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I'm trying to figure out how this can happen. One potential scenario I see is if we have mm->nr_cpus_allowed > num_possible_cpus(). Is that possible ? We strongly rely on having mm->nr_cpus_allowed <= num_possible_cpus() in __mm_cid_try_get(). When a process is created, it takes the main thread's p->nr_cpus_allowed as initial value. Then it is updated by mm_set_cpus_allowed(). It is basically a union each thread allowed CPUs masks. Can we expect all scheduler classes (including ext) to guarantee the affinity context only includes CPUs that are present in the possible CPU mask ? Thanks, Mathieu > >> WARNING: CPU: 1 PID: 12208 at ./include/linux/cpumask.h:135 cpumask_check include/linux/cpumask.h:142 [inline] >> WARNING: CPU: 1 PID: 12208 at ./include/linux/cpumask.h:135 cpumask_clear_cpu include/linux/cpumask.h:620 [inline] >> WARNING: CPU: 1 PID: 12208 at ./include/linux/cpumask.h:135 __mm_cid_put kernel/sched/sched.h:3622 [inline] >> WARNING: CPU: 1 PID: 12208 at ./include/linux/cpumask.h:135 sched_mm_cid_remote_clear+0x488/0x4f0 kernel/sched/core.c:10543 >> Modules linked in: >> CPU: 1 UID: 0 PID: 12208 Comm: syz.4.2719 Not tainted 6.16.0-rc7-syzkaller-00034-g25fae0b93d1d #0 PREEMPT(full) >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 >> RIP: 0010:cpu_max_bits_warn include/linux/cpumask.h:135 [inline] >> RIP: 0010:cpumask_check include/linux/cpumask.h:142 [inline] >> RIP: 0010:cpumask_clear_cpu include/linux/cpumask.h:620 [inline] >> RIP: 0010:__mm_cid_put kernel/sched/sched.h:3622 [inline] >> RIP: 0010:sched_mm_cid_remote_clear+0x488/0x4f0 kernel/sched/core.c:10543 >> Code: 0f 01 e8 3b 71 0e 00 eb 9d 4c 89 ef e8 f1 73 97 00 e9 67 fc ff ff e8 e7 73 97 00 e9 47 fd ff ff 89 44 24 48 e9 17 fe ff ff 90 <0f> 0b 90 e9 f0 fd ff ff e8 8b b3 fc 09 e9 06 ff ff ff 48 89 d6 48 >> RSP: 0018:ffffc9000480fcc8 EFLAGS: 00010012 >> RAX: 0000000000000093 RBX: ffffe8ffffc476c0 RCX: ffffffff8189c611 >> RDX: 00000000ffffffff RSI: 0000000000000004 RDI: ffffc9000480fd10 >> RBP: 1ffff92000901f9a R08: 0000000000000001 R09: fffff52000901fa2 >> R10: 0000000000000003 R11: 0000000000000001 R12: ffff88807b22ed50 >> R13: ffffe8ffffc476c8 R14: 0000000000000200 R15: ffff8880b843a2c0 >> FS: 000055556f5a3500(0000) GS:ffff888124820000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 000055558d727588 CR3: 00000000668d0000 CR4: 00000000003526f0 >> Call Trace: >> >> sched_mm_cid_remote_clear_old kernel/sched/core.c:10576 [inline] >> task_mm_cid_work+0x3b4/0x910 kernel/sched/core.c:10626 >> task_work_run+0x14d/0x240 kernel/task_work.c:227 >> resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] >> exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:114 >> exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] >> syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] >> syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] >> do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100 >> entry_SYSCALL_64_after_hwframe+0x77/0x7f >> RIP: 0033:0x7f8ef99c1265 >> Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8 >> RSP: 002b:00007ffe741fc2d0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6 >> RAX: 0000000000000000 RBX: 00007f8ef9bb5fa0 RCX: 00007f8ef99c1265 >> RDX: 00007ffe741fc310 RSI: 0000000000000000 RDI: 0000000000000000 >> RBP: 00007f8ef9bb7ba0 R08: 0000000000000000 R09: 00007f8efa7eb000 >> R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000048110 >> R13: 00007f8ef9bb6080 R14: ffffffffffffffff R15: 00007ffe741fc450 >> >> >> >> --- >> This report is generated by a bot. It may contain errors. >> See https://goo.gl/tpsmEJ for more information about syzbot. >> syzbot engineers can be reached at syzkaller@googlegroups.com. >> >> syzbot will keep track of this issue. See: >> https://goo.gl/tpsmEJ#status for how to communicate with syzbot. >> >> If the report is already addressed, let syzbot know by replying with: >> #syz fix: exact-commit-title >> >> If you want to overwrite report's subsystems, reply with: >> #syz set subsystems: new-subsystem >> (See the list of subsystem names on the web dashboard) >> >> If the report is a duplicate of another one, reply with: >> #syz dup: exact-subject-of-another-report >> >> If you want to undo deduplication, reply with: >> #syz undup -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com