genirq: Flags mismatch irq 25. 00200004 (comedi_parport) vs. 00215204 (timer) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee00cf7 when write [fee00cf7] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 23739 Comm: syz.9.4203 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 : [<813ce498>] lr : [<813ce488>] psr: 60000013 sp : ea485d30 ip : ea485d30 fp : ea485d54 r10: 82b25910 r9 : 00000003 r8 : 841be0c0 r7 : ea485d90 r6 : 841be0c0 r5 : 00000000 r4 : 00000000 r3 : fee00cf7 r2 : 81e177dc r1 : 00000001 r0 : 813ce108 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85ba0100 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 841be0c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea484000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 841be0c0 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 0xea484000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xea484000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.9.4203 (pid: 23739, stack limit = 0xea484000) Stack: (0xea485d30 to 0xea486000) 5d20: 823f12fc 841be0c0 829d1bf4 829d1bf4 5d40: 81e17c9c 841be104 ea485d8c ea485d58 813ca528 813ce330 200000c0 00000000 5d60: ea485d7c 200000c0 841be0c0 b5403587 200000c0 86a4c800 40946400 00000003 5d80: ea485e4c ea485d90 813c6074 813ca42c 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000cf7 00000019 00000001 00000000 00000002 00000cc7 00000008 5dc0: 00000007 0000000a 00000100 00000002 00000001 00000008 01100004 00000006 5de0: 00000009 00000001 0001a449 00000003 40000003 00000089 00000002 00000f27 5e00: 00000006 0000800b 00000008 00000005 00000008 00000008 00010000 fffffff7 5e20: 00000000 7851c6f5 00000000 857a6c00 841be0c0 200000c0 200000c0 86a4c800 5e40: ea485f14 ea485e50 813c7040 813c5f80 00000000 00000000 00000000 7851c6f5 5e60: 00000000 00000000 824625b4 0000005f 83e977f8 841be0f0 841bd09c 86a4c800 5e80: ea485ee4 ea485e90 807a755c 8079d954 00000064 00000001 00000000 ea485eac 5ea0: 84cfcc10 834e3c38 00006400 0000000b ea485ea0 00000000 00000000 7851c6f5 5ec0: 857a6c00 40946400 200000c0 200000c0 857a6c00 00000003 ea485ef4 ea485ee8 5ee0: 807a767c 7851c6f5 ea485f14 40946400 00000000 857a6c01 200000c0 857a6c00 5f00: 00000003 86a4c800 ea485fa4 ea485f18 80578798 813c6a70 ecac8b10 86a4c800 5f20: ea485f3c ea485f30 81a606d8 81a605a8 ea485f54 ea485f40 8025c484 8028d914 5f40: ea485fb0 40000000 ea485f84 ea485f58 802229ec 8025c440 00000000 8281cfb4 5f60: ea485fb0 0014ca70 ecac8b10 80222940 00000000 7851c6f5 ea485fac 00000000 5f80: 00000000 00316308 00000036 8020029c 86a4c800 00000036 00000000 ea485fa8 5fa0: 80200060 80578674 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f930bc 5fe0: 76f92ec0 76f92eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813ce324>] (parport_attach) from [<813ca528>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:841be104 r5:81e17c9c r4:829d1bf4 [<813ca420>] (comedi_device_attach) from [<813c6074>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:86a4c800 r7:200000c0 r6:b5403587 r5:841be0c0 r4:200000c0 [<813c5f74>] (do_devconfig_ioctl) from [<813c7040>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:86a4c800 r7:200000c0 r6:200000c0 r5:841be0c0 r4:857a6c00 [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:86a4c800 r9:00000003 r8:857a6c00 r7:200000c0 r6:857a6c01 r5:00000000 r4:40946400 [<80578668>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea485fa8 to 0xea485ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f930bc 5fe0: 76f92ec0 76f92eb0 000195a4 00132510 r10:00000036 r9:86a4c800 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