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: 19068 Comm: syz.5.2793 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 : [<813dbb18>] lr : [<813dbb04>] psr: 60000013 sp : dfb2dcb8 ip : dfb2dcb8 fp : dfb2dcd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 840fa9c0 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 840fa9c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86c37c00 DAC: 00000000 Register r0 information: slab kmalloc-192 start 840fa9c0 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 840fa9c0 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: non-paged memory Register r9 information: NULL pointer Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xdfb2c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfb2c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.5.2793 (pid: 19068, stack limit = 0xdfb2c000) Stack: (0xdfb2dcb8 to 0xdfb2e000) dca0: 813dbab8 840fa9c0 dcc0: 00004f27 00004f27 dfb2dcf4 dfb2dcd8 813db7f0 813dbac4 00004f27 8050a7fc dce0: 8614d400 8614d400 dfb2dd14 dfb2dcf8 813dbbb0 813db7a4 8614d400 840fa9c0 dd00: dfb2dda4 00004f27 dfb2dd54 dfb2dd18 813dbda4 813dbb30 82af1fe0 86dfd380 dd20: 828215f0 00000000 00000000 829d23cc 840fa9c0 840faa04 dfb2dd90 840fa9c0 dd40: 00000000 82b25910 dfb2dd8c dfb2dd58 813cac9c 813dbcf4 200000c0 00000000 dd60: dfb2dd7c 200000c0 840fa9c0 b5403587 200000c0 84b26c00 40946400 00000003 dd80: dfb2de4c dfb2dd90 813c67e8 813caba0 35353238 00000000 00000000 00000000 dda0: 00000000 00004f27 00000005 00000002 00000401 00000001 00000cc7 00000fff ddc0: 00000000 00000001 000003ff 00000006 00001600 00000001 00000001 00000009 dde0: 0000e1cb 00000006 00000004 00000000 00000395 8000008b fffffffe 0000000b de00: fffffff5 ffffead7 00000003 0000003c fffffffa 00000004 08000000 dffffffa de20: 00000000 5afa5d2c 00000000 84d6e3c0 840fa9c0 200000c0 200000c0 84b26c00 de40: dfb2df14 dfb2de50 813c77b4 813c66f4 00000000 00000000 00000000 5afa5d2c de60: 00000000 00000000 824625b4 0000005f 84115600 840fa9f0 841d5294 84b26c00 de80: dfb2dee4 dfb2de90 807a7d9c 8079e194 00000064 00000001 00000000 dfb2deac dea0: 85957c10 83435198 00006400 0000000b dfb2dea0 00000000 00000000 5afa5d2c dec0: 84d6e3c0 40946400 200000c0 200000c0 84d6e3c0 00000003 dfb2def4 dfb2dee8 dee0: 807a7ebc 5afa5d2c dfb2df14 40946400 00000000 84d6e3c1 200000c0 84d6e3c0 df00: 00000003 84b26c00 dfb2dfa4 dfb2df18 80578f00 813c71e4 ecac8b10 84b26c00 df20: dfb2df3c dfb2df30 81a61300 81a611d0 dfb2df54 dfb2df40 8025c484 8028d914 df40: dfb2dfb0 40000000 dfb2df84 dfb2df58 802229ec 8025c440 00000000 8281cfb4 df60: dfb2dfb0 0014ced0 ecac8b10 80222940 00000000 5afa5d2c dfb2dfac 00000000 df80: 00000000 00316448 00000036 8020029c 84b26c00 00000036 00000000 dfb2dfa8 dfa0: 80200060 80578ddc 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f7f0bc dfe0: 76f7eec0 76f7eeb0 00019294 00132970 60000010 00000003 00000000 00000000 Call trace: [<813dbab8>] (subdev_8255_io) from [<813db7f0>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:840fa9c0 r4:813dbab8 [<813db798>] (subdev_8255_do_config) from [<813dbbb0>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813db798>] (subdev_8255_do_config) from [<813dbbb0>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:8614d400 [<813dbb24>] (subdev_8255_io_init) from [<813dbda4>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813dbb24>] (subdev_8255_io_init) from [<813dbda4>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:dfb2dda4 r5:840fa9c0 r4:8614d400 [<813dbce8>] (dev_8255_attach) from [<813cac9c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:840fa9c0 r7:dfb2dd90 r6:840faa04 r5:840fa9c0 r4:829d23cc [<813cab94>] (comedi_device_attach) from [<813c67e8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:84b26c00 r7:200000c0 r6:b5403587 r5:840fa9c0 r4:200000c0 [<813c66e8>] (do_devconfig_ioctl) from [<813c77b4>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:84b26c00 r7:200000c0 r6:200000c0 r5:840fa9c0 r4:84d6e3c0 [<813c71d8>] (comedi_unlocked_ioctl) from [<80578f00>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c71d8>] (comedi_unlocked_ioctl) from [<80578f00>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c71d8>] (comedi_unlocked_ioctl) from [<80578f00>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c71d8>] (comedi_unlocked_ioctl) from [<80578f00>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:84b26c00 r9:00000003 r8:84d6e3c0 r7:200000c0 r6:84d6e3c1 r5:00000000 r4:40946400 [<80578dd0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb2dfa8 to 0xdfb2dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f7f0bc dfe0: 76f7eec0 76f7eeb0 00019294 00132970 r10:00000036 r9:84b26c00 r8:8020029c r7:00000036 r6:00316448 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