genirq: Flags mismatch irq 32. 00200001 (comedi_parport) vs. 00200081 (virtio1) 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: 5191 Comm: syz.0.299 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 : [<813c67b8>] lr : [<813c67a8>] psr: 60000013 sp : df969d30 ip : df969d30 fp : df969d54 r10: 82b21f28 r9 : 00000003 r8 : 841b1900 r7 : df969d90 r6 : 841b1900 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e16f9c r1 : 00000001 r0 : 813c6428 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85c14e40 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 841b1900 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf968000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 841b1900 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 0xdf968000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdf968000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.0.299 (pid: 5191, stack limit = 0xdf968000) Stack: (0xdf969d30 to 0xdf96a000) 9d20: 8240199c 841b1900 829cfeac 829cfeac 9d40: 81e1745c 841b1944 df969d8c df969d58 813c2844 813c6650 200000c0 00000000 9d60: df969d7c 200000c0 841b1900 b5403587 200000c0 84f2bc00 40946400 00000003 9d80: df969e4c df969d90 813be390 813c2748 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004f27 00000020 00000007 00000000 00000001 0000800c 00000012 9dc0: 00000004 0000000d 00000003 00000002 00000002 fffffffe 00000001 00000002 9de0: 00000101 00000004 00000005 00400003 0000352f 00000099 0000caa7 00000080 9e00: 20001e58 00000007 02000e67 0000003c 00000008 fffffffe 00000000 fffffff8 9e20: 00000000 02136270 00000000 85b1ad80 841b1900 200000c0 200000c0 84f2bc00 9e40: df969f14 df969e50 813bf35c 813be29c 00000000 00000000 00000000 02136270 9e60: 00000000 00000000 824745b4 0000005f 83faa250 841b1930 83b61a2c 84f2bc00 9e80: df969ee4 df969e90 807a9ea4 807a029c 00000064 00000001 00000000 df969eac 9ea0: 858d5490 834d1b28 00006400 0000000b df969ea0 00000000 00000000 02136270 9ec0: 85b1ad80 40946400 200000c0 200000c0 85b1ad80 00000003 df969ef4 df969ee8 9ee0: 807a9fc4 02136270 df969f14 40946400 00000000 85b1ad81 200000c0 85b1ad80 9f00: 00000003 84f2bc00 df969fa4 df969f18 8057bc70 813bed8c ecac8b10 84f2bc00 9f20: df969f3c df969f30 81a3b078 81a3af48 df969f54 df969f40 8025c478 8028d90c 9f40: df969fb0 40000000 df969f84 df969f58 802229ec 8025c434 00000000 8281ccf4 9f60: df969fb0 0014ca70 ecac8b10 80222940 00000000 02136270 df969fac 00000000 9f80: 00000000 00316308 00000036 8020029c 84f2bc00 00000036 00000000 df969fa8 9fa0: 80200060 8057bb4c 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fb90bc 9fe0: 76fb8ec0 76fb8eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813c6644>] (parport_attach) from [<813c2844>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:841b1944 r5:81e1745c r4:829cfeac [<813c273c>] (comedi_device_attach) from [<813be390>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:84f2bc00 r7:200000c0 r6:b5403587 r5:841b1900 r4:200000c0 [<813be290>] (do_devconfig_ioctl) from [<813bf35c>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:84f2bc00 r7:200000c0 r6:200000c0 r5:841b1900 r4:85b1ad80 [<813bed80>] (comedi_unlocked_ioctl) from [<8057bc70>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813bed80>] (comedi_unlocked_ioctl) from [<8057bc70>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813bed80>] (comedi_unlocked_ioctl) from [<8057bc70>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813bed80>] (comedi_unlocked_ioctl) from [<8057bc70>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:84f2bc00 r9:00000003 r8:85b1ad80 r7:200000c0 r6:85b1ad81 r5:00000000 r4:40946400 [<8057bb40>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf969fa8 to 0xdf969ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fb90bc 9fe0: 76fb8ec0 76fb8eb0 000195a4 00132510 r10:00000036 r9:84f2bc00 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