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: 11074 Comm: syz.1.1873 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 : [<8143e5f0>] lr : [<8143e5dc>] psr: 60000013 sp : ead31cb8 ip : ead31cb8 fp : ead31cd4 r10: 00000000 r9 : 00000084 r8 : ead31da4 r7 : 00004f2a r6 : 0000009b r5 : 8301a900 r4 : 00004f2d r3 : 0000009b r2 : fee04f2d r1 : 00000001 r0 : 8301a900 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86676400 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8301a900 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 8301a900 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 0xead30000 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 0xead30000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xead30000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.1.1873 (pid: 11074, stack limit = 0xead30000) Stack: (0xead31cb8 to 0xead32000) 1ca0: 8143e590 00004f2a 1cc0: 8301a900 00004f2a ead31cf4 ead31cd8 8143e2cc 8143e59c 00004f2a 805228bc 1ce0: 85ce7800 85ce7800 ead31d14 ead31cf8 8143e684 8143e280 8301a900 00000000 1d00: 85ce7800 00004f2a ead31d54 ead31d18 8143e834 8143e608 82b0b73c 83f48b80 1d20: 828217c0 00000000 00000000 829d6e04 8301a900 00000000 ead31d90 8301a900 1d40: 00000000 82b2efdc ead31d8c ead31d58 8142d16c 8143e7cc 40946400 00000000 1d60: ead31d7c 200000c0 8301a900 b5403587 40946400 00000003 00000003 85916c00 1d80: ead31e4c ead31d90 81428980 8142d06c 35353238 00000000 00000000 00000000 1da0: 00000000 00004f2a 00000005 00200002 00000401 00000001 00000cc7 00000fff 1dc0: 5c95239c 00000001 000003ff 00000003 00001600 00000001 00000001 00000000 1de0: 0000e1cb 00000c4b 00000004 0000000d 00000001 8000008b fffffffe 0000000b 1e00: fffffff5 ffffeadb 00000003 000003ff 00001001 00000004 00000008 dffffffa 1e20: 00000000 3bfd5e8d 00000000 8666f0c0 8301a900 200000c0 40946400 00000003 1e40: ead31f14 ead31e50 81429ca4 814288b8 00000000 3bfd5e8d 00000000 00000000 1e60: 824b857c ead31ea4 0000005f 83fabde0 00000064 8301a930 ead31ee4 ead31e88 1e80: 807cdb3c 807c3f14 00000064 00000001 00000000 ead31ea4 8689b6d0 83439dd0 1ea0: 00006400 0000000b ead31e98 00000000 00000000 3bfd5e8d 00000000 8666f0c0 1ec0: 40946400 200000c0 200000c0 8666f0c0 00000003 85916c00 ead31ef4 ead31ee8 1ee0: 807cdc6c 3bfd5e8d ead31f14 00000000 8666f0c1 40946400 200000c0 8666f0c0 1f00: 00000003 85916c00 ead31fa4 ead31f18 8058fa5c 8142995c ecac8b10 85916c00 1f20: ead31f3c ead31f30 81ae18b4 81ae1780 ead31f54 ead31f40 8025a85c 8028c340 1f40: ead31fb0 40000000 ead31f84 ead31f58 80220bf8 8025a818 00000000 8281d2bc 1f60: ead31fb0 0013e290 ecac8b10 80220b4c 00000000 3bfd5e8d ead31fac 00000000 1f80: 00000000 00346310 00000036 8020029c 85916c00 00000036 00000000 ead31fa8 1fa0: 80200060 8058f824 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fa20dc 1fe0: 76fa1e88 76fa1e78 00018ba0 001300f0 60000010 00000003 00000000 00000000 Call trace: [<8143e590>] (subdev_8255_io) from [<8143e2cc>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f2a r6:8301a900 r5:00004f2a r4:8143e590 [<8143e274>] (subdev_8255_do_config) from [<8143e684>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8143e274>] (subdev_8255_do_config) from [<8143e684>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85ce7800 [<8143e5fc>] (subdev_8255_io_init) from [<8143e834>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8143e5fc>] (subdev_8255_io_init) from [<8143e834>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f2a r6:85ce7800 r5:00000000 r4:8301a900 [<8143e7c0>] (dev_8255_attach) from [<8142d16c>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2efdc r9:00000000 r8:8301a900 r7:ead31d90 r6:00000000 r5:8301a900 r4:829d6e04 [<8142d060>] (comedi_device_attach) from [<81428980>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:85916c00 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301a900 r4:200000c0 [<814288ac>] (do_devconfig_ioctl) from [<81429ca4>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:8301a900 r4:8666f0c0 [<81429950>] (comedi_unlocked_ioctl) from [<8058fa5c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81429950>] (comedi_unlocked_ioctl) from [<8058fa5c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81429950>] (comedi_unlocked_ioctl) from [<8058fa5c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81429950>] (comedi_unlocked_ioctl) from [<8058fa5c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:85916c00 r9:00000003 r8:8666f0c0 r7:200000c0 r6:40946400 r5:8666f0c1 r4:00000000 [<8058f818>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xead31fa8 to 0xead31ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fa20dc 1fe0: 76fa1e88 76fa1e78 00018ba0 001300f0 r10:00000036 r9:85916c00 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