8<--- cut here --- Unable to handle kernel paging request at virtual address fee01653 when write [fee01653] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 3770 Comm: syz.0.24 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 : [<8145a508>] lr : [<8145a4f4>] psr: 60000013 sp : ea4f9cb8 ip : ea4f9cb8 fp : ea4f9cd4 r10: 00001650 r9 : 00000004 r8 : ea4f9da4 r7 : 00000000 r6 : 0000009b r5 : 8301b000 r4 : 00001653 r3 : 0000009b r2 : fee01653 r1 : 00000001 r0 : 8301b000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86091bc0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8301b000 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 8301b000 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 0xea4f8000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xea4f8000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Register r12 information: 2-page vmalloc region starting at 0xea4f8000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Process syz.0.24 (pid: 3770, stack limit = 0xea4f8000) Stack: (0xea4f9cb8 to 0xea4fa000) 9ca0: 8145a4a8 00001650 9cc0: 8301b000 00000000 ea4f9cf4 ea4f9cd8 8145a1e4 8145a4b4 00001650 8052d19c 9ce0: 841b8a00 841b8a00 ea4f9d14 ea4f9cf8 8145a59c 8145a198 8301b000 00000000 9d00: 841b8a00 00000000 ea4f9d54 ea4f9d18 8145a74c 8145a520 ffffffff 00000004 9d20: 82a20600 00000000 00000000 82bd2e5c 8301b000 00000000 ea4f9d90 8301b000 9d40: 00000000 82d2bd44 ea4f9d8c ea4f9d58 814490d4 8145a6e4 40946400 00000000 9d60: ea4f9d7c 200000c0 8301b000 b5403587 40946400 00000002 00000003 84f74980 9d80: ea4f9e4c ea4f9d90 814448e0 81448fd8 35353238 00000000 00000000 00000000 9da0: 00000000 00001650 00000004 00000001 00000000 fffffffc 00000006 00000009 9dc0: 00000001 0000000a 00000104 00000002 00000001 00000008 00000006 00000006 9de0: 00000007 00000001 0001a449 80000000 40002003 00000001 00000002 00004f23 9e00: 00000006 0000800b 00000ca7 00000005 0000000f 00000006 0000fffc 00000001 9e20: 00000000 8249c92b 00000000 857ac200 8301b000 200000c0 40946400 00000002 9e40: ea4f9f14 ea4f9e50 81445c04 81444818 00000000 8249c92b 00000000 00000000 9e60: 8252e804 ea4f9ea4 0000005f 84220408 00000064 8301b030 ea4f9ee4 ea4f9e88 9e80: 807ded8c 807d50bc 00000064 00000001 00000000 ea4f9ea4 83364010 8342eaa0 9ea0: 00006400 0000000b ea4f9e98 00000000 00000000 8249c92b 00000000 857ac200 9ec0: 40946400 200000c0 200000c0 857ac200 00000003 84f74980 ea4f9ef4 ea4f9ee8 9ee0: 807deec0 8249c92b ea4f9f14 00000000 857ac201 40946400 200000c0 857ac200 9f00: 00000003 84f74980 ea4f9fa4 ea4f9f18 8059c2ac 814458bc ecac8b10 84f74980 9f20: ea4f9f3c ea4f9f30 81b058f4 81b057c0 ea4f9f54 ea4f9f40 8025a4dc 8028c2bc 9f40: ea4f9fb0 40000000 ea4f9f84 ea4f9f58 80220be0 8025a498 00000000 82a1c33c 9f60: ea4f9fb0 0013e940 ecac8b10 80220b34 00000000 8249c92b ea4f9fac 00000000 9f80: 00000000 00346310 00000036 8020029c 84f74980 00000036 00000000 ea4f9fa8 9fa0: 80200060 8059c074 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff00dc 9fe0: 76fefe88 76fefe78 00018e58 001307a0 60000010 00000003 00000000 00000000 Call trace: [<8145a4a8>] (subdev_8255_io) from [<8145a1e4>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8301b000 r5:00001650 r4:8145a4a8 [<8145a18c>] (subdev_8255_do_config) from [<8145a59c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8145a18c>] (subdev_8255_do_config) from [<8145a59c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:841b8a00 [<8145a514>] (subdev_8255_io_init) from [<8145a74c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8145a514>] (subdev_8255_io_init) from [<8145a74c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:841b8a00 r5:00000000 r4:8301b000 [<8145a6d8>] (dev_8255_attach) from [<814490d4>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2bd44 r9:00000000 r8:8301b000 r7:ea4f9d90 r6:00000000 r5:8301b000 r4:82bd2e5c [<81448fcc>] (comedi_device_attach) from [<814448e0>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:84f74980 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:8301b000 r4:200000c0 [<8144480c>] (do_devconfig_ioctl) from [<81445c04>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200000c0 r5:8301b000 r4:857ac200 [<814458b0>] (comedi_unlocked_ioctl) from [<8059c2ac>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814458b0>] (comedi_unlocked_ioctl) from [<8059c2ac>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814458b0>] (comedi_unlocked_ioctl) from [<8059c2ac>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814458b0>] (comedi_unlocked_ioctl) from [<8059c2ac>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84f74980 r9:00000003 r8:857ac200 r7:200000c0 r6:40946400 r5:857ac201 r4:00000000 [<8059c068>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea4f9fa8 to 0xea4f9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff00dc 9fe0: 76fefe88 76fefe78 00018e58 001307a0 r10:00000036 r9:84f74980 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