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: 11388 Comm: syz.2.2123 Not tainted 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 : [<8143e130>] lr : [<8143e11c>] psr: 60000013 sp : e0231cb8 ip : e0231cb8 fp : e0231cd4 r10: 00000000 r9 : 00000084 r8 : e0231da4 r7 : 00004f27 r6 : 0000009b r5 : 8301a900 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8301a900 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84ec4600 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8301a900 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 8301a900 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: 2-page vmalloc region starting at 0xe0230000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xe0230000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xe0230000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.2.2123 (pid: 11388, stack limit = 0xe0230000) Stack: (0xe0231cb8 to 0xe0232000) 1ca0: 8143e0d0 00004f27 1cc0: 8301a900 00004f27 e0231cf4 e0231cd8 8143de0c 8143e0dc 00004f27 e0231cf8 1ce0: 8143e1c4 85124000 e0231d14 e0231cf8 8143e1c4 8143ddc0 8301a900 00000000 1d00: 85124000 00004f27 e0231d54 e0231d18 8143e374 8143e148 82b05344 846cd680 1d20: 828217c0 00000000 00000000 829d6e04 8301a900 00000000 e0231d90 8301a900 1d40: 00000000 82b2efdc e0231d8c e0231d58 8142ccb8 8143e30c 40946400 00000000 1d60: e0231d7c 200000c0 8301a900 b5403587 40946400 00000003 00000003 8408a400 1d80: e0231e4c e0231d90 814284c4 8142cbb8 35353238 00000000 00000000 00000000 1da0: 00000000 00004f27 00000008 00000002 00000009 00000001 20000cc7 00000001 1dc0: 5c952399 00000004 000003ff 00000802 00001600 00000008 00000001 00000009 1de0: 0000e1cb 00000006 00000004 00000003 00000395 80000089 00000004 00000000 1e00: fffffff5 ffffeadb 00000005 0000003c 00000008 00000004 08000000 dffffffa 1e20: 00000000 32f22123 00000000 8617de40 8301a900 200000c0 40946400 00000003 1e40: e0231f14 e0231e50 814297e8 814283fc 00000000 32f22123 00000000 00000000 1e60: 824b857c e0231ea4 0000005f 847b0c28 00000064 8301a930 e0231ee4 e0231e88 1e80: 807cd874 807c3c4c 00000064 00000001 00000000 e0231ea4 860e1250 834f1330 1ea0: 00006400 0000000b e0231e98 00000000 00000000 32f22123 00000000 8617de40 1ec0: 40946400 200000c0 200000c0 8617de40 00000003 8408a400 e0231ef4 e0231ee8 1ee0: 807cd9a4 32f22123 e0231f14 00000000 8617de41 40946400 200000c0 8617de40 1f00: 00000003 8408a400 e0231fa4 e0231f18 8058f904 814294a0 ecac8b10 8408a400 1f20: e0231f3c e0231f30 81ae1554 81ae1420 e0231f54 e0231f40 8025a85c 8028c358 1f40: e0231fb0 40000000 e0231f84 e0231f58 80220bf8 8025a818 00000000 8281d2bc 1f60: e0231fb0 0013e290 ecac8b10 80220b4c 00000000 32f22123 e0231fac 00000000 1f80: 00000000 00346310 00000036 8020029c 8408a400 00000036 00000000 e0231fa8 1fa0: 80200060 8058f6cc 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fb50dc 1fe0: 76fb4e88 76fb4e78 00018ba0 001300f0 60000010 00000003 00000000 00000000 Call trace: [<8143e0d0>] (subdev_8255_io) from [<8143de0c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:8301a900 r5:00004f27 r4:8143e0d0 [<8143ddb4>] (subdev_8255_do_config) from [<8143e1c4>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8143ddb4>] (subdev_8255_do_config) from [<8143e1c4>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85124000 [<8143e13c>] (subdev_8255_io_init) from [<8143e374>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8143e13c>] (subdev_8255_io_init) from [<8143e374>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:85124000 r5:00000000 r4:8301a900 [<8143e300>] (dev_8255_attach) from [<8142ccb8>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2efdc r9:00000000 r8:8301a900 r7:e0231d90 r6:00000000 r5:8301a900 r4:829d6e04 [<8142cbac>] (comedi_device_attach) from [<814284c4>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:8408a400 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301a900 r4:200000c0 [<814283f0>] (do_devconfig_ioctl) from [<814297e8>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:8301a900 r4:8617de40 [<81429494>] (comedi_unlocked_ioctl) from [<8058f904>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81429494>] (comedi_unlocked_ioctl) from [<8058f904>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81429494>] (comedi_unlocked_ioctl) from [<8058f904>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81429494>] (comedi_unlocked_ioctl) from [<8058f904>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8408a400 r9:00000003 r8:8617de40 r7:200000c0 r6:40946400 r5:8617de41 r4:00000000 [<8058f6c0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0231fa8 to 0xe0231ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fb50dc 1fe0: 76fb4e88 76fb4e78 00018ba0 001300f0 r10:00000036 r9:8408a400 r8:8020029c r7:00000036 r6:00346310 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