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: 0 UID: 0 PID: 8675 Comm: syz.6.957 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : [<814579ec>] lr : [<814579d8>] psr: 60000013 sp : dfc25cb8 ip : dfc25cb8 fp : dfc25cd4 r10: 00000000 r9 : 00000084 r8 : dfc25da4 r7 : 00004f27 r6 : 0000009b r5 : 8465d6c0 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8465d6c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86304ec0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8465d6c0 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:1048 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 8465d6c0 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 0xdfc24000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xdfc24000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Register r12 information: 2-page vmalloc region starting at 0xdfc24000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Process syz.6.957 (pid: 8675, stack limit = 0xdfc24000) Stack: (0xdfc25cb8 to 0xdfc26000) 5ca0: 8145798c 00004f27 5cc0: 8465d6c0 00004f27 dfc25cf4 dfc25cd8 814576c8 81457998 00004f27 8052d13c 5ce0: 8512f000 8512f000 dfc25d14 dfc25cf8 81457a80 8145767c 8465d6c0 00000000 5d00: 8512f000 00004f27 dfc25d54 dfc25d18 81457c30 81457a04 82d08978 8335a700 5d20: 82a20540 00000000 00000000 82bd2d1c 8465d6c0 00000000 dfc25d90 8465d6c0 5d40: 00000000 82d2bd3c dfc25d8c dfc25d58 81446578 81457bc8 40946400 00000000 5d60: dfc25d7c 200000c0 8465d6c0 b5403587 40946400 00000003 00000003 83f79880 5d80: dfc25e4c dfc25d90 81441d90 8144647c 35353238 00000000 00000000 00000000 5da0: 00000000 00004f27 00000005 00000002 00000401 00000001 00000cc7 00000fff 5dc0: 0000002f 00000005 000003ff 00000802 00001600 00010001 00000001 00000009 5de0: 0000e1cb 0000012d 00000004 00000003 00000000 00000000 fffffffd 00000000 5e00: fffffff5 ffffeadb 00000003 00000039 0000000a 00000004 08000000 dffffffa 5e20: 00000000 67ecf33e 00000000 86c5e100 8465d6c0 200000c0 40946400 00000003 5e40: dfc25f14 dfc25e50 814430b4 81441cc8 00000000 67ecf33e 00000000 00000000 5e60: 8252d804 dfc25ea4 0000005f 8444f850 00000064 8465d6f0 dfc25ee4 dfc25e88 5e80: 807dea64 807d4d94 00000064 00000001 00000000 dfc25ea4 85e21310 8342a550 5ea0: 00006400 0000000b dfc25e98 00000000 00000000 67ecf33e 00000000 86c5e100 5ec0: 40946400 200000c0 200000c0 86c5e100 00000003 83f79880 dfc25ef4 dfc25ee8 5ee0: 807deb98 67ecf33e dfc25f14 00000000 86c5e101 40946400 200000c0 86c5e100 5f00: 00000003 83f79880 dfc25fa4 dfc25f18 8059c24c 81442d6c ecac8b10 83f79880 5f20: dfc25f3c dfc25f30 81b01ff4 81b01ec0 dfc25f54 dfc25f40 8025a4dc 8028c2bc 5f40: dfc25fb0 40000000 dfc25f84 dfc25f58 80220be0 8025a498 00000000 82a1c27c 5f60: dfc25fb0 0013e4a0 ecac8b10 80220b34 00000000 67ecf33e dfc25fac 00000000 5f80: 00000000 00346310 00000036 8020029c 83f79880 00000036 00000000 dfc25fa8 5fa0: 80200060 8059c014 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f2b0dc 5fe0: 76f2ae88 76f2ae78 00018bc4 00130300 60000010 00000003 00000000 00000000 Call trace: [<8145798c>] (subdev_8255_io) from [<814576c8>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:8465d6c0 r5:00004f27 r4:8145798c [<81457670>] (subdev_8255_do_config) from [<81457a80>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81457670>] (subdev_8255_do_config) from [<81457a80>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8512f000 [<814579f8>] (subdev_8255_io_init) from [<81457c30>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<814579f8>] (subdev_8255_io_init) from [<81457c30>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:8512f000 r5:00000000 r4:8465d6c0 [<81457bbc>] (dev_8255_attach) from [<81446578>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1077) r10:82d2bd3c r9:00000000 r8:8465d6c0 r7:dfc25d90 r6:00000000 r5:8465d6c0 r4:82bd2d1c [<81446470>] (comedi_device_attach) from [<81441d90>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:83f79880 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8465d6c0 r4:200000c0 [<81441cbc>] (do_devconfig_ioctl) from [<814430b4>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:200000c0 r5:8465d6c0 r4:86c5e100 [<81442d60>] (comedi_unlocked_ioctl) from [<8059c24c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81442d60>] (comedi_unlocked_ioctl) from [<8059c24c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81442d60>] (comedi_unlocked_ioctl) from [<8059c24c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81442d60>] (comedi_unlocked_ioctl) from [<8059c24c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83f79880 r9:00000003 r8:86c5e100 r7:200000c0 r6:40946400 r5:86c5e101 r4:00000000 [<8059c008>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc25fa8 to 0xdfc25ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f2b0dc 5fe0: 76f2ae88 76f2ae78 00018bc4 00130300 r10:00000036 r9:83f79880 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