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: 3443 Comm: syz.5.25294 Not tainted 6.16.0-rc6-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 : [<8139ebe8>] lr : [<8139ebd4>] psr: 60000013 sp : e06c5cc0 ip : e06c5cc0 fp : e06c5cdc r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 841b5cc0 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 841b5cc0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 858e5080 DAC: fffffffd Register r0 information: slab kmalloc-192 start 841b5cc0 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 841b5cc0 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 0xe06c4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xe06c4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.5.25294 (pid: 3443, stack limit = 0xe06c4000) Stack: (0xe06c5cc0 to 0xe06c6000) 5cc0: 8139eb88 841b5cc0 00004f27 00004f27 e06c5cfc e06c5ce0 8139e8c0 8139eb94 5ce0: 00004f27 80500f30 84973c00 84973c00 e06c5d1c e06c5d00 8139ec80 8139e874 5d00: 84973c00 841b5cc0 e06c5dac 00004f27 e06c5d5c e06c5d20 8139ee74 8139ec00 5d20: 20000013 83941f00 82822670 00000000 00000000 829c5270 841b5cc0 00000000 5d40: e06c5d98 841b5cc0 00000000 82b14ef8 e06c5d94 e06c5d60 8138dd98 8139edc4 5d60: 200000c0 00000000 e06c5d84 200000c0 841b5cc0 b5403587 200000c0 84a64800 5d80: 40946400 00000003 e06c5e4c e06c5d98 81389a28 8138dca0 35353238 00000000 5da0: 00000000 00000000 00000000 00004f27 00000002 00010000 00000004 00000004 5dc0: 00000000 00000008 00000007 0000000a 00000000 00000002 00000001 00000001 5de0: 00000800 00000006 00000b4c 00000000 0001a449 00000003 40000003 00000089 5e00: 0000caa7 00000000 20001e58 0000000b 00000e69 0000003c 00000008 00000001 5e20: 00000000 fffffff8 00000000 d0fd50f6 00000000 85b06cc0 841b5cc0 200000c0 5e40: e06c5f14 e06c5e50 8138a9dc 8138995c 00000000 00000000 00000000 d0fd50f6 5e60: 00000000 00000000 824693fc 0000005f 83f49858 841b5cf0 84268174 84a64800 5e80: e06c5ee4 e06c5e90 8078f3ec 807856dc 00000064 00000001 00000000 e06c5eac 5ea0: 84884cd0 8343f880 00006400 0000000b e06c5ea0 00000000 00000000 d0fd50f6 5ec0: 85b06cc0 40946400 200000c0 200000c0 00000003 85b06cc0 e06c5ef4 e06c5ee8 5ee0: 8078f50c d0fd50f6 e06c5f14 40946400 00000000 85b06cc1 200000c0 00000003 5f00: 85b06cc0 84a64800 e06c5fa4 e06c5f18 805679d4 8138a40c ecac8b10 84a64800 5f20: e06c5f3c e06c5f30 81a245ec 81a244bc e06c5f54 e06c5f40 80261ffc 80293598 5f40: e06c5fb0 40000000 e06c5f84 e06c5f58 802229ec 80261fb8 00000000 8281d09c 5f60: e06c5fb0 0014c520 ecac8b10 80222940 00000000 d0fd50f6 e06c5fac 00000000 5f80: 00000000 002f6300 00000036 8020029c 84a64800 00000036 00000000 e06c5fa8 5fa0: 80200060 805678b0 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b420bc 5fe0: 76b41ec0 76b41eb0 000193a4 00131fc0 60000010 00000003 00000000 00000000 Call trace: [<8139eb88>] (subdev_8255_io) from [<8139e8c0>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:841b5cc0 r4:8139eb88 [<8139e868>] (subdev_8255_do_config) from [<8139ec80>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8139e868>] (subdev_8255_do_config) from [<8139ec80>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:84973c00 [<8139ebf4>] (subdev_8255_io_init) from [<8139ee74>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<8139ebf4>] (subdev_8255_io_init) from [<8139ee74>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:e06c5dac r5:841b5cc0 r4:84973c00 [<8139edb8>] (dev_8255_attach) from [<8138dd98>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r10:82b14ef8 r9:00000000 r8:841b5cc0 r7:e06c5d98 r6:00000000 r5:841b5cc0 r4:829c5270 [<8138dc94>] (comedi_device_attach) from [<81389a28>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:84a64800 r7:200000c0 r6:b5403587 r5:841b5cc0 r4:200000c0 [<81389950>] (do_devconfig_ioctl) from [<8138a9dc>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:200000c0 r5:841b5cc0 r4:85b06cc0 [<8138a400>] (comedi_unlocked_ioctl) from [<805679d4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8138a400>] (comedi_unlocked_ioctl) from [<805679d4>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<8138a400>] (comedi_unlocked_ioctl) from [<805679d4>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<8138a400>] (comedi_unlocked_ioctl) from [<805679d4>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:84a64800 r9:85b06cc0 r8:00000003 r7:200000c0 r6:85b06cc1 r5:00000000 r4:40946400 [<805678a4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe06c5fa8 to 0xe06c5ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b420bc 5fe0: 76b41ec0 76b41eb0 000193a4 00131fc0 r10:00000036 r9:84a64800 r8:8020029c r7:00000036 r6:002f6300 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