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: 13542 Comm: syz.5.1825 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 : [<814a3dac>] lr : [<814a3d98>] psr: 60000013 sp : dfbddcb8 ip : dfbddcb8 fp : dfbddcd4 r10: 00000100 r9 : 00000004 r8 : dfbddda4 r7 : 00000000 r6 : 0000009b r5 : 8425c9c0 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 8425c9c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 878a7400 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8425c9c0 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 8425c9c0 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 0xdfbdc000 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 0xdfbdc000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfbdc000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.5.1825 (pid: 13542, stack limit = 0xdfbdc000) Stack: (0xdfbddcb8 to 0xdfbde000) dca0: 814a3d4c 00000100 dcc0: 8425c9c0 00000000 dfbddcf4 dfbddcd8 814a3a88 814a3d58 00000100 80547708 dce0: 86a76c00 86a76c00 dfbddd14 dfbddcf8 814a3e40 814a3a3c 8425c9c0 00000000 dd00: 86a76c00 00000000 dfbddd54 dfbddd18 814a3ff0 814a3dc4 ffffffff 00000004 dd20: 82a22dc0 00000000 00000000 82bd9660 8425c9c0 00000000 dfbddd90 8425c9c0 dd40: 00000000 82d30eb4 dfbddd8c dfbddd58 81492978 814a3f88 40946400 00000000 dd60: dfbddd7c 20000240 8425c9c0 b5403587 40946400 00000003 00000003 83ff3100 dd80: dfbdde4c dfbddd90 8148e17c 8149287c 35353238 00000000 00000000 00000000 dda0: 00000000 00000100 00000004 00000fff 00000006 00000000 00000006 00000004 ddc0: 00000003 00080008 00000005 00000002 00000063 00000007 00000001 00000006 dde0: 000000fd 00000007 00000009 00000003 00000001 0000b740 0000007f 00000009 de00: 20001e58 00000008 0000f39e 00000004 1539b804 00000008 fffffffe 00000002 de20: 00000000 af232640 00000000 86de9600 8425c9c0 20000240 40946400 00000003 de40: dfbddf14 dfbdde50 8148f4a4 8148e0bc 00000000 af232640 00000000 00000000 de60: 8254a844 dfbddea4 0000005f 845ea7b8 00000064 8425c9f0 dfbddee4 dfbdde88 de80: 80807df4 807fe4ac 00000064 00000001 00000000 dfbddea4 85fdb810 8343ba18 dea0: 00006400 0000000b dfbdde98 00000000 00000000 af232640 00000000 86de9600 dec0: 40946400 20000240 20000240 86de9600 00000003 83ff3100 dfbddef4 dfbddee8 dee0: 80807f28 af232640 dfbddf14 00000000 86de9601 40946400 20000240 86de9600 df00: 00000003 83ff3100 dfbddfa4 dfbddf18 805bc58c 8148f15c ecac8b10 83ff3100 df20: dfbddf3c dfbddf30 81b5e560 81b5e42c dfbddf54 dfbddf40 8025b7a8 8028f490 df40: dfbddfb0 40000000 dfbddf84 dfbddf58 80221bdc 8025b764 00000000 82a1eb0c df60: dfbddfb0 0013eb70 ecac8b10 80221b30 00000000 af232640 dfbddfac 00000000 df80: 00000000 00356310 00000036 8020029c 83ff3100 00000036 00000000 dfbddfa8 dfa0: 80200060 805bc354 00000000 00000000 00000003 40946400 20000240 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fa30dc dfe0: 76fa2e88 76fa2e78 00018fa0 001309d0 60000010 00000003 00000000 00000000 Call trace: [<814a3d4c>] (subdev_8255_io) from [<814a3a88>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8425c9c0 r5:00000100 r4:814a3d4c [<814a3a30>] (subdev_8255_do_config) from [<814a3e40>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814a3a30>] (subdev_8255_do_config) from [<814a3e40>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86a76c00 [<814a3db8>] (subdev_8255_io_init) from [<814a3ff0>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814a3db8>] (subdev_8255_io_init) from [<814a3ff0>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:86a76c00 r5:00000000 r4:8425c9c0 [<814a3f7c>] (dev_8255_attach) from [<81492978>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30eb4 r9:00000000 r8:8425c9c0 r7:dfbddd90 r6:00000000 r5:8425c9c0 r4:82bd9660 [<81492870>] (comedi_device_attach) from [<8148e17c>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:83ff3100 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8425c9c0 r4:20000240 [<8148e0b0>] (do_devconfig_ioctl) from [<8148f4a4>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000240 r5:8425c9c0 r4:86de9600 [<8148f150>] (comedi_unlocked_ioctl) from [<805bc58c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148f150>] (comedi_unlocked_ioctl) from [<805bc58c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148f150>] (comedi_unlocked_ioctl) from [<805bc58c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148f150>] (comedi_unlocked_ioctl) from [<805bc58c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83ff3100 r9:00000003 r8:86de9600 r7:20000240 r6:40946400 r5:86de9601 r4:00000000 [<805bc348>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbddfa8 to 0xdfbddff0) dfa0: 00000000 00000000 00000003 40946400 20000240 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fa30dc dfe0: 76fa2e88 76fa2e78 00018fa0 001309d0 r10:00000036 r9:83ff3100 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