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: 15360 Comm: syz.8.2931 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 : [<81415a14>] lr : [<81415a00>] psr: 60000013 sp : e04c9cb0 ip : e04c9cb0 fp : e04c9ccc r10: 00000001 r9 : 00000084 r8 : e04c9d9c r7 : 00004f27 r6 : 0000009b r5 : 8385f840 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8385f840 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86399b80 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8385f840 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 8385f840 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 0xe04c8000 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 0xe04c8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xe04c8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.8.2931 (pid: 15360, stack limit = 0xe04c8000) Stack: (0xe04c9cb0 to 0xe04ca000) 9ca0: 814159b4 8385f840 00004f27 00004f27 9cc0: e04c9cec e04c9cd0 814156ec 814159c0 00004f27 80514fb4 839db000 839db000 9ce0: e04c9d0c e04c9cf0 81415aac 814156a0 8385f840 00000000 839db000 00004f27 9d00: e04c9d4c e04c9d10 81415c58 81415a2c 8280cc60 866adf80 828217b0 00000000 9d20: 00000000 829d46a0 8385f840 8385f884 e04c9d88 8385f840 00000000 82b28ad8 9d40: e04c9d84 e04c9d50 81404788 81415bf0 8385f870 00000000 e04c9d74 200000c0 9d60: 8385f840 b5403587 8385f870 8536e000 40946400 00000003 e04c9e44 e04c9d88 9d80: 814000e0 8140468c 35353238 00000000 00000000 00000000 00000000 00004f27 9da0: 00008000 00000001 00000010 0000ffff 00040cc7 00000008 00000007 0000000a 9dc0: 00000004 00000002 00000001 00000009 0000ca00 000009aa 00000101 00000001 9de0: 0001a449 00000003 40000003 00000089 00000002 00000f27 00009ee7 0000000b 9e00: 00000e69 0000003c 00000008 00010001 00000000 00000aab 00000000 86dc018d 9e20: 00000000 84d5d840 8385f840 200000c0 8385f870 8536e000 e04c9f14 e04c9e48 9e40: 814010d4 813fffec 00000000 00000000 00000000 00000000 00000000 86dc018d 9e60: 00000000 00000000 824a35ec 0000005f 842da640 00000064 845b199c 8536e000 9e80: e04c9ee4 e04c9e90 807b7ea8 807ae3cc 00000064 00000001 00000000 e04c9eac 9ea0: 85b7c250 835b4660 00006400 0000000b e04c9ea0 00000000 00000000 86dc018d 9ec0: 84d5d840 40946400 200000c0 200000c0 84d5d840 00000003 e04c9ef4 e04c9ee8 9ee0: 807b7fc8 86dc018d e04c9f14 40946400 00000000 84d5d841 200000c0 84d5d840 9f00: 00000003 8536e000 e04c9fa4 e04c9f18 805855f0 81400b24 ecac8b10 8536e000 9f20: e04c9f3c e04c9f30 81aaf74c 81aaf61c e04c9f54 e04c9f40 8025bcbc 8028e0c4 9f40: e04c9fb0 40000000 e04c9f84 e04c9f58 80221a38 8025bc78 00000000 8281d17c 9f60: e04c9fb0 0014c880 ecac8b10 8022198c 00000000 86dc018d e04c9fac 00000000 9f80: 00000000 00316310 00000036 8020029c 8536e000 00000036 00000000 e04c9fa8 9fa0: 80200060 805854cc 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f5d0bc 9fe0: 76f5cec0 76f5ceb0 0001929c 00132320 60000010 00000003 00000000 00000000 Call trace: [<814159b4>] (subdev_8255_io) from [<814156ec>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:8385f840 r4:814159b4 [<81415694>] (subdev_8255_do_config) from [<81415aac>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81415694>] (subdev_8255_do_config) from [<81415aac>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:839db000 [<81415a20>] (subdev_8255_io_init) from [<81415c58>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<81415a20>] (subdev_8255_io_init) from [<81415c58>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:839db000 r5:00000000 r4:8385f840 [<81415be4>] (dev_8255_attach) from [<81404788>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:8385f840 r7:e04c9d88 r6:8385f884 r5:8385f840 r4:829d46a0 [<81404680>] (comedi_device_attach) from [<814000e0>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:8536e000 r7:8385f870 r6:b5403587 r5:8385f840 r4:200000c0 [<813fffe0>] (do_devconfig_ioctl) from [<814010d4>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:8536e000 r7:8385f870 r6:200000c0 r5:8385f840 r4:84d5d840 [<81400b18>] (comedi_unlocked_ioctl) from [<805855f0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400b18>] (comedi_unlocked_ioctl) from [<805855f0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400b18>] (comedi_unlocked_ioctl) from [<805855f0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400b18>] (comedi_unlocked_ioctl) from [<805855f0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:8536e000 r9:00000003 r8:84d5d840 r7:200000c0 r6:84d5d841 r5:00000000 r4:40946400 [<805854c0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe04c9fa8 to 0xe04c9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f5d0bc 9fe0: 76f5cec0 76f5ceb0 0001929c 00132320 r10:00000036 r9:8536e000 r8:8020029c r7:00000036 r6:00316310 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