8<--- cut here --- Unable to handle kernel paging request at virtual address fee00007 when write [fee00007] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 25542 Comm: syz.4.14111 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 : [<8149df48>] lr : [<8149df34>] psr: 60000013 sp : dfd45cb8 ip : dfd45cb8 fp : dfd45cd4 r10: 00000004 r9 : 00000004 r8 : dfd45da4 r7 : 00000000 r6 : 0000009b r5 : 831d00c0 r4 : 00000007 r3 : 0000009b r2 : fee00007 r1 : 00000001 r0 : 831d00c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86fc3f40 DAC: fffffffd Register r0 information: slab kmalloc-192 start 831d00c0 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 831d00c0 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 0xdfd44000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfd44000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Register r12 information: 2-page vmalloc region starting at 0xdfd44000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Process syz.4.14111 (pid: 25542, stack limit = 0xdfd44000) Stack: (0xdfd45cb8 to 0xdfd46000) 5ca0: 8149dee8 00000004 5cc0: 831d00c0 00000000 dfd45cf4 dfd45cd8 8149dc24 8149def4 00000004 80545e10 5ce0: 854d8000 854d8000 dfd45d14 dfd45cf8 8149dfdc 8149dbd8 831d00c0 00000000 5d00: 854d8000 00000000 dfd45d54 dfd45d18 8149e18c 8149df60 ffffffff 00000004 5d20: 82a22dc0 00000000 00000000 82bd9600 831d00c0 00000000 dfd45d90 831d00c0 5d40: 00000000 82d30dfc dfd45d8c dfd45d58 8148cb2c 8149e124 40946400 00000000 5d60: dfd45d7c 200000c0 831d00c0 b5403587 40946400 00000003 00000003 8adf3100 5d80: dfd45e4c dfd45d90 81488330 8148ca30 35353238 00000000 00000000 00000000 5da0: 00000000 00000004 00000006 00000f01 00000007 00000011 00000005 00000079 5dc0: 00000003 00080008 00000109 000003ff 00000001 00000006 00000001 00000d12 5de0: 00000006 ffffffbb 20000009 00000003 7fffffff ffffffff 0000ca9f 0000017f 5e00: 00200008 fffffffb 0000f39a fffffffc 00000008 0000a6b3 2f000000 fffffff8 5e20: 00000000 9fc8adfe 00000000 86189700 831d00c0 200000c0 40946400 00000003 5e40: dfd45f14 dfd45e50 81489658 81488270 dfd45e4c 9fc8adfe 00000000 00000000 5e60: 8254880c dfd45ea4 0000005f 84402408 00000064 831d00f0 dfd45ee4 dfd45e88 5e80: 80804edc 807fb20c 00000064 00000001 00000000 dfd45ea4 84f65a10 834eac38 5ea0: 00006400 0000000b dfd45e98 00000000 dfd45d38 9fc8adfe 00000000 86189700 5ec0: 40946400 200000c0 200000c0 86189700 00000003 8adf3100 dfd45ef4 dfd45ee8 5ee0: 80805010 9fc8adfe dfd45f14 00000000 86189701 40946400 200000c0 86189700 5f00: 00000003 8adf3100 dfd45fa4 dfd45f18 805ba7e8 81489310 ecac8b10 8adf3100 5f20: dfd45f3c dfd45f30 81b546a0 81b5456c dfd45f54 dfd45f40 8025a7ac 8028e488 5f40: dfd45fb0 40000000 dfd45f84 dfd45f58 80220bdc 8025a768 00000000 82a1eb0c 5f60: dfd45fb0 0013e9c0 ecac8b10 80220b30 00000000 9fc8adfe dfd45fac 00000000 5f80: 00000000 00346310 00000036 8020029c 8adf3100 00000036 00000000 dfd45fa8 5fa0: 80200060 805ba5b0 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f900dc 5fe0: 76f8fe88 76f8fe78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<8149dee8>] (subdev_8255_io) from [<8149dc24>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:831d00c0 r5:00000004 r4:8149dee8 [<8149dbcc>] (subdev_8255_do_config) from [<8149dfdc>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8149dbcc>] (subdev_8255_do_config) from [<8149dfdc>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:854d8000 [<8149df54>] (subdev_8255_io_init) from [<8149e18c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8149df54>] (subdev_8255_io_init) from [<8149e18c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:854d8000 r5:00000000 r4:831d00c0 [<8149e118>] (dev_8255_attach) from [<8148cb2c>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:831d00c0 r7:dfd45d90 r6:00000000 r5:831d00c0 r4:82bd9600 [<8148ca24>] (comedi_device_attach) from [<81488330>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:8adf3100 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:831d00c0 r4:200000c0 [<81488264>] (do_devconfig_ioctl) from [<81489658>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:200000c0 r5:831d00c0 r4:86189700 [<81489304>] (comedi_unlocked_ioctl) from [<805ba7e8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81489304>] (comedi_unlocked_ioctl) from [<805ba7e8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81489304>] (comedi_unlocked_ioctl) from [<805ba7e8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81489304>] (comedi_unlocked_ioctl) from [<805ba7e8>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8adf3100 r9:00000003 r8:86189700 r7:200000c0 r6:40946400 r5:86189701 r4:00000000 [<805ba5a4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfd45fa8 to 0xdfd45ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f900dc 5fe0: 76f8fe88 76f8fe78 00018ebc 00130820 r10:00000036 r9:8adf3100 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