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: 15087 Comm: syz.5.2389 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : [<81436260>] lr : [<8143624c>] psr: 60000013 sp : e01c5cb8 ip : e01c5cb8 fp : e01c5cd4 r10: 00000000 r9 : 00000084 r8 : e01c5da4 r7 : 00004f27 r6 : 0000009b r5 : 845fb780 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 845fb780 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85c80900 DAC: fffffffd Register r0 information: slab kmalloc-192 start 845fb780 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 845fb780 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 0xe01c4000 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 0xe01c4000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xe01c4000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.5.2389 (pid: 15087, stack limit = 0xe01c4000) Stack: (0xe01c5cb8 to 0xe01c6000) 5ca0: 81436200 00004f27 5cc0: 845fb780 00004f27 e01c5cf4 e01c5cd8 81435f3c 8143620c 00004f27 805223ec 5ce0: 84759000 84759000 e01c5d14 e01c5cf8 814362f4 81435ef0 845fb780 00000000 5d00: 84759000 00004f27 e01c5d54 e01c5d18 814364a4 81436278 82b07dfc 83880a00 5d20: 82821780 00000000 00000000 829d6504 845fb780 00000000 e01c5d90 845fb780 5d40: 00000000 82b2df9c e01c5d8c e01c5d58 81424e90 8143643c 40946400 00000000 5d60: e01c5d7c 200004c0 845fb780 b5403587 40946400 84faa400 00000003 845fb7b0 5d80: e01c5e4c e01c5d90 814207c8 81424d90 35353238 00000000 00000000 00000000 5da0: 00000000 00004f27 00000005 00000002 00000401 00000001 00000081 00000fff 5dc0: 5c952399 00000005 000003ff 00000802 00001600 00000001 00000001 01734000 5de0: 00000dd4 00000006 00000000 00000003 00000395 80000089 00000004 00000000 5e00: fffffff6 fffeeadb 00000000 0000003c 00000006 00000004 08000001 dffffffa 5e20: 00000000 e3dd0273 00000000 838d0780 845fb780 200004c0 40946400 84faa400 5e40: e01c5f14 e01c5e50 81421348 81420700 00000000 e3dd0273 00000000 00000000 5e60: 824b557c e01c5ea4 0000005f 84470a30 00000064 84167f84 e01c5ee4 e01c5e88 5e80: 807cb7cc 807c1ba4 00000064 00000001 00000000 e01c5ea4 830d0010 8343c330 5ea0: 00006400 0000000b e01c5e98 00000000 00000000 e3dd0273 00000000 838d0780 5ec0: 40946400 200004c0 200004c0 838d0780 00000003 84faa400 e01c5ef4 e01c5ee8 5ee0: 807cb8fc e3dd0273 e01c5f14 00000000 838d0781 40946400 200004c0 838d0780 5f00: 00000003 84faa400 e01c5fa4 e01c5f18 8058f558 81421250 ecac8b10 84faa400 5f20: e01c5f3c e01c5f30 81ad9374 81ad9240 e01c5f54 e01c5f40 8025a85c 8028bff0 5f40: e01c5fb0 40000000 e01c5f84 e01c5f58 80220bf8 8025a818 00000000 8281d27c 5f60: e01c5fb0 0013ddc0 ecac8b10 80220b4c 00000000 e3dd0273 e01c5fac 00000000 5f80: 00000000 00346310 00000036 8020029c 84faa400 00000036 00000000 e01c5fa8 5fa0: 80200060 8058f320 00000000 00000000 00000003 40946400 200004c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fc90dc 5fe0: 76fc8e88 76fc8e78 00018734 0012fc20 60000010 00000003 00000000 00000000 Call trace: [<81436200>] (subdev_8255_io) from [<81435f3c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:845fb780 r5:00004f27 r4:81436200 [<81435ee4>] (subdev_8255_do_config) from [<814362f4>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81435ee4>] (subdev_8255_do_config) from [<814362f4>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:84759000 [<8143626c>] (subdev_8255_io_init) from [<814364a4>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8143626c>] (subdev_8255_io_init) from [<814364a4>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:84759000 r5:00000000 r4:845fb780 [<81436430>] (dev_8255_attach) from [<81424e90>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2df9c r9:00000000 r8:845fb780 r7:e01c5d90 r6:00000000 r5:845fb780 r4:829d6504 [<81424d84>] (comedi_device_attach) from [<814207c8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:845fb7b0 r9:00000003 r8:84faa400 r7:40946400 r6:b5403587 r5:845fb780 r4:200004c0 [<814206f4>] (do_devconfig_ioctl) from [<81421348>] (comedi_unlocked_ioctl+0x104/0x1c80 drivers/comedi/comedi_fops.c:2240) r8:84faa400 r7:40946400 r6:200004c0 r5:845fb780 r4:838d0780 [<81421244>] (comedi_unlocked_ioctl) from [<8058f558>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81421244>] (comedi_unlocked_ioctl) from [<8058f558>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81421244>] (comedi_unlocked_ioctl) from [<8058f558>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81421244>] (comedi_unlocked_ioctl) from [<8058f558>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84faa400 r9:00000003 r8:838d0780 r7:200004c0 r6:40946400 r5:838d0781 r4:00000000 [<8058f314>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe01c5fa8 to 0xe01c5ff0) 5fa0: 00000000 00000000 00000003 40946400 200004c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fc90dc 5fe0: 76fc8e88 76fc8e78 00018734 0012fc20 r10:00000036 r9:84faa400 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