Oops: divide error: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 14776 Comm: syz.0.2310 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 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 26 91 fa f8 48 8d 7b 34 48 b8 00 00 RSP: 0018:ffffc90000007d90 EFLAGS: 00010046 RAX: 0000000000000001 RBX: ffff888024f27800 RCX: 1ffff110049e4f10 RDX: 0000000000000000 RSI: ffffffff88c279f8 RDI: ffff888024f27880 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f348d5616c0(0000) GS:ffff888124a0a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3e5b63 CR3: 000000004e0bb000 CR4: 00000000003526f0 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+0xba/0xe0 arch/x86/kernel/irq.c:318 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688 RIP: 0010:finish_task_switch.isra.0+0x22a/0xc10 kernel/sched/core.c:5193 Code: fb 09 00 00 44 8b 05 39 ef f7 0e 45 85 c0 0f 85 be 01 00 00 4c 89 e7 e8 a4 f6 ff ff e8 0f d5 3a 00 fb 65 48 8b 1d de 27 17 12 <48> 8d bb 58 16 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffffc9000bf3f5a8 EFLAGS: 00000202 RAX: 000000000000d90d RBX: ffff888021790000 RCX: 0000000000000006 RDX: 0000000000000000 RSI: ffffffff8da2a287 RDI: ffffffff8bf06e40 RBP: ffffc9000bf3f5f0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff9081f6d7 R11: 0000000000000001 R12: ffff8880b843a380 R13: ffff8880261fc900 R14: ffff8880b843a380 R15: ffff8880b843b1b0 context_switch kernel/sched/core.c:5328 [inline] __schedule+0x1198/0x5de0 kernel/sched/core.c:6929 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:7113 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:194 __unix_dgram_recvmsg+0x315/0xc30 net/unix/af_unix.c:2626 unix_dgram_recvmsg+0xd0/0x110 net/unix/af_unix.c:2700 sock_recvmsg_nosec net/socket.c:1078 [inline] ____sys_recvmsg+0x5f9/0x6b0 net/socket.c:2848 ___sys_recvmsg+0x114/0x1a0 net/socket.c:2892 do_recvmmsg+0x2fe/0x750 net/socket.c:2987 __sys_recvmmsg net/socket.c:3061 [inline] __do_sys_recvmmsg net/socket.c:3084 [inline] __se_sys_recvmmsg net/socket.c:3077 [inline] __x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3077 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f348c78efc9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f348d561038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007f348c9e6090 RCX: 00007f348c78efc9 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000007 RBP: 00007f348c811f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f348c9e6128 R14: 00007f348c9e6090 R15: 00007ffe28655e68 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 26 91 fa f8 48 8d 7b 34 48 b8 00 00 RSP: 0018:ffffc90000007d90 EFLAGS: 00010046 RAX: 0000000000000001 RBX: ffff888024f27800 RCX: 1ffff110049e4f10 RDX: 0000000000000000 RSI: ffffffff88c279f8 RDI: ffff888024f27880 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f348d5616c0(0000) GS:ffff888124a0a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3e5b63 CR3: 000000004e0bb000 CR4: 00000000003526f0 ---------------- 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 26 91 fa f8 call 0xf8fa915d 37: 48 8d 7b 34 lea 0x34(%rbx),%rdi 3b: 48 rex.W 3c: b8 .byte 0xb8