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: 3838 Comm: syz.1.4 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 : [<813b8ba0>] lr : [<813b8b8c>] psr: 60000013 sp : dfe8dcb8 ip : dfe8dcb8 fp : dfe8dcd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f29 r6 : 0000009b r5 : 84218cc0 r4 : 00004f2c r3 : 0000009b r2 : fee04f2c r1 : 00000001 r0 : 84218cc0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85b91e80 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84218cc0 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 84218cc0 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 0xdfe8c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfe8c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.1.4 (pid: 3838, stack limit = 0xdfe8c000) Stack: (0xdfe8dcb8 to 0xdfe8e000) dca0: 813b8b40 84218cc0 dcc0: 00004f29 00004f29 dfe8dcf4 dfe8dcd8 813b8878 813b8b4c 00004f29 80503b64 dce0: 84984000 84984000 dfe8dd14 dfe8dcf8 813b8c38 813b882c 84984000 84218cc0 dd00: dfe8dda4 00004f29 dfe8dd54 dfe8dd18 813b8e2c 813b8bb8 82ae3da0 83854100 dd20: 828215b0 00000000 00000000 829d0144 84218cc0 84218d04 dfe8dd90 84218cc0 dd40: 00000000 82b16f40 dfe8dd8c dfe8dd58 813a7d34 813b8d7c 200000c0 00000000 dd60: dfe8dd7c 200000c0 84218cc0 b5403587 200000c0 83b4b000 40946400 00000003 dd80: dfe8de4c dfe8dd90 813a3880 813a7c38 35353238 00000000 00000000 00000000 dda0: 00000000 00004f29 00000005 00000003 00000004 00000001 0000000c 00000012 ddc0: 00000004 00000081 fffffffc 00000002 fffffffe 00000001 00000001 00000002 dde0: 00000101 00000008 00400009 00000003 00000005 00000099 0000caa7 00000080 de00: 00000000 00000007 02000e67 0000003c 00000008 fffffffe 00000000 fffffff8 de20: 00000000 9d174e3c 00000000 85afca80 84218cc0 200000c0 200000c0 83b4b000 de40: dfe8df14 dfe8de50 813a484c 813a378c 00000000 00000000 00000000 9d174e3c de60: 00000000 00000000 8247054c 0000005f 84132858 84218cf0 842598c4 83b4b000 de80: dfe8dee4 dfe8de90 80797aa4 8078de08 00000064 00000001 00000000 dfe8deac dea0: 85b9c6d0 83430990 00006400 0000000b dfe8dea0 00000000 00000000 9d174e3c dec0: 85afca80 40946400 200000c0 200000c0 85afca80 00000003 dfe8def4 dfe8dee8 dee0: 80797bc4 9d174e3c dfe8df14 40946400 00000000 85afca81 200000c0 85afca80 df00: 00000003 83b4b000 dfe8dfa4 dfe8df18 8056cdc8 813a427c ecac8b10 83b4b000 df20: dfe8df3c dfe8df30 81a39db8 81a39c88 dfe8df54 dfe8df40 8025e490 8028ef6c df40: dfe8dfb0 40000000 dfe8df84 dfe8df58 802229ec 8025e44c 00000000 8281cddc df60: dfe8dfb0 0014c820 ecac8b10 80222940 00000000 9d174e3c dfe8dfac 00000000 df80: 00000000 002f6308 00000036 8020029c 83b4b000 00000036 00000000 dfe8dfa8 dfa0: 80200060 8056cca4 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f580bc dfe0: 76f57ec0 76f57eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813b8b40>] (subdev_8255_io) from [<813b8878>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f29 r6:00004f29 r5:84218cc0 r4:813b8b40 [<813b8820>] (subdev_8255_do_config) from [<813b8c38>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813b8820>] (subdev_8255_do_config) from [<813b8c38>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:84984000 [<813b8bac>] (subdev_8255_io_init) from [<813b8e2c>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813b8bac>] (subdev_8255_io_init) from [<813b8e2c>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f29 r6:dfe8dda4 r5:84218cc0 r4:84984000 [<813b8d70>] (dev_8255_attach) from [<813a7d34>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b16f40 r9:00000000 r8:84218cc0 r7:dfe8dd90 r6:84218d04 r5:84218cc0 r4:829d0144 [<813a7c2c>] (comedi_device_attach) from [<813a3880>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83b4b000 r7:200000c0 r6:b5403587 r5:84218cc0 r4:200000c0 [<813a3780>] (do_devconfig_ioctl) from [<813a484c>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83b4b000 r7:200000c0 r6:200000c0 r5:84218cc0 r4:85afca80 [<813a4270>] (comedi_unlocked_ioctl) from [<8056cdc8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a4270>] (comedi_unlocked_ioctl) from [<8056cdc8>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a4270>] (comedi_unlocked_ioctl) from [<8056cdc8>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a4270>] (comedi_unlocked_ioctl) from [<8056cdc8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:83b4b000 r9:00000003 r8:85afca80 r7:200000c0 r6:85afca81 r5:00000000 r4:40946400 [<8056cc98>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfe8dfa8 to 0xdfe8dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f580bc dfe0: 76f57ec0 76f57eb0 0001948c 001322c0 r10:00000036 r9:83b4b000 r8:8020029c r7:00000036 r6:002f6308 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