syzbot

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
f738be2f-e3f1-43ad-962c-97abf31909ed	repro		❓	WARNING in request_threaded_irq	2026/03/08 16:20	2026/03/08 16:20	2026/03/08 16:27	31e9c887f7dc24e04b3ca70d0d54fc34141844b0

repro

❓

2026/03/08 16:20

2026/03/08 16:27

31e9c887f7dc24e04b3ca70d0d54fc34141844b0

r0 = openat(AT_FDCWD, &(0x7f0000000000)='/dev/comedi0\x00', 0x2) ioctl(r0, 0x40946406, &(0x7f0000000100)="636f6d6564695f706172706f727400000000000078030000050000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000") ioctl(r0, 0x40946406, &(0x7f0000000200)="636f6d6564695f706172706f7274000000000000bc0300000500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")

------------[ cut here ]------------ WARNING: [irq_settings_is_per_cpu_devid(desc)] kernel/irq/manage.c:2125 at request_threaded_irq+0x320/0x38c kernel/irq/manage.c:2125, CPU#1: syz.2.83/5317 Modules linked in: CPU: 1 UID: 0 PID: 5317 Comm: syz.2.83 Not tainted syzkaller #0 PREEMPT Hardware name: riscv-virtio,qemu (DT) epc : request_threaded_irq+0x320/0x38c kernel/irq/manage.c:2125 ra : request_threaded_irq+0x320/0x38c kernel/irq/manage.c:2125 epc : ffffffff8032d750 ra : ffffffff8032d750 sp : ffff8f8004007810 gp : ffffffff89f9df20 tp : ffffaf801b9a1a80 t0 : ffffffff86391c0a t1 : ffffffff9136c6e0 t2 : ffffffff8016a132 s0 : ffff8f8004007870 s1 : 0000000000000000 a0 : 0000000000000005 a1 : 0000000000000000 a2 : 0000000000080000 a3 : ffffffff8032d750 a4 : ffff8f800af48eb8 a5 : 000000000000feb8 a6 : 0000000000000003 a7 : ffffffff86660460 s2 : 0000000000200000 s3 : ffffaf8011e8d000 s4 : 0000000000000005 s5 : ffffffff84b56ef4 s6 : ffffaf801c167000 s7 : 0000000000000000 s8 : ffffffff87597e60 s9 : 0000000000020000 s10: ffffaf801c167000 s11: 0000000000000001 t3 : 0000000000000001 t4 : 0000000000001fff t5 : 00000000000000c8 t6 : 0000000000000002 ssp : 0000000000000000 status: 0000000200000120 badaddr: ffffffff8032d750 cause: 0000000000000003 [<ffffffff8032d750>] request_threaded_irq+0x320/0x38c kernel/irq/manage.c:2125 [<ffffffff84b58918>] request_irq include/linux/interrupt.h:176 [inline] [<ffffffff84b58918>] parport_attach drivers/comedi/drivers/comedi_parport.c:235 [inline] [<ffffffff84b58918>] parport_attach+0x780/0xb14 drivers/comedi/drivers/comedi_parport.c:224 [<ffffffff84b492bc>] comedi_device_attach+0x350/0x7ec drivers/comedi/drivers.c:1069 [<ffffffff84b35136>] do_devconfig_ioctl+0x1a2/0x654 drivers/comedi/comedi_fops.c:928 [<ffffffff84b3dfd8>] comedi_unlocked_ioctl+0x338/0x2c10 drivers/comedi/comedi_fops.c:2240 [<ffffffff80ca9130>] vfs_ioctl fs/ioctl.c:51 [inline] [<ffffffff80ca9130>] __do_sys_ioctl fs/ioctl.c:597 [inline] [<ffffffff80ca9130>] __se_sys_ioctl fs/ioctl.c:583 [inline] [<ffffffff80ca9130>] __riscv_sys_ioctl+0x17c/0x1e4 fs/ioctl.c:583 [<ffffffff80078192>] syscall_handler+0x92/0x114 arch/riscv/include/asm/syscall.h:112 [<ffffffff86391c0a>] do_trap_ecall_u+0x3d2/0x58c arch/riscv/kernel/traps.c:344 [<ffffffff863bb61e>] handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:232

