8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2d when write [fee04f2d] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 10011 Comm: syz.3.1489 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 : [<8143e3e0>] lr : [<8143e3cc>] psr: 60000013 sp : eaa95cb8 ip : eaa95cb8 fp : eaa95cd4 r10: 00000000 r9 : 00000084 r8 : eaa95da4 r7 : 00004f2a r6 : 0000009b r5 : 841d0cc0 r4 : 00004f2d r3 : 0000009b r2 : fee04f2d r1 : 00000001 r0 : 841d0cc0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84da73c0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 841d0cc0 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 841d0cc0 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: 2-page vmalloc region starting at 0xeaa94000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xeaa94000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xeaa94000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.3.1489 (pid: 10011, stack limit = 0xeaa94000) Stack: (0xeaa95cb8 to 0xeaa96000) 5ca0: 8143e380 00004f2a 5cc0: 841d0cc0 00004f2a eaa95cf4 eaa95cd8 8143e0bc 8143e38c 00004f2a 80522740 5ce0: 90bbf800 90bbf800 eaa95d14 eaa95cf8 8143e474 8143e070 841d0cc0 00000000 5d00: 90bbf800 00004f2a eaa95d54 eaa95d18 8143e624 8143e3f8 829d6e04 841d0cc0 5d20: 00000000 00000000 841d0cc0 829d6e04 841d0cc0 00000000 eaa95d90 841d0cc0 5d40: 00000000 82b2efdc eaa95d8c eaa95d58 8142cf68 8143e5bc 40946400 00000000 5d60: eaa95d7c 200000c0 841d0cc0 b5403587 40946400 00000003 00000003 83e06c00 5d80: eaa95e4c eaa95d90 81428774 8142ce68 35353238 00000000 00000000 00000000 5da0: 00000000 00004f2a ffffffff 00010007 00000004 00001d02 00000001 00000085 5dc0: 00000005 00000081 00000003 00000002 fffffffe 00000001 80000001 00000000 5de0: 00000101 00000008 00400009 00000004 00000005 00000099 0000caa7 00000080 5e00: 00000000 00000005 02000e67 00000002 00000008 00000008 00000000 fffbfff8 5e20: 00000000 f41cacf8 00000000 86257a80 841d0cc0 200000c0 40946400 00000003 5e40: eaa95f14 eaa95e50 81429a98 814286ac 00000000 f41cacf8 00000000 00000000 5e60: 824b857c eaa95ea4 0000005f 8476a838 00000064 841d0cf0 eaa95ee4 eaa95e88 5e80: 807cda4c 807c3e24 00000064 00000001 00000000 eaa95ea4 86289010 83430c38 5ea0: 00006400 0000000b eaa95e98 00000000 00000000 f41cacf8 00000000 86257a80 5ec0: 40946400 200000c0 200000c0 86257a80 00000003 83e06c00 eaa95ef4 eaa95ee8 5ee0: 807cdb7c f41cacf8 eaa95f14 00000000 86257a81 40946400 200000c0 86257a80 5f00: 00000003 83e06c00 eaa95fa4 eaa95f18 8058f90c 81429750 ecac8b10 83e06c00 5f20: eaa95f3c eaa95f30 81ae17f4 81ae16c0 eaa95f54 eaa95f40 8025a868 8028c368 5f40: eaa95fb0 40000000 eaa95f84 eaa95f58 80220bf8 8025a824 00000000 8281d2bc 5f60: eaa95fb0 0013e480 ecac8b10 80220b4c 00000000 f41cacf8 eaa95fac 00000000 5f80: 00000000 00346310 00000036 8020029c 83e06c00 00000036 00000000 eaa95fa8 5fa0: 80200060 8058f6d4 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f950dc 5fe0: 76f94e88 76f94e78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<8143e380>] (subdev_8255_io) from [<8143e0bc>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f2a r6:841d0cc0 r5:00004f2a r4:8143e380 [<8143e064>] (subdev_8255_do_config) from [<8143e474>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8143e064>] (subdev_8255_do_config) from [<8143e474>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:90bbf800 [<8143e3ec>] (subdev_8255_io_init) from [<8143e624>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8143e3ec>] (subdev_8255_io_init) from [<8143e624>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f2a r6:90bbf800 r5:00000000 r4:841d0cc0 [<8143e5b0>] (dev_8255_attach) from [<8142cf68>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2efdc r9:00000000 r8:841d0cc0 r7:eaa95d90 r6:00000000 r5:841d0cc0 r4:829d6e04 [<8142ce5c>] (comedi_device_attach) from [<81428774>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:83e06c00 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:841d0cc0 r4:200000c0 [<814286a0>] (do_devconfig_ioctl) from [<81429a98>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:841d0cc0 r4:86257a80 [<81429744>] (comedi_unlocked_ioctl) from [<8058f90c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81429744>] (comedi_unlocked_ioctl) from [<8058f90c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81429744>] (comedi_unlocked_ioctl) from [<8058f90c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81429744>] (comedi_unlocked_ioctl) from [<8058f90c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83e06c00 r9:00000003 r8:86257a80 r7:200000c0 r6:40946400 r5:86257a81 r4:00000000 [<8058f6c8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xeaa95fa8 to 0xeaa95ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f950dc 5fe0: 76f94e88 76f94e78 00018ba0 001302e0 r10:00000036 r9:83e06c00 r8:8020029c r7:00000036 r6:00346310 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