genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee0000e when write [fee0000e] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 3916 Comm: syz.1.16 Not tainted 6.16.0-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<813ab000>] lr : [<813aaff0>] psr: 60000013 sp : dfeedd30 ip : dfeedd30 fp : dfeedd54 r10: 82b16f00 r9 : 00000003 r8 : 83fe5780 r7 : dfeedd90 r6 : 83fe5780 r5 : 00000000 r4 : 00000000 r3 : fee0000e r2 : 81e15444 r1 : 00000001 r0 : 813aac70 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85bacf40 DAC: 00000000 Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 83fe5780 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfeec000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 83fe5780 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdfeec000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfeec000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.1.16 (pid: 3916, stack limit = 0xdfeec000) Stack: (0xdfeedd30 to 0xdfeee000) dd20: 823fe300 83fe5780 829cf8ec 829cf8ec dd40: 81e15904 83fe57c4 dfeedd8c dfeedd58 813a7098 813aae98 200000c0 00000000 dd60: dfeedd7c 200000c0 83fe5780 b5403587 200000c0 83381800 40946400 00000002 dd80: dfeede4c dfeedd90 813a2c18 813a6f9c 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 0000000e 0000001f 00010000 00000004 00000003 00000cc7 00000004 ddc0: 00080006 0000000e 00000005 00000002 00000001 00000001 00000001 0000310d dde0: 00000006 00000000 0001a44d 00000003 3fff7fff 00000fff 00000010 00000001 de00: 20001e58 0080000b 00000e69 0000003c 00000008 00000006 00000000 fffffffb de20: 00000000 28a049f4 00000000 848973c0 83fe5780 200000c0 200000c0 83381800 de40: dfeedf14 dfeede50 813a3be4 813a2b24 00000000 00000000 00000000 28a049f4 de60: 00000000 00000000 8247054c 0000005f 840e1058 83fe57b0 841e751c 83381800 de80: dfeedee4 dfeede90 8079794c 8078dcb0 00000064 00000001 00000000 dfeedeac dea0: 85c00910 834e3f68 00006400 0000000b dfeedea0 00000000 00000000 28a049f4 dec0: 848973c0 40946400 200000c0 200000c0 848973c0 00000003 dfeedef4 dfeedee8 dee0: 80797a6c 28a049f4 dfeedf14 40946400 00000000 848973c1 200000c0 848973c0 df00: 00000003 83381800 dfeedfa4 dfeedf18 8056cf08 813a3614 ecac8b10 83381800 df20: dfeedf3c dfeedf30 81a388b8 81a38788 dfeedf54 dfeedf40 8025e490 8028ef8c df40: dfeedfb0 40000000 dfeedf84 dfeedf58 802229ec 8025e44c 00000000 8281cddc df60: dfeedfb0 0014c820 ecac8b10 80222940 00000000 28a049f4 dfeedfac 00000000 df80: 00000000 002f6308 00000036 8020029c 83381800 00000036 00000000 dfeedfa8 dfa0: 80200060 8056cde4 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fe60bc dfe0: 76fe5ec0 76fe5eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813aae8c>] (parport_attach) from [<813a7098>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:83fe57c4 r5:81e15904 r4:829cf8ec [<813a6f90>] (comedi_device_attach) from [<813a2c18>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000002 r9:40946400 r8:83381800 r7:200000c0 r6:b5403587 r5:83fe5780 r4:200000c0 [<813a2b18>] (do_devconfig_ioctl) from [<813a3be4>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:83381800 r7:200000c0 r6:200000c0 r5:83fe5780 r4:848973c0 [<813a3608>] (comedi_unlocked_ioctl) from [<8056cf08>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3608>] (comedi_unlocked_ioctl) from [<8056cf08>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3608>] (comedi_unlocked_ioctl) from [<8056cf08>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3608>] (comedi_unlocked_ioctl) from [<8056cf08>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:83381800 r9:00000003 r8:848973c0 r7:200000c0 r6:848973c1 r5:00000000 r4:40946400 [<8056cdd8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfeedfa8 to 0xdfeedff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fe60bc dfe0: 76fe5ec0 76fe5eb0 0001948c 001322c0 r10:00000036 r9:83381800 r8:8020029c r7:00000036 r6:002f6308 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction