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: 25941 Comm: syz.3.4888 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 : [<8143e108>] lr : [<8143e0f4>] psr: 60000013 sp : dfd61cb8 ip : dfd61cb8 fp : dfd61cd4 r10: 00000000 r9 : 00000084 r8 : dfd61da4 r7 : 00004f27 r6 : 0000009b r5 : 84630180 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 84630180 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 860b6480 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84630180 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 84630180 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 0xdfd60000 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 0xdfd60000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xdfd60000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.3.4888 (pid: 25941, stack limit = 0xdfd60000) Stack: (0xdfd61cb8 to 0xdfd62000) 1ca0: 8143e0a8 00004f27 1cc0: 84630180 00004f27 dfd61cf4 dfd61cd8 8143dde4 8143e0b4 00004f27 80522730 1ce0: 8473e000 8473e000 dfd61d14 dfd61cf8 8143e19c 8143dd98 84630180 00000000 1d00: 8473e000 00004f27 dfd61d54 dfd61d18 8143e34c 8143e120 82b0ce04 84c95000 1d20: 828217c0 00000000 00000000 829d6e04 84630180 00000000 dfd61d90 84630180 1d40: 00000000 82b2efdc dfd61d8c dfd61d58 8142cc90 8143e2e4 40946400 00000000 1d60: dfd61d7c 200000c0 84630180 b5403587 40946400 00000003 00000003 845fd400 1d80: dfd61e4c dfd61d90 8142849c 8142cb90 35353238 00000000 00000000 00000000 1da0: 00000000 00004f27 00000005 00000022 00000401 00000001 00006dc4 00000fff 1dc0: 5c95239c 00000005 000003ff 00000806 00000401 00000001 00000002 00000009 1de0: 0000e1cb 00000005 00000004 00000003 00000000 8000008b fffffffe 0000000a 1e00: fffffff5 00000001 00000003 00000000 00000000 00000004 08000000 dffffff9 1e20: 00000000 b0930558 00000000 86c82540 84630180 200000c0 40946400 00000003 1e40: dfd61f14 dfd61e50 814297c0 814283d4 00000000 b0930558 00000000 00000000 1e60: 824b857c dfd61ea4 0000005f 841c6058 00000064 846301b0 dfd61ee4 dfd61e88 1e80: 807cd86c 807c3c44 00000064 00000001 00000000 dfd61ea4 8606c850 834e2d48 1ea0: 00006400 0000000b dfd61e98 00000000 00000000 b0930558 00000000 86c82540 1ec0: 40946400 200000c0 200000c0 86c82540 00000003 845fd400 dfd61ef4 dfd61ee8 1ee0: 807cd99c b0930558 dfd61f14 00000000 86c82541 40946400 200000c0 86c82540 1f00: 00000003 845fd400 dfd61fa4 dfd61f18 8058f8fc 81429478 ecac8b10 845fd400 1f20: dfd61f3c dfd61f30 81ae1534 81ae1400 dfd61f54 dfd61f40 8025a85c 8028c358 1f40: dfd61fb0 40000000 dfd61f84 dfd61f58 80220bf8 8025a818 00000000 8281d2bc 1f60: dfd61fb0 0013e290 ecac8b10 80220b4c 00000000 b0930558 dfd61fac 00000000 1f80: 00000000 00346310 00000036 8020029c 845fd400 00000036 00000000 dfd61fa8 1fa0: 80200060 8058f6c4 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fa40dc 1fe0: 76fa3e88 76fa3e78 00018ba0 001300f0 60000010 00000003 00000000 00000000 Call trace: [<8143e0a8>] (subdev_8255_io) from [<8143dde4>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:84630180 r5:00004f27 r4:8143e0a8 [<8143dd8c>] (subdev_8255_do_config) from [<8143e19c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8143dd8c>] (subdev_8255_do_config) from [<8143e19c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8473e000 [<8143e114>] (subdev_8255_io_init) from [<8143e34c>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8143e114>] (subdev_8255_io_init) from [<8143e34c>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:8473e000 r5:00000000 r4:84630180 [<8143e2d8>] (dev_8255_attach) from [<8142cc90>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2efdc r9:00000000 r8:84630180 r7:dfd61d90 r6:00000000 r5:84630180 r4:829d6e04 [<8142cb84>] (comedi_device_attach) from [<8142849c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:845fd400 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:84630180 r4:200000c0 [<814283c8>] (do_devconfig_ioctl) from [<814297c0>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:84630180 r4:86c82540 [<8142946c>] (comedi_unlocked_ioctl) from [<8058f8fc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142946c>] (comedi_unlocked_ioctl) from [<8058f8fc>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142946c>] (comedi_unlocked_ioctl) from [<8058f8fc>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142946c>] (comedi_unlocked_ioctl) from [<8058f8fc>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:845fd400 r9:00000003 r8:86c82540 r7:200000c0 r6:40946400 r5:86c82541 r4:00000000 [<8058f6b8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfd61fa8 to 0xdfd61ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fa40dc 1fe0: 76fa3e88 76fa3e78 00018ba0 001300f0 r10:00000036 r9:845fd400 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