8<--- cut here --- Unable to handle kernel paging request at virtual address fee01003 when write [fee01003] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 5083 Comm: syz.2.206 Not tainted syzkaller #0 PREEMPT 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 : [<81465558>] lr : [<81465544>] psr: 60000013 sp : ea919cb8 ip : ea919cb8 fp : ea919cd4 r10: 00001000 r9 : 00000004 r8 : ea919da4 r7 : 00000000 r6 : 0000009b r5 : 84722540 r4 : 00001003 r3 : 0000009b r2 : fee01003 r1 : 00000001 r0 : 84722540 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84eb4200 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84722540 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 84722540 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 0xea918000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xea918000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xea918000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Process syz.2.206 (pid: 5083, stack limit = 0xea918000) Stack: (0xea919cb8 to 0xea91a000) 9ca0: 814654f8 00001000 9cc0: 84722540 00000000 ea919cf4 ea919cd8 81465234 81465504 00001000 805320dc 9ce0: 85868000 85868000 ea919d14 ea919cf8 814655ec 814651e8 84722540 00000000 9d00: 85868000 00000000 ea919d54 ea919d18 8146579c 81465570 ffffffff 00000004 9d20: 82a205c0 00000000 00000000 82bd2f5c 84722540 00000000 ea919d90 84722540 9d40: 00000000 82d2bdc4 ea919d8c ea919d58 81454124 81465734 40946400 00000000 9d60: ea919d7c 20000380 84722540 b5403587 40946400 00000001 00000005 8380b100 9d80: ea919e4c ea919d90 8144f930 81454028 35353238 00000000 00000000 00000000 9da0: 00000000 00001000 00002080 00000a1a 00000004 00000006 0800afa3 00000000 9dc0: 00000002 00005855 00000002 0000000b 000007ff 00000001 00000005 00000006 9de0: 00000002 00000000 00000004 00000002 0000000a 00000008 0000caa2 00001003 9e00: 20001e5b 02000003 00000e69 00000002 00000004 00004086 00000000 000006f5 9e20: 00000000 3646f5f1 00000000 85b55800 84722540 20000380 40946400 00000001 9e40: ea919f14 ea919e50 81450c54 8144f868 00000000 3646f5f1 00000000 00000000 9e60: 82530804 ea919ea4 0000005f 8415d4a0 00000064 84722570 ea919ee4 ea919e88 9e80: 807e8ff0 807df304 00000064 00000001 00000000 ea919ea4 8335e550 834e6ee0 9ea0: 00006400 0000000b ea919e98 00000000 00000000 3646f5f1 00000000 85b55800 9ec0: 40946400 20000380 20000380 85b55800 00000005 8380b100 ea919ef4 ea919ee8 9ee0: 807e9124 3646f5f1 ea919f14 00000000 85b55801 40946400 20000380 85b55800 9f00: 00000005 8380b100 ea919fa4 ea919f18 805a16e0 8145090c ecac8b10 8380b100 9f20: ea919f3c ea919f30 81b15274 81b15140 ea919f54 ea919f40 8025a664 8028e168 9f40: ea919fb0 40000000 ea919f84 ea919f58 80220be0 8025a620 00000000 82a1c2fc 9f60: ea919fb0 0013e940 ecac8b10 80220b34 00000000 3646f5f1 ea919fac 00000000 9f80: 00000000 003463b0 00000036 8020029c 8380b100 00000036 00000000 ea919fa8 9fa0: 80200060 805a14a8 00000000 00000000 00000005 40946400 20000380 00000000 9fc0: 00000000 00000000 003463b0 00000036 00346378 00000000 00000001 76f3f0dc 9fe0: 76f3ee88 76f3ee78 00018e58 001307a0 60000010 00000005 00000000 00000000 Call trace: [<814654f8>] (subdev_8255_io) from [<81465234>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:84722540 r5:00001000 r4:814654f8 [<814651dc>] (subdev_8255_do_config) from [<814655ec>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814651dc>] (subdev_8255_do_config) from [<814655ec>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85868000 [<81465564>] (subdev_8255_io_init) from [<8146579c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<81465564>] (subdev_8255_io_init) from [<8146579c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:85868000 r5:00000000 r4:84722540 [<81465728>] (dev_8255_attach) from [<81454124>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2bdc4 r9:00000000 r8:84722540 r7:ea919d90 r6:00000000 r5:84722540 r4:82bd2f5c [<8145401c>] (comedi_device_attach) from [<8144f930>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:8380b100 r9:00000005 r8:00000001 r7:40946400 r6:b5403587 r5:84722540 r4:20000380 [<8144f85c>] (do_devconfig_ioctl) from [<81450c54>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000380 r5:84722540 r4:85b55800 [<81450900>] (comedi_unlocked_ioctl) from [<805a16e0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81450900>] (comedi_unlocked_ioctl) from [<805a16e0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81450900>] (comedi_unlocked_ioctl) from [<805a16e0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81450900>] (comedi_unlocked_ioctl) from [<805a16e0>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8380b100 r9:00000005 r8:85b55800 r7:20000380 r6:40946400 r5:85b55801 r4:00000000 [<805a149c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea919fa8 to 0xea919ff0) 9fa0: 00000000 00000000 00000005 40946400 20000380 00000000 9fc0: 00000000 00000000 003463b0 00000036 00346378 00000000 00000001 76f3f0dc 9fe0: 76f3ee88 76f3ee78 00018e58 001307a0 r10:00000036 r9:8380b100 r8:8020029c r7:00000036 r6:003463b0 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