8<--- cut here --- Unable to handle kernel paging request at virtual address fee02003 when write [fee02003] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 15099 Comm: syz.2.3360 Not tainted syzkaller #0 PREEMPT 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 : [<814e3de4>] lr : [<814e3dd0>] psr: 60000013 sp : dfb75cb8 ip : dfb75cb8 fp : dfb75cd4 r10: 00002000 r9 : 00000004 r8 : dfb75da4 r7 : 00000000 r6 : 0000009b r5 : 83019cc0 r4 : 00002003 r3 : 0000009b r2 : fee02003 r1 : 00000001 r0 : 83019cc0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85eab500 DAC: 00000000 Register r0 information: slab kmalloc-192 start 83019cc0 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 83019cc0 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 0xdfb74000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2771 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfb74000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2771 Register r12 information: 2-page vmalloc region starting at 0xdfb74000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2771 Process syz.2.3360 (pid: 15099, stack limit = 0xdfb74000) Stack: (0xdfb75cb8 to 0xdfb76000) 5ca0: 814e3d84 00002000 5cc0: 83019cc0 00000000 dfb75cf4 dfb75cd8 814e3ac0 814e3d90 00002000 80558818 5ce0: 86ea5e40 86ea5e40 dfb75d14 dfb75cf8 814e3e78 814e3a74 83019cc0 00000000 5d00: 86ea5e40 00000000 dfb75d54 dfb75d18 814e4028 814e3dfc ffffffff 00000004 5d20: 82a1e300 00000000 00000000 82bd917c 83019cc0 00000000 dfb75d90 83019cc0 5d40: 00000000 82d317a0 dfb75d8c dfb75d58 814d29b0 814e3fc0 40946400 00000000 5d60: dfb75d7c 20000580 83019cc0 b5403587 40946400 00000003 00000003 849e4b00 5d80: dfb75e4c dfb75d90 814ce1b4 814d28b4 35353238 00000000 00000000 00000000 5da0: 00000000 00002000 00000000 00000004 00008000 0000ffff 00000002 0000c6b9 5dc0: 00000006 54c6cff3 000000fa ffffffff 00000003 fbfffff7 00400001 10000006 5de0: 00000400 00000000 0000007f 00000003 40000003 0020008d 00000004 00000007 5e00: 20001e5b 00080003 00000e69 ffffffff 00000007 00004006 0000008a 00000000 5e20: 00000000 f4458aaf 00000000 853f9f80 83019cc0 20000580 40946400 00000003 5e40: dfb75f14 dfb75e50 814cf4dc 814ce0f4 00000000 f4458aaf 00000000 00000000 5e60: 8252884c dfb75ea4 0000005f 84187678 00000064 83019cf0 dfb75ee4 dfb75e88 5e80: 80828c60 8081efec 00000064 00000001 00000000 dfb75ea4 85c57c10 834255d8 5ea0: 00006400 0000000b dfb75e98 00000000 00000000 f4458aaf 00000000 853f9f80 5ec0: 40946400 20000580 20000580 853f9f80 00000003 849e4b00 dfb75ef4 dfb75ee8 5ee0: 80828d94 f4458aaf dfb75f14 00000000 853f9f81 40946400 20000580 853f9f80 5f00: 00000003 849e4b00 dfb75fa4 dfb75f18 805d0f0c 814cf194 ecac8b10 849e4b00 5f20: dfb75f3c dfb75f30 81bac9c0 81bac88c dfb75f54 dfb75f40 8025b9d4 8028f74c 5f40: dfb75fb0 40000000 dfb75f84 dfb75f58 80221bdc 8025b98c 00000000 82a1a04c 5f60: dfb75fb0 0013ec10 ecac8b10 80221b30 00000000 f4458aaf dfb75fac 00000000 5f80: 00000000 00356310 00000036 8020029c 849e4b00 00000036 00000000 dfb75fa8 5fa0: 80200060 805d0cd4 00000000 00000000 00000003 40946400 20000580 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f520dc 5fe0: 76f51e88 76f51e78 00018fb8 00130a70 60000010 00000003 00000000 00000000 Call trace: [<814e3d84>] (subdev_8255_io) from [<814e3ac0>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:83019cc0 r5:00002000 r4:814e3d84 [<814e3a68>] (subdev_8255_do_config) from [<814e3e78>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814e3a68>] (subdev_8255_do_config) from [<814e3e78>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86ea5e40 [<814e3df0>] (subdev_8255_io_init) from [<814e4028>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814e3df0>] (subdev_8255_io_init) from [<814e4028>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:86ea5e40 r5:00000000 r4:83019cc0 [<814e3fb4>] (dev_8255_attach) from [<814d29b0>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d317a0 r9:00000000 r8:83019cc0 r7:dfb75d90 r6:00000000 r5:83019cc0 r4:82bd917c [<814d28a8>] (comedi_device_attach) from [<814ce1b4>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:849e4b00 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:83019cc0 r4:20000580 [<814ce0e8>] (do_devconfig_ioctl) from [<814cf4dc>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000580 r5:83019cc0 r4:853f9f80 [<814cf188>] (comedi_unlocked_ioctl) from [<805d0f0c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814cf188>] (comedi_unlocked_ioctl) from [<805d0f0c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814cf188>] (comedi_unlocked_ioctl) from [<805d0f0c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814cf188>] (comedi_unlocked_ioctl) from [<805d0f0c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:849e4b00 r9:00000003 r8:853f9f80 r7:20000580 r6:40946400 r5:853f9f81 r4:00000000 [<805d0cc8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb75fa8 to 0xdfb75ff0) 5fa0: 00000000 00000000 00000003 40946400 20000580 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f520dc 5fe0: 76f51e88 76f51e78 00018fb8 00130a70 r10:00000036 r9:849e4b00 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