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: 1 UID: 0 PID: 5150 Comm: syz.0.264 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 : [<81408820>] lr : [<81408810>] psr: 60000013 sp : dfcb9d28 ip : dfcb9d28 fp : dfcb9d4c r10: 82b28ad8 r9 : 00000003 r8 : 84505300 r7 : dfcb9d88 r6 : 84505300 r5 : 00000000 r4 : 00000000 r3 : fee00800 r2 : 81e1a2b8 r1 : 00000001 r0 : 81408490 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85dc8dc0 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 84505300 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfcb8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 84505300 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 0xdfcb8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfcb8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.0.264 (pid: 5150, stack limit = 0xdfcb8000) Stack: (0xdfcb9d28 to 0xdfcba000) 9d20: 82432bc0 84505300 829d3f08 829d3f08 81e1a778 84505344 9d40: dfcb9d84 dfcb9d50 814044c8 814086b8 84505330 00000000 dfcb9d74 20000300 9d60: 84505300 b5403587 84505330 85c73c00 40946400 00000003 dfcb9e44 dfcb9d88 9d80: 813ffe20 814043cc 656d6f63 705f6964 6f707261 00007472 00000000 00000800 9da0: 0000001f 00010000 00000004 00000003 00000cc7 00000004 00000010 0000000e 9dc0: 00000006 00000002 00000001 00000007 00000001 00000006 10000105 00000000 9de0: 0001244d 00000003 3fff7fff 00000089 00000010 00000001 20001e58 0080000b 9e00: 00000e6c 0000003c 00000008 00000006 ffffffff effffff8 00000000 d30b8198 9e20: 00000000 85ca6840 84505300 20000300 84505330 85c73c00 dfcb9f14 dfcb9e48 9e40: 81400e14 813ffd2c 00000000 00000000 00000000 00000000 00000000 d30b8198 9e60: 00000000 00000000 824a35ec 0000005f 845b3be8 00000064 8457dd44 85c73c00 9e80: dfcb9ee4 dfcb9e90 807b7d68 807ae28c 00000064 00000001 00000000 dfcb9eac 9ea0: 85de6d90 834eb908 00006400 0000000b dfcb9ea0 00000000 00000000 d30b8198 9ec0: 85ca6840 40946400 20000300 20000300 85ca6840 00000003 dfcb9ef4 dfcb9ee8 9ee0: 807b7e88 d30b8198 dfcb9f14 40946400 00000000 85ca6841 20000300 85ca6840 9f00: 00000003 85c73c00 dfcb9fa4 dfcb9f18 8058552c 81400864 ecac8b10 85c73c00 9f20: dfcb9f3c dfcb9f30 81aaf2bc 81aaf18c dfcb9f54 dfcb9f40 8025bcbc 8028e07c 9f40: dfcb9fb0 40000000 dfcb9f84 dfcb9f58 80221a38 8025bc78 00000000 8281d17c 9f60: dfcb9fb0 0014c880 ecac8b10 8022198c 00000000 d30b8198 dfcb9fac 00000000 9f80: 00000000 00316310 00000036 8020029c 85c73c00 00000036 00000000 dfcb9fa8 9fa0: 80200060 80585408 00000000 00000000 00000003 40946400 20000300 00000000 9fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f040bc 9fe0: 76f03ec0 76f03eb0 0001929c 00132320 60000010 00000003 00000000 00000000 Call trace: [<814086ac>] (parport_attach) from [<814044c8>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:84505344 r5:81e1a778 r4:829d3f08 [<814043c0>] (comedi_device_attach) from [<813ffe20>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:85c73c00 r7:84505330 r6:b5403587 r5:84505300 r4:20000300 [<813ffd20>] (do_devconfig_ioctl) from [<81400e14>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:85c73c00 r7:84505330 r6:20000300 r5:84505300 r4:85ca6840 [<81400858>] (comedi_unlocked_ioctl) from [<8058552c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400858>] (comedi_unlocked_ioctl) from [<8058552c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400858>] (comedi_unlocked_ioctl) from [<8058552c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400858>] (comedi_unlocked_ioctl) from [<8058552c>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85c73c00 r9:00000003 r8:85ca6840 r7:20000300 r6:85ca6841 r5:00000000 r4:40946400 [<805853fc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfcb9fa8 to 0xdfcb9ff0) 9fa0: 00000000 00000000 00000003 40946400 20000300 00000000 9fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f040bc 9fe0: 76f03ec0 76f03eb0 0001929c 00132320 r10:00000036 r9:85c73c00 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