8<--- cut here --- Unable to handle kernel paging request at virtual address fee00103 when write [fee00103] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 13381 Comm: syz.2.1224 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 : [<81488750>] lr : [<8148873c>] psr: 60000013 sp : e0105cb8 ip : e0105cb8 fp : e0105cd4 r10: 00000100 r9 : 00000004 r8 : e0105da4 r7 : 00000000 r6 : 0000009b r5 : 8301ab40 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 8301ab40 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 863cd4c0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8301ab40 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 8301ab40 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 0xe0104000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xe0104000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Register r12 information: 2-page vmalloc region starting at 0xe0104000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Process syz.2.1224 (pid: 13381, stack limit = 0xe0104000) Stack: (0xe0105cb8 to 0xe0106000) 5ca0: 814886f0 00000100 5cc0: 8301ab40 00000000 e0105cf4 e0105cd8 8148842c 814886fc 00000100 80544fcc 5ce0: 86bb7000 86bb7000 e0105d14 e0105cf8 814887e4 814883e0 8301ab40 00000000 5d00: 86bb7000 00000000 e0105d54 e0105d18 81488994 81488768 ffffffff 00000004 5d20: 82a22d40 00000000 00000000 82bd6c80 8301ab40 00000000 e0105d90 8301ab40 5d40: 00000000 82d2c99c e0105d8c e0105d58 81477338 8148892c 40946400 00000000 5d60: e0105d7c 20000240 8301ab40 b5403587 40946400 00000003 00000003 847c1880 5d80: e0105e4c e0105d90 81472b44 8147723c 35353238 00000000 00000000 00000000 5da0: 00000000 00000100 00000009 00013600 00000006 00000007 00010025 00000009 5dc0: 00020003 00080408 00000005 00000002 00000065 00000007 00000003 00000006 5de0: 000000fd 00000003 00000007 00004003 04000000 0000b740 0000ca9f 00000009 5e00: 20001e58 00000008 00000007 00000003 00000003 00000007 00000001 00000002 5e20: 00000000 618da119 00000000 83b0ee80 8301ab40 20000240 40946400 00000003 5e40: e0105f14 e0105e50 81473e68 81472a7c 00000000 618da119 00000000 00000000 5e60: 8254080c e0105ea4 0000005f 84460230 00000064 8301ab70 e0105ee4 e0105e88 5e80: 80802f88 807f92b8 00000064 00000001 00000000 e0105ea4 83871110 834de330 5ea0: 00006400 0000000b e0105e98 00000000 00000000 618da119 00000000 83b0ee80 5ec0: 40946400 20000240 20000240 83b0ee80 00000003 847c1880 e0105ef4 e0105ee8 5ee0: 808030bc 618da119 e0105f14 00000000 83b0ee81 40946400 20000240 83b0ee80 5f00: 00000003 847c1880 e0105fa4 e0105f18 805b9fc0 81473b20 ecac8b10 847c1880 5f20: e0105f3c e0105f30 81b3e3a0 81b3e26c e0105f54 e0105f40 8025a7f0 8028e4c8 5f40: e0105fb0 40000000 e0105f84 e0105f58 80220bdc 8025a7ac 00000000 82a1ea8c 5f60: e0105fb0 0013e9c0 ecac8b10 80220b30 00000000 618da119 e0105fac 00000000 5f80: 00000000 00346310 00000036 8020029c 847c1880 00000036 00000000 e0105fa8 5fa0: 80200060 805b9d88 00000000 00000000 00000003 40946400 20000240 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f710dc 5fe0: 76f70e88 76f70e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<814886f0>] (subdev_8255_io) from [<8148842c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8301ab40 r5:00000100 r4:814886f0 [<814883d4>] (subdev_8255_do_config) from [<814887e4>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814883d4>] (subdev_8255_do_config) from [<814887e4>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86bb7000 [<8148875c>] (subdev_8255_io_init) from [<81488994>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8148875c>] (subdev_8255_io_init) from [<81488994>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:86bb7000 r5:00000000 r4:8301ab40 [<81488920>] (dev_8255_attach) from [<81477338>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2c99c r9:00000000 r8:8301ab40 r7:e0105d90 r6:00000000 r5:8301ab40 r4:82bd6c80 [<81477230>] (comedi_device_attach) from [<81472b44>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:847c1880 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301ab40 r4:20000240 [<81472a70>] (do_devconfig_ioctl) from [<81473e68>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000240 r5:8301ab40 r4:83b0ee80 [<81473b14>] (comedi_unlocked_ioctl) from [<805b9fc0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81473b14>] (comedi_unlocked_ioctl) from [<805b9fc0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81473b14>] (comedi_unlocked_ioctl) from [<805b9fc0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81473b14>] (comedi_unlocked_ioctl) from [<805b9fc0>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:847c1880 r9:00000003 r8:83b0ee80 r7:20000240 r6:40946400 r5:83b0ee81 r4:00000000 [<805b9d7c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0105fa8 to 0xe0105ff0) 5fa0: 00000000 00000000 00000003 40946400 20000240 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f710dc 5fe0: 76f70e88 76f70e78 00018ebc 00130820 r10:00000036 r9:847c1880 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