8<--- cut here --- Unable to handle kernel paging request at virtual address fee0000b when write [fee0000b] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6081 Comm: syz.1.646 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 : [<81557fe0>] lr : [<81557fcc>] psr: 60000013 sp : ecbe9cb8 ip : ecbe9cb8 fp : ecbe9cd4 r10: 00000008 r9 : 00000004 r8 : ecbe9da4 r7 : 00000000 r6 : 0000009b r5 : 83fa0e40 r4 : 0000000b r3 : 0000009b r2 : fee0000b r1 : 00000001 r0 : 83fa0e40 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 873dd640 DAC: 00000000 Register r0 information: slab kmalloc-192 start 83fa0e40 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:974 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 83fa0e40 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 0xecbe8000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2790 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xecbe8000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2790 Register r12 information: 2-page vmalloc region starting at 0xecbe8000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2790 Process syz.1.646 (pid: 6081, stack limit = 0xecbe8000) Stack: (0xecbe9cb8 to 0xecbea000) 9ca0: 81557f80 00000008 9cc0: 83fa0e40 00000000 ecbe9cf4 ecbe9cd8 81557cbc 81557f8c 00000008 805781b0 9ce0: 86a2a000 86a2a000 ecbe9d14 ecbe9cf8 81558074 81557c70 83fa0e40 00000000 9d00: 86a2a000 00000000 ecbe9d54 ecbe9d18 81558224 81557ff8 ffffffff 00000004 9d20: 8341e340 00000000 00000000 835dfba8 83fa0e40 00000000 ecbe9d90 83fa0e40 9d40: 00000000 83737408 ecbe9d8c ecbe9d58 81546c1c 815581bc 40946400 00000000 9d60: ecbe9d7c 20001900 83fa0e40 b5403587 40946400 00000003 0000000b 85f2be80 9d80: ecbe9e4c ecbe9d90 81542438 81546b20 35353238 00000000 00000000 00000000 9da0: 00000000 00000008 00000002 00000400 000f0000 0000000c 00000000 00000fff 9dc0: 4c95238c 0000000a 00001000 00000802 00001600 00000096 20000001 00000809 9de0: 00000003 00000006 00000002 00000402 00000008 0000decf 00000003 0000000b 9e00: 000003ff 00000072 00000003 000000ef fffff6fb 000002a4 08000004 dffffffd 9e20: 00000000 baf8631d 00000000 873cd100 83fa0e40 20001900 40946400 00000003 9e40: ecbe9f14 ecbe9e50 81543748 81542378 8276ba64 850b7a28 00000064 84525ef4 9e60: ecbe9ee4 ecbe9e70 8085ce0c 8085316c 00000064 83fa0e70 00000000 ecbe9e90 9e80: 00000000 862f8d10 840d4c38 40946400 0000000b 00000000 ecbe9e84 00000000 9ea0: 00000000 00000000 00000000 00000000 00000000 baf8631d 00000000 873cd100 9ec0: 40946400 20001900 20001900 873cd100 0000000b 85f2be80 ecbe9ef4 ecbe9ee8 9ee0: 8085cf3c baf8631d ecbe9f14 00000000 873cd101 40946400 20001900 873cd100 9f00: 0000000b 85f2be80 ecbe9fa4 ecbe9f18 805f22c4 81543400 ecac8b10 85f2be80 9f20: ecbe9f3c ecbe9f30 81c0c9d0 81c0c89c ecbe9f54 ecbe9f40 8025cbac 80292058 9f40: ecbe9fb0 40000000 ecbe9f84 ecbe9f58 80222c2c 8025cb64 00000000 8341a10c 9f60: ecbe9fb0 0013ee90 ecac8b10 80222b80 00000000 baf8631d ecbe9fac 00000000 9f80: 00000000 00356310 00000036 8020029c 85f2be80 00000036 00000000 ecbe9fa8 9fa0: 80200060 805f208c 00000000 00000000 0000000b 40946400 20001900 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f500dc 9fe0: 76f4fe88 76f4fe78 0001903c 00130cf0 60000010 0000000b 00000000 00000000 Call trace: [<81557f80>] (subdev_8255_io) from [<81557cbc>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:83fa0e40 r5:00000008 r4:81557f80 [<81557c64>] (subdev_8255_do_config) from [<81558074>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81557c64>] (subdev_8255_do_config) from [<81558074>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86a2a000 [<81557fec>] (subdev_8255_io_init) from [<81558224>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<81557fec>] (subdev_8255_io_init) from [<81558224>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:86a2a000 r5:00000000 r4:83fa0e40 [<815581b0>] (dev_8255_attach) from [<81546c1c>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:83737408 r9:00000000 r8:83fa0e40 r7:ecbe9d90 r6:00000000 r5:83fa0e40 r4:835dfba8 [<81546b14>] (comedi_device_attach) from [<81542438>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:931) r10:85f2be80 r9:0000000b r8:00000003 r7:40946400 r6:b5403587 r5:83fa0e40 r4:20001900 [<8154236c>] (do_devconfig_ioctl) from [<81543748>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2303) r8:00000003 r7:40946400 r6:20001900 r5:83fa0e40 r4:873cd100 [<815433f4>] (comedi_unlocked_ioctl) from [<805f22c4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<815433f4>] (comedi_unlocked_ioctl) from [<805f22c4>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<815433f4>] (comedi_unlocked_ioctl) from [<805f22c4>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<815433f4>] (comedi_unlocked_ioctl) from [<805f22c4>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:85f2be80 r9:0000000b r8:873cd100 r7:20001900 r6:40946400 r5:873cd101 r4:00000000 [<805f2080>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xecbe9fa8 to 0xecbe9ff0) 9fa0: 00000000 00000000 0000000b 40946400 20001900 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f500dc 9fe0: 76f4fe88 76f4fe78 0001903c 00130cf0 r10:00000036 r9:85f2be80 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