genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee08005 when write [fee08005] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4548 Comm: syz.1.219 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 : [<81408728>] lr : [<81408718>] psr: 60000013 sp : dfab9d28 ip : dfab9d28 fp : dfab9d4c r10: 82b28ad8 r9 : 00000003 r8 : 8394b6c0 r7 : dfab9d88 r6 : 8394b6c0 r5 : 00000000 r4 : 00000000 r3 : fee08005 r2 : 81e1a2b8 r1 : 00000001 r0 : 81408398 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85fd7a40 DAC: 00000000 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 8394b6c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfab8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 8394b6c0 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 0xdfab8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfab8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.1.219 (pid: 4548, stack limit = 0xdfab8000) Stack: (0xdfab9d28 to 0xdfaba000) 9d20: 82432b54 8394b6c0 829d3ec8 829d3ec8 81e1a778 8394b704 9d40: dfab9d84 dfab9d50 814043d0 814085c0 8394b6f0 00000000 dfab9d74 200000c0 9d60: 8394b6c0 b5403587 8394b6f0 83ea6c00 40946400 00000003 dfab9e44 dfab9d88 9d80: 813ffd28 814042d4 656d6f63 705f6964 6f707261 00007472 00000000 00008005 9da0: 0000001f 00000001 00000005 00000000 00000cc7 00000008 00000007 0000000d 9dc0: 00000101 00001202 fffffffd 00000005 00000007 00000e05 ffffffff 00000001 9de0: 0001a449 00000003 7d10d6d3 40000089 00000004 00000f27 ffffffff 00000010 9e00: 00000001 00000007 0000fffc 00000002 00010000 fffffff6 00000000 9169a363 9e20: 00000000 86281780 8394b6c0 200000c0 8394b6f0 83ea6c00 dfab9f14 dfab9e48 9e40: 81400d1c 813ffc34 00000000 00000000 00000000 00000000 00000000 9169a363 9e60: 00000000 00000000 824a35ec 0000005f 84141be8 00000064 845bd36c 83ea6c00 9e80: dfab9ee4 dfab9e90 807b7cb0 807ae1d4 00000064 00000001 00000000 dfab9eac 9ea0: 85f5e490 8343c6e8 00006400 0000000b dfab9ea0 00000000 00000000 9169a363 9ec0: 86281780 40946400 200000c0 200000c0 86281780 00000003 dfab9ef4 dfab9ee8 9ee0: 807b7dd0 9169a363 dfab9f14 40946400 00000000 86281781 200000c0 86281780 9f00: 00000003 83ea6c00 dfab9fa4 dfab9f18 80585514 8140076c ecac8b10 83ea6c00 9f20: dfab9f3c dfab9f30 81aaeebc 81aaed8c dfab9f54 dfab9f40 8025bcbc 8028e07c 9f40: dfab9fb0 40000000 dfab9f84 dfab9f58 80221a38 8025bc78 00000000 8281d13c 9f60: dfab9fb0 0014c880 ecac8b10 8022198c 00000000 9169a363 dfab9fac 00000000 9f80: 00000000 00316310 00000036 8020029c 83ea6c00 00000036 00000000 dfab9fa8 9fa0: 80200060 805853f0 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f700bc 9fe0: 76f6fec0 76f6feb0 0001929c 00132320 60000010 00000003 00000000 00000000 Call trace: [<814085b4>] (parport_attach) from [<814043d0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:8394b704 r5:81e1a778 r4:829d3ec8 [<814042c8>] (comedi_device_attach) from [<813ffd28>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:83ea6c00 r7:8394b6f0 r6:b5403587 r5:8394b6c0 r4:200000c0 [<813ffc28>] (do_devconfig_ioctl) from [<81400d1c>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:83ea6c00 r7:8394b6f0 r6:200000c0 r5:8394b6c0 r4:86281780 [<81400760>] (comedi_unlocked_ioctl) from [<80585514>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400760>] (comedi_unlocked_ioctl) from [<80585514>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400760>] (comedi_unlocked_ioctl) from [<80585514>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400760>] (comedi_unlocked_ioctl) from [<80585514>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83ea6c00 r9:00000003 r8:86281780 r7:200000c0 r6:86281781 r5:00000000 r4:40946400 [<805853e4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfab9fa8 to 0xdfab9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f700bc 9fe0: 76f6fec0 76f6feb0 0001929c 00132320 r10:00000036 r9:83ea6c00 r8:8020029c r7:00000036 r6:00316310 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