8<--- cut here --- Unable to handle kernel paging request at virtual address fee000f0 when write [fee000f0] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 3872 Comm: syz.1.14 Not tainted 6.16.0-rc4-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 : [<813a5ab0>] lr : [<813a5a9c>] psr: 60000013 sp : dff89cc0 ip : dff89cc0 fp : dff89cdc r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 000000ed r6 : 0000009b r5 : 841a6540 r4 : 000000f0 r3 : 0000009b r2 : fee000f0 r1 : 00000001 r0 : 841a6540 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85a0a480 DAC: 00000000 Register r0 information: slab kmalloc-192 start 841a6540 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 841a6540 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 0xdff88000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdff88000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.1.14 (pid: 3872, stack limit = 0xdff88000) Stack: (0xdff89cc0 to 0xdff8a000) 9cc0: 813a5a50 841a6540 000000ed 000000ed dff89cfc dff89ce0 813a5788 813a5a5c 9ce0: 000000ed 80508714 8599a000 8599a000 dff89d1c dff89d00 813a5b48 813a573c 9d00: 8599a000 841a6540 dff89dac 000000ed dff89d5c dff89d20 813a5d3c 813a5ac8 9d20: 20000140 841a6540 b5403587 00000000 841a6540 829c52b0 841a6540 00000000 9d40: dff89d98 841a6540 00000000 82b15078 dff89d94 dff89d60 81394c60 813a5c8c 9d60: 20000140 00000000 dff89d84 20000140 841a6540 b5403587 20000140 832e2400 9d80: 40946400 00000003 dff89e4c dff89d98 813908f0 81394b68 35353238 00000000 9da0: 00000000 00000000 00000000 000000ed 00002168 00000002 0000000c 000088d2 9dc0: 0000008f fffffffd 00000010 00000002 ffffffff 00000200 00000008 00000344 9de0: 00000004 00000007 00000001 40000009 00000003 00000003 00000000 00000100 9e00: 00000003 00000080 00000000 00000001 00000001 0000b0c4 0000001c 00000008 9e20: 00000007 fffffffe 00000000 e999591b 00000000 85a13300 841a6540 20000140 9e40: dff89f14 dff89e50 813918a4 81390824 00000000 00000000 00000000 e999591b 9e60: 80295b04 00000000 8246a3fc 0000005f 83b52a58 841a6570 83bda63c 832e2400 9e80: dff89ee4 dff89e90 8079688c 8078cb7c 00000064 00000001 00000000 dff89eac 9ea0: 85a22d90 834d5880 00006400 0000000b dff89ea0 00000000 00000000 e999591b 9ec0: 85a13300 40946400 20000140 20000140 00000003 85a13300 dff89ef4 dff89ee8 9ee0: 807969ac e999591b dff89f14 40946400 00000000 85a13301 20000140 00000003 9f00: 85a13300 832e2400 dff89fa4 dff89f18 8056f16c 813912d4 ecac8b10 832e2400 9f20: dff89f3c dff89f30 81a2db68 81a2da38 dff89f54 dff89f40 8026203c 802935d8 9f40: dff89fb0 40000000 dff89f84 dff89f58 802229ec 80261ff8 00000000 8281d09c 9f60: dff89fb0 0014c4a0 ecac8b10 80222940 00000000 e999591b dff89fac 00000000 9f80: 00000000 002f6300 00000036 8020029c 832e2400 00000036 00000000 dff89fa8 9fa0: 80200060 8056f048 00000000 00000000 00000003 40946400 20000140 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b5e0bc 9fe0: 76b5dec0 76b5deb0 000193a4 00131f40 60000010 00000003 00000000 00000000 Call trace: [<813a5a50>] (subdev_8255_io) from [<813a5788>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:000000ed r6:000000ed r5:841a6540 r4:813a5a50 [<813a5730>] (subdev_8255_do_config) from [<813a5b48>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813a5730>] (subdev_8255_do_config) from [<813a5b48>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:8599a000 [<813a5abc>] (subdev_8255_io_init) from [<813a5d3c>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813a5abc>] (subdev_8255_io_init) from [<813a5d3c>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:000000ed r6:dff89dac r5:841a6540 r4:8599a000 [<813a5c80>] (dev_8255_attach) from [<81394c60>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r10:82b15078 r9:00000000 r8:841a6540 r7:dff89d98 r6:00000000 r5:841a6540 r4:829c52b0 [<81394b5c>] (comedi_device_attach) from [<813908f0>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:832e2400 r7:20000140 r6:b5403587 r5:841a6540 r4:20000140 [<81390818>] (do_devconfig_ioctl) from [<813918a4>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:20000140 r5:841a6540 r4:85a13300 [<813912c8>] (comedi_unlocked_ioctl) from [<8056f16c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813912c8>] (comedi_unlocked_ioctl) from [<8056f16c>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<813912c8>] (comedi_unlocked_ioctl) from [<8056f16c>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<813912c8>] (comedi_unlocked_ioctl) from [<8056f16c>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:832e2400 r9:85a13300 r8:00000003 r7:20000140 r6:85a13301 r5:00000000 r4:40946400 [<8056f03c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdff89fa8 to 0xdff89ff0) 9fa0: 00000000 00000000 00000003 40946400 20000140 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b5e0bc 9fe0: 76b5dec0 76b5deb0 000193a4 00131f40 r10:00000036 r9:832e2400 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