Trajectory:
Seq	Timestamp	Type	Name	Duration
0/0	2026/03/08 16:20	flow	repro	6m Results: map[ReproOpts:{ "procs": 1, "type": "none", "repeat": true } ReproSyz:r0 = openat(AT_FDCWD, &(0x7f0000000000)='/dev/comedi0\x00', 0x2) ioctl(r0, 0x40946406, &(0x7f0000000100)="636f6d6564695f706172706f727400000000000078030000050000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000") ioctl(r0, 0x40946406, &(0x7f0000000200)="636f6d6564695f706172706f7274000000000000bc0300000500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000") SyzkallerCommit:31e9c887f7dc24e04b3ca70d0d54fc34141844b0]
1/1	2026/03/08 16:20	action	provide-var	0m Results: map[DescriptionFiles:[acpi_thermal_rel.txt aio.txt auto.txt binfmt.txt bpf.txt bpf_prog.txt bpf_trace.txt cgroup.txt damon.txt dev_ashmem.txt dev_bifrost.txt dev_binder.txt dev_binderfs.txt dev_block.txt dev_bsg.txt dev_bus_usb.txt dev_camx.txt dev_cdrom.txt dev_cec.txt dev_char_usb.txt dev_comedi.txt dev_dma_heap.txt dev_dri.txt dev_dsp.txt dev_dvb_demux.txt dev_dvb_dvr.txt dev_dvb_frontend.txt dev_fb.txt dev_floppy.txt dev_hidraw.txt dev_i2c.txt dev_i915.txt dev_img_rogue.txt dev_infiniband_rdma.txt dev_infiniband_rdma_cm.txt dev_input.txt dev_iommu.txt dev_kvm.txt dev_kvm_amd64.txt dev_kvm_arm64.txt dev_kvm_extra.txt dev_kvm_riscv64.txt dev_loop.txt dev_mali.txt dev_media.txt dev_msm.txt dev_msr.txt dev_nbd.txt dev_net_tun.txt dev_panthor.txt dev_ppp.txt dev_ptmx.txt dev_ptp.txt dev_qat_adf_ctl.txt dev_qrtr_tun.txt dev_random.txt dev_rfkill.txt dev_rtc.txt dev_sequencer.txt dev_sg.txt dev_snapshot.txt dev_snd_control.txt dev_snd_hw.txt dev_snd_midi.txt dev_snd_pcm.txt dev_snd_seq.txt dev_snd_timer.txt dev_sr.txt dev_sw_sync.txt dev_tlk_device.txt dev_trusty.txt dev_udmabuf.txt dev_uhid.txt dev_uinput.txt dev_usb_hiddev.txt dev_usbmon.txt dev_userio.txt dev_vfio.txt dev_vga_arbiter.txt dev_vhci.txt dev_video4linux.txt dev_video4linux_vim2m.txt dev_virtual_nci.txt dev_vtpm.txt fanotify.txt filesystem.txt fs_9p.txt fs_fuse.txt fs_incfs.txt fs_ioctl.txt fs_ioctl_autofs.txt fs_ioctl_btrfs.txt fs_ioctl_ext4.txt fs_ioctl_f2fs.txt fs_ioctl_fat.txt fs_ioctl_fscrypt.txt fs_ioctl_fsverity.txt fs_ioctl_xfs.txt futex.txt hafnium.txt inotify.txt io_uring.txt ipc.txt key.txt kfuzztest.txt l2cap.txt landlock.txt lsm.txt namespaces.txt net_80211.txt netfilter.txt netfilter_arp.txt netfilter_bridge.txt netfilter_ipv4.txt netfilter_ipv6.txt netfilter_ipvs.txt netfilter_targets.txt pagemap_ioctl.txt perf.txt prctl.txt quotactl.txt seccomp.txt security_apparmor.txt security_selinux.txt security_smack.txt socket.txt socket_alg.txt socket_ax25.txt socket_bluetooth.txt socket_caif.txt socket_can.txt socket_ieee802154.txt socket_inet.txt socket_inet6.txt socket_inet_dccp.txt socket_inet_icmp.txt socket_inet_igmp.txt socket_inet_l2tp.txt socket_inet_sctp.txt socket_inet_tcp.txt socket_inet_udp.txt socket_ip_tunnel.txt socket_isdn.txt socket_kcm.txt socket_key.txt socket_llc.txt socket_netlink.txt socket_netlink_audit.txt socket_netlink_crypto.txt socket_netlink_generic.txt socket_netlink_generic_80211.txt socket_netlink_generic_batadv.txt socket_netlink_generic_devlink.txt socket_netlink_generic_ethtool.txt socket_netlink_generic_fou.txt socket_netlink_generic_gtp.txt socket_netlink_generic_mptcp.txt socket_netlink_generic_net_dm.txt socket_netlink_generic_netlabel.txt socket_netlink_generic_nfc.txt socket_netlink_generic_seg6.txt socket_netlink_generic_smc.txt socket_netlink_generic_team.txt socket_netlink_generic_wireguard.txt socket_netlink_netfilter.txt socket_netlink_netfilter_acct.txt socket_netlink_netfilter_conntrack.txt socket_netlink_netfilter_conntrack_exp.txt socket_netlink_netfilter_conntrack_helper.txt socket_netlink_netfilter_ipset.txt socket_netlink_netfilter_log.txt socket_netlink_netfilter_nft_compat.txt socket_netlink_netfilter_nftables.txt socket_netlink_netfilter_osf.txt socket_netlink_netfilter_queue.txt socket_netlink_netfilter_timeout.txt socket_netlink_rdma.txt socket_netlink_route.txt socket_netlink_route_sched.txt socket_netlink_route_sched_retired.txt socket_netlink_sock_diag.txt socket_netlink_xfrm.txt socket_netrom.txt socket_nfc.txt socket_nvme_of_tcp.txt socket_packet.txt socket_phonet.txt socket_pppox.txt socket_qipcrtr.txt socket_rds.txt socket_rose.txt socket_rxrpc.txt socket_tipc.txt socket_tipc_netlink.txt socket_unix.txt socket_vnet.txt socket_x25.txt socket_xdp.txt sys.txt uffd.txt usbip.txt vmw_vmci.txt vnet.txt vnet_mptcp.txt vusb.txt watch_queue.txt xattr.txt] SyzkallerCommit:31e9c887f7dc24e04b3ca70d0d54fc34141844b0]
2/1	2026/03/08 16:20	action	kernel-checkouter	0m Results: map[KernelSrc:/usr/local/google/home/dvyukov/syzkaller/agent/workdir/cache/src/0c773f0ef186f0deec9a4fb5db4cb4852e2ef035]
3/1	2026/03/08 16:21	action	kernel-builder	3m Results: map[KernelObj:/usr/local/google/home/dvyukov/syzkaller/agent/workdir/cache/build/a684ef854053d49410451eaf5992955d300b5148]
