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: 3835 Comm: syz.1.7 Not tainted 6.17.0-rc1-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 : [<813b7dd0>] lr : [<813b7dbc>] psr: 60000013 sp : dfeb9cb8 ip : dfeb9cb8 fp : dfeb9cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 84014c00 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 84014c00 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85b09a00 DAC: 00000000 Register r0 information: slab kmalloc-192 start 84014c00 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 84014c00 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 0xdfeb8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfeb8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.1.7 (pid: 3835, stack limit = 0xdfeb8000) Stack: (0xdfeb9cb8 to 0xdfeba000) 9ca0: 813b7d70 84014c00 9cc0: 00004f27 00004f27 dfeb9cf4 dfeb9cd8 813b7aa8 813b7d7c 00004f27 80503c30 9ce0: 85a41000 85a41000 dfeb9d14 dfeb9cf8 813b7e68 813b7a5c 85a41000 84014c00 9d00: dfeb9da4 00004f27 dfeb9d54 dfeb9d18 813b805c 813b7de8 dfeb9d3c dfeb9d28 9d20: 81a3c6b0 00000000 813a2a3c 829d0084 84014c00 84014c44 dfeb9d90 84014c00 9d40: 00000000 82b16f00 dfeb9d8c dfeb9d58 813a6f60 813b7fac 200000c0 00000000 9d60: 84b4a400 200000c0 84014c00 b5403587 200000c0 84b4a400 40946400 00000003 9d80: dfeb9e4c dfeb9d90 813a2ae0 813a6e64 35353238 00000000 00000000 00000000 9da0: 00000000 00004f27 00000005 00000002 00000401 00000001 00000cc7 00000fff 9dc0: 5c952399 00000005 000003ff 00000802 00001600 00000001 00000001 00000009 9de0: 0000e1cb 00000006 00000004 00000003 00000395 80000089 fffffffd 00000000 9e00: fffffff5 ffffeadb 00000003 0000003c 00000008 00000004 08000000 dffffffa 9e20: 00000000 84a52e24 00000000 85aa1780 84014c00 200000c0 200000c0 84b4a400 9e40: dfeb9f14 dfeb9e50 813a3aac 813a29ec 00000000 00000000 00000000 84a52e24 9e60: 00000000 00000000 8247054c 0000005f 83b95058 84014c30 84192444 84b4a400 9e80: dfeb9ee4 dfeb9e90 80797824 8078db88 00000064 00000001 00000000 dfeb9eac 9ea0: 84a189d0 834e1a18 00006400 0000000b dfeb9ea0 00000000 00000000 84a52e24 9ec0: 85aa1780 40946400 200000c0 200000c0 85aa1780 00000007 dfeb9ef4 dfeb9ee8 9ee0: 80797944 84a52e24 dfeb9f14 40946400 00000000 85aa1781 200000c0 85aa1780 9f00: 00000007 84b4a400 dfeb9fa4 dfeb9f18 8056cdf8 813a34dc ecac8b10 84b4a400 9f20: dfeb9f3c dfeb9f30 81a38778 81a38648 dfeb9f54 dfeb9f40 8025e490 8028ef8c 9f40: dfeb9fb0 40000000 dfeb9f84 dfeb9f58 802229ec 8025e44c 00000000 8281cddc 9f60: dfeb9fb0 0014c820 ecac8b10 80222940 00000000 84a52e24 dfeb9fac 00000000 9f80: 00000000 002f6448 00000036 8020029c 84b4a400 00000036 00000000 dfeb9fa8 9fa0: 80200060 8056ccd4 00000000 00000000 00000007 40946400 200000c0 00000000 9fc0: 00000000 00000000 002f6448 00000036 002e0000 00000000 00006364 76fab0bc 9fe0: 76faaec0 76faaeb0 0001948c 001322c0 60000010 00000007 00000000 00000000 Call trace: [<813b7d70>] (subdev_8255_io) from [<813b7aa8>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:84014c00 r4:813b7d70 [<813b7a50>] (subdev_8255_do_config) from [<813b7e68>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813b7a50>] (subdev_8255_do_config) from [<813b7e68>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85a41000 [<813b7ddc>] (subdev_8255_io_init) from [<813b805c>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813b7ddc>] (subdev_8255_io_init) from [<813b805c>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:dfeb9da4 r5:84014c00 r4:85a41000 [<813b7fa0>] (dev_8255_attach) from [<813a6f60>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r10:82b16f00 r9:00000000 r8:84014c00 r7:dfeb9d90 r6:84014c44 r5:84014c00 r4:829d0084 [<813a6e58>] (comedi_device_attach) from [<813a2ae0>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:84b4a400 r7:200000c0 r6:b5403587 r5:84014c00 r4:200000c0 [<813a29e0>] (do_devconfig_ioctl) from [<813a3aac>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:84b4a400 r7:200000c0 r6:200000c0 r5:84014c00 r4:85aa1780 [<813a34d0>] (comedi_unlocked_ioctl) from [<8056cdf8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a34d0>] (comedi_unlocked_ioctl) from [<8056cdf8>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a34d0>] (comedi_unlocked_ioctl) from [<8056cdf8>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a34d0>] (comedi_unlocked_ioctl) from [<8056cdf8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:84b4a400 r9:00000007 r8:85aa1780 r7:200000c0 r6:85aa1781 r5:00000000 r4:40946400 [<8056ccc8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfeb9fa8 to 0xdfeb9ff0) 9fa0: 00000000 00000000 00000007 40946400 200000c0 00000000 9fc0: 00000000 00000000 002f6448 00000036 002e0000 00000000 00006364 76fab0bc 9fe0: 76faaec0 76faaeb0 0001948c 001322c0 r10:00000036 r9:84b4a400 r8:8020029c r7:00000036 r6:002f6448 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