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: 9945 Comm: syz.3.1257 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 : [<813b7f10>] lr : [<813b7efc>] psr: 60000013 sp : dfe91cb8 ip : dfe91cb8 fp : dfe91cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 841dd900 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 841dd900 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84ce5a40 DAC: fffffffd Register r0 information: slab kmalloc-192 start 841dd900 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 841dd900 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 0xdfe90000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfe90000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.3.1257 (pid: 9945, stack limit = 0xdfe90000) Stack: (0xdfe91cb8 to 0xdfe92000) 1ca0: 813b7eb0 841dd900 1cc0: 00004f27 00004f27 dfe91cf4 dfe91cd8 813b7be8 813b7ebc 00004f27 80503d54 1ce0: 85ab8000 85ab8000 dfe91d14 dfe91cf8 813b7fa8 813b7b9c 85ab8000 841dd900 1d00: dfe91da4 00004f27 dfe91d54 dfe91d18 813b819c 813b7f28 82ae3d60 83fed100 1d20: 82821598 00000000 00000000 829d0084 841dd900 841dd944 dfe91d90 841dd900 1d40: 00000000 82b16f00 dfe91d8c dfe91d58 813a70a0 813b80ec 200000c0 00000000 1d60: dfe91d7c 200000c0 841dd900 b5403587 200000c0 8617e000 40946400 00000003 1d80: dfe91e4c dfe91d90 813a2c20 813a6fa4 35353238 00000000 00000000 00000000 1da0: 00000000 00004f27 00000005 00000002 00000401 00000001 00000cc7 00000fff 1dc0: 5c952399 00000005 000003ff 00000802 00001600 00000001 00000001 00000009 1de0: 0000e1cb 00000006 00000004 00000003 00000395 80000089 fffffffd 00000000 1e00: fffffff5 ffffeadb 00000003 0000003c 00000008 00000004 08000000 dffffffa 1e20: 00000000 097bc3fa 00000000 84c75d80 841dd900 200000c0 200000c0 8617e000 1e40: dfe91f14 dfe91e50 813a3bec 813a2b2c 00000000 00000000 00000000 097bc3fa 1e60: 00000000 00000000 8247054c 0000005f 83efe858 841dd930 8420a5ac 8617e000 1e80: dfe91ee4 dfe91e90 8079795c 8078dcc0 00000064 00000001 00000000 dfe91eac 1ea0: 8587f6d0 834ec000 00006400 0000000b dfe91ea0 00000000 00000000 097bc3fa 1ec0: 84c75d80 40946400 200000c0 200000c0 84c75d80 00000005 dfe91ef4 dfe91ee8 1ee0: 80797a7c 097bc3fa dfe91f14 40946400 00000000 84c75d81 200000c0 84c75d80 1f00: 00000005 8617e000 dfe91fa4 dfe91f18 8056cf18 813a361c ecac8b10 8617e000 1f20: dfe91f3c dfe91f30 81a388b8 81a38788 dfe91f54 dfe91f40 8025e490 8028ef8c 1f40: dfe91fb0 40000000 dfe91f84 dfe91f58 802229ec 8025e44c 00000000 8281cddc 1f60: dfe91fb0 0014c820 ecac8b10 80222940 00000000 097bc3fa dfe91fac 00000000 1f80: 00000000 002f6308 00000036 8020029c 8617e000 00000036 00000000 dfe91fa8 1fa0: 80200060 8056cdf4 00000000 00000000 00000005 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fd80bc 1fe0: 76fd7ec0 76fd7eb0 0001948c 001322c0 60000010 00000005 00000000 00000000 Call trace: [<813b7eb0>] (subdev_8255_io) from [<813b7be8>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:841dd900 r4:813b7eb0 [<813b7b90>] (subdev_8255_do_config) from [<813b7fa8>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813b7b90>] (subdev_8255_do_config) from [<813b7fa8>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85ab8000 [<813b7f1c>] (subdev_8255_io_init) from [<813b819c>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813b7f1c>] (subdev_8255_io_init) from [<813b819c>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:dfe91da4 r5:841dd900 r4:85ab8000 [<813b80e0>] (dev_8255_attach) from [<813a70a0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r10:82b16f00 r9:00000000 r8:841dd900 r7:dfe91d90 r6:841dd944 r5:841dd900 r4:829d0084 [<813a6f98>] (comedi_device_attach) from [<813a2c20>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:8617e000 r7:200000c0 r6:b5403587 r5:841dd900 r4:200000c0 [<813a2b20>] (do_devconfig_ioctl) from [<813a3bec>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:8617e000 r7:200000c0 r6:200000c0 r5:841dd900 r4:84c75d80 [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:8617e000 r9:00000005 r8:84c75d80 r7:200000c0 r6:84c75d81 r5:00000000 r4:40946400 [<8056cde8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfe91fa8 to 0xdfe91ff0) 1fa0: 00000000 00000000 00000005 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fd80bc 1fe0: 76fd7ec0 76fd7eb0 0001948c 001322c0 r10:00000036 r9:8617e000 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