4/1	2026/03/08 16:25	agent	crash-repro-finder	2m Model: gemini-3-pro-preview Results: map[ReproOpts:{ "procs": 1, "type": "none", "repeat": true }] Instruction: You are an expert in linux kernel fuzzing. Your goal is to write a syzkaller program to trigger a specific bug. Print only the syz program that could be executed directly, without backticks. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Bug Title: WARNING in request_threaded_irq Original Crash Report: ------------[ cut here ]------------ WARNING: [irq_settings_is_per_cpu_devid(desc)] kernel/irq/manage.c:2125 at request_threaded_irq+0x320/0x38c kernel/irq/manage.c:2125, CPU#1: syz.2.83/5317 Modules linked in: CPU: 1 UID: 0 PID: 5317 Comm: syz.2.83 Not tainted syzkaller #0 PREEMPT Hardware name: riscv-virtio,qemu (DT) epc : request_threaded_irq+0x320/0x38c kernel/irq/manage.c:2125 ra : request_threaded_irq+0x320/0x38c kernel/irq/manage.c:2125 epc : ffffffff8032d750 ra : ffffffff8032d750 sp : ffff8f8004007810 gp : ffffffff89f9df20 tp : ffffaf801b9a1a80 t0 : ffffffff86391c0a t1 : ffffffff9136c6e0 t2 : ffffffff8016a132 s0 : ffff8f8004007870 s1 : 0000000000000000 a0 : 0000000000000005 a1 : 0000000000000000 a2 : 0000000000080000 a3 : ffffffff8032d750 a4 : ffff8f800af48eb8 a5 : 000000000000feb8 a6 : 0000000000000003 a7 : ffffffff86660460 s2 : 0000000000200000 s3 : ffffaf8011e8d000 s4 : 0000000000000005 s5 : ffffffff84b56ef4 s6 : ffffaf801c167000 s7 : 0000000000000000 s8 : ffffffff87597e60 s9 : 0000000000020000 s10: ffffaf801c167000 s11: 0000000000000001 t3 : 0000000000000001 t4 : 0000000000001fff t5 : 00000000000000c8 t6 : 0000000000000002 ssp : 0000000000000000 status: 0000000200000120 badaddr: ffffffff8032d750 cause: 0000000000000003 [<ffffffff8032d750>] request_threaded_irq+0x320/0x38c kernel/irq/manage.c:2125 [<ffffffff84b58918>] request_irq include/linux/interrupt.h:176 [inline] [<ffffffff84b58918>] parport_attach drivers/comedi/drivers/comedi_parport.c:235 [inline] [<ffffffff84b58918>] parport_attach+0x780/0xb14 drivers/comedi/drivers/comedi_parport.c:224 [<ffffffff84b492bc>] comedi_device_attach+0x350/0x7ec drivers/comedi/drivers.c:1069 [<ffffffff84b35136>] do_devconfig_ioctl+0x1a2/0x654 drivers/comedi/comedi_fops.c:928 [<ffffffff84b3dfd8>] comedi_unlocked_ioctl+0x338/0x2c10 drivers/comedi/comedi_fops.c:2240 [<ffffffff80ca9130>] vfs_ioctl fs/ioctl.c:51 [inline] [<ffffffff80ca9130>] __do_sys_ioctl fs/ioctl.c:597 [inline] [<ffffffff80ca9130>] __se_sys_ioctl fs/ioctl.c:583 [inline] [<ffffffff80ca9130>] __riscv_sys_ioctl+0x17c/0x1e4 fs/ioctl.c:583 [<ffffffff80078192>] syscall_handler+0x92/0x114 arch/riscv/include/asm/syscall.h:112 [<ffffffff86391c0a>] do_trap_ecall_u+0x3d2/0x58c arch/riscv/kernel/traps.c:344 [<ffffffff863bb61e>] handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:232 The list of existing description files: acpi_thermal_rel.txt aio.txt auto.txt binfmt.txt bpf.txt bpf_prog.txt bpf_trace.txt cgroup.txt damon.txt dev_ashmem.txt dev_bifrost.txt dev_binder.txt dev_binderfs.txt dev_block.txt dev_bsg.txt dev_bus_usb.txt dev_camx.txt dev_cdrom.txt dev_cec.txt dev_char_usb.txt dev_comedi.txt dev_dma_heap.txt dev_dri.txt dev_dsp.txt dev_dvb_demux.txt dev_dvb_dvr.txt dev_dvb_frontend.txt dev_fb.txt dev_floppy.txt dev_hidraw.txt dev_i2c.txt dev_i915.txt dev_img_rogue.txt dev_infiniband_rdma.txt dev_infiniband_rdma_cm.txt dev_input.txt dev_iommu.txt dev_kvm.txt dev_kvm_amd64.txt dev_kvm_arm64.txt dev_kvm_extra.txt dev_kvm_riscv64.txt dev_loop.txt dev_mali.txt dev_media.txt dev_msm.txt dev_msr.txt dev_nbd.txt dev_net_tun.txt dev_panthor.txt dev_ppp.txt dev_ptmx.txt dev_ptp.txt dev_qat_adf_ctl.txt dev_qrtr_tun.txt dev_random.txt dev_rfkill.txt dev_rtc.txt dev_sequencer.txt dev_sg.txt dev_snapshot.txt dev_snd_control.txt dev_snd_hw.txt dev_snd_midi.txt dev_snd_pcm.txt dev_snd_seq.txt dev_snd_timer.txt dev_sr.txt dev_sw_sync.txt dev_tlk_device.txt dev_trusty.txt dev_udmabuf.txt dev_uhid.txt dev_uinput.txt dev_usb_hiddev.txt dev_usbmon.txt dev_userio.txt dev_vfio.txt dev_vga_arbiter.txt dev_vhci.txt dev_video4linux.txt dev_video4linux_vim2m.txt dev_virtual_nci.txt dev_vtpm.txt fanotify.txt filesystem.txt fs_9p.txt fs_fuse.txt fs_incfs.txt fs_ioctl.txt fs_ioctl_autofs.txt fs_ioctl_btrfs.txt fs_ioctl_ext4.txt fs_ioctl_f2fs.txt fs_ioctl_fat.txt fs_ioctl_fscrypt.txt fs_ioctl_fsverity.txt fs_ioctl_xfs.txt futex.txt hafnium.txt inotify.txt io_uring.txt ipc.txt key.txt kfuzztest.txt l2cap.txt landlock.txt lsm.txt namespaces.txt net_80211.txt netfilter.txt netfilter_arp.txt netfilter_bridge.txt netfilter_ipv4.txt netfilter_ipv6.txt netfilter_ipvs.txt netfilter_targets.txt pagemap_ioctl.txt perf.txt prctl.txt quotactl.txt seccomp.txt security_apparmor.txt security_selinux.txt security_smack.txt socket.txt socket_alg.txt socket_ax25.txt socket_bluetooth.txt socket_caif.txt socket_can.txt socket_ieee802154.txt socket_inet.txt socket_inet6.txt socket_inet_dccp.txt socket_inet_icmp.txt socket_inet_igmp.txt socket_inet_l2tp.txt socket_inet_sctp.txt socket_inet_tcp.txt socket_inet_udp.txt