8<--- cut here --- Unable to handle kernel paging request at virtual address fee04faa when write [fee04faa] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 5939 Comm: syz.1.550 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 : [<81415c6c>] lr : [<81415c58>] psr: 60000013 sp : eaae9cb0 ip : eaae9cb0 fp : eaae9ccc r10: 00000001 r9 : 00000084 r8 : eaae9d9c r7 : 00004fa7 r6 : 0000009b r5 : 846980c0 r4 : 00004faa r3 : 0000009b r2 : fee04faa r1 : 00000001 r0 : 846980c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 866492c0 DAC: 00000000 Register r0 information: slab kmalloc-192 start 846980c0 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 846980c0 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 0xeaae8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xeaae8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xeaae8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.1.550 (pid: 5939, stack limit = 0xeaae8000) Stack: (0xeaae9cb0 to 0xeaaea000) 9ca0: 81415c0c 846980c0 00004fa7 00004fa7 9cc0: eaae9cec eaae9cd0 81415944 81415c18 00004fa7 80514fcc 85b32000 85b32000 9ce0: eaae9d0c eaae9cf0 81415d04 814158f8 846980c0 00000000 85b32000 00004fa7 9d00: eaae9d4c eaae9d10 81415eb0 81415c84 8280cc60 85cd4600 828217b0 00000000 9d20: 00000000 829d46a0 846980c0 84698104 eaae9d88 846980c0 00000000 82b28ad8 9d40: eaae9d84 eaae9d50 814049e0 81415e48 846980f0 00000000 eaae9d74 200000c0 9d60: 846980c0 b5403587 846980f0 85e20000 40946400 00000003 eaae9e44 eaae9d88 9d80: 81400338 814048e4 35353238 00000000 00000000 00000000 00000000 00004fa7 9da0: 00000006 00000002 10000421 00000003 00000cc7 7ffffffb 80000000 00000003 9dc0: 000003ff 00000001 00000300 00000001 00000101 00100009 00000004 000403fd 9de0: 00000008 000048f3 000001ff 00000574 fffffff8 00400000 00000009 ffffeadb 9e00: 00000000 00000000 00000008 00000004 07feffff 000000c7 00000000 3f2de7c0 9e20: 00000000 8517e480 846980c0 200000c0 846980f0 85e20000 eaae9f14 eaae9e48 9e40: 8140132c 81400244 00000000 00000000 00000000 00000000 00000000 3f2de7c0 9e60: 00000000 00000000 824a35ec 0000005f 845f4838 00000064 842cdcfc 85e20000 9e80: eaae9ee4 eaae9e90 807b7f80 807ae4a4 00000064 00000001 00000000 eaae9eac 9ea0: 85257f10 83429198 00006400 0000000b eaae9ea0 00000000 00000000 3f2de7c0 9ec0: 8517e480 40946400 200000c0 200000c0 8517e480 00000003 eaae9ef4 eaae9ee8 9ee0: 807b80a0 3f2de7c0 eaae9f14 40946400 00000000 8517e481 200000c0 8517e480 9f00: 00000003 85e20000 eaae9fa4 eaae9f18 80585608 81400d7c ecac8b10 85e20000 9f20: eaae9f3c eaae9f30 81aaf9ac 81aaf87c eaae9f54 eaae9f40 8025bcbc 8028e0c4 9f40: eaae9fb0 40000000 eaae9f84 eaae9f58 80221a38 8025bc78 00000000 8281d17c 9f60: eaae9fb0 0014c8c0 ecac8b10 8022198c 00000000 3f2de7c0 eaae9fac 00000000 9f80: 00000000 00326310 00000036 8020029c 85e20000 00000036 00000000 eaae9fa8 9fa0: 80200060 805854e4 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f210bc 9fe0: 76f20ec0 76f20eb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<81415c0c>] (subdev_8255_io) from [<81415944>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004fa7 r6:00004fa7 r5:846980c0 r4:81415c0c [<814158ec>] (subdev_8255_do_config) from [<81415d04>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814158ec>] (subdev_8255_do_config) from [<81415d04>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85b32000 [<81415c78>] (subdev_8255_io_init) from [<81415eb0>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<81415c78>] (subdev_8255_io_init) from [<81415eb0>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004fa7 r6:85b32000 r5:00000000 r4:846980c0 [<81415e3c>] (dev_8255_attach) from [<814049e0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:846980c0 r7:eaae9d88 r6:84698104 r5:846980c0 r4:829d46a0 [<814048d8>] (comedi_device_attach) from [<81400338>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:85e20000 r7:846980f0 r6:b5403587 r5:846980c0 r4:200000c0 [<81400238>] (do_devconfig_ioctl) from [<8140132c>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:85e20000 r7:846980f0 r6:200000c0 r5:846980c0 r4:8517e480 [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85e20000 r9:00000003 r8:8517e480 r7:200000c0 r6:8517e481 r5:00000000 r4:40946400 [<805854d8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xeaae9fa8 to 0xeaae9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f210bc 9fe0: 76f20ec0 76f20eb0 000192bc 00132360 r10:00000036 r9:85e20000 r8:8020029c r7:00000036 r6:00326310 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