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: 4977 Comm: syz.0.325 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 : [<813cec90>] lr : [<813cec80>] psr: 60000013 sp : e8209d30 ip : e8209d30 fp : e8209d54 r10: 82b25910 r9 : 00000003 r8 : 840c4840 r7 : e8209d90 r6 : 840c4840 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1773c r1 : 00000001 r0 : 813ce900 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8b08ec40 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 840c4840 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe8208000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 840c4840 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 0xe8208000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xe8208000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.0.325 (pid: 4977, stack limit = 0xe8208000) Stack: (0xe8209d30 to 0xe820a000) 9d20: 823f1538 840c4840 829d1c34 829d1c34 9d40: 81e17bfc 840c4884 e8209d8c e8209d58 813cad1c 813ceb28 200000c0 00000000 9d60: e8209d7c 200000c0 840c4840 b5403587 200000c0 841a6000 40946400 00000003 9d80: e8209e4c e8209d90 813c6868 813cac20 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004f27 0000001f 00010000 00000004 00000005 00000cc7 00000008 9dc0: 00000007 0000000a 00000100 00000002 00000001 00000002 00000001 00000006 9de0: 00000101 00000000 0001a449 00000003 40000003 00000089 0000caa7 00000000 9e00: 20001e58 0000000b 00000e69 0000003c 00000008 00000006 00000000 fffffff8 9e20: 00000000 9b84dacd 00000000 85501840 840c4840 200000c0 200000c0 841a6000 9e40: e8209f14 e8209e50 813c7834 813c6774 00000000 00000000 00000000 9b84dacd 9e60: 00000000 00000000 824625b4 0000005f 83f4a838 840c4870 8424551c 841a6000 9e80: e8209ee4 e8209e90 807a7df4 8079e1ec 00000064 00000001 00000000 e8209eac 9ea0: 85a66cd0 834eb550 00006400 0000000b e8209ea0 00000000 00000000 9b84dacd 9ec0: 85501840 40946400 200000c0 200000c0 85501840 00000003 e8209ef4 e8209ee8 9ee0: 807a7f14 9b84dacd e8209f14 40946400 00000000 85501841 200000c0 85501840 9f00: 00000003 841a6000 e8209fa4 e8209f18 80578f58 813c7264 ecac8b10 841a6000 9f20: e8209f3c e8209f30 81a61380 81a61250 e8209f54 e8209f40 8025c484 8028d914 9f40: e8209fb0 40000000 e8209f84 e8209f58 802229ec 8025c440 00000000 8281cfb4 9f60: e8209fb0 0014ced0 ecac8b10 80222940 00000000 9b84dacd e8209fac 00000000 9f80: 00000000 00316308 00000036 8020029c 841a6000 00000036 00000000 e8209fa8 9fa0: 80200060 80578e34 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f700bc 9fe0: 76f6fec0 76f6feb0 00019294 00132970 60000010 00000003 00000000 00000000 Call trace: [<813ceb1c>] (parport_attach) from [<813cad1c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:840c4884 r5:81e17bfc r4:829d1c34 [<813cac14>] (comedi_device_attach) from [<813c6868>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:841a6000 r7:200000c0 r6:b5403587 r5:840c4840 r4:200000c0 [<813c6768>] (do_devconfig_ioctl) from [<813c7834>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:841a6000 r7:200000c0 r6:200000c0 r5:840c4840 r4:85501840 [<813c7258>] (comedi_unlocked_ioctl) from [<80578f58>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c7258>] (comedi_unlocked_ioctl) from [<80578f58>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c7258>] (comedi_unlocked_ioctl) from [<80578f58>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c7258>] (comedi_unlocked_ioctl) from [<80578f58>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:841a6000 r9:00000003 r8:85501840 r7:200000c0 r6:85501841 r5:00000000 r4:40946400 [<80578e28>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe8209fa8 to 0xe8209ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f700bc 9fe0: 76f6fec0 76f6feb0 00019294 00132970 r10:00000036 r9:841a6000 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