Oops: divide error: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 1296 Comm: aoe_tx0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:comedi_buf_munge drivers/comedi/comedi_buf.c:347 [inline]
RIP: 0010:comedi_buf_write_free+0x414/0x720 drivers/comedi/comedi_buf.c:391
Code: 02 00 00 31 d2 f7 74 24 1c 48 8b 54 24 30 48 c1 ea 03 0f b6 14 2a 41 03 44 24 38 84 d2 74 09 80 fa 03 0f 8e 66 02 00 00 31 d2 <41> f7 b4 24 80 00 00 00 48 8b 44 24 48 48 c1 e8 03 41 89 54 24 38
RSP: 0018:ffffc90000007d20 EFLAGS: 00010046
RAX: 0000000000000001 RBX: ffffc90003056000 RCX: ffffffff88be07ff
RDX: 0000000000000000 RSI: ffffffff88bbb020 RDI: 0000000000000004
RBP: dffffc0000000000 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000001 R11: ffff888029a62e3c R12: ffff888029a62e00
R13: 0000000000000002 R14: 0000000000000000 R15: ffffffff88be0740
FS: 0000000000000000(0000) GS:ffff888124e75000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b309feff8 CR3: 000000005b5f6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000008 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
comedi_buf_write_samples+0x3fc/0x640 drivers/comedi/comedi_buf.c:602
das16m1_handler+0x203/0x5a0 drivers/comedi/drivers/das16m1.c:413
das16m1_interrupt+0xb7/0x1c0 drivers/comedi/drivers/das16m1.c:470
__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:693
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 56 fa 46 f6 48 89 df e8 3e 4e 47 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 85 59 37 f6 65 8b 05 9e 4d 2a 08 85 c0 74 16 5b
RSP: 0018:ffffc900046af818 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffffffff9ab68580 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8d82662a RDI: ffffffff8bd045c0
RBP: 0000000000000293 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff905fb397 R11: 0000000000000000 R12: 0000000000000022
R13: ffffffff9ab68688 R14: 0000000000000000 R15: 0000000000000003
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
uart_port_unlock_irqrestore include/linux/serial_core.h:788 [inline]
uart_port_unlock_deref drivers/tty/serial/serial_core.c:91 [inline]
uart_port_unlock_deref drivers/tty/serial/serial_core.c:88 [inline]
uart_write+0x2a4/0xb30 drivers/tty/serial/serial_core.c:637
sl_encaps drivers/net/slip/slip.c:409 [inline]
sl_xmit+0x6d1/0xf30 drivers/net/slip/slip.c:518
__netdev_start_xmit include/linux/netdevice.h:5248 [inline]
netdev_start_xmit include/linux/netdevice.h:5257 [inline]
xmit_one net/core/dev.c:3845 [inline]
dev_hard_start_xmit+0x97/0x740 net/core/dev.c:3861
sch_direct_xmit+0x1b2/0xcf0 net/sched/sch_generic.c:344
__dev_xmit_skb net/core/dev.c:4152 [inline]
__dev_queue_xmit+0x144d/0x4490 net/core/dev.c:4729
dev_queue_xmit include/linux/netdevice.h:3365 [inline]
tx+0xcc/0x190 drivers/block/aoe/aoenet.c:62
kthread+0x1e1/0x3e0 drivers/block/aoe/aoecmd.c:1241
kthread+0x3c2/0x780 kernel/kthread.c:463
ret_from_fork+0x56a/0x730 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:comedi_buf_munge drivers/comedi/comedi_buf.c:347 [inline]
RIP: 0010:comedi_buf_write_free+0x414/0x720 drivers/comedi/comedi_buf.c:391
Code: 02 00 00 31 d2 f7 74 24 1c 48 8b 54 24 30 48 c1 ea 03 0f b6 14 2a 41 03 44 24 38 84 d2 74 09 80 fa 03 0f 8e 66 02 00 00 31 d2 <41> f7 b4 24 80 00 00 00 48 8b 44 24 48 48 c1 e8 03 41 89 54 24 38
RSP: 0018:ffffc90000007d20 EFLAGS: 00010046
RAX: 0000000000000001 RBX: ffffc90003056000 RCX: ffffffff88be07ff
RDX: 0000000000000000 RSI: ffffffff88bbb020 RDI: 0000000000000004
RBP: dffffc0000000000 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000000001 R11: ffff888029a62e3c R12: ffff888029a62e00
R13: 0000000000000002 R14: 0000000000000000 R15: ffffffff88be0740
FS: 0000000000000000(0000) GS:ffff888124e75000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b309feff8 CR3: 000000005b5f6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000008 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 02 00 add (%rax),%al
2: 00 31 add %dh,(%rcx)
4: d2 f7 shl %cl,%bh
6: 74 24 je 0x2c
8: 1c 48 sbb $0x48,%al
a: 8b 54 24 30 mov 0x30(%rsp),%edx
e: 48 c1 ea 03 shr $0x3,%rdx
12: 0f b6 14 2a movzbl (%rdx,%rbp,1),%edx
16: 41 03 44 24 38 add 0x38(%r12),%eax
1b: 84 d2 test %dl,%dl
1d: 74 09 je 0x28
1f: 80 fa 03 cmp $0x3,%dl
22: 0f 8e 66 02 00 00 jle 0x28e
28: 31 d2 xor %edx,%edx
* 2a: 41 f7 b4 24 80 00 00 divl 0x80(%r12) <-- trapping instruction
31: 00
32: 48 8b 44 24 48 mov 0x48(%rsp),%rax
37: 48 c1 e8 03 shr $0x3,%rax
3b: 41 89 54 24 38 mov %edx,0x38(%r12)