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: 1 UID: 0 PID: 6667 Comm: syz.0.737 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 : [<813cbd20>] lr : [<813cbd10>] psr: 60000013 sp : df9d9d30 ip : df9d9d30 fp : df9d9d54 r10: 82b24908 r9 : 00000003 r8 : 840a5c00 r7 : df9d9d90 r6 : 840a5c00 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1767c r1 : 00000001 r0 : 813cb990 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 849286c0 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 840a5c00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf9d8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 840a5c00 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 0xdf9d8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdf9d8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.0.737 (pid: 6667, stack limit = 0xdf9d8000) Stack: (0xdf9d9d30 to 0xdf9da000) 9d20: 823ecd94 840a5c00 829d1b74 829d1b74 9d40: 81e17b3c 840a5c44 df9d9d8c df9d9d58 813c7db0 813cbbb8 200000c0 00000000 9d60: df9d9d7c 200000c0 840a5c00 b5403587 200000c0 85720c00 40946400 00000003 9d80: df9d9e4c df9d9d90 813c38fc 813c7cb4 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004f27 0000001f 00010000 00000004 00000003 00000cc7 00000004 9dc0: 00080008 0000000e 00000006 00000002 00000001 00000007 00000001 00000006 9de0: 10000105 00000000 0001a44d 00000003 3fff7fff 00000089 00000010 00000001 9e00: 20001e58 0080000b 00000e69 0000003c 00000008 00000006 ffffffff effffff8 9e20: 00000000 5174f484 00000000 83918000 840a5c00 200000c0 200000c0 85720c00 9e40: df9d9f14 df9d9e50 813c48c8 813c3808 00000000 00000000 00000000 5174f484 9e60: 00000000 00000000 8245d5b4 0000005f 83cd2640 840a5c30 841955f4 85720c00 9e80: df9d9ee4 df9d9e90 807a6324 8079c71c 00000064 00000001 00000000 df9d9eac 9ea0: 857d9d90 8342f088 00006400 0000000b df9d9ea0 00000000 00000000 5174f484 9ec0: 83918000 40946400 200000c0 200000c0 83918000 00000003 df9d9ef4 df9d9ee8 9ee0: 807a6444 5174f484 df9d9f14 40946400 00000000 83918001 200000c0 83918000 9f00: 00000003 85720c00 df9d9fa4 df9d9f18 80578048 813c42f8 ecac8b10 85720c00 9f20: df9d9f3c df9d9f30 81a36e58 81a36d28 df9d9f54 df9d9f40 8025c478 8028d90c 9f40: df9d9fb0 40000000 df9d9f84 df9d9f58 802229ec 8025c434 00000000 8281cf74 9f60: df9d9fb0 0014ca70 ecac8b10 80222940 00000000 5174f484 df9d9fac 00000000 9f80: 00000000 00316448 00000036 8020029c 85720c00 00000036 00000000 df9d9fa8 9fa0: 80200060 80577f24 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f5e0bc 9fe0: 76f5dec0 76f5deb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813cbbac>] (parport_attach) from [<813c7db0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:840a5c44 r5:81e17b3c r4:829d1b74 [<813c7ca8>] (comedi_device_attach) from [<813c38fc>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85720c00 r7:200000c0 r6:b5403587 r5:840a5c00 r4:200000c0 [<813c37fc>] (do_devconfig_ioctl) from [<813c48c8>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:85720c00 r7:200000c0 r6:200000c0 r5:840a5c00 r4:83918000 [<813c42ec>] (comedi_unlocked_ioctl) from [<80578048>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c42ec>] (comedi_unlocked_ioctl) from [<80578048>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c42ec>] (comedi_unlocked_ioctl) from [<80578048>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c42ec>] (comedi_unlocked_ioctl) from [<80578048>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85720c00 r9:00000003 r8:83918000 r7:200000c0 r6:83918001 r5:00000000 r4:40946400 [<80577f18>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9d9fa8 to 0xdf9d9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f5e0bc 9fe0: 76f5dec0 76f5deb0 000195a4 00132510 r10:00000036 r9:85720c00 r8:8020029c r7:00000036 r6:00316448 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