8<--- cut here --- Unable to handle kernel paging request at virtual address fee00809 when write [fee00809] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 10400 Comm: syz.9.712 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 : [<81459504>] lr : [<814594f0>] psr: 60000013 sp : ea515cb8 ip : ea515cb8 fp : ea515cd4 r10: 00000000 r9 : 00000084 r8 : ea515da4 r7 : 00000806 r6 : 0000009b r5 : 8301bcc0 r4 : 00000809 r3 : 0000009b r2 : fee00809 r1 : 00000001 r0 : 8301bcc0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 860ff840 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8301bcc0 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 8301bcc0 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 0xea514000 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 0xea514000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Register r12 information: 2-page vmalloc region starting at 0xea514000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Process syz.9.712 (pid: 10400, stack limit = 0xea514000) Stack: (0xea515cb8 to 0xea516000) 5ca0: 814594a4 00000806 5cc0: 8301bcc0 00000806 ea515cf4 ea515cd8 814591e0 814594b0 00000806 8052d15c 5ce0: 86982000 86982000 ea515d14 ea515cf8 81459598 81459194 8301bcc0 00000000 5d00: 86982000 00000806 ea515d54 ea515d18 81459748 8145951c 82d130b8 8331a200 5d20: 82a20540 00000000 00000000 82bd2d5c 8301bcc0 00000000 ea515d90 8301bcc0 5d40: 00000000 82d2bd3c ea515d8c ea515d58 81448090 814596e0 40946400 00000000 5d60: ea515d7c 200000c0 8301bcc0 b5403587 40946400 00000003 00000003 851bee40 5d80: ea515e4c ea515d90 814438a8 81447f94 35353238 00000000 00000000 00000000 5da0: 00000000 00000806 00010000 00000002 10000421 00000004 00010cc7 00002ae3 5dc0: 00000004 00000005 000003ff 00000008 00000300 00000004 00000001 00000009 5de0: 00000800 00040400 00000008 00000006 000001fe 80000089 0040000d 01400000 5e00: 20001e54 ffffeadb 00000003 0000003d 00000009 00000004 07fffffe 00000000 5e20: 00000000 16eaa53c 00000000 85118280 8301bcc0 200000c0 40946400 00000003 5e40: ea515f14 ea515e50 81444bcc 814437e0 00000000 16eaa53c 00000000 00000000 5e60: 8252e804 ea515ea4 0000005f 84634990 00000064 8301bcf0 ea515ee4 ea515e88 5e80: 807de9dc 807d4d0c 00000064 00000001 00000000 ea515ea4 86567850 83427d48 5ea0: 00006400 0000000b ea515e98 00000000 00000000 16eaa53c 00000000 85118280 5ec0: 40946400 200000c0 200000c0 85118280 00000003 851bee40 ea515ef4 ea515ee8 5ee0: 807deb10 16eaa53c ea515f14 00000000 85118281 40946400 200000c0 85118280 5f00: 00000003 851bee40 ea515fa4 ea515f18 8059c26c 81444884 ecac8b10 851bee40 5f20: ea515f3c ea515f30 81b03af4 81b039c0 ea515f54 ea515f40 8025a4dc 8028c2bc 5f40: ea515fb0 40000000 ea515f84 ea515f58 80220be0 8025a498 00000000 82a1c27c 5f60: ea515fb0 0013e4a0 ecac8b10 80220b34 00000000 16eaa53c ea515fac 00000000 5f80: 00000000 00346310 00000036 8020029c 851bee40 00000036 00000000 ea515fa8 5fa0: 80200060 8059c034 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f040dc 5fe0: 76f03e88 76f03e78 00018bc4 00130300 60000010 00000003 00000000 00000000 Call trace: [<814594a4>] (subdev_8255_io) from [<814591e0>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000806 r6:8301bcc0 r5:00000806 r4:814594a4 [<81459188>] (subdev_8255_do_config) from [<81459598>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81459188>] (subdev_8255_do_config) from [<81459598>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86982000 [<81459510>] (subdev_8255_io_init) from [<81459748>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<81459510>] (subdev_8255_io_init) from [<81459748>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00000806 r6:86982000 r5:00000000 r4:8301bcc0 [<814596d4>] (dev_8255_attach) from [<81448090>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1077) r10:82d2bd3c r9:00000000 r8:8301bcc0 r7:ea515d90 r6:00000000 r5:8301bcc0 r4:82bd2d5c [<81447f88>] (comedi_device_attach) from [<814438a8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:851bee40 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301bcc0 r4:200000c0 [<814437d4>] (do_devconfig_ioctl) from [<81444bcc>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:200000c0 r5:8301bcc0 r4:85118280 [<81444878>] (comedi_unlocked_ioctl) from [<8059c26c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81444878>] (comedi_unlocked_ioctl) from [<8059c26c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81444878>] (comedi_unlocked_ioctl) from [<8059c26c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81444878>] (comedi_unlocked_ioctl) from [<8059c26c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:851bee40 r9:00000003 r8:85118280 r7:200000c0 r6:40946400 r5:85118281 r4:00000000 [<8059c028>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea515fa8 to 0xea515ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f040dc 5fe0: 76f03e88 76f03e78 00018bc4 00130300 r10:00000036 r9:851bee40 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