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: 11919 Comm: syz.7.1439 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 : [<814654f8>] lr : [<814654e4>] psr: 60000013 sp : dfd31cb8 ip : dfd31cb8 fp : dfd31cd4 r10: 00000100 r9 : 00000004 r8 : dfd31da4 r7 : 00000000 r6 : 0000009b r5 : 8301b000 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 8301b000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86d191c0 DAC: 00000000 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 0xdfd30000 allocated at kernel_clone+0xbc/0x43c 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 0xdfd30000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xdfd30000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.7.1439 (pid: 11919, stack limit = 0xdfd30000) Stack: (0xdfd31cb8 to 0xdfd32000) 1ca0: 81465498 00000100 1cc0: 8301b000 00000000 dfd31cf4 dfd31cd8 814651d4 814654a4 00000100 80532248 1ce0: 86ea9b40 86ea9b40 dfd31d14 dfd31cf8 8146558c 81465188 8301b000 00000000 1d00: 86ea9b40 00000000 dfd31d54 dfd31d18 8146573c 81465510 ffffffff 00000004 1d20: 82a20900 00000000 00000000 82bd325c 8301b000 00000000 dfd31d90 8301b000 1d40: 00000000 82d2cdc4 dfd31d8c dfd31d58 814540c4 814656d4 40946400 00000000 1d60: dfd31d7c 20000180 8301b000 b5403587 40946400 00000003 00000003 84097080 1d80: dfd31e4c dfd31d90 8144f8d0 81453fc8 35353238 00000000 00000000 00000000 1da0: 00000000 00000100 00000000 00000004 00000002 00000000 00000102 0000ffff 1dc0: 00007a0a 00000008 00000009 00000000 00000007 00000001 00000405 00010001 1de0: 00000001 00000003 00000008 00000fe9 00000401 00000005 00000004 00000007 1e00: 00000009 00000048 00000008 00000233 00006a77 00000002 00000004 00000008 1e20: 00000000 d070e398 00000000 8663b980 8301b000 20000180 40946400 00000003 1e40: dfd31f14 dfd31e50 81450bf4 8144f808 00000000 d070e398 00000000 00000000 1e60: 82530804 dfd31ea4 0000005f 84146d40 00000064 8301b030 dfd31ee4 dfd31e88 1e80: 807e94e8 807df7fc 00000064 00000001 00000000 dfd31ea4 8335d3d0 83435b28 1ea0: 00006400 0000000b dfd31e98 00000000 00000000 d070e398 dfd31fa4 8663b980 1ec0: 40946400 20000180 20000180 8663b980 00000003 84097080 dfd31ef4 dfd31ee8 1ee0: 807e961c d070e398 dfd31f14 00000000 8663b981 40946400 20000180 8663b980 1f00: 00000003 84097080 dfd31fa4 dfd31f18 805a1864 814508ac ecac8b10 84097080 1f20: dfd31f3c dfd31f30 81b15f14 81b15de0 dfd31f54 dfd31f40 8025a69c 8028e1bc 1f40: dfd31fb0 40000000 dfd31f84 dfd31f58 80220be0 8025a658 00000000 82a1c63c 1f60: dfd31fb0 0013e9b0 ecac8b10 80220b34 00000000 d070e398 dfd31fac 00000000 1f80: 00000000 00346310 00000036 8020029c 84097080 00000036 00000000 dfd31fa8 1fa0: 80200060 805a162c 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fc00dc 1fe0: 76fbfe88 76fbfe78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<81465498>] (subdev_8255_io) from [<814651d4>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8301b000 r5:00000100 r4:81465498 [<8146517c>] (subdev_8255_do_config) from [<8146558c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8146517c>] (subdev_8255_do_config) from [<8146558c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86ea9b40 [<81465504>] (subdev_8255_io_init) from [<8146573c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<81465504>] (subdev_8255_io_init) from [<8146573c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:86ea9b40 r5:00000000 r4:8301b000 [<814656c8>] (dev_8255_attach) from [<814540c4>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2cdc4 r9:00000000 r8:8301b000 r7:dfd31d90 r6:00000000 r5:8301b000 r4:82bd325c [<81453fbc>] (comedi_device_attach) from [<8144f8d0>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:84097080 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301b000 r4:20000180 [<8144f7fc>] (do_devconfig_ioctl) from [<81450bf4>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:8301b000 r4:8663b980 [<814508a0>] (comedi_unlocked_ioctl) from [<805a1864>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814508a0>] (comedi_unlocked_ioctl) from [<805a1864>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814508a0>] (comedi_unlocked_ioctl) from [<805a1864>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814508a0>] (comedi_unlocked_ioctl) from [<805a1864>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84097080 r9:00000003 r8:8663b980 r7:20000180 r6:40946400 r5:8663b981 r4:00000000 [<805a1620>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfd31fa8 to 0xdfd31ff0) 1fa0: 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fc00dc 1fe0: 76fbfe88 76fbfe78 00018ebc 00130810 r10:00000036 r9:84097080 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