syzbot ci has tested the following series [v3] riscv: Generate riscv instruction functions https://lore.kernel.org/all/[email protected] * [PATCH v3 01/17] riscv: Introduce instruction table generation * [PATCH v3 02/17] riscv: alternatives: Use generated instruction headers for patching code * [PATCH v3 03/17] riscv: kgdb: Use generated instruction headers * [PATCH v3 04/17] riscv: Add kprobes instruction simulation KUnit * [PATCH v3 05/17] riscv: kprobes: Use generated instruction headers * [PATCH v3 06/17] riscv: cfi: Use generated instruction headers * [PATCH v3 07/17] riscv: Maintain epc on misaligned emulation error * [PATCH v3 08/17] riscv: Use generated instruction headers for misaligned loads/stores * [PATCH v3 09/17] riscv: kvm: Use generated instruction headers for csr code * [PATCH v3 10/17] KVM: device: Add test device * [PATCH v3 11/17] KVM: riscv: selftests: Add mmio test * [PATCH v3 12/17] riscv: kvm: Use generated instruction headers for mmio emulation * [PATCH v3 13/17] riscv: kvm: Add emulated test csr * [PATCH v3 14/17] KVM: riscv: selftests: Add csr emulation test * [PATCH v3 15/17] riscv: kvm: Use generated instruction headers for csr emulation * [PATCH v3 16/17] riscv: kexec: Use generated instruction headers for kexec relocations * [PATCH v3 17/17] riscv: Remove unused instruction headers
and found the following issue: WARNING in kvm_io_bus_unregister_dev Full report is available here: https://ci.syzbot.org/series/f3c61796-0ca0-4bfd-add1-23a20352fb7b *** WARNING in kvm_io_bus_unregister_dev tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: 8cd9520d35a6c38db6567e97dd93b1f11f185dc6 arch: amd64 compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6 config: https://ci.syzbot.org/builds/65190eb6-0d65-4629-b225-e3b7089a0b10/config syz repro: https://ci.syzbot.org/findings/fa2c789e-ba9f-4d55-b3ba-0d5f22f78a4d/syz_repro ------------[ cut here ]------------ debug_locks && !(lock_is_held(&(&kvm->slots_lock)->dep_map) != 0) WARNING: arch/x86/kvm/../../../virt/kvm/kvm_main.c:6027 at kvm_io_bus_unregister_dev+0x4b0/0x580 virt/kvm/kvm_main.c:6027, CPU#1: syz.2.19/5828 Modules linked in: CPU: 1 UID: 0 PID: 5828 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:kvm_io_bus_unregister_dev+0x4b0/0x580 virt/kvm/kvm_main.c:6027 Code: 3f fc ff ff e8 a1 ce 86 00 48 c7 c7 40 f7 c1 8b e8 a5 29 e9 ff 48 89 ef e8 ed 00 00 00 b8 f4 ff ff ff eb a3 e8 81 ce 86 00 90 <0f> 0b 90 e9 cd fb ff ff 48 c7 c1 e0 bb 2f 90 80 e1 07 80 c1 03 38 RSP: 0018:ffffc900032afc30 EFLAGS: 00010293 RAX: ffffffff813e81af RBX: ffff88816b133688 RCX: ffff888160aba540 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffc900032afb7f R09: 0000000000000000 R10: ffffc900032afb70 R11: ffffffff81404850 R12: dffffc0000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8881a5354000 FS: 000055555b90c500(0000) GS:ffff8882a92b9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33663fff CR3: 00000001bceb8000 CR4: 0000000000352ef0 Call Trace: <TASK> mmio_test_destroy+0x66/0x90 virt/kvm/mmio_test.c:83 kvm_destroy_devices virt/kvm/kvm_main.c:1251 [inline] kvm_destroy_vm virt/kvm/kvm_main.c:1296 [inline] kvm_put_kvm+0x902/0xae0 virt/kvm/kvm_main.c:1332 kvm_vm_release+0x43/0x50 virt/kvm/kvm_main.c:1355 __fput+0x418/0xa50 fs/file_table.c:510 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0x193/0x6b0 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2f43d9ce59 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:00007ffde9296e78 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007ffde9296f60 RCX: 00007f2f43d9ce59 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 0000000000011938 R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b32a20000 R11: 0000000000000246 R12: 00007ffde9296fa0 R13: 00007f2f44015fac R14: 0000000000011971 R15: 00007f2f44015fa0 </TASK> *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: [email protected] --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at [email protected]. To test a patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported.
