genirq: Flags mismatch irq 25. 00200004 (comedi_parport) vs. 00215204 (timer) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee08001 when write [fee08001] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 12387 Comm: syz.2.2266 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 : [<813ce670>] lr : [<813ce660>] psr: 60000013 sp : df9d9d30 ip : df9d9d30 fp : df9d9d54 r10: 82b25910 r9 : 00000003 r8 : 84176a80 r7 : df9d9d90 r6 : 84176a80 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e177dc r1 : 00000001 r0 : 813ce2e0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8497bcc0 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 84176a80 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 84176a80 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.2.2266 (pid: 12387, stack limit = 0xdf9d8000) Stack: (0xdf9d9d30 to 0xdf9da000) 9d20: 823f13b8 84176a80 829d1bf4 829d1bf4 9d40: 81e17c9c 84176ac4 df9d9d8c df9d9d58 813ca700 813ce508 200000c0 00000000 9d60: df9d9d7c 200000c0 84176a80 b5403587 200000c0 83b12400 40946400 00000003 9d80: df9d9e4c df9d9d90 813c624c 813ca604 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00008001 00000019 00000001 00000000 00000002 00000cc7 00000008 9dc0: 00000007 0000000a 00000100 00000002 00000001 00000008 01100004 00000006 9de0: 00000009 00000001 0001a449 00000003 40000003 00000089 00000002 00000f27 9e00: 00000006 0000800b 00000008 00000005 00000008 00000008 00010000 fffffff7 9e20: 00000000 31d0a42a 00000000 84882cc0 84176a80 200000c0 200000c0 83b12400 9e40: df9d9f14 df9d9e50 813c7218 813c6158 00000000 00000000 00000000 31d0a42a 9e60: 00000000 00000000 824625b4 0000005f 83c5f9f0 84176ab0 8418fd44 83b12400 9e80: df9d9ee4 df9d9e90 807a766c 8079da64 00000064 00000001 00000000 df9d9eac 9ea0: 85846e50 83431440 00006400 0000000b df9d9ea0 00000000 00000000 31d0a42a 9ec0: 84882cc0 40946400 200000c0 200000c0 84882cc0 00000004 df9d9ef4 df9d9ee8 9ee0: 807a778c 31d0a42a df9d9f14 40946400 00000000 84882cc1 200000c0 84882cc0 9f00: 00000004 83b12400 df9d9fa4 df9d9f18 805788a0 813c6c48 ecac8b10 83b12400 9f20: df9d9f3c df9d9f30 81a60af8 81a609c8 df9d9f54 df9d9f40 8025c484 8028d914 9f40: df9d9fb0 40000000 df9d9f84 df9d9f58 802229ec 8025c440 00000000 8281cfb4 9f60: df9d9fb0 0014ca70 ecac8b10 80222940 00000000 31d0a42a df9d9fac 00000000 9f80: 00000000 00316308 00000036 8020029c 83b12400 00000036 00000000 df9d9fa8 9fa0: 80200060 8057877c 00000000 00000000 00000004 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f360bc 9fe0: 76f35ec0 76f35eb0 000195a4 00132510 60000010 00000004 00000000 00000000 Call trace: [<813ce4fc>] (parport_attach) from [<813ca700>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:84176ac4 r5:81e17c9c r4:829d1bf4 [<813ca5f8>] (comedi_device_attach) from [<813c624c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83b12400 r7:200000c0 r6:b5403587 r5:84176a80 r4:200000c0 [<813c614c>] (do_devconfig_ioctl) from [<813c7218>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83b12400 r7:200000c0 r6:200000c0 r5:84176a80 r4:84882cc0 [<813c6c3c>] (comedi_unlocked_ioctl) from [<805788a0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6c3c>] (comedi_unlocked_ioctl) from [<805788a0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6c3c>] (comedi_unlocked_ioctl) from [<805788a0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6c3c>] (comedi_unlocked_ioctl) from [<805788a0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83b12400 r9:00000004 r8:84882cc0 r7:200000c0 r6:84882cc1 r5:00000000 r4:40946400 [<80578770>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9d9fa8 to 0xdf9d9ff0) 9fa0: 00000000 00000000 00000004 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f360bc 9fe0: 76f35ec0 76f35eb0 000195a4 00132510 r10:00000036 r9:83b12400 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