff e9 b1 fe ff ff e8 6f c8 0b 08 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 4f fd ff ff 4c 89 e7 e8 36 d3 09 00 e9 42 fd ff ff <0f> 0b 45 31 ff e9 ee fe ff ff 65 44 8b 2d 17 c9 4d 7e 41 83 fd 08

RSP: 0018:ffffc90002fdfa00 EFLAGS: 00010246
RAX: ffffc90002fdfa40 RBX: 1ffff920005fbf44 RCX: 0000000000000000
RDX: 0000000000000028 RSI: 0000000000000000 RDI: ffffc90002fdfa68
RBP: ffffc90002fdfaf0 R08: ffffc90002fdfa67 R09: ffffc90002fdfa40
R10: dffffc0000000000 R11: fffff520005fbf4d R12: dffffc0000000000

R13: 0000000000000000 R14: 0000000000040cc0 R15: 0000000000000013

FS: 0000555562aef500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000558c23781950 CR3: 00000000245b8000 CR4: 00000000003506f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
kmalloc_order+0x40/0x150 mm/slab_common.c:986
kmalloc_order_trace+0x14/0xf0 mm/slab_common.c:1002
memdup_user_nul+0x23/0xf0 mm/util.c:260
bitmap_parse_user+0x1f/0x60 lib/bitmap.c:453
cpumask_parse_user include/linux/cpumask.h:623 [inline]
write_irq_affinity kernel/irq/proc.c:153 [inline]
irq_affinity_proc_write+0x107/0x1d0 kernel/irq/proc.c:182
pde_write fs/proc/inode.c:335 [inline]
proc_reg_write+0x1dd/0x2c0 fs/proc/inode.c:347
vfs_write+0x304/0xd70 fs/read_write.c:592
ksys_write+0x153/0x260 fs/read_write.c:647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0

RIP: 0033:0x7f90ea71d0d9

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:00007ffc73422fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f90ea9a4fa0 RCX: 00007f90ea71d0d9

RDX: 00000000fffffcf0 RSI: 0000000000000000 RDI: 0000000000000003

RBP: 00007f90ea7b4024 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

R13: 00007f90ea9a4fac R14: 00007f90ea9a4fa0 R15: 00007f90ea9a4fa0