8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2c when write [fee04f2c] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4149 Comm: syz.1.90 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 : dfbe1cb8 ip : dfbe1cb8 fp : dfbe1cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f29 r6 : 0000009b r5 : 8410c180 r4 : 00004f2c r3 : 0000009b r2 : fee04f2c r1 : 00000001 r0 : 8410c180 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84f831c0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8410c180 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 8410c180 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 0xdfbe0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfbe0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.1.90 (pid: 4149, stack limit = 0xdfbe0000) Stack: (0xdfbe1cb8 to 0xdfbe2000) 1ca0: 813db338 8410c180 1cc0: 00004f29 00004f29 dfbe1cf4 dfbe1cd8 813db070 813db344 00004f29 8050a54c 1ce0: 851b4000 851b4000 dfbe1d14 dfbe1cf8 813db430 813db024 851b4000 8410c180 1d00: dfbe1da4 00004f29 dfbe1d54 dfbe1d18 813db624 813db3b0 82af1fe0 83951800 1d20: 828215f0 00000000 00000000 829d238c 8410c180 8410c1c4 dfbe1d90 8410c180 1d40: 00000000 82b25910 dfbe1d8c dfbe1d58 813ca520 813db574 20000180 00000000 1d60: dfbe1d7c 20000180 8410c180 b5403587 20000180 83c63000 40946400 00000003 1d80: dfbe1e4c dfbe1d90 813c606c 813ca424 35353238 00000000 00000000 00000000 1da0: 00000000 00004f29 00000005 00000007 00000004 00000001 0000000c 00001000 1dc0: 00000004 00000081 fffffffc 0000000f fffffffe 10000001 0000002f 00000002 1de0: 00000101 00000008 00400009 00000003 00000005 00000000 0000caa7 00000080 1e00: 00000000 00000007 02000e67 0000003c 00000071 fffffffe 00000000 00000004 1e20: 00000000 d31f2131 00000000 851df3c0 8410c180 20000180 20000180 83c63000 1e40: dfbe1f14 dfbe1e50 813c7038 813c5f78 00000000 00000000 00000000 d31f2131 1e60: 00000000 00000000 824625b4 0000005f 83c25600 8410c1b0 83d0ed8c 83c63000 1e80: dfbe1ee4 dfbe1e90 807a779c 8079db94 00000064 00000001 00000000 dfbe1eac 1ea0: 85a3f190 834e0550 00006400 0000000b dfbe1ea0 00000000 00000000 d31f2131 1ec0: 851df3c0 40946400 20000180 20000180 851df3c0 00000003 dfbe1ef4 dfbe1ee8 1ee0: 807a78bc d31f2131 dfbe1f14 40946400 00000000 851df3c1 20000180 851df3c0 1f00: 00000003 83c63000 dfbe1fa4 dfbe1f18 805789d0 813c6a68 ecac8b10 83c63000 1f20: dfbe1f3c dfbe1f30 81a608b8 81a60788 dfbe1f54 dfbe1f40 8025c484 8028d914 1f40: dfbe1fb0 40000000 dfbe1f84 dfbe1f58 802229ec 8025c440 00000000 8281cfb4 1f60: dfbe1fb0 0014ced0 ecac8b10 80222940 00000000 d31f2131 dfbe1fac 00000000 1f80: 00000000 00316308 00000036 8020029c 83c63000 00000036 00000000 dfbe1fa8 1fa0: 80200060 805788ac 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fd80bc 1fe0: 76fd7ec0 76fd7eb0 0001928c 00132970 60000010 00000003 00000000 00000000 Call trace: [<813db338>] (subdev_8255_io) from [<813db070>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f29 r6:00004f29 r5:8410c180 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) r4:851b4000 [<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) r7:00004f29 r6:dfbe1da4 r5:8410c180 r4:851b4000 [<813db568>] (dev_8255_attach) from [<813ca520>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:8410c180 r7:dfbe1d90 r6:8410c1c4 r5:8410c180 r4:829d238c [<813ca418>] (comedi_device_attach) from [<813c606c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83c63000 r7:20000180 r6:b5403587 r5:8410c180 r4:20000180 [<813c5f6c>] (do_devconfig_ioctl) from [<813c7038>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83c63000 r7:20000180 r6:20000180 r5:8410c180 r4:851df3c0 [<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) r10:83c63000 r9:00000003 r8:851df3c0 r7:20000180 r6:851df3c1 r5:00000000 r4:40946400 [<805788a0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbe1fa8 to 0xdfbe1ff0) 1fa0: 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fd80bc 1fe0: 76fd7ec0 76fd7eb0 0001928c 00132970 r10:00000036 r9:83c63000 r8:8020029c r7:00000036 r6:00316308 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