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: 0 UID: 0 PID: 6601 Comm: syz.1.759 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 : [<81408d38>] lr : [<81408d28>] psr: 600f0013 sp : df9e5d28 ip : df9e5d28 fp : df9e5d4c r10: 82b28ad8 r9 : 00000003 r8 : 84580d80 r7 : df9e5d88 r6 : 84580d80 r5 : 00000000 r4 : 00000000 r3 : fee00800 r2 : 81e1a2b8 r1 : 00000001 r0 : 814089a8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8635c500 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 84580d80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf9e4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 84580d80 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 0xdf9e4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdf9e4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.1.759 (pid: 6601, stack limit = 0xdf9e4000) Stack: (0xdf9e5d28 to 0xdf9e6000) 5d20: 82432e8c 84580d80 829d3f08 829d3f08 81e1a778 84580dc4 5d40: df9e5d84 df9e5d50 814049e0 81408bd0 84580db0 00000000 df9e5d74 20000300 5d60: 84580d80 b5403587 84580db0 84606c00 40946400 00000003 df9e5e44 df9e5d88 5d80: 81400338 814048e4 656d6f63 705f6964 6f707261 00007472 00000000 00000800 5da0: 0000001f 00010000 00000004 00000003 00000cc7 00000004 00000010 0000000e 5dc0: 00000006 00000002 00000002 00000007 00000001 00000006 10000105 00000000 5de0: 0001244d 00000003 3fff7fff 00000089 00000010 00000001 20001e58 0080000b 5e00: 00000e6c 00000008 00000008 00000006 ffffffff effffff8 00000000 06b0755b 5e20: 00000000 84667f00 84580d80 20000300 84580db0 84606c00 df9e5f14 df9e5e48 5e40: 8140132c 81400244 00000000 00000000 00000000 00000000 00000000 06b0755b 5e60: 00000000 00000000 824a35ec 0000005f 8400aa30 00000064 8435ecfc 84606c00 5e80: df9e5ee4 df9e5e90 807b7f80 807ae4a4 00000064 00000001 00000000 df9e5eac 5ea0: 85151e50 834ec5d8 00006400 0000000b df9e5ea0 00000000 00000000 06b0755b 5ec0: 84667f00 40946400 20000300 20000300 84667f00 00000003 df9e5ef4 df9e5ee8 5ee0: 807b80a0 06b0755b df9e5f14 40946400 00000000 84667f01 20000300 84667f00 5f00: 00000003 84606c00 df9e5fa4 df9e5f18 80585608 81400d7c ecac8b10 84606c00 5f20: df9e5f3c df9e5f30 81aaf9ac 81aaf87c df9e5f54 df9e5f40 8025bcbc 8028e0c4 5f40: df9e5fb0 40000000 df9e5f84 df9e5f58 80221a38 8025bc78 00000000 8281d17c 5f60: df9e5fb0 0014c8c0 ecac8b10 8022198c 00000000 06b0755b df9e5fac 00000000 5f80: 00000000 00326310 00000036 8020029c 84606c00 00000036 00000000 df9e5fa8 5fa0: 80200060 805854e4 00000000 00000000 00000003 40946400 20000300 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f1c0bc 5fe0: 76f1bec0 76f1beb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<81408bc4>] (parport_attach) from [<814049e0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:84580dc4 r5:81e1a778 r4:829d3f08 [<814048d8>] (comedi_device_attach) from [<81400338>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:84606c00 r7:84580db0 r6:b5403587 r5:84580d80 r4:20000300 [<81400238>] (do_devconfig_ioctl) from [<8140132c>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:84606c00 r7:84580db0 r6:20000300 r5:84580d80 r4:84667f00 [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:84606c00 r9:00000003 r8:84667f00 r7:20000300 r6:84667f01 r5:00000000 r4:40946400 [<805854d8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9e5fa8 to 0xdf9e5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000300 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f1c0bc 5fe0: 76f1bec0 76f1beb0 000192bc 00132360 r10:00000036 r9:84606c00 r8:8020029c r7:00000036 r6:00326310 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