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: 12486 Comm: syz.9.1617 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 : [<813ce990>] lr : [<813ce980>] psr: 60000013 sp : dfaf9d30 ip : dfaf9d30 fp : dfaf9d54 r10: 82b25910 r9 : 00000003 r8 : 840fca80 r7 : dfaf9d90 r6 : 840fca80 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e1773c r1 : 00000001 r0 : 813ce600 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 848e6680 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 840fca80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfaf8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 840fca80 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 0xdfaf8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfaf8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.9.1617 (pid: 12486, stack limit = 0xdfaf8000) Stack: (0xdfaf9d30 to 0xdfafa000) 9d20: dfaf9d4c dfaf9d40 829d1c34 829d1c34 9d40: 81e17bfc 840fcac4 dfaf9d8c dfaf9d58 813caa20 813ce828 200000c0 00000000 9d60: dfaf9d7c 200000c0 840fca80 b5403587 200000c0 8d31c800 40946400 00000003 9d80: dfaf9e4c dfaf9d90 813c656c 813ca924 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00008001 00000000 ffffffff 00000000 00000000 00000cc7 00000008 9dc0: 00000007 0000000a 00000100 00001002 00000001 00000008 00000004 00000006 9de0: ffffffff 00000001 0001a449 00000001 40000003 00000089 00000002 00000f27 9e00: 00000006 00000007 00000008 7fffffff 00000008 00000004 00010001 fffffff8 9e20: 00000000 c36d7913 00000000 84d45c00 840fca80 200000c0 200000c0 8d31c800 9e40: dfaf9f14 dfaf9e50 813c7538 813c6478 00000000 00000000 00000000 c36d7913 9e60: 00000000 00000000 824625b4 0000005f 84059408 840fcab0 83e54d8c 8d31c800 9e80: dfaf9ee4 dfaf9e90 807a7cbc 8079e0b4 00000064 00000001 00000000 dfaf9eac 9ea0: 867f4cd0 834df110 00006400 0000000b dfaf9ea0 00000000 00000000 c36d7913 9ec0: 84d45c00 40946400 200000c0 200000c0 84d45c00 00000003 dfaf9ef4 dfaf9ee8 9ee0: 807a7ddc c36d7913 dfaf9f14 40946400 00000000 84d45c01 200000c0 84d45c00 9f00: 00000003 8d31c800 dfaf9fa4 dfaf9f18 80578ee0 813c6f68 ecac8b10 8d31c800 9f20: dfaf9f3c dfaf9f30 81a60dc0 81a60c90 dfaf9f54 dfaf9f40 8025c484 8028d914 9f40: dfaf9fb0 40000000 dfaf9f84 dfaf9f58 802229ec 8025c440 00000000 8281cfb4 9f60: dfaf9fb0 0014ced0 ecac8b10 80222940 00000000 c36d7913 dfaf9fac 00000000 9f80: 00000000 00316308 00000036 8020029c 8d31c800 00000036 00000000 dfaf9fa8 9fa0: 80200060 80578dbc 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76ff70bc 9fe0: 76ff6ec0 76ff6eb0 0001928c 00132970 60000010 00000003 00000000 00000000 Call trace: [<813ce81c>] (parport_attach) from [<813caa20>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:840fcac4 r5:81e17bfc r4:829d1c34 [<813ca918>] (comedi_device_attach) from [<813c656c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:8d31c800 r7:200000c0 r6:b5403587 r5:840fca80 r4:200000c0 [<813c646c>] (do_devconfig_ioctl) from [<813c7538>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:8d31c800 r7:200000c0 r6:200000c0 r5:840fca80 r4:84d45c00 [<813c6f5c>] (comedi_unlocked_ioctl) from [<80578ee0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6f5c>] (comedi_unlocked_ioctl) from [<80578ee0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6f5c>] (comedi_unlocked_ioctl) from [<80578ee0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6f5c>] (comedi_unlocked_ioctl) from [<80578ee0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:8d31c800 r9:00000003 r8:84d45c00 r7:200000c0 r6:84d45c01 r5:00000000 r4:40946400 [<80578db0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfaf9fa8 to 0xdfaf9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76ff70bc 9fe0: 76ff6ec0 76ff6eb0 0001928c 00132970 r10:00000036 r9:8d31c800 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