genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee00800 when write [fee00800] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 7460 Comm: syz.1.927 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 : [<814013b4>] lr : [<814013a4>] psr: 60000013 sp : e028dd30 ip : e028dd30 fp : e028dd54 r10: 82b29b30 r9 : 00000003 r8 : 84589f00 r7 : e028dd90 r6 : 84589f00 r5 : 00000000 r4 : 00000000 r3 : fee00800 r2 : 81e24f44 r1 : 00000001 r0 : 81401024 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8606af40 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 84589f00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe028c000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 84589f00 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 0xe028c000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xe028c000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Process syz.1.927 (pid: 7460, stack limit = 0xe028c000) Stack: (0xe028dd30 to 0xe028e000) dd20: 8243d118 84589f00 829d4280 829d4280 dd40: 81e25404 00000000 e028dd8c e028dd58 813fcfe0 8140124c 40946400 00000000 dd60: e028dd7c 20000300 84589f00 b5403587 40946400 85af6000 00000003 84589f30 dd80: e028de4c e028dd90 813f8918 813fcee0 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00000800 0000001f 00010000 00000004 00000003 00000cc7 00000004 ddc0: 00000010 0000000e 00000006 00000002 00000002 00000007 00000001 00000006 dde0: 10000105 00000000 0001244d 00000003 3fff7fff 00000089 00000010 00000001 de00: 20001e58 0080000b 00000e6c 00000008 00000008 00000006 ffffffff effffff8 de20: 00000000 d5efd63a 00000000 859d3240 84589f00 20000300 40946400 85af6000 de40: e028df14 e028de50 813f9498 813f8850 00000000 d5efd63a 00000000 00000000 de60: 824b15ec e028dea4 0000005f 840cae20 00000064 845c72dc e028dee4 e028de88 de80: 807b4124 807aa7a0 00000064 00000001 00000000 e028dea4 85ce96d0 834f0000 dea0: 00006400 0000000b e028de98 00000000 00000000 d5efd63a 00000000 859d3240 dec0: 40946400 20000300 20000300 859d3240 0000000c 85af6000 e028def4 e028dee8 dee0: 807b4254 d5efd63a e028df14 00000000 859d3241 40946400 20000300 859d3240 df00: 0000000c 85af6000 e028dfa4 e028df18 805821a4 813f93a0 ecac8b10 85af6000 df20: e028df3c e028df30 81aa6e78 81aa6d48 e028df54 e028df40 8025ba7c 8028ef68 df40: e028dfb0 40000000 e028df84 e028df58 80221a54 8025ba38 00000000 8281cf7c df60: e028dfb0 0013ddc0 ecac8b10 802219a8 00000000 d5efd63a e028dfac 00000000 df80: 00000000 00346450 00000036 8020029c 85af6000 00000036 00000000 e028dfa8 dfa0: 80200060 80581f6c 00000000 00000000 0000000c 40946400 20000300 00000000 dfc0: 00000000 00000000 00346450 00000036 00346418 00000000 00000001 76f5e0dc dfe0: 76f5de88 76f5de78 00018734 0012fc20 60000010 0000000c 00000000 00000000 Call trace: [<81401240>] (parport_attach) from [<813fcfe0>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e25404 r4:829d4280 [<813fced4>] (comedi_device_attach) from [<813f8918>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:84589f30 r9:00000003 r8:85af6000 r7:40946400 r6:b5403587 r5:84589f00 r4:20000300 [<813f8844>] (do_devconfig_ioctl) from [<813f9498>] (comedi_unlocked_ioctl+0x104/0x1c80 drivers/comedi/comedi_fops.c:2240) r8:85af6000 r7:40946400 r6:20000300 r5:84589f00 r4:859d3240 [<813f9394>] (comedi_unlocked_ioctl) from [<805821a4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813f9394>] (comedi_unlocked_ioctl) from [<805821a4>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813f9394>] (comedi_unlocked_ioctl) from [<805821a4>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813f9394>] (comedi_unlocked_ioctl) from [<805821a4>] (sys_ioctl+0x244/0xb58 fs/ioctl.c:583) r10:85af6000 r9:0000000c r8:859d3240 r7:20000300 r6:40946400 r5:859d3241 r4:00000000 [<80581f60>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe028dfa8 to 0xe028dff0) dfa0: 00000000 00000000 0000000c 40946400 20000300 00000000 dfc0: 00000000 00000000 00346450 00000036 00346418 00000000 00000001 76f5e0dc dfe0: 76f5de88 76f5de78 00018734 0012fc20 r10:00000036 r9:85af6000 r8:8020029c r7:00000036 r6:00346450 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