8<--- cut here --- Unable to handle kernel paging request at virtual address fee00143 when write [fee00143] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 10845 Comm: syz.5.1523 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:99 [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 : [<814a1438>] lr : [<814a1424>] psr: 60000013 sp : e03b9cb8 ip : e03b9cb8 fp : e03b9cd4 r10: 00000140 r9 : 00000004 r8 : e03b9da4 r7 : 00000000 r6 : 0000009b r5 : 8422e240 r4 : 00000143 r3 : 0000009b r2 : fee00143 r1 : 00000001 r0 : 8422e240 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8ab873c0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8422e240 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:1048 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 8422e240 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: 2-page vmalloc region starting at 0xe03b8000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xe03b8000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xe03b8000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.5.1523 (pid: 10845, stack limit = 0xe03b8000) Stack: (0xe03b9cb8 to 0xe03ba000) 9ca0: 814a13d8 00000140 9cc0: 8422e240 00000000 e03b9cf4 e03b9cd8 814a1114 814a13e4 00000140 e03b9cf8 9ce0: 80546424 86c1f000 e03b9d14 e03b9cf8 814a14cc 814a10c8 8422e240 00000000 9d00: 86c1f000 00000000 e03b9d54 e03b9d18 814a167c 814a1450 ffffffff 00000004 9d20: 00000000 00000000 8422e240 82bd965c 8422e240 00000000 e03b9d90 8422e240 9d40: 00000000 82d30dfc e03b9d8c e03b9d58 81490020 814a1614 b5403587 00000000 9d60: 00000002 200003c0 8422e240 b5403587 40946400 00000002 00000005 840c6200 9d80: e03b9e4c e03b9d90 8148b824 8148ff24 35353238 00000000 00000000 00000000 9da0: 00000000 00000140 fffffffc 0000000d 00000006 00000206 00000004 00010005 9dc0: 40000006 00004007 00000010 00000005 00000005 00000003 0000000d 00000087 9de0: 00009e9b 00000101 00000008 00000006 00000009 ffffffff 00000461 0000000a 9e00: 00000009 00000ffd 00000008 00000008 00000003 00000283 00008001 00000005 9e20: 00000000 2e04ab0c 840c6200 8689c080 8422e240 200003c0 40946400 00000002 9e40: e03b9f14 e03b9e50 8148cb4c 8148b764 00000000 2e04ab0c 00000000 00000000 9e60: 82549844 e03b9ea4 0000005f 8415f0f0 00000064 8422e270 e03b9ee4 e03b9e88 9e80: 80806254 807fc90c 00000064 00000001 00000000 e03b9ea4 862a9210 834ddd48 9ea0: 00006400 0000000b e03b9e98 00000000 00000000 2e04ab0c 00000000 8689c080 9ec0: 40946400 200003c0 200003c0 8689c080 00000005 840c6200 e03b9ef4 e03b9ee8 9ee0: 80806388 2e04ab0c e03b9f14 00000000 8689c081 40946400 200003c0 8689c080 9f00: 00000005 840c6200 e03b9fa4 e03b9f18 805baefc 8148c804 00000001 e03b9f54 9f20: e03b9f30 e03b9f40 8025a7a8 8028e484 e03b9f54 e03b9f40 8025a7a8 8028e490 9f40: e03b9fb0 40000000 e03b9f84 e03b9f58 80220bdc 8025a764 00000000 82a1eb0c 9f60: e03b9fb0 0013ea70 ecac8b10 80220b30 00000000 2e04ab0c e03b9fac 00000000 9f80: 00000000 00356310 00000036 8020029c 840c6200 00000036 00000000 e03b9fa8 9fa0: 80200060 805bacc4 00000000 00000000 00000005 40946400 200003c0 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76faa0dc 9fe0: 76fa9e88 76fa9e78 00018ebc 001308d0 60000010 00000005 00000000 00000000 Call trace: [<814a13d8>] (subdev_8255_io) from [<814a1114>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8422e240 r5:00000140 r4:814a13d8 [<814a10bc>] (subdev_8255_do_config) from [<814a14cc>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814a10bc>] (subdev_8255_do_config) from [<814a14cc>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86c1f000 [<814a1444>] (subdev_8255_io_init) from [<814a167c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814a1444>] (subdev_8255_io_init) from [<814a167c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:86c1f000 r5:00000000 r4:8422e240 [<814a1608>] (dev_8255_attach) from [<81490020>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:8422e240 r7:e03b9d90 r6:00000000 r5:8422e240 r4:82bd965c [<8148ff18>] (comedi_device_attach) from [<8148b824>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:840c6200 r9:00000005 r8:00000002 r7:40946400 r6:b5403587 r5:8422e240 r4:200003c0 [<8148b758>] (do_devconfig_ioctl) from [<8148cb4c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:8422e240 r4:8689c080 [<8148c7f8>] (comedi_unlocked_ioctl) from [<805baefc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148c7f8>] (comedi_unlocked_ioctl) from [<805baefc>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148c7f8>] (comedi_unlocked_ioctl) from [<805baefc>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148c7f8>] (comedi_unlocked_ioctl) from [<805baefc>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:840c6200 r9:00000005 r8:8689c080 r7:200003c0 r6:40946400 r5:8689c081 r4:00000000 [<805bacb8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe03b9fa8 to 0xe03b9ff0) 9fa0: 00000000 00000000 00000005 40946400 200003c0 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76faa0dc 9fe0: 76fa9e88 76fa9e78 00018ebc 001308d0 r10:00000036 r9:840c6200 r8:8020029c r7:00000036 r6:00356310 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