Oops: divide error: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 10099 Comm: syz.0.1018 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 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 d6 4a fa f8 48 8d 7b 34 48 b8 00 00 RSP: 0018:ffffc90000007bd8 EFLAGS: 00010046 RAX: 0000000000000001 RBX: ffff888024daa600 RCX: 1ffff110049b54d0 RDX: 0000000000000000 RSI: ffffffff88c29d88 RDI: ffff888024daa680 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000004 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000010000000 FS: 00007fe1007526c0(0000) GS:ffff888124a08000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000003a030 CR3: 0000000035324000 CR4: 00000000003526f0 Call Trace: comedi_buf_write_samples+0x406/0x640 drivers/comedi/comedi_buf.c:603 aio_iiro_16_cos+0x132/0x160 drivers/comedi/drivers/aio_iiro_16.c:69 __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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 26 78 35 f6 48 89 df e8 0e cc 35 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 35 d4 25 f6 65 8b 05 7e 35 3e 08 85 c0 74 16 5b RSP: 0018:ffffc90000007f10 EFLAGS: 00000246 RAX: 0000000000000002 RBX: ffff8880b8427c80 RCX: ffffffff81c4e99f RDX: 0000000000000000 RSI: ffffffff8da2b882 RDI: ffffffff8bf07040 RBP: 0000000000000283 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90820dd7 R11: 0000000000000001 R12: 0000000000000100 R13: 0000000080000101 R14: 0000000000000000 R15: ffffffff8e00c100 handle_softirqs+0x219/0x8e0 kernel/softirq.c:622 __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:finish_task_switch.isra.0+0x22a/0xc10 kernel/sched/core.c:5193 Code: fb 09 00 00 44 8b 05 49 28 f8 0e 45 85 c0 0f 85 be 01 00 00 4c 89 e7 e8 a4 f6 ff ff e8 7f d4 3a 00 fb 65 48 8b 1d ee 69 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:ffffc900036374a8 EFLAGS: 00000202 RAX: 000000000000158f RBX: ffff888053304900 RCX: ffffffff81c4e99f RDX: 0000000000000000 RSI: ffffffff8da2b882 RDI: ffffffff8bf07040 RBP: ffffc900036374f0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90820dd7 R11: 0000000000000001 R12: ffff8880b843a380 R13: ffff88802ce00000 R14: ffff8880b843a380 R15: ffff8880b843b1b0 context_switch kernel/sched/core.c:5328 [inline] __schedule+0x1198/0x5de0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7026 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75 unix_wait_for_peer+0x24e/0x280 net/unix/af_unix.c:1639 unix_dgram_sendmsg+0x1419/0x17f0 net/unix/af_unix.c:2273 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa98/0xc70 net/socket.c:2630 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2684 __sys_sendmmsg+0x200/0x420 net/socket.c:2773 __do_sys_sendmmsg net/socket.c:2800 [inline] __se_sys_sendmmsg net/socket.c:2797 [inline] __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2797 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: 0033:0x7fe0ff98f6c9 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:00007fe100752038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fe0ffbe5fa0 RCX: 00007fe0ff98f6c9 RDX: 0000000000000318 RSI: 00002000000bd000 RDI: 0000000000000006 RBP: 00007fe0ffa11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe0ffbe6038 R14: 00007fe0ffbe5fa0 R15: 00007ffcb4d46938 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 d6 4a fa f8 48 8d 7b 34 48 b8 00 00 RSP: 0018:ffffc90000007bd8 EFLAGS: 00010046 RAX: 0000000000000001 RBX: ffff888024daa600 RCX: 1ffff110049b54d0 RDX: 0000000000000000 RSI: ffffffff88c29d88 RDI: ffff888024daa680 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000004 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000010000000 FS: 00007fe1007526c0(0000) GS:ffff888124a08000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000003a030 CR3: 0000000035324000 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 d6 4a fa f8 call 0xf8fa4b0d 37: 48 8d 7b 34 lea 0x34(%rbx),%rdi 3b: 48 rex.W 3c: b8 .byte 0xb8