8<--- cut here --- Unable to handle kernel paging request at virtual address fee00103 when write [fee00103] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 8872 Comm: syz.4.744 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 : [<8145aea8>] lr : [<8145ae94>] psr: 60000013 sp : dfdadcb8 ip : dfdadcb8 fp : dfdadcd4 r10: 00000100 r9 : 00000004 r8 : dfdadda4 r7 : 00000000 r6 : 0000009b r5 : 846d16c0 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 846d16c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85efeb00 DAC: 00000000 Register r0 information: slab kmalloc-192 start 846d16c0 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 846d16c0 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: 2-page vmalloc region starting at 0xdfdac000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfdac000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xdfdac000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Process syz.4.744 (pid: 8872, stack limit = 0xdfdac000) Stack: (0xdfdadcb8 to 0xdfdae000) dca0: 8145ae48 00000100 dcc0: 846d16c0 00000000 dfdadcf4 dfdadcd8 8145ab84 8145ae54 00000100 8052d014 dce0: 8382b000 8382b000 dfdadd14 dfdadcf8 8145af3c 8145ab38 846d16c0 00000000 dd00: 8382b000 00000000 dfdadd54 dfdadd18 8145b0ec 8145aec0 ffffffff 00000004 dd20: 82a205c0 00000000 00000000 82bd2f5c 846d16c0 00000000 dfdadd90 846d16c0 dd40: 00000000 82d2bdc4 dfdadd8c dfdadd58 81449a74 8145b084 40946400 00000000 dd60: dfdadd7c 20000180 846d16c0 b5403587 40946400 00000003 00000003 833f9880 dd80: dfdade4c dfdadd90 81445280 81449978 35353238 00000000 00000000 00000000 dda0: 00000000 00000100 000003ff 00000001 00000001 0000858d 00000100 00000008 ddc0: 20000000 00000007 0000000a 00000000 00000007 00000005 00000401 00000009 dde0: 00000000 00000001 00000008 00000fe6 00000401 00000007 00000004 00000007 de00: 04000009 00000048 00000007 00000010 00000005 00000081 00000007 00000008 de20: 00000000 24d76127 00000000 85917600 846d16c0 20000180 40946400 00000003 de40: dfdadf14 dfdade50 814465a4 814451b8 00000000 24d76127 00000000 00000000 de60: 8252f804 dfdadea4 0000005f 8465bc00 00000064 846d16f0 dfdadee4 dfdade88 de80: 807df0b0 807d53c4 00000064 00000001 00000000 dfdadea4 830ebc10 834e0440 dea0: 00006400 0000000b dfdade98 00000000 00000000 24d76127 00000000 85917600 dec0: 40946400 20000180 20000180 85917600 00000003 833f9880 dfdadef4 dfdadee8 dee0: 807df1e4 24d76127 dfdadf14 00000000 85917601 40946400 20000180 85917600 df00: 00000003 833f9880 dfdadfa4 dfdadf18 8059c1ac 8144625c ecac8b10 833f9880 df20: dfdadf3c dfdadf30 81b07554 81b07420 dfdadf54 dfdadf40 8025a49c 8028c280 df40: dfdadfb0 40000000 dfdadf84 dfdadf58 80220be0 8025a458 00000000 82a1c2fc df60: dfdadfb0 0013e940 ecac8b10 80220b34 00000000 24d76127 dfdadfac 00000000 df80: 00000000 00346310 00000036 8020029c 833f9880 00000036 00000000 dfdadfa8 dfa0: 80200060 8059bf74 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76faa0dc dfe0: 76fa9e88 76fa9e78 00018e58 001307a0 60000010 00000003 00000000 00000000 Call trace: [<8145ae48>] (subdev_8255_io) from [<8145ab84>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:846d16c0 r5:00000100 r4:8145ae48 [<8145ab2c>] (subdev_8255_do_config) from [<8145af3c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8145ab2c>] (subdev_8255_do_config) from [<8145af3c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8382b000 [<8145aeb4>] (subdev_8255_io_init) from [<8145b0ec>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8145aeb4>] (subdev_8255_io_init) from [<8145b0ec>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:8382b000 r5:00000000 r4:846d16c0 [<8145b078>] (dev_8255_attach) from [<81449a74>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2bdc4 r9:00000000 r8:846d16c0 r7:dfdadd90 r6:00000000 r5:846d16c0 r4:82bd2f5c [<8144996c>] (comedi_device_attach) from [<81445280>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:833f9880 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:846d16c0 r4:20000180 [<814451ac>] (do_devconfig_ioctl) from [<814465a4>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:846d16c0 r4:85917600 [<81446250>] (comedi_unlocked_ioctl) from [<8059c1ac>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81446250>] (comedi_unlocked_ioctl) from [<8059c1ac>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81446250>] (comedi_unlocked_ioctl) from [<8059c1ac>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81446250>] (comedi_unlocked_ioctl) from [<8059c1ac>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:833f9880 r9:00000003 r8:85917600 r7:20000180 r6:40946400 r5:85917601 r4:00000000 [<8059bf68>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfdadfa8 to 0xdfdadff0) dfa0: 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76faa0dc dfe0: 76fa9e88 76fa9e78 00018e58 001307a0 r10:00000036 r9:833f9880 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