socket_ip_tunnel.txt socket_isdn.txt socket_kcm.txt socket_key.txt socket_llc.txt socket_netlink.txt socket_netlink_audit.txt socket_netlink_crypto.txt socket_netlink_generic.txt socket_netlink_generic_80211.txt socket_netlink_generic_batadv.txt socket_netlink_generic_devlink.txt socket_netlink_generic_ethtool.txt socket_netlink_generic_fou.txt socket_netlink_generic_gtp.txt socket_netlink_generic_mptcp.txt socket_netlink_generic_net_dm.txt socket_netlink_generic_netlabel.txt socket_netlink_generic_nfc.txt socket_netlink_generic_seg6.txt socket_netlink_generic_smc.txt socket_netlink_generic_team.txt socket_netlink_generic_wireguard.txt socket_netlink_netfilter.txt socket_netlink_netfilter_acct.txt socket_netlink_netfilter_conntrack.txt socket_netlink_netfilter_conntrack_exp.txt socket_netlink_netfilter_conntrack_helper.txt socket_netlink_netfilter_ipset.txt socket_netlink_netfilter_log.txt socket_netlink_netfilter_nft_compat.txt socket_netlink_netfilter_nftables.txt socket_netlink_netfilter_osf.txt socket_netlink_netfilter_queue.txt socket_netlink_netfilter_timeout.txt socket_netlink_rdma.txt socket_netlink_route.txt socket_netlink_route_sched.txt socket_netlink_route_sched_retired.txt socket_netlink_sock_diag.txt socket_netlink_xfrm.txt socket_netrom.txt socket_nfc.txt socket_nvme_of_tcp.txt socket_packet.txt socket_phonet.txt socket_pppox.txt socket_qipcrtr.txt socket_rds.txt socket_rose.txt socket_rxrpc.txt socket_tipc.txt socket_tipc_netlink.txt socket_unix.txt socket_vnet.txt socket_x25.txt socket_xdp.txt sys.txt uffd.txt usbip.txt vmw_vmci.txt vnet.txt vnet_mptcp.txt vusb.txt watch_queue.txt xattr.txt Reply: r0 = openat(AT_FDCWD, &(0x7f0000000000)='/dev/comedi0\x00', 0x2) ioctl(r0, 0x40946406, &(0x7f0000000100)="636f6d6564695f706172706f727400000000000078030000050000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000") ioctl(r0, 0x40946406, &(0x7f0000000200)="636f6d6564695f706172706f7274000000000000bc0300000500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")
5/2	2026/03/08 16:25	llm	crash-repro-finder	2m Model: gemini-3-pro-preview Tokens: input: 3289 output: 43 thoughts: 14085 Thoughts: Triggering a Warning in `request_threaded_irq` within the `comedi_parport` Driver My goal is to craft a Syzkaller program that triggers the warning: `WARNING: [irq_settings_is_per_cpu_devid(desc)] kernel/irq/manage.c:2125` within the kernel. This warning arises when `request_threaded_irq` is called with a per-CPU interrupt (or an equivalent flag) but the interrupt descriptor isn't appropriately marked as per-CPU. The crash report indicates this warning occurs within the `comedi_parport` driver, specifically during the `parport_attach` function, which is reached through a sequence involving `comedi_unlocked_ioctl`, `do_devconfig_ioctl`, and `comedi_device_attach`. The vulnerable ioctl appears to be `COMEDI_DEVCONFIG`. The core issue lies in how the driver handles interrupt requests. The `parport_attach` function, upon receiving a non-zero interrupt number from the user via the `COMEDI_DEVCONFIG` ioctl, calls `request_irq`, which essentially wraps `request_threaded_irq` with the `0` flag. The warning is triggered inside `request_threaded_irq` if it's called with `IRQF_PERCPU` (implied or used) and the IRQ descriptor is not a per-cpu one (or vice versa). I need to pass an IRQ number corresponding to a per-CPU interrupt on the target RISC-V architecture. On RISC-V QEMU, the per-CPU interrupts are local and timer interrupts. I identified IRQ 5 (timer interrupt, STIP) as a likely candidate. The `parport_attach` uses the `options[1]` field from the `comedi_devconfig` struct to determine the IRQ number. The `options[0]` contains the IO base, which also needs to be a valid resource, but doesn't seem to be the primary cause of the warning. Therefore, the strategy is this: 1. Open `/dev/comedi0`. 2. Execute `COMEDI_DEVCONFIG` ioctl. 3. Within the `comedi_devconfig` struct passed to the ioctl, set `board_name` to "comedi\_parport" and `options[1]` to 5 (IRQ 5). A valid I/O base has to be passed as well. I'll test it first with `0x378`. 4. This should trigger `parport_attach` with an IRQ number of 5, thus calling `request_irq(5, ...)` and triggering the warning, because the descriptor is flagged as `_IRQ_PER_CPU_DEVID`. The syzkaller program I've constructed for this purpose is: ``` r0 = openat(AT_FDCWD, &(0x7f0000000000)='/dev/comedi0\x00', 0x2) ioctl(r0, 0x40946406, &(0x7f0000000100)="636f6d6564695f706172706f727400000000000078030000050000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000") ``` The hex string represents the `comedi_devconfig` struct, including the "comedi\_parport" board name,
6/2	2026/03/08 16:27	tool	set-results	0m Args: map[ReproOpts:{ "procs": 1, "type": "none", "repeat": true }] Results: map[ReproOpts:{ "procs": 1, "type": "none", "repeat": true }]
7/2	2026/03/08 16:27	llm	crash-repro-finder	0m Model: gemini-3-pro-preview Tokens: input: 18483 output: 706 thoughts: 0

