Oops: divide error: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 6422 Comm: kworker/0:7 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: usb_hub_wq hub_event RIP: 0010:comedi_inc_scan_progress+0x1cc/0x340 drivers/comedi/drivers.c:563 Code: 00 00 00 03 43 2c 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 0f b6 14 11 84 d2 74 09 80 fa 03 0f 8e 53 01 00 00 31 d2 b3 80 00 00 00 89 53 2c e8 66 5b fa f8 48 8d 7b 34 48 b8 00 00 RSP: 0018:ffffc90000007be8 EFLAGS: 00010046 RAX: 0000000000000001 RBX: ffff888032762800 RCX: 1ffff110064ec510 RDX: 0000000000000000 RSI: ffffffff88c2b1c8 RDI: ffff888032762880 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124a08000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f74a61156c0 CR3: 000000005b41b000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: comedi_buf_write_samples+0x406/0x640 drivers/comedi/comedi_buf.c:603 parport_interrupt+0xec/0x150 drivers/comedi/drivers/comedi_parport.c:218 __handle_irq_event_percpu+0x236/0x920 kernel/irq/handle.c:203 handle_irq_event_percpu kernel/irq/handle.c:240 [inline] handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:257 handle_edge_irq+0x3ca/0x9e0 kernel/irq/chip.c:855 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline] handle_irq arch/x86/kernel/irq.c:254 [inline] call_irq_handler arch/x86/kernel/irq.c:310 [inline] __common_interrupt+0xd0/0x2f0 arch/x86/kernel/irq.c:325 common_interrupt+0x61/0xe0 arch/x86/kernel/irq.c:318 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688 RIP: 0010:handle_softirqs+0x1dd/0x8e0 kernel/softirq.c:608 Code: 88 6c 24 26 4c 89 7c 24 18 48 c7 c7 20 ce 8b 8b e8 b8 79 e3 09 65 66 c7 05 96 3e 24 12 00 00 e8 c9 cd 47 00 fb bb ff ff ff ff <49> c7 c7 c0 c0 00 8e 41 0f bc dc 83 c3 01 0f 85 a4 00 00 00 e9 b1 RSP: 0018:ffffc90000007f28 EFLAGS: 00000206 RAX: 0000000000050bd8 RBX: 00000000ffffffff RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffffffff8da2b6dd RDI: ffffffff8bf07040 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90820cd7 R11: 0000000000000001 R12: 0000000000000102 R13: 000000000000000a R14: 1ffff92000000fed R15: ffffed1005f69920 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:console_flush_all+0x9a2/0xc60 kernel/printk/printk.c:3200 Code: 00 e8 42 4d 29 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 d0 46 21 00 48 85 db 0f 85 55 01 00 00 e8 52 4b 21 00 fb 4c 89 e0 <48> c1 e8 03 42 80 3c 38 00 0f 84 11 ff ff ff 4c 89 e7 e8 f7 d7 89 RSP: 0018:ffffc90004d3f178 EFLAGS: 00000246 RAX: ffffffff8f05d4b8 RBX: 0000000000000000 RCX: ffffc9001afc5000 RDX: 0000000000100000 RSI: ffffffff819bc24e RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff8f05d4b8 R13: ffffffff8f05d460 R14: ffffc90004d3f208 R15: dffffc0000000000 __console_flush_and_unlock kernel/printk/printk.c:3258 [inline] console_unlock+0xd8/0x210 kernel/printk/printk.c:3298 vprintk_emit+0x3d7/0x680 kernel/printk/printk.c:2423 dev_vprintk_emit drivers/base/core.c:4914 [inline] dev_printk_emit+0xfa/0x140 drivers/base/core.c:4925 __dev_printk+0xf5/0x270 drivers/base/core.c:4937 _dev_notice+0xe4/0x120 drivers/base/core.c:4982 usb_parse_endpoint drivers/usb/core/config.c:427 [inline] usb_parse_interface drivers/usb/core/config.c:636 [inline] usb_parse_configuration drivers/usb/core/config.c:849 [inline] usb_get_configuration+0x43ce/0x6330 drivers/usb/core/config.c:998 usb_enumerate_device drivers/usb/core/hub.c:2526 [inline] usb_new_device+0x11d3/0x1a60 drivers/usb/core/hub.c:2664 hub_port_connect drivers/usb/core/hub.c:5566 [inline] hub_port_connect_change drivers/usb/core/hub.c:5706 [inline] port_event drivers/usb/core/hub.c:5870 [inline] hub_event+0x2f34/0x4fe0 drivers/usb/core/hub.c:5952 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263 process_scheduled_works kernel/workqueue.c:3346 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:comedi_inc_scan_progress+0x1cc/0x340 drivers/comedi/drivers.c:563 Code: 00 00 00 03 43 2c 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 0f b6 14 11 84 d2 74 09 80 fa 03 0f 8e 53 01 00 00 31 d2 b3 80 00 00 00 89 53 2c e8 66 5b fa f8 48 8d 7b 34 48 b8 00 00 RSP: 0018:ffffc90000007be8 EFLAGS: 00010046 RAX: 0000000000000001 RBX: ffff888032762800 RCX: 1ffff110064ec510 RDX: 0000000000000000 RSI: ffffffff88c2b1c8 RDI: ffff888032762880 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124a08000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f74a61156c0 CR3: 000000005b41b000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 00 00 add %al,(%rax) 2: 03 43 2c add 0x2c(%rbx),%eax 5: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx c: fc ff df f: 48 89 f9 mov %rdi,%rcx 12: 48 c1 e9 03 shr $0x3,%rcx 16: 0f b6 14 11 movzbl (%rcx,%rdx,1),%edx 1a: 84 d2 test %dl,%dl 1c: 74 09 je 0x27 1e: 80 fa 03 cmp $0x3,%dl 21: 0f 8e 53 01 00 00 jle 0x17a 27: 31 d2 xor %edx,%edx * 29: f7 b3 80 00 00 00 divl 0x80(%rbx) <-- trapping instruction 2f: 89 53 2c mov %edx,0x2c(%rbx) 32: e8 66 5b fa f8 call 0xf8fa5b9d 37: 48 8d 7b 34 lea 0x34(%rbx),%rdi 3b: 48 rex.W 3c: b8 .byte 0xb8