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: 7371 Comm: syz.2.920 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 : [<814a3ef4>] lr : [<814a3ee0>] psr: 60000013 sp : dfaedcb8 ip : dfaedcb8 fp : dfaedcd4 r10: 00000140 r9 : 00000004 r8 : dfaedda4 r7 : 00000000 r6 : 0000009b r5 : 8464c3c0 r4 : 00000143 r3 : 0000009b r2 : fee00143 r1 : 00000001 r0 : 8464c3c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8636bcc0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8464c3c0 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 8464c3c0 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 0xdfaec000 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 0xdfaec000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfaec000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.2.920 (pid: 7371, stack limit = 0xdfaec000) Stack: (0xdfaedcb8 to 0xdfaee000) dca0: 814a3e94 00000140 dcc0: 8464c3c0 00000000 dfaedcf4 dfaedcd8 814a3bd0 814a3ea0 00000140 805476a0 dce0: 861ba000 861ba000 dfaedd14 dfaedcf8 814a3f88 814a3b84 8464c3c0 00000000 dd00: 861ba000 00000000 dfaedd54 dfaedd18 814a4138 814a3f0c ffffffff 00000004 dd20: 00000000 00000000 8464c3c0 82bd9a60 8464c3c0 00000000 dfaedd90 8464c3c0 dd40: 00000000 82d31eb4 dfaedd8c dfaedd58 81492ac0 814a40d0 40946400 00000000 dd60: dfaedd7c 200000c0 8464c3c0 b5403587 40946400 00000001 00000003 840c8c40 dd80: dfaede4c dfaedd90 8148e2c4 814929c4 35353238 00000000 00000000 00000000 dda0: 00000000 00000140 00000020 0000000b 00000002 00000400 00000001 00007fff ddc0: 30000002 00000007 0000c72d 00000006 00000007 00000001 00000008 00000029 dde0: 000072f0 00000101 00000006 00000006 00000401 00000004 00000006 0000a2d8 de00: 00000009 00001000 00000008 0000000a ffffffff 00000383 00008001 00000004 de20: 00000000 59ffe4b9 00000000 85b17500 8464c3c0 200000c0 40946400 00000001 de40: dfaedf14 dfaede50 8148f5ec 8148e204 00000000 59ffe4b9 00000000 00000000 de60: 8254c844 dfaedea4 0000005f 8415ad40 00000064 8464c3f0 dfaedee4 dfaede88 de80: 80807d74 807fe42c 00000064 00000001 00000000 dfaedea4 86378010 834e3ee0 dea0: 00006400 0000000b dfaede98 00000000 00000000 59ffe4b9 00000000 85b17500 dec0: 40946400 200000c0 200000c0 85b17500 00000003 840c8c40 dfaedef4 dfaedee8 dee0: 80807ea8 59ffe4b9 dfaedf14 00000000 85b17501 40946400 200000c0 85b17500 df00: 00000003 840c8c40 dfaedfa4 dfaedf18 805bc524 8148f2a4 ecac8b10 840c8c40 df20: dfaedf3c dfaedf30 81b65280 81b6514c dfaedf54 dfaedf40 8025b7a8 8028f458 df40: dfaedfb0 40000000 dfaedf84 dfaedf58 80221bdc 8025b764 00000000 82a1eb0c df60: dfaedfb0 0013eb70 ecac8b10 80221b30 00000000 59ffe4b9 dfaedfac 00000000 df80: 00000000 00356310 00000036 8020029c 840c8c40 00000036 00000000 dfaedfa8 dfa0: 80200060 805bc2ec 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fc30dc dfe0: 76fc2e88 76fc2e78 00018fa0 001309d0 60000010 00000003 00000000 00000000 Call trace: [<814a3e94>] (subdev_8255_io) from [<814a3bd0>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8464c3c0 r5:00000140 r4:814a3e94 [<814a3b78>] (subdev_8255_do_config) from [<814a3f88>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814a3b78>] (subdev_8255_do_config) from [<814a3f88>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:861ba000 [<814a3f00>] (subdev_8255_io_init) from [<814a4138>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814a3f00>] (subdev_8255_io_init) from [<814a4138>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:861ba000 r5:00000000 r4:8464c3c0 [<814a40c4>] (dev_8255_attach) from [<81492ac0>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d31eb4 r9:00000000 r8:8464c3c0 r7:dfaedd90 r6:00000000 r5:8464c3c0 r4:82bd9a60 [<814929b8>] (comedi_device_attach) from [<8148e2c4>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:840c8c40 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:8464c3c0 r4:200000c0 [<8148e1f8>] (do_devconfig_ioctl) from [<8148f5ec>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:200000c0 r5:8464c3c0 r4:85b17500 [<8148f298>] (comedi_unlocked_ioctl) from [<805bc524>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148f298>] (comedi_unlocked_ioctl) from [<805bc524>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148f298>] (comedi_unlocked_ioctl) from [<805bc524>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148f298>] (comedi_unlocked_ioctl) from [<805bc524>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:840c8c40 r9:00000003 r8:85b17500 r7:200000c0 r6:40946400 r5:85b17501 r4:00000000 [<805bc2e0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfaedfa8 to 0xdfaedff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fc30dc dfe0: 76fc2e88 76fc2e78 00018fa0 001309d0 r10:00000036 r9:840c8c40 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