Trajectory:

Seq

Timestamp

Type

Name

Duration

0/0

2026/03/08 16:20

flow

repro

Results:

map[ReproOpts:{
    "procs": 1,
    "type": "none",
    "repeat": true
} ReproSyz:r0 = openat(AT_FDCWD, &(0x7f0000000000)='/dev/comedi0\x00', 0x2)
ioctl(r0, 0x40946406, &(0x7f0000000100)="636f6d6564695f706172706f727400000000000078030000050000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")
ioctl(r0, 0x40946406, &(0x7f0000000200)="636f6d6564695f706172706f7274000000000000bc0300000500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")
 SyzkallerCommit:31e9c887f7dc24e04b3ca70d0d54fc34141844b0]

1/1

2026/03/08 16:20

action

provide-var

Results:

map[DescriptionFiles:[acpi_thermal_rel.txt aio.txt auto.txt binfmt.txt bpf.txt bpf_prog.txt bpf_trace.txt cgroup.txt damon.txt dev_ashmem.txt dev_bifrost.txt dev_binder.txt dev_binderfs.txt dev_block.txt dev_bsg.txt dev_bus_usb.txt dev_camx.txt dev_cdrom.txt dev_cec.txt dev_char_usb.txt dev_comedi.txt dev_dma_heap.txt dev_dri.txt dev_dsp.txt dev_dvb_demux.txt dev_dvb_dvr.txt dev_dvb_frontend.txt dev_fb.txt dev_floppy.txt dev_hidraw.txt dev_i2c.txt dev_i915.txt dev_img_rogue.txt dev_infiniband_rdma.txt dev_infiniband_rdma_cm.txt dev_input.txt dev_iommu.txt dev_kvm.txt dev_kvm_amd64.txt dev_kvm_arm64.txt dev_kvm_extra.txt dev_kvm_riscv64.txt dev_loop.txt dev_mali.txt dev_media.txt dev_msm.txt dev_msr.txt dev_nbd.txt dev_net_tun.txt dev_panthor.txt dev_ppp.txt dev_ptmx.txt dev_ptp.txt dev_qat_adf_ctl.txt dev_qrtr_tun.txt dev_random.txt dev_rfkill.txt dev_rtc.txt dev_sequencer.txt dev_sg.txt dev_snapshot.txt dev_snd_control.txt dev_snd_hw.txt dev_snd_midi.txt dev_snd_pcm.txt dev_snd_seq.txt dev_snd_timer.txt dev_sr.txt dev_sw_sync.txt dev_tlk_device.txt dev_trusty.txt dev_udmabuf.txt dev_uhid.txt dev_uinput.txt dev_usb_hiddev.txt dev_usbmon.txt dev_userio.txt dev_vfio.txt dev_vga_arbiter.txt dev_vhci.txt dev_video4linux.txt dev_video4linux_vim2m.txt dev_virtual_nci.txt dev_vtpm.txt fanotify.txt filesystem.txt fs_9p.txt fs_fuse.txt fs_incfs.txt fs_ioctl.txt fs_ioctl_autofs.txt fs_ioctl_btrfs.txt fs_ioctl_ext4.txt fs_ioctl_f2fs.txt fs_ioctl_fat.txt fs_ioctl_fscrypt.txt fs_ioctl_fsverity.txt fs_ioctl_xfs.txt futex.txt hafnium.txt inotify.txt io_uring.txt ipc.txt key.txt kfuzztest.txt l2cap.txt landlock.txt lsm.txt namespaces.txt net_80211.txt netfilter.txt netfilter_arp.txt netfilter_bridge.txt netfilter_ipv4.txt netfilter_ipv6.txt netfilter_ipvs.txt netfilter_targets.txt pagemap_ioctl.txt perf.txt prctl.txt quotactl.txt seccomp.txt security_apparmor.txt security_selinux.txt security_smack.txt socket.txt socket_alg.txt socket_ax25.txt socket_bluetooth.txt socket_caif.txt socket_can.txt socket_ieee802154.txt socket_inet.txt socket_inet6.txt socket_inet_dccp.txt socket_inet_icmp.txt socket_inet_igmp.txt socket_inet_l2tp.txt socket_inet_sctp.txt socket_inet_tcp.txt socket_inet_udp.txt socket_ip_tunnel.txt socket_isdn.txt socket_kcm.txt socket_key.txt socket_llc.txt socket_netlink.txt socket_netlink_audit.txt socket_netlink_crypto.txt socket_netlink_generic.txt socket_netlink_generic_80211.txt socket_netlink_generic_batadv.txt socket_netlink_generic_devlink.txt socket_netlink_generic_ethtool.txt socket_netlink_generic_fou.txt socket_netlink_generic_gtp.txt socket_netlink_generic_mptcp.txt socket_netlink_generic_net_dm.txt socket_netlink_generic_netlabel.txt socket_netlink_generic_nfc.txt socket_netlink_generic_seg6.txt socket_netlink_generic_smc.txt socket_netlink_generic_team.txt socket_netlink_generic_wireguard.txt socket_netlink_netfilter.txt socket_netlink_netfilter_acct.txt socket_netlink_netfilter_conntrack.txt socket_netlink_netfilter_conntrack_exp.txt socket_netlink_netfilter_conntrack_helper.txt socket_netlink_netfilter_ipset.txt socket_netlink_netfilter_log.txt socket_netlink_netfilter_nft_compat.txt socket_netlink_netfilter_nftables.txt socket_netlink_netfilter_osf.txt socket_netlink_netfilter_queue.txt socket_netlink_netfilter_timeout.txt socket_netlink_rdma.txt socket_netlink_route.txt socket_netlink_route_sched.txt socket_netlink_route_sched_retired.txt socket_netlink_sock_diag.txt socket_netlink_xfrm.txt socket_netrom.txt socket_nfc.txt socket_nvme_of_tcp.txt socket_packet.txt socket_phonet.txt socket_pppox.txt socket_qipcrtr.txt socket_rds.txt socket_rose.txt socket_rxrpc.txt socket_tipc.txt socket_tipc_netlink.txt socket_unix.txt socket_vnet.txt socket_x25.txt socket_xdp.txt sys.txt uffd.txt usbip.txt vmw_vmci.txt vnet.txt vnet_mptcp.txt vusb.txt watch_queue.txt xattr.txt] SyzkallerCommit:31e9c887f7dc24e04b3ca70d0d54fc34141844b0]

