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: 0 UID: 0 PID: 10924 Comm: syz.2.1814 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 : [<813db398>] lr : [<813db384>] psr: 60000013 sp : e0145cb8 ip : e0145cb8 fp : e0145cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 8404e600 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8404e600 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84e775c0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8404e600 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 8404e600 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 0xe0144000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xe0144000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.2.1814 (pid: 10924, stack limit = 0xe0144000) Stack: (0xe0145cb8 to 0xe0146000) 5ca0: 813db338 8404e600 5cc0: 00004f27 00004f27 e0145cf4 e0145cd8 813db070 813db344 00004f27 8050a54c 5ce0: 8412e000 8412e000 e0145d14 e0145cf8 813db430 813db024 8412e000 8404e600 5d00: e0145da4 00004f27 e0145d54 e0145d18 813db624 813db3b0 82af1fe0 9849ee00 5d20: 828215f0 00000000 00000000 829d238c 8404e600 8404e644 e0145d90 8404e600 5d40: 00000000 82b25910 e0145d8c e0145d58 813ca520 813db574 200000c0 00000000 5d60: e0145d7c 200000c0 8404e600 b5403587 200000c0 84dd6000 40946400 00000003 5d80: e0145e4c e0145d90 813c606c 813ca424 35353238 00000000 00000000 00000000 5da0: 00000000 00004f27 00000005 00000002 00000401 00000001 00000cc6 00000fff 5dc0: 5c952399 00000005 000003ff 00000802 00001600 00000001 00000001 00000009 5de0: 0000e1cb 00000006 00000004 00000003 00000395 80000089 fffffffd 00000000 5e00: fffffff5 ffffeadb 00000003 0000003c 00000008 00000004 08000000 dffffffa 5e20: 00000000 f6191f9b 00000000 8556ef00 8404e600 200000c0 200000c0 84dd6000 5e40: e0145f14 e0145e50 813c7038 813c5f78 00000000 00000000 00000000 f6191f9b 5e60: 00000000 00000000 824625b4 0000005f 83c9ae20 8404e630 840930e4 84dd6000 5e80: e0145ee4 e0145e90 807a779c 8079db94 00000064 00000001 00000000 e0145eac 5ea0: 85a08190 834d9e58 00006400 0000000b e0145ea0 00000000 00000000 f6191f9b 5ec0: 8556ef00 40946400 200000c0 200000c0 8556ef00 00000005 e0145ef4 e0145ee8 5ee0: 807a78bc f6191f9b e0145f14 40946400 00000000 8556ef01 200000c0 8556ef00 5f00: 00000005 84dd6000 e0145fa4 e0145f18 805789d0 813c6a68 ecac8b10 84dd6000 5f20: e0145f3c e0145f30 81a608b8 81a60788 e0145f54 e0145f40 8025c484 8028d914 5f40: e0145fb0 40000000 e0145f84 e0145f58 802229ec 8025c440 00000000 8281cfb4 5f60: e0145fb0 0014ced0 ecac8b10 80222940 00000000 f6191f9b e0145fac 00000000 5f80: 00000000 003163a8 00000036 8020029c 84dd6000 00000036 00000000 e0145fa8 5fa0: 80200060 805788ac 00000000 00000000 00000005 40946400 200000c0 00000000 5fc0: 00000000 00000000 003163a8 00000036 00300000 00000000 00006364 76f990bc 5fe0: 76f98ec0 76f98eb0 0001928c 00132970 60000010 00000005 00000000 00000000 Call trace: [<813db338>] (subdev_8255_io) from [<813db070>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:8404e600 r4:813db338 [<813db018>] (subdev_8255_do_config) from [<813db430>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813db018>] (subdev_8255_do_config) from [<813db430>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:8412e000 [<813db3a4>] (subdev_8255_io_init) from [<813db624>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813db3a4>] (subdev_8255_io_init) from [<813db624>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:e0145da4 r5:8404e600 r4:8412e000 [<813db568>] (dev_8255_attach) from [<813ca520>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:8404e600 r7:e0145d90 r6:8404e644 r5:8404e600 r4:829d238c [<813ca418>] (comedi_device_attach) from [<813c606c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:84dd6000 r7:200000c0 r6:b5403587 r5:8404e600 r4:200000c0 [<813c5f6c>] (do_devconfig_ioctl) from [<813c7038>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:84dd6000 r7:200000c0 r6:200000c0 r5:8404e600 r4:8556ef00 [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:84dd6000 r9:00000005 r8:8556ef00 r7:200000c0 r6:8556ef01 r5:00000000 r4:40946400 [<805788a0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0145fa8 to 0xe0145ff0) 5fa0: 00000000 00000000 00000005 40946400 200000c0 00000000 5fc0: 00000000 00000000 003163a8 00000036 00300000 00000000 00006364 76f990bc 5fe0: 76f98ec0 76f98eb0 0001928c 00132970 r10:00000036 r9:84dd6000 r8:8020029c r7:00000036 r6:003163a8 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