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: 5604 Comm: syz.0.537 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:99 [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 : [<814a21ec>] lr : [<814a21d8>] psr: 60000013 sp : ea4ddcb8 ip : ea4ddcb8 fp : ea4ddcd4 r10: 00000100 r9 : 00000004 r8 : ea4ddda4 r7 : 00000000 r6 : 0000009b r5 : 84876cc0 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 84876cc0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8627aa80 DAC: 00000000 Register r0 information: slab kmalloc-192 start 84876cc0 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 84876cc0 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 0xea4dc000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xea4dc000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xea4dc000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.0.537 (pid: 5604, stack limit = 0xea4dc000) Stack: (0xea4ddcb8 to 0xea4de000) dca0: 814a218c 00000100 dcc0: 84876cc0 00000000 ea4ddcf4 ea4ddcd8 814a1ec8 814a2198 00000100 805463f0 dce0: 8608ec00 8608ec00 ea4ddd14 ea4ddcf8 814a2280 814a1e7c 84876cc0 00000000 dd00: 8608ec00 00000000 ea4ddd54 ea4ddd18 814a2430 814a2204 ffffffff 00000004 dd20: 82a22dc0 00000000 00000000 82bd965c 84876cc0 00000000 ea4ddd90 84876cc0 dd40: 00000000 82d30dfc ea4ddd8c ea4ddd58 81490db4 814a23c8 40946400 00000000 dd60: ea4ddd7c 200000c0 84876cc0 b5403587 40946400 00000003 00000003 84830c40 dd80: ea4dde4c ea4ddd90 8148c5b8 81490cb8 35353238 00000000 00000000 00000000 dda0: 00000000 00000100 00000007 00000002 00001001 0000000f 00000000 00000079 ddc0: 000001ff 00080008 00000006 ffffffff 00000001 00800008 00000003 00000100 dde0: 00000101 fffffffb 00000009 f0000001 00000009 00000089 0000ca9f 80000000 de00: 20001ed8 ffffffff 0000f39e 00000003 00000008 0000a6b8 00000000 fffffff8 de20: 00000000 fe703868 00000000 85e71100 84876cc0 200000c0 40946400 00000003 de40: ea4ddf14 ea4dde50 8148d8e0 8148c4f8 00000000 fe703868 00000000 00000000 de60: 8254a844 ea4ddea4 0000005f 840a1850 00000064 84876cf0 ea4ddee4 ea4dde88 de80: 808065fc 807fccb4 00000064 00000001 00000000 ea4ddea4 84190c10 8342cdd0 dea0: 00006400 0000000b ea4dde98 00000000 00000000 fe703868 00000000 85e71100 dec0: 40946400 200000c0 200000c0 85e71100 00000003 84830c40 ea4ddef4 ea4ddee8 dee0: 80806730 fe703868 ea4ddf14 00000000 85e71101 40946400 200000c0 85e71100 df00: 00000003 84830c40 ea4ddfa4 ea4ddf18 805bb114 8148d598 ecac8b10 84830c40 df20: ea4ddf3c ea4ddf30 81b5c4e0 81b5c3ac ea4ddf54 ea4ddf40 8025a7a8 8028e490 df40: ea4ddfb0 40000000 ea4ddf84 ea4ddf58 80220bdc 8025a764 00000000 82a1eb0c df60: ea4ddfb0 0013eb80 ecac8b10 80220b30 00000000 fe703868 ea4ddfac 00000000 df80: 00000000 00356310 00000036 8020029c 84830c40 00000036 00000000 ea4ddfa8 dfa0: 80200060 805baedc 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f1e0dc dfe0: 76f1de88 76f1de78 00018f80 001309e0 60000010 00000003 00000000 00000000 Call trace: [<814a218c>] (subdev_8255_io) from [<814a1ec8>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:84876cc0 r5:00000100 r4:814a218c [<814a1e70>] (subdev_8255_do_config) from [<814a2280>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814a1e70>] (subdev_8255_do_config) from [<814a2280>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8608ec00 [<814a21f8>] (subdev_8255_io_init) from [<814a2430>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814a21f8>] (subdev_8255_io_init) from [<814a2430>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:8608ec00 r5:00000000 r4:84876cc0 [<814a23bc>] (dev_8255_attach) from [<81490db4>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:84876cc0 r7:ea4ddd90 r6:00000000 r5:84876cc0 r4:82bd965c [<81490cac>] (comedi_device_attach) from [<8148c5b8>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:84830c40 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:84876cc0 r4:200000c0 [<8148c4ec>] (do_devconfig_ioctl) from [<8148d8e0>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:200000c0 r5:84876cc0 r4:85e71100 [<8148d58c>] (comedi_unlocked_ioctl) from [<805bb114>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148d58c>] (comedi_unlocked_ioctl) from [<805bb114>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148d58c>] (comedi_unlocked_ioctl) from [<805bb114>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148d58c>] (comedi_unlocked_ioctl) from [<805bb114>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84830c40 r9:00000003 r8:85e71100 r7:200000c0 r6:40946400 r5:85e71101 r4:00000000 [<805baed0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea4ddfa8 to 0xea4ddff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f1e0dc dfe0: 76f1de88 76f1de78 00018f80 001309e0 r10:00000036 r9:84830c40 r8:8020029c r7:00000036 r6:00356310 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