Oops: divide error: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 20468 Comm: syz.5.6103 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 46 33 fa f8 48 8d 7b 34 48 b8 00 00 RSP: 0018:ffffc90000007d90 EFLAGS: 00010046 RAX: 0000000000000001 RBX: ffff8880320a0600 RCX: 1ffff110064140d0 RDX: 0000000000000000 RSI: ffffffff88c2b418 RDI: ffff8880320a0680 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000004 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000010000000 FS: 0000000000000000(0000) GS:ffff888124a05000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055556f177808 CR3: 00000000a7c03000 CR4: 00000000003526f0 DR0: 0000000000000008 DR1: 0000000000000002 DR2: 0000000000000081 DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 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+0xba/0xe0 arch/x86/kernel/irq.c:318 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688 RIP: 0010:lock_acquire+0x62/0x350 kernel/locking/lockdep.c:5872 Code: e6 08 12 83 f8 07 0f 87 bc 02 00 00 89 c0 48 0f a3 05 22 4b e9 0e 0f 82 74 02 00 00 8b 35 9a 7b e9 0e 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 39 e6 08 12 0f 85 c7 02 00 00 48 83 c4 RSP: 0018:ffffc9000d40f710 EFLAGS: 00000206 RAX: 0000000000000046 RBX: ffffffff8e3c4760 RCX: 00000000f29d7888 RDX: 0000000000000000 RSI: ffffffff8da065fa RDI: ffffffff8bf073c0 RBP: 0000000000000002 R08: 8cc7a83358655b46 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] page_table_check_clear+0x190/0x740 mm/page_table_check.c:77 __page_table_check_pte_clear+0xf1/0x100 mm/page_table_check.c:154 page_table_check_pte_clear include/linux/page_table_check.h:51 [inline] ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1270 [inline] get_and_clear_full_ptes include/linux/pgtable.h:725 [inline] zap_present_folio_ptes mm/memory.c:1628 [inline] zap_present_ptes mm/memory.c:1710 [inline] do_zap_pte_range mm/memory.c:1811 [inline] zap_pte_range mm/memory.c:1855 [inline] zap_pmd_range mm/memory.c:1947 [inline] zap_pud_range mm/memory.c:1976 [inline] zap_p4d_range mm/memory.c:1997 [inline] unmap_page_range+0x24d9/0x41b0 mm/memory.c:2018 unmap_single_vma.constprop.0+0x153/0x240 mm/memory.c:2061 unmap_vmas+0x218/0x470 mm/memory.c:2105 exit_mmap+0x1b2/0xb90 mm/mmap.c:1280 __mmput+0x12a/0x410 kernel/fork.c:1133 mmput+0x62/0x70 kernel/fork.c:1156 exit_mm kernel/exit.c:582 [inline] do_exit+0x7c7/0x2bf0 kernel/exit.c:954 __do_sys_exit kernel/exit.c:1074 [inline] __se_sys_exit kernel/exit.c:1072 [inline] __x64_sys_exit+0x42/0x50 kernel/exit.c:1072 x64_sys_call+0x1506/0x1730 arch/x86/include/generated/asm/syscalls_64.h:61 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: 0033:0x7f811ef8f6c9 Code: Unable to access opcode bytes at 0x7f811ef8f69f. RSP: 002b:00007f811fe10fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c RAX: ffffffffffffffda RBX: 00007f811f1e5fa0 RCX: 00007f811ef8f6c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f811f011f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f811f1e6038 R14: 00007f811f1e5fa0 R15: 00007ffc8d27dad8 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 46 33 fa f8 48 8d 7b 34 48 b8 00 00 RSP: 0018:ffffc90000007d90 EFLAGS: 00010046 RAX: 0000000000000001 RBX: ffff8880320a0600 RCX: 1ffff110064140d0 RDX: 0000000000000000 RSI: ffffffff88c2b418 RDI: ffff8880320a0680 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000004 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000010000000 FS: 0000000000000000(0000) GS:ffff888124a05000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055556f177808 CR3: 00000000a7c03000 CR4: 00000000003526f0 DR0: 0000000000000008 DR1: 0000000000000002 DR2: 0000000000000081 DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- 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 46 33 fa f8 call 0xf8fa337d 37: 48 8d 7b 34 lea 0x34(%rbx),%rdi 3b: 48 rex.W 3c: b8 .byte 0xb8