8<--- cut here --- Unable to handle kernel paging request at virtual address fee08004 when write [fee08004] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 14869 Comm: syz.3.1710 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 : [<8143e110>] lr : [<8143e0fc>] psr: 60000013 sp : dfa9dcb8 ip : dfa9dcb8 fp : dfa9dcd4 r10: 00000000 r9 : 00000084 r8 : dfa9dda4 r7 : 00008001 r6 : 0000009b r5 : 8339e300 r4 : 00008004 r3 : 0000009b r2 : fee08004 r1 : 00000001 r0 : 8339e300 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86d4c080 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8339e300 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 8339e300 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 0xdfa9c000 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 0xdfa9c000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xdfa9c000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.3.1710 (pid: 14869, stack limit = 0xdfa9c000) Stack: (0xdfa9dcb8 to 0xdfa9e000) dca0: 8143e0b0 00008001 dcc0: 8339e300 00008001 dfa9dcf4 dfa9dcd8 8143ddec 8143e0bc 00008001 dfa9dcf8 dce0: 80522904 860eb400 dfa9dd14 dfa9dcf8 8143e1a4 8143dda0 8339e300 00000000 dd00: 860eb400 00008001 dfa9dd54 dfa9dd18 8143e354 8143e128 82afc67c 84205d00 dd20: 828217c0 00000000 00000000 829d6e04 8339e300 00000000 dfa9dd90 8339e300 dd40: 00000000 82b2efdc dfa9dd8c dfa9dd58 8142cc98 8143e2ec 40946400 00000000 dd60: dfa9dd7c 20000400 8339e300 b5403587 40946400 00000003 00000003 851b9800 dd80: dfa9de4c dfa9dd90 814284a4 8142cb98 35353238 00000000 00000000 00000000 dda0: 00000000 00008001 00000004 00000001 00002f00 00000000 00000cc4 00000009 ddc0: 00000007 00000001 fffffff7 00000002 fffffffd 00000004 00000009 00000001 dde0: 00000005 00000001 00000009 00000001 40000003 00000089 00000209 00000f27 de00: 00000005 00008005 00000043 00000005 00000004 00000006 00010000 fffffff4 de20: 00000000 664aabb7 00000000 861f3600 8339e300 20000400 40946400 00000003 de40: dfa9df14 dfa9de50 814297c8 814283dc 00000000 664aabb7 00000000 00000000 de60: 824b857c dfa9dea4 0000005f 84225be8 00000064 8339e330 dfa9dee4 dfa9de88 de80: 807cd874 807c3c4c 00000064 00000001 00000000 dfa9dea4 867eecd0 834f9bb0 dea0: 00006400 0000000b dfa9de98 00000000 00000000 664aabb7 00000000 861f3600 dec0: 40946400 20000400 20000400 861f3600 00000003 851b9800 dfa9def4 dfa9dee8 dee0: 807cd9a4 664aabb7 dfa9df14 00000000 861f3601 40946400 20000400 861f3600 df00: 00000003 851b9800 dfa9dfa4 dfa9df18 8058f904 81429480 ecac8b10 851b9800 df20: dfa9df3c dfa9df30 81ae1534 81ae1400 dfa9df54 dfa9df40 8025a85c 8028c358 df40: dfa9dfb0 40000000 dfa9df84 dfa9df58 80220bf8 8025a818 00000000 8281d2bc df60: dfa9dfb0 0013e290 ecac8b10 80220b4c 00000000 664aabb7 dfa9dfac 00000000 df80: 00000000 00346310 00000036 8020029c 851b9800 00000036 00000000 dfa9dfa8 dfa0: 80200060 8058f6cc 00000000 00000000 00000003 40946400 20000400 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ffe0dc dfe0: 76ffde88 76ffde78 00018ba0 001300f0 60000010 00000003 00000000 00000000 Call trace: [<8143e0b0>] (subdev_8255_io) from [<8143ddec>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00008001 r6:8339e300 r5:00008001 r4:8143e0b0 [<8143dd94>] (subdev_8255_do_config) from [<8143e1a4>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8143dd94>] (subdev_8255_do_config) from [<8143e1a4>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:860eb400 [<8143e11c>] (subdev_8255_io_init) from [<8143e354>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8143e11c>] (subdev_8255_io_init) from [<8143e354>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00008001 r6:860eb400 r5:00000000 r4:8339e300 [<8143e2e0>] (dev_8255_attach) from [<8142cc98>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2efdc r9:00000000 r8:8339e300 r7:dfa9dd90 r6:00000000 r5:8339e300 r4:829d6e04 [<8142cb8c>] (comedi_device_attach) from [<814284a4>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:851b9800 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8339e300 r4:20000400 [<814283d0>] (do_devconfig_ioctl) from [<814297c8>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:20000400 r5:8339e300 r4:861f3600 [<81429474>] (comedi_unlocked_ioctl) from [<8058f904>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81429474>] (comedi_unlocked_ioctl) from [<8058f904>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81429474>] (comedi_unlocked_ioctl) from [<8058f904>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81429474>] (comedi_unlocked_ioctl) from [<8058f904>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:851b9800 r9:00000003 r8:861f3600 r7:20000400 r6:40946400 r5:861f3601 r4:00000000 [<8058f6c0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa9dfa8 to 0xdfa9dff0) dfa0: 00000000 00000000 00000003 40946400 20000400 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ffe0dc dfe0: 76ffde88 76ffde78 00018ba0 001300f0 r10:00000036 r9:851b9800 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