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: 18052 Comm: syz.1.3462 Not tainted 6.16.0-rc7-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 : [<8139f1c0>] lr : [<8139f1ac>] psr: 60000013 sp : df961cc0 ip : df961cc0 fp : df961cdc r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 830e70c0 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 830e70c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84d155c0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 830e70c0 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 830e70c0 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 0xdf960000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdf960000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.1.3462 (pid: 18052, stack limit = 0xdf960000) Stack: (0xdf961cc0 to 0xdf962000) 1cc0: 8139f160 830e70c0 00004f27 00004f27 df961cfc df961ce0 8139ee98 8139f16c 1ce0: 00004f27 80500f38 84fd2000 84fd2000 df961d1c df961d00 8139f258 8139ee4c 1d00: 84fd2000 830e70c0 df961dac 00004f27 df961d5c df961d20 8139f44c 8139f1d8 1d20: 20000013 8417f300 82822670 00000000 00000000 829c53b0 830e70c0 00000000 1d40: df961d98 830e70c0 00000000 82b14ef8 df961d94 df961d60 8138e35c 8139f39c 1d60: 200000c0 00000000 df961d84 200000c0 830e70c0 b5403587 200000c0 854d6c00 1d80: 40946400 00000003 df961e4c df961d98 81389f28 8138e264 35353238 00000000 1da0: 00000000 00000000 00000000 00004f27 00000005 00000003 00000004 00000001 1dc0: 0000000c 00000012 00000004 0000000d fffffffc 00000002 00000001 fffffffe 1de0: 00000001 00000002 00000101 00000004 00000009 00000003 0000352f 00000099 1e00: 0000caa7 00000080 20001e58 00000007 02000e67 0000003c 00000008 fffffffe 1e20: 00000000 fffffff8 00000000 f42c38c2 00000000 85dcb9c0 830e70c0 200000c0 1e40: df961f14 df961e50 8138aedc 81389e5c 00000000 00000000 00000000 f42c38c2 1e60: 00000000 00000000 824693fc 0000005f 83b54e58 830e70f0 838a9e1c 854d6c00 1e80: df961ee4 df961e90 8078f7e4 80785ad4 00000064 00000001 00000000 df961eac 1ea0: 848fdc10 834d0198 00006400 0000000b df961ea0 00000000 00000000 f42c38c2 1ec0: 85dcb9c0 40946400 200000c0 200000c0 00000003 85dcb9c0 df961ef4 df961ee8 1ee0: 8078f904 f42c38c2 df961f14 40946400 00000000 85dcb9c1 200000c0 00000003 1f00: 85dcb9c0 854d6c00 df961fa4 df961f18 805679ec 8138a90c ecac8b10 854d6c00 1f20: df961f3c df961f30 81a24aec 81a249bc df961f54 df961f40 80261ffc 802935b0 1f40: df961fb0 40000000 df961f84 df961f58 802229ec 80261fb8 00000000 8281d09c 1f60: df961fb0 0014c520 ecac8b10 80222940 00000000 f42c38c2 df961fac 00000000 1f80: 00000000 002f6300 00000036 8020029c 854d6c00 00000036 00000000 df961fa8 1fa0: 80200060 805678c8 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bb30bc 1fe0: 76bb2ec0 76bb2eb0 000193a4 00131fc0 60000010 00000003 00000000 00000000 Call trace: [<8139f160>] (subdev_8255_io) from [<8139ee98>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:830e70c0 r4:8139f160 [<8139ee40>] (subdev_8255_do_config) from [<8139f258>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8139ee40>] (subdev_8255_do_config) from [<8139f258>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:84fd2000 [<8139f1cc>] (subdev_8255_io_init) from [<8139f44c>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<8139f1cc>] (subdev_8255_io_init) from [<8139f44c>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:df961dac r5:830e70c0 r4:84fd2000 [<8139f390>] (dev_8255_attach) from [<8138e35c>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:999) r10:82b14ef8 r9:00000000 r8:830e70c0 r7:df961d98 r6:00000000 r5:830e70c0 r4:829c53b0 [<8138e258>] (comedi_device_attach) from [<81389f28>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:854d6c00 r7:200000c0 r6:b5403587 r5:830e70c0 r4:200000c0 [<81389e50>] (do_devconfig_ioctl) from [<8138aedc>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2156) r6:200000c0 r5:830e70c0 r4:85dcb9c0 [<8138a900>] (comedi_unlocked_ioctl) from [<805679ec>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8138a900>] (comedi_unlocked_ioctl) from [<805679ec>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<8138a900>] (comedi_unlocked_ioctl) from [<805679ec>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<8138a900>] (comedi_unlocked_ioctl) from [<805679ec>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:854d6c00 r9:85dcb9c0 r8:00000003 r7:200000c0 r6:85dcb9c1 r5:00000000 r4:40946400 [<805678bc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf961fa8 to 0xdf961ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bb30bc 1fe0: 76bb2ec0 76bb2eb0 000193a4 00131fc0 r10:00000036 r9:854d6c00 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