2/1

2026/03/08 16:20

action

kernel-checkouter

Results:

map[KernelSrc:/usr/local/google/home/dvyukov/syzkaller/agent/workdir/cache/src/0c773f0ef186f0deec9a4fb5db4cb4852e2ef035]

3/1

2026/03/08 16:21

action

kernel-builder

Results:

map[KernelObj:/usr/local/google/home/dvyukov/syzkaller/agent/workdir/cache/build/a684ef854053d49410451eaf5992955d300b5148]

4/1

2026/03/08 16:25

agent

crash-repro-finder

Model:

gemini-3-pro-preview

Results:

map[ReproOpts:{
    "procs": 1,
    "type": "none",
    "repeat": true
}]

Instruction:

You are an expert in linux kernel fuzzing. Your goal is to write a syzkaller program to trigger a specific bug.
Print only the syz program that could be executed directly, without backticks.




Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

Prompt:

Bug Title: WARNING in request_threaded_irq

Original Crash Report:
------------[ cut here ]------------
WARNING: [irq_settings_is_per_cpu_devid(desc)] kernel/irq/manage.c:2125 at request_threaded_irq+0x320/0x38c kernel/irq/manage.c:2125, CPU#1: syz.2.83/5317
Modules linked in:
CPU: 1 UID: 0 PID: 5317 Comm: syz.2.83 Not tainted syzkaller #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
epc : request_threaded_irq+0x320/0x38c kernel/irq/manage.c:2125
 ra : request_threaded_irq+0x320/0x38c kernel/irq/manage.c:2125
epc : ffffffff8032d750 ra : ffffffff8032d750 sp : ffff8f8004007810
 gp : ffffffff89f9df20 tp : ffffaf801b9a1a80 t0 : ffffffff86391c0a
 t1 : ffffffff9136c6e0 t2 : ffffffff8016a132 s0 : ffff8f8004007870
 s1 : 0000000000000000 a0 : 0000000000000005 a1 : 0000000000000000
 a2 : 0000000000080000 a3 : ffffffff8032d750 a4 : ffff8f800af48eb8
 a5 : 000000000000feb8 a6 : 0000000000000003 a7 : ffffffff86660460
 s2 : 0000000000200000 s3 : ffffaf8011e8d000 s4 : 0000000000000005
 s5 : ffffffff84b56ef4 s6 : ffffaf801c167000 s7 : 0000000000000000
 s8 : ffffffff87597e60 s9 : 0000000000020000 s10: ffffaf801c167000
 s11: 0000000000000001 t3 : 0000000000000001 t4 : 0000000000001fff
 t5 : 00000000000000c8 t6 : 0000000000000002 ssp : 0000000000000000
status: 0000000200000120 badaddr: ffffffff8032d750 cause: 0000000000000003
[<ffffffff8032d750>] request_threaded_irq+0x320/0x38c kernel/irq/manage.c:2125
[<ffffffff84b58918>] request_irq include/linux/interrupt.h:176 [inline]
[<ffffffff84b58918>] parport_attach drivers/comedi/drivers/comedi_parport.c:235 [inline]
[<ffffffff84b58918>] parport_attach+0x780/0xb14 drivers/comedi/drivers/comedi_parport.c:224
[<ffffffff84b492bc>] comedi_device_attach+0x350/0x7ec drivers/comedi/drivers.c:1069
[<ffffffff84b35136>] do_devconfig_ioctl+0x1a2/0x654 drivers/comedi/comedi_fops.c:928
[<ffffffff84b3dfd8>] comedi_unlocked_ioctl+0x338/0x2c10 drivers/comedi/comedi_fops.c:2240
[<ffffffff80ca9130>] vfs_ioctl fs/ioctl.c:51 [inline]
[<ffffffff80ca9130>] __do_sys_ioctl fs/ioctl.c:597 [inline]
[<ffffffff80ca9130>] __se_sys_ioctl fs/ioctl.c:583 [inline]
[<ffffffff80ca9130>] __riscv_sys_ioctl+0x17c/0x1e4 fs/ioctl.c:583
[<ffffffff80078192>] syscall_handler+0x92/0x114 arch/riscv/include/asm/syscall.h:112
[<ffffffff86391c0a>] do_trap_ecall_u+0x3d2/0x58c arch/riscv/kernel/traps.c:344
[<ffffffff863bb61e>] handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:232


