genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 5718 Comm: syz.1.400 Not tainted 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 : [<813cbd20>] lr : [<813cbd10>] psr: 60000013 sp : dfe45d30 ip : dfe45d30 fp : dfe45d54 r10: 82b24908 r9 : 00000003 r8 : 83992540 r7 : dfe45d90 r6 : 83992540 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1767c r1 : 00000001 r0 : 813cb990 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84d10080 DAC: fffffffd 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 83992540 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfe44000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 83992540 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 0xdfe44000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfe44000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.1.400 (pid: 5718, stack limit = 0xdfe44000) Stack: (0xdfe45d30 to 0xdfe46000) 5d20: 823ecd94 83992540 829d1b74 829d1b74 5d40: 81e17b3c 83992584 dfe45d8c dfe45d58 813c7db0 813cbbb8 200000c0 00000000 5d60: dfe45d7c 200000c0 83992540 b5403587 200000c0 83ad0c00 40946400 00000003 5d80: dfe45e4c dfe45d90 813c38fc 813c7cb4 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00004f27 0000001f 40010000 00000004 0000009a 00000cc7 00000004 5dc0: 00080008 0000000e 00000006 00000002 00000001 00000007 00000001 00000005 5de0: 10000105 00000000 00000009 00000003 00000009 00000087 00000010 00000001 5e00: 20001e58 0082000b 00000e69 0000003c 00000008 00000006 ffffffff effffff8 5e20: 00000000 37d3cdf2 00000000 85f4d6c0 83992540 200000c0 200000c0 83ad0c00 5e40: dfe45f14 dfe45e50 813c48c8 813c3808 00000000 00000000 00000000 37d3cdf2 5e60: 00000000 00000000 8245d5b4 0000005f 83d56a30 83992570 8415c714 83ad0c00 5e80: dfe45ee4 dfe45e90 807a6324 8079c71c 00000064 00000001 00000000 dfe45eac 5ea0: 84a7a3d0 834337f8 00006400 0000000b dfe45ea0 00000000 00000000 37d3cdf2 5ec0: 85f4d6c0 40946400 200000c0 200000c0 85f4d6c0 00000003 dfe45ef4 dfe45ee8 5ee0: 807a6444 37d3cdf2 dfe45f14 40946400 00000000 85f4d6c1 200000c0 85f4d6c0 5f00: 00000003 83ad0c00 dfe45fa4 dfe45f18 80578048 813c42f8 ecac8b10 83ad0c00 5f20: dfe45f3c dfe45f30 81a36e58 81a36d28 dfe45f54 dfe45f40 8025c478 8028d90c 5f40: dfe45fb0 40000000 dfe45f84 dfe45f58 802229ec 8025c434 00000000 8281cf74 5f60: dfe45fb0 0014ca70 ecac8b10 80222940 00000000 37d3cdf2 dfe45fac 00000000 5f80: 00000000 00316308 00000036 8020029c 83ad0c00 00000036 00000000 dfe45fa8 5fa0: 80200060 80577f24 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fdb0bc 5fe0: 76fdaec0 76fdaeb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813cbbac>] (parport_attach) from [<813c7db0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:83992584 r5:81e17b3c r4:829d1b74 [<813c7ca8>] (comedi_device_attach) from [<813c38fc>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83ad0c00 r7:200000c0 r6:b5403587 r5:83992540 r4:200000c0 [<813c37fc>] (do_devconfig_ioctl) from [<813c48c8>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83ad0c00 r7:200000c0 r6:200000c0 r5:83992540 r4:85f4d6c0 [<813c42ec>] (comedi_unlocked_ioctl) from [<80578048>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c42ec>] (comedi_unlocked_ioctl) from [<80578048>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c42ec>] (comedi_unlocked_ioctl) from [<80578048>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c42ec>] (comedi_unlocked_ioctl) from [<80578048>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83ad0c00 r9:00000003 r8:85f4d6c0 r7:200000c0 r6:85f4d6c1 r5:00000000 r4:40946400 [<80577f18>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfe45fa8 to 0xdfe45ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fdb0bc 5fe0: 76fdaec0 76fdaeb0 000195a4 00132510 r10:00000036 r9:83ad0c00 r8:8020029c r7:00000036 r6:00316308 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