8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2a when write [fee04f2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 18304 Comm: syz.7.2142 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 : [<8143e4a8>] lr : [<8143e494>] psr: 60000013 sp : ea521cb8 ip : ea521cb8 fp : ea521cd4 r10: 00000000 r9 : 00000084 r8 : ea521da4 r7 : 00004f27 r6 : 0000009b r5 : 833a0180 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 833a0180 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 862d2280 DAC: 00000000 Register r0 information: slab kmalloc-192 start 833a0180 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:1055 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 833a0180 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: 2-page vmalloc region starting at 0xea520000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xea520000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xea520000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.7.2142 (pid: 18304, stack limit = 0xea520000) Stack: (0xea521cb8 to 0xea522000) 1ca0: 8143e448 00004f27 1cc0: 833a0180 00004f27 ea521cf4 ea521cd8 8143e184 8143e454 00004f27 80522740 1ce0: 8634f800 8634f800 ea521d14 ea521cf8 8143e53c 8143e138 833a0180 00000000 1d00: 8634f800 00004f27 ea521d54 ea521d18 8143e6ec 8143e4c0 82afe10c 83b38e80 1d20: 828217c0 00000000 00000000 829d6e04 833a0180 00000000 ea521d90 833a0180 1d40: 00000000 82b2efdc ea521d8c ea521d58 8142d030 8143e684 40946400 00000000 1d60: ea521d7c 200000c0 833a0180 b5403587 40946400 00000003 00000007 83968000 1d80: ea521e4c ea521d90 8142883c 8142cf30 35353238 00000000 00000000 00000000 1da0: 00000000 00004f27 00000005 00000002 00000401 00000001 00000cc7 00000fff 1dc0: 5c952399 80000005 000003ff 00000802 00001600 00000001 00000000 00000009 1de0: 0000e1cb 00000006 00000004 00000003 00000395 80000089 fffffffd 00000000 1e00: fffffff5 ffffeadc 00000003 0000003c 00000008 00000004 08000000 dffffffa 1e20: 00000000 e5b0cb27 00000000 868e2b40 833a0180 200000c0 40946400 00000003 1e40: ea521f14 ea521e50 81429b60 81428774 00000000 e5b0cb27 00000000 00000000 1e60: 824b857c ea521ea4 0000005f 83a5ec28 00000064 833a01b0 ea521ee4 ea521e88 1e80: 807cda48 807c3e20 00000064 00000001 00000000 ea521ea4 830ce610 834f37f8 1ea0: 00006400 0000000b ea521e98 00000000 00000000 e5b0cb27 00000000 868e2b40 1ec0: 40946400 200000c0 200000c0 868e2b40 00000007 83968000 ea521ef4 ea521ee8 1ee0: 807cdb78 e5b0cb27 ea521f14 00000000 868e2b41 40946400 200000c0 868e2b40 1f00: 00000007 83968000 ea521fa4 ea521f18 8058f90c 81429818 ecac8b10 83968000 1f20: ea521f3c ea521f30 81ae1a14 81ae18e0 ea521f54 ea521f40 8025a868 8028c368 1f40: ea521fb0 40000000 ea521f84 ea521f58 80220bf8 8025a824 00000000 8281d2bc 1f60: ea521fb0 0013e480 ecac8b10 80220b4c 00000000 e5b0cb27 ea521fac 00000000 1f80: 00000000 00346310 00000036 8020029c 83968000 00000036 00000000 ea521fa8 1fa0: 80200060 8058f6d4 00000000 00000000 00000007 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f0e0dc 1fe0: 76f0de88 76f0de78 00018ba0 001302e0 60000010 00000007 00000000 00000000 Call trace: [<8143e448>] (subdev_8255_io) from [<8143e184>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:833a0180 r5:00004f27 r4:8143e448 [<8143e12c>] (subdev_8255_do_config) from [<8143e53c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8143e12c>] (subdev_8255_do_config) from [<8143e53c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8634f800 [<8143e4b4>] (subdev_8255_io_init) from [<8143e6ec>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8143e4b4>] (subdev_8255_io_init) from [<8143e6ec>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:8634f800 r5:00000000 r4:833a0180 [<8143e678>] (dev_8255_attach) from [<8142d030>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2efdc r9:00000000 r8:833a0180 r7:ea521d90 r6:00000000 r5:833a0180 r4:829d6e04 [<8142cf24>] (comedi_device_attach) from [<8142883c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:83968000 r9:00000007 r8:00000003 r7:40946400 r6:b5403587 r5:833a0180 r4:200000c0 [<81428768>] (do_devconfig_ioctl) from [<81429b60>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:833a0180 r4:868e2b40 [<8142980c>] (comedi_unlocked_ioctl) from [<8058f90c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142980c>] (comedi_unlocked_ioctl) from [<8058f90c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142980c>] (comedi_unlocked_ioctl) from [<8058f90c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142980c>] (comedi_unlocked_ioctl) from [<8058f90c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83968000 r9:00000007 r8:868e2b40 r7:200000c0 r6:40946400 r5:868e2b41 r4:00000000 [<8058f6c8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea521fa8 to 0xea521ff0) 1fa0: 00000000 00000000 00000007 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f0e0dc 1fe0: 76f0de88 76f0de78 00018ba0 001302e0 r10:00000036 r9:83968000 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