The list of existing description files:
acpi_thermal_rel.txt
aio.txt
auto.txt
binfmt.txt
bpf.txt
bpf_prog.txt
bpf_trace.txt
cgroup.txt
damon.txt
dev_ashmem.txt
dev_bifrost.txt
dev_binder.txt
dev_binderfs.txt
dev_block.txt
dev_bsg.txt
dev_bus_usb.txt
dev_camx.txt
dev_cdrom.txt
dev_cec.txt
dev_char_usb.txt
dev_comedi.txt
dev_dma_heap.txt
dev_dri.txt
dev_dsp.txt
dev_dvb_demux.txt
dev_dvb_dvr.txt
dev_dvb_frontend.txt
dev_fb.txt
dev_floppy.txt
dev_hidraw.txt
dev_i2c.txt
dev_i915.txt
dev_img_rogue.txt
dev_infiniband_rdma.txt
dev_infiniband_rdma_cm.txt
dev_input.txt
dev_iommu.txt
dev_kvm.txt
dev_kvm_amd64.txt
dev_kvm_arm64.txt
dev_kvm_extra.txt
dev_kvm_riscv64.txt
dev_loop.txt
dev_mali.txt
dev_media.txt
dev_msm.txt
dev_msr.txt
dev_nbd.txt
dev_net_tun.txt
dev_panthor.txt
dev_ppp.txt
dev_ptmx.txt
dev_ptp.txt
dev_qat_adf_ctl.txt
dev_qrtr_tun.txt
dev_random.txt
dev_rfkill.txt
dev_rtc.txt
dev_sequencer.txt
dev_sg.txt
dev_snapshot.txt
dev_snd_control.txt
dev_snd_hw.txt
dev_snd_midi.txt
dev_snd_pcm.txt
dev_snd_seq.txt
dev_snd_timer.txt
dev_sr.txt
dev_sw_sync.txt
dev_tlk_device.txt
dev_trusty.txt
dev_udmabuf.txt
dev_uhid.txt
dev_uinput.txt
dev_usb_hiddev.txt
dev_usbmon.txt
dev_userio.txt
dev_vfio.txt
dev_vga_arbiter.txt
dev_vhci.txt
dev_video4linux.txt
dev_video4linux_vim2m.txt
dev_virtual_nci.txt
dev_vtpm.txt
fanotify.txt
filesystem.txt
fs_9p.txt
fs_fuse.txt
fs_incfs.txt
fs_ioctl.txt
fs_ioctl_autofs.txt
fs_ioctl_btrfs.txt
fs_ioctl_ext4.txt
fs_ioctl_f2fs.txt
fs_ioctl_fat.txt
fs_ioctl_fscrypt.txt
fs_ioctl_fsverity.txt
fs_ioctl_xfs.txt
futex.txt
hafnium.txt
inotify.txt
io_uring.txt
ipc.txt
key.txt
kfuzztest.txt
l2cap.txt
landlock.txt
lsm.txt
namespaces.txt
net_80211.txt
netfilter.txt
netfilter_arp.txt
netfilter_bridge.txt
netfilter_ipv4.txt
netfilter_ipv6.txt
netfilter_ipvs.txt
netfilter_targets.txt
pagemap_ioctl.txt
perf.txt
prctl.txt
quotactl.txt
seccomp.txt
security_apparmor.txt
security_selinux.txt
security_smack.txt
socket.txt
socket_alg.txt
socket_ax25.txt
socket_bluetooth.txt
socket_caif.txt
socket_can.txt
socket_ieee802154.txt
socket_inet.txt
socket_inet6.txt
socket_inet_dccp.txt
socket_inet_icmp.txt
socket_inet_igmp.txt
socket_inet_l2tp.txt
socket_inet_sctp.txt
socket_inet_tcp.txt
socket_inet_udp.txt
socket_ip_tunnel.txt
socket_isdn.txt
socket_kcm.txt
socket_key.txt
socket_llc.txt
socket_netlink.txt
socket_netlink_audit.txt
socket_netlink_crypto.txt
socket_netlink_generic.txt
socket_netlink_generic_80211.txt
socket_netlink_generic_batadv.txt
socket_netlink_generic_devlink.txt
socket_netlink_generic_ethtool.txt
socket_netlink_generic_fou.txt
socket_netlink_generic_gtp.txt
socket_netlink_generic_mptcp.txt
socket_netlink_generic_net_dm.txt
socket_netlink_generic_netlabel.txt
socket_netlink_generic_nfc.txt
socket_netlink_generic_seg6.txt
socket_netlink_generic_smc.txt
socket_netlink_generic_team.txt
socket_netlink_generic_wireguard.txt
socket_netlink_netfilter.txt
socket_netlink_netfilter_acct.txt
socket_netlink_netfilter_conntrack.txt
socket_netlink_netfilter_conntrack_exp.txt
socket_netlink_netfilter_conntrack_helper.txt
socket_netlink_netfilter_ipset.txt
socket_netlink_netfilter_log.txt
socket_netlink_netfilter_nft_compat.txt
socket_netlink_netfilter_nftables.txt
socket_netlink_netfilter_osf.txt
socket_netlink_netfilter_queue.txt
socket_netlink_netfilter_timeout.txt
socket_netlink_rdma.txt
socket_netlink_route.txt
socket_netlink_route_sched.txt
socket_netlink_route_sched_retired.txt
socket_netlink_sock_diag.txt
socket_netlink_xfrm.txt
socket_netrom.txt
socket_nfc.txt
socket_nvme_of_tcp.txt
socket_packet.txt
socket_phonet.txt
socket_pppox.txt
socket_qipcrtr.txt
socket_rds.txt
socket_rose.txt
socket_rxrpc.txt
socket_tipc.txt
socket_tipc_netlink.txt
socket_unix.txt
socket_vnet.txt
socket_x25.txt
socket_xdp.txt
sys.txt
uffd.txt
usbip.txt
vmw_vmci.txt
vnet.txt
vnet_mptcp.txt
vusb.txt
watch_queue.txt
xattr.txt

