genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f29 when write [fee04f29] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 697 Comm: syz.6.23243 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 : [<813ab5e0>] lr : [<813ab5d0>] psr: 600f0013 sp : dfba5d30 ip : dfba5d30 fp : dfba5d54 r10: 82b16f00 r9 : 00000003 r8 : 841f5180 r7 : dfba5d90 r6 : 841f5180 r5 : 00000000 r4 : 00000000 r3 : fee04f29 r2 : 81e15364 r1 : 00000001 r0 : 813ab250 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86437200 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 841f5180 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfba4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 841f5180 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 0xdfba4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfba4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.6.23243 (pid: 697, stack limit = 0xdfba4000) Stack: (0xdfba5d30 to 0xdfba6000) 5d20: 823fe280 841f5180 829cf92c 829cf92c 5d40: 81e15824 841f51c4 dfba5d8c dfba5d58 813a7678 813ab478 20000280 00000000 5d60: dfba5d7c 20000280 841f5180 b5403587 20000280 84ed8c00 40946400 00000003 5d80: dfba5e4c dfba5d90 813a31f8 813a757c 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00004f29 0000001f 000003ff 00000601 00000001 00000cc7 00000fff 5dc0: 5c952399 00000805 000007ff 00000002 00000001 00000002 00000004 00000001 5de0: 0000e1cb 00000005 0001a44b 00000003 00000201 00000be8 fffffff9 00000009 5e00: 20001e56 00000009 00000003 0000003c 00000008 00000004 08000000 00000001 5e20: 00000000 69da4fef 00000000 86c59d80 841f5180 20000280 20000280 84ed8c00 5e40: dfba5f14 dfba5e50 813a41c4 813a3104 00000000 00000000 00000000 69da4fef 5e60: 00000000 00000000 8247054c 0000005f 8405b858 841f51b0 8404f75c 84ed8c00 5e80: dfba5ee4 dfba5e90 80797934 8078dc98 00000064 00000001 00000000 dfba5eac 5ea0: 84715910 834d0330 00006400 0000000b dfba5ea0 00000000 00000000 69da4fef 5ec0: 86c59d80 40946400 20000280 20000280 86c59d80 00000003 dfba5ef4 dfba5ee8 5ee0: 80797a54 69da4fef dfba5f14 40946400 00000000 86c59d81 20000280 86c59d80 5f00: 00000003 84ed8c00 dfba5fa4 dfba5f18 8056cd50 813a3bf4 ecac8b10 84ed8c00 5f20: dfba5f3c dfba5f30 81a39438 81a39308 dfba5f54 dfba5f40 8025e490 8028ef54 5f40: dfba5fb0 40000000 dfba5f84 dfba5f58 802229ec 8025e44c 00000000 8281cddc 5f60: dfba5fb0 0014c820 ecac8b10 80222940 00000000 69da4fef dfba5fac 00000000 5f80: 00000000 002f6308 00000036 8020029c 84ed8c00 00000036 00000000 dfba5fa8 5fa0: 80200060 8056cc2c 00000000 00000000 00000003 40946400 20000280 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fe00bc 5fe0: 76fdfec0 76fdfeb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813ab46c>] (parport_attach) from [<813a7678>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:841f51c4 r5:81e15824 r4:829cf92c [<813a7570>] (comedi_device_attach) from [<813a31f8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:84ed8c00 r7:20000280 r6:b5403587 r5:841f5180 r4:20000280 [<813a30f8>] (do_devconfig_ioctl) from [<813a41c4>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:84ed8c00 r7:20000280 r6:20000280 r5:841f5180 r4:86c59d80 [<813a3be8>] (comedi_unlocked_ioctl) from [<8056cd50>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3be8>] (comedi_unlocked_ioctl) from [<8056cd50>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3be8>] (comedi_unlocked_ioctl) from [<8056cd50>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3be8>] (comedi_unlocked_ioctl) from [<8056cd50>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:84ed8c00 r9:00000003 r8:86c59d80 r7:20000280 r6:86c59d81 r5:00000000 r4:40946400 [<8056cc20>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfba5fa8 to 0xdfba5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000280 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fe00bc 5fe0: 76fdfec0 76fdfeb0 0001948c 001322c0 r10:00000036 r9:84ed8c00 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