8<--- cut here --- Unable to handle kernel paging request at virtual address fee0010c when write [fee0010c] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 5253 Comm: syz.0.461 Not tainted 6.16.0-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 : [<813a4ab8>] lr : [<813a4aa4>] psr: 60000013 sp : dfad5cb8 ip : dfad5cb8 fp : dfad5cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00000109 r6 : 0000009b r5 : 8408f180 r4 : 0000010c r3 : 0000009b r2 : fee0010c r1 : 00000001 r0 : 8408f180 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85eef200 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8408f180 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 8408f180 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 0xdfad4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2602 Register r12 information: 2-page vmalloc region starting at 0xdfad4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2602 Process syz.0.461 (pid: 5253, stack limit = 0xdfad4000) Stack: (0xdfad5cb8 to 0xdfad6000) 5ca0: 813a4a58 8408f180 5cc0: 00000109 00000109 dfad5cf4 dfad5cd8 813a4790 813a4a64 00000109 804ff1e0 5ce0: 85c9ec00 85c9ec00 dfad5d14 dfad5cf8 813a4b50 813a4744 85c9ec00 8408f180 5d00: dfad5da4 00000109 dfad5d54 dfad5d18 813a4d44 813a4ad0 82ad8e60 83b8d880 5d20: 82821870 00000000 00000000 829c4e70 8408f180 8408f1c4 dfad5d90 8408f180 5d40: 00000000 82b13fb8 dfad5d8c dfad5d58 81393c4c 813a4c94 20000540 00000000 5d60: dfad5d7c 20000540 8408f180 b5403587 20000540 83af8000 40946400 00000000 5d80: dfad5e4c dfad5d90 8138f7cc 81393b50 35353238 00000000 00000000 00000000 5da0: 00000000 00000109 80008000 0000086b 0000000a 00000000 00000000 00000001 5dc0: 0008000f 00001004 00000001 00000008 00000005 00000006 00000001 1138fce9 5de0: 00000006 ffffffa7 02000001 fffffffd 00000658 000003ff 00010004 00000800 5e00: 0000e2df 00000009 00000006 00000004 00000003 00000007 00000005 00000005 5e20: 00000000 5e8c7cad 00000000 85f35840 8408f180 20000540 20000540 83af8000 5e40: dfad5f14 dfad5e50 81390798 8138f6d8 00000000 00000000 00000000 5e8c7cad 5e60: 00000000 00000000 8245753c 0000005f 83cd9058 8408f1b0 840c2294 83af8000 5e80: dfad5ee4 dfad5e90 8078e82c 80784b90 00000064 00000001 00000000 dfad5eac 5ea0: 85be6f10 83434000 00006400 0000000b dfad5ea0 00000000 00000000 5e8c7cad 5ec0: 85f35840 40946400 20000540 20000540 85f35840 00000003 dfad5ef4 dfad5ee8 5ee0: 8078e94c 5e8c7cad dfad5f14 40946400 00000000 85f35841 20000540 85f35840 5f00: 00000003 83af8000 dfad5fa4 dfad5f18 80565734 813901c8 ecac8b10 83af8000 5f20: dfad5f3c dfad5f30 81a187f0 81a186c0 dfad5f54 dfad5f40 8025e40c 8028f760 5f40: dfad5fb0 40000000 dfad5f84 dfad5f58 802229ec 8025e3c8 00000000 8281d09c 5f60: dfad5fb0 0014c520 ecac8b10 80222940 00000000 5e8c7cad dfad5fac 00000000 5f80: 00000000 002f6300 00000036 8020029c 83af8000 00000036 00000000 dfad5fa8 5fa0: 80200060 80565610 00000000 00000000 00000003 40946400 20000540 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bfd0bc 5fe0: 76bfcec0 76bfceb0 000193a4 00131fc0 60000010 00000003 00000000 00000000 Call trace: [<813a4a58>] (subdev_8255_io) from [<813a4790>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000109 r6:00000109 r5:8408f180 r4:813a4a58 [<813a4738>] (subdev_8255_do_config) from [<813a4b50>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813a4738>] (subdev_8255_do_config) from [<813a4b50>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85c9ec00 [<813a4ac4>] (subdev_8255_io_init) from [<813a4d44>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813a4ac4>] (subdev_8255_io_init) from [<813a4d44>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00000109 r6:dfad5da4 r5:8408f180 r4:85c9ec00 [<813a4c88>] (dev_8255_attach) from [<81393c4c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r10:82b13fb8 r9:00000000 r8:8408f180 r7:dfad5d90 r6:8408f1c4 r5:8408f180 r4:829c4e70 [<81393b44>] (comedi_device_attach) from [<8138f7cc>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000000 r9:40946400 r8:83af8000 r7:20000540 r6:b5403587 r5:8408f180 r4:20000540 [<8138f6cc>] (do_devconfig_ioctl) from [<81390798>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:83af8000 r7:20000540 r6:20000540 r5:8408f180 r4:85f35840 [<813901bc>] (comedi_unlocked_ioctl) from [<80565734>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813901bc>] (comedi_unlocked_ioctl) from [<80565734>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813901bc>] (comedi_unlocked_ioctl) from [<80565734>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813901bc>] (comedi_unlocked_ioctl) from [<80565734>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:83af8000 r9:00000003 r8:85f35840 r7:20000540 r6:85f35841 r5:00000000 r4:40946400 [<80565604>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfad5fa8 to 0xdfad5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000540 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bfd0bc 5fe0: 76bfcec0 76bfceb0 000193a4 00131fc0 r10:00000036 r9:83af8000 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