8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2a when write [fee04f2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6668 Comm: syz.2.615 Not tainted 6.17.0-rc1-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 : [<813b83e8>] lr : [<813b83d4>] psr: 60000013 sp : df9e1cb8 ip : df9e1cb8 fp : df9e1cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 841aaa80 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 841aaa80 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85be08c0 DAC: 00000000 Register r0 information: slab kmalloc-192 start 841aaa80 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 841aaa80 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 0xdf9e0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdf9e0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.2.615 (pid: 6668, stack limit = 0xdf9e0000) Stack: (0xdf9e1cb8 to 0xdf9e2000) 1ca0: 813b8388 841aaa80 1cc0: 00004f27 00004f27 df9e1cf4 df9e1cd8 813b80c0 813b8394 00004f27 80503c38 1ce0: 85ad2800 85ad2800 df9e1d14 df9e1cf8 813b8480 813b8074 85ad2800 841aaa80 1d00: df9e1da4 00004f27 df9e1d54 df9e1d18 813b8674 813b8400 82ae3d60 841a3e00 1d20: 82821598 00000000 00000000 829d00c4 841aaa80 841aaac4 df9e1d90 841aaa80 1d40: 00000000 82b16f00 df9e1d8c df9e1d58 813a7578 813b85c4 200000c0 00000000 1d60: df9e1d7c 200000c0 841aaa80 b5403587 200000c0 83acb000 40946400 00000003 1d80: df9e1e4c df9e1d90 813a30f8 813a747c 35353238 00000000 00000000 00000000 1da0: 00000000 00004f27 00000005 00000002 00000401 00000000 00000cc7 00000fff 1dc0: 5c952399 00000005 000003ff 00000802 00001600 00000001 00000001 00000009 1de0: 0000e1cb 00000006 00000004 00000003 00000395 80000089 fffffffd 0000002f 1e00: ffbffff5 ffffeadb 00000003 0000003c 00000008 00000004 08000000 dffffffa 1e20: 00000000 74a482a6 00000000 84e0ec00 841aaa80 200000c0 200000c0 83acb000 1e40: df9e1f14 df9e1e50 813a40c4 813a3004 00000000 00000000 00000000 74a482a6 1e60: 00000000 00000000 8247054c 0000005f 840dbe58 841aaab0 841e224c 83acb000 1e80: df9e1ee4 df9e1e90 8079782c 8078db90 00000064 00000001 00000000 df9e1eac 1ea0: 8597a610 834e6aa0 00006400 0000000b df9e1ea0 00000000 00000000 74a482a6 1ec0: 84e0ec00 40946400 200000c0 200000c0 84e0ec00 00000003 df9e1ef4 df9e1ee8 1ee0: 8079794c 74a482a6 df9e1f14 40946400 00000000 84e0ec01 200000c0 84e0ec00 1f00: 00000003 83acb000 df9e1fa4 df9e1f18 8056ce00 813a3af4 ecac8b10 83acb000 1f20: df9e1f3c df9e1f30 81a39338 81a39208 df9e1f54 df9e1f40 8025e490 8028ef8c 1f40: df9e1fb0 40000000 df9e1f84 df9e1f58 802229ec 8025e44c 00000000 8281cddc 1f60: df9e1fb0 0014c820 ecac8b10 80222940 00000000 74a482a6 df9e1fac 00000000 1f80: 00000000 002f6308 00000036 8020029c 83acb000 00000036 00000000 df9e1fa8 1fa0: 80200060 8056ccdc 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f220bc 1fe0: 76f21ec0 76f21eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813b8388>] (subdev_8255_io) from [<813b80c0>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:841aaa80 r4:813b8388 [<813b8068>] (subdev_8255_do_config) from [<813b8480>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813b8068>] (subdev_8255_do_config) from [<813b8480>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85ad2800 [<813b83f4>] (subdev_8255_io_init) from [<813b8674>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813b83f4>] (subdev_8255_io_init) from [<813b8674>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:df9e1da4 r5:841aaa80 r4:85ad2800 [<813b85b8>] (dev_8255_attach) from [<813a7578>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r10:82b16f00 r9:00000000 r8:841aaa80 r7:df9e1d90 r6:841aaac4 r5:841aaa80 r4:829d00c4 [<813a7470>] (comedi_device_attach) from [<813a30f8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83acb000 r7:200000c0 r6:b5403587 r5:841aaa80 r4:200000c0 [<813a2ff8>] (do_devconfig_ioctl) from [<813a40c4>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:83acb000 r7:200000c0 r6:200000c0 r5:841aaa80 r4:84e0ec00 [<813a3ae8>] (comedi_unlocked_ioctl) from [<8056ce00>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3ae8>] (comedi_unlocked_ioctl) from [<8056ce00>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3ae8>] (comedi_unlocked_ioctl) from [<8056ce00>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3ae8>] (comedi_unlocked_ioctl) from [<8056ce00>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:83acb000 r9:00000003 r8:84e0ec00 r7:200000c0 r6:84e0ec01 r5:00000000 r4:40946400 [<8056ccd0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9e1fa8 to 0xdf9e1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f220bc 1fe0: 76f21ec0 76f21eb0 0001948c 001322c0 r10:00000036 r9:83acb000 r8:8020029c r7:00000036 r6:002f6308 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