Reply:

r0 = openat(AT_FDCWD, &(0x7f0000000000)='/dev/comedi0\x00', 0x2)
ioctl(r0, 0x40946406, &(0x7f0000000100)="636f6d6564695f706172706f727400000000000078030000050000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")
ioctl(r0, 0x40946406, &(0x7f0000000200)="636f6d6564695f706172706f7274000000000000bc0300000500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")

5/2

2026/03/08 16:25

llm

crash-repro-finder

Model:

gemini-3-pro-preview

Tokens:

							input: 3289
							output: 43
							thoughts: 14085

Thoughts:

**Triggering a Warning in `request_threaded_irq` within the `comedi_parport` Driver**

My goal is to craft a Syzkaller program that triggers the warning: `WARNING: [irq_settings_is_per_cpu_devid(desc)] kernel/irq/manage.c:2125` within the kernel. This warning arises when `request_threaded_irq` is called with a per-CPU interrupt (or an equivalent flag) but the interrupt descriptor isn't appropriately marked as per-CPU.

The crash report indicates this warning occurs within the `comedi_parport` driver, specifically during the `parport_attach` function, which is reached through a sequence involving `comedi_unlocked_ioctl`, `do_devconfig_ioctl`, and `comedi_device_attach`. The vulnerable ioctl appears to be `COMEDI_DEVCONFIG`.

The core issue lies in how the driver handles interrupt requests. The `parport_attach` function, upon receiving a non-zero interrupt number from the user via the `COMEDI_DEVCONFIG` ioctl, calls `request_irq`, which essentially wraps `request_threaded_irq` with the `0` flag. The warning is triggered inside `request_threaded_irq` if it's called with `IRQF_PERCPU` (implied or used) and the IRQ descriptor is not a per-cpu one (or vice versa). I need to pass an IRQ number corresponding to a per-CPU interrupt on the target RISC-V architecture.

On RISC-V QEMU, the per-CPU interrupts are local and timer interrupts. I identified IRQ 5 (timer interrupt, STIP) as a likely candidate. The `parport_attach` uses the `options[1]` field from the `comedi_devconfig` struct to determine the IRQ number. The `options[0]` contains the IO base, which also needs to be a valid resource, but doesn't seem to be the primary cause of the warning.

Therefore, the strategy is this:

1. Open `/dev/comedi0`.
2. Execute `COMEDI_DEVCONFIG` ioctl.
3. Within the `comedi_devconfig` struct passed to the ioctl, set `board_name` to "comedi\_parport" and `options[1]` to 5 (IRQ 5). A valid I/O base has to be passed as well. I'll test it first with `0x378`.
4. This should trigger `parport_attach` with an IRQ number of 5, thus calling `request_irq(5, ...)` and triggering the warning, because the descriptor is flagged as `_IRQ_PER_CPU_DEVID`.

The syzkaller program I've constructed for this purpose is:

```
r0 = openat(AT_FDCWD, &(0x7f0000000000)='/dev/comedi0\x00', 0x2)
ioctl(r0, 0x40946406, &(0x7f0000000100)="636f6d6564695f706172706f727400000000000078030000050000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")
```

The hex string represents the `comedi_devconfig` struct, including the "comedi\_parport" board name,

6/2

2026/03/08 16:27

tool

set-results

Args:

map[ReproOpts:{
    "procs": 1,
    "type": "none",
    "repeat": true
}]

Results:

map[ReproOpts:{
    "procs": 1,
    "type": "none",
    "repeat": true
}]

7/2

2026/03/08 16:27

llm

crash-repro-finder

Model:

gemini-3-pro-preview

Tokens:

							input: 18483
							output: 706
							thoughts: 0