------------[ cut here ]------------ WARNING: CPU: 0 PID: 7227 at mm/page_alloc.c:4477 __alloc_pages+0x2e4/0x460 mm/page_alloc.c:4477 Modules linked in: CPU: 0 PID: 7227 Comm: iou-wrk-7224 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 0a b3 a2 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:ffffc9000b60f5a0 EFLAGS: 00010246 RAX: ffffc9000b60f500 RBX: 1ffff920016c1eb8 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000b60f608 RBP: ffffc9000b60f690 R08: ffffc9000b60f607 R09: 0000000000000000 R10: ffffc9000b60f5e0 R11: fffff520016c1ec1 R12: 0000000000000010 R13: 0000000000000000 R14: 0000000000040cc0 R15: dffffc0000000000 FS: 00007f5189b516c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3e3c13 CR3: 000000001bf08000 CR4: 00000000003506f0 Call Trace: __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 loop_rw_iter+0x368/0x5b0 io_uring/rw.c:-1 io_write+0x12d5/0x1900 io_uring/rw.c:980 io_issue_sqe+0x295/0xc60 io_uring/io_uring.c:1869 io_wq_submit_work+0x409/0x9d0 io_uring/io_uring.c:1956 io_worker_handle_work+0x7a8/0x10b0 io_uring/io-wq.c:605 io_wq_worker+0x47d/0xf10 io_uring/io-wq.c:659 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293