8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2c when write [fee04f2c] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4619 Comm: syz.0.235 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 subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] PC is at subdev_8255_io+0x60/0x6c drivers/comedi/drivers/comedi_8255.c:43 LR is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] LR is at subdev_8255_io+0x4c/0x6c drivers/comedi/drivers/comedi_8255.c:43 pc : [<813dbdc8>] lr : [<813dbdb4>] psr: 60000013 sp : e0065cb8 ip : e0065cb8 fp : e0065cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f29 r6 : 0000009b r5 : 84167e40 r4 : 00004f2c r3 : 0000009b r2 : fee04f2c r1 : 00000001 r0 : 84167e40 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85947800 DAC: 00000000 Register r0 information: slab kmalloc-192 start 84167e40 pointer offset 0 size 192 Register r1 information: non-paged memory Register r2 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 84167e40 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: non-paged memory Register r9 information: NULL pointer Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xe0064000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xe0064000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.0.235 (pid: 4619, stack limit = 0xe0064000) Stack: (0xe0065cb8 to 0xe0066000) 5ca0: 813dbd68 84167e40 5cc0: 00004f29 00004f29 e0065cf4 e0065cd8 813dbaa0 813dbd74 00004f29 8050a85c 5ce0: 857ba400 857ba400 e0065d14 e0065cf8 813dbe60 813dba54 857ba400 84167e40 5d00: e0065da4 00004f29 e0065d54 e0065d18 813dc054 813dbde0 82af1fe0 841fb000 5d20: 828215f0 00000000 00000000 829d23cc 84167e40 84167e84 e0065d90 84167e40 5d40: 00000000 82b25910 e0065d8c e0065d58 813caf4c 813dbfa4 200000c0 00000000 5d60: e0065d7c 200000c0 84167e40 b5403587 200000c0 83a9bc00 40946400 00000003 5d80: e0065e4c e0065d90 813c6a98 813cae50 35353238 00000000 00000000 00000000 5da0: 00000000 00004f29 00000005 00000003 00000004 00000001 0000000c 00000000 5dc0: 00000004 00000081 fffffffc 00000002 fffffffe 00000001 00000001 00000002 5de0: 00000101 00000008 00400009 00000003 00000005 00000099 0000caa7 00000080 5e00: 00000000 00000007 02000e67 0000003c 00000008 fffffffe 00000000 00000004 5e20: 00000000 79a03139 00000000 84bbe540 84167e40 200000c0 200000c0 83a9bc00 5e40: e0065f14 e0065e50 813c7a64 813c69a4 00000000 00000000 00000000 79a03139 5e60: 00000000 00000000 824625b4 0000005f 83ed4640 84167e70 84113dd4 83a9bc00 5e80: e0065ee4 e0065e90 807a7a88 8079e1d4 00000064 00000001 00000000 e0065eac 5ea0: 8593b3d0 834f1e58 00006400 0000000b e0065ea0 00000000 00000000 79a03139 5ec0: 84bbe540 40946400 200000c0 200000c0 84bbe540 00000003 e0065ef4 e0065ee8 5ee0: 807a7ba8 79a03139 e0065f14 40946400 00000000 84bbe541 200000c0 84bbe540 5f00: 00000003 83a9bc00 e0065fa4 e0065f18 80578f40 813c7494 ecac8b10 83a9bc00 5f20: e0065f3c e0065f30 81a618c0 81a61790 e0065f54 e0065f40 8025c484 8028d914 5f40: e0065fb0 40000000 e0065f84 e0065f58 802229ec 8025c440 00000000 8281cfb4 5f60: e0065fb0 0014cf70 ecac8b10 80222940 00000000 79a03139 e0065fac 00000000 5f80: 00000000 00316308 00000036 8020029c 83a9bc00 00000036 00000000 e0065fa8 5fa0: 80200060 80578e1c 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f0d0bc 5fe0: 76f0cec0 76f0ceb0 00019294 00132a10 60000010 00000003 00000000 00000000 Call trace: [<813dbd68>] (subdev_8255_io) from [<813dbaa0>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f29 r6:00004f29 r5:84167e40 r4:813dbd68 [<813dba48>] (subdev_8255_do_config) from [<813dbe60>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813dba48>] (subdev_8255_do_config) from [<813dbe60>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:857ba400 [<813dbdd4>] (subdev_8255_io_init) from [<813dc054>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813dbdd4>] (subdev_8255_io_init) from [<813dc054>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f29 r6:e0065da4 r5:84167e40 r4:857ba400 [<813dbf98>] (dev_8255_attach) from [<813caf4c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:84167e40 r7:e0065d90 r6:84167e84 r5:84167e40 r4:829d23cc [<813cae44>] (comedi_device_attach) from [<813c6a98>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83a9bc00 r7:200000c0 r6:b5403587 r5:84167e40 r4:200000c0 [<813c6998>] (do_devconfig_ioctl) from [<813c7a64>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83a9bc00 r7:200000c0 r6:200000c0 r5:84167e40 r4:84bbe540 [<813c7488>] (comedi_unlocked_ioctl) from [<80578f40>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c7488>] (comedi_unlocked_ioctl) from [<80578f40>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c7488>] (comedi_unlocked_ioctl) from [<80578f40>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c7488>] (comedi_unlocked_ioctl) from [<80578f40>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83a9bc00 r9:00000003 r8:84bbe540 r7:200000c0 r6:84bbe541 r5:00000000 r4:40946400 [<80578e10>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0065fa8 to 0xe0065ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f0d0bc 5fe0: 76f0cec0 76f0ceb0 00019294 00132a10 r10:00000036 r9:83a9bc00 r8:8020029c r7:00000036 r6:00316308 r5:00000000 r4:00000000 Code: e6ef3076 e0842002 e7f32052 e2422612 (e5c23000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e6ef3076 uxtb r3, r6 4: e0842002 add r2, r4, r2 8: e7f32052 ubfx r2, r2, #0, #20 c: e2422612 sub r2, r2, #18874368 @ 0x1200000 * 10: e5c23000 strb r3, [r2] <-- trapping instruction