------------[ cut here ]------------ WARNING: CPU: 3 PID: 10800 at include/linux/cpumask.h:137 is_cpu_allowed kernel/sched/core.c:1809 [inline] WARNING: CPU: 3 PID: 10800 at include/linux/cpumask.h:137 select_task_rq kernel/sched/core.c:2829 [inline] WARNING: CPU: 3 PID: 10800 at include/linux/cpumask.h:137 try_to_wake_up+0xe11/0x14a0 kernel/sched/core.c:3453 Modules linked in: CPU: 3 PID: 10800 Comm: io_wq_manager Not tainted 5.11.0-rc5-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 RIP: 0010:cpu_max_bits_warn include/linux/cpumask.h:137 [inline] RIP: 0010:cpumask_check include/linux/cpumask.h:144 [inline] RIP: 0010:cpumask_check include/linux/cpumask.h:142 [inline] RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:373 [inline] RIP: 0010:is_cpu_allowed kernel/sched/core.c:1800 [inline] RIP: 0010:select_task_rq kernel/sched/core.c:2829 [inline] RIP: 0010:try_to_wake_up+0xe11/0x14a0 kernel/sched/core.c:3453 Code: 00 00 48 81 c7 78 ae 03 8d e8 9b 6c 66 00 48 8b 44 24 10 48 0f a3 05 f6 d1 b4 0b 49 c7 c4 00 4d 03 00 0f 92 c0 e9 bb fd ff ff <0f> 0b e9 7f f5 ff ff 48 8d bd d8 01 00 00 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc90002337d48 EFLAGS: 00010002 RAX: dffffc0000000000 RBX: 1ffff92000466faf RCX: 0000000000000000 RDX: 1ffff1100db3a0ee RSI: ffffffff83beb29b RDI: 0000000000000003 RBP: ffff88806d9d03c0 R08: 0000000000000040 R09: ffffffff8d03ae8f R10: ffffffff83beb258 R11: 0000000000000000 R12: ffff88806d9d0778 R13: 0000000000000206 R14: ffff88806d9d0c68 R15: 0000000000000008 FS: 0000000000000000(0000) GS:ffff88802cd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000731ab8 CR3: 000000005eabc000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: create_io_worker+0x590/0x8d0 fs/io-wq.c:713 io_wq_manager+0x16b/0xb80 fs/io-wq.c:772 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296