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: 1 UID: 0 PID: 23286 Comm: syz.5.4651 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 : [<814a14b8>] lr : [<814a14a4>] psr: 60000013 sp : dfb81cb8 ip : dfb81cb8 fp : dfb81cd4 r10: 00000100 r9 : 00000004 r8 : dfb81da4 r7 : 00000000 r6 : 0000009b r5 : 8315bcc0 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 8315bcc0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 863caf00 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8315bcc0 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 8315bcc0 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 0xdfb80000 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 0xdfb80000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfb80000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.5.4651 (pid: 23286, stack limit = 0xdfb80000) Stack: (0xdfb81cb8 to 0xdfb82000) 1ca0: 814a1458 00000100 1cc0: 8315bcc0 00000000 dfb81cf4 dfb81cd8 814a1194 814a1464 00000100 805462cc 1ce0: 86243400 86243400 dfb81d14 dfb81cf8 814a154c 814a1148 8315bcc0 00000000 1d00: 86243400 00000000 dfb81d54 dfb81d18 814a16fc 814a14d0 ffffffff 00000004 1d20: 82a22dc0 00000000 00000000 82bd965c 8315bcc0 00000000 dfb81d90 8315bcc0 1d40: 00000000 82d30dfc dfb81d8c dfb81d58 814900a0 814a1694 40946400 00000000 1d60: dfb81d7c 20000240 8315bcc0 b5403587 40946400 00000003 00000003 8331ee40 1d80: dfb81e4c dfb81d90 8148b8a4 8148ffa4 35353238 00000000 00000000 00000000 1da0: 00000000 00000100 00000004 00013600 00000006 00000000 00010005 00000079 1dc0: 00000003 00080008 00000005 00000002 04000064 00000007 00000001 00000006 1de0: 000000fd 00000006 00000000 00000003 00000007 0000b740 0000ca9f 00000006 1e00: 20001e58 00000008 0000f39e 00000003 1539b804 00000007 00000001 00000002 1e20: 00000000 b4f436af 00000000 86541400 8315bcc0 20000240 40946400 00000003 1e40: dfb81f14 dfb81e50 8148cbcc 8148b7e4 00000000 b4f436af 00000000 00000000 1e60: 8254980c dfb81ea4 0000005f 84588990 00000064 8315bcf0 dfb81ee4 dfb81e88 1e80: 808062d4 807fc98c 00000064 00000001 00000000 dfb81ea4 86562110 834e3550 1ea0: 00006400 0000000b dfb81e98 00000000 00000000 b4f436af 00000000 86541400 1ec0: 40946400 20000240 20000240 86541400 00000003 8331ee40 dfb81ef4 dfb81ee8 1ee0: 80806408 b4f436af dfb81f14 00000000 86541401 40946400 20000240 86541400 1f00: 00000003 8331ee40 dfb81fa4 dfb81f18 805baf7c 8148c884 ecac8b10 8331ee40 1f20: dfb81f3c dfb81f30 81b5a5e0 81b5a4ac dfb81f54 dfb81f40 8025a7a8 8028e490 1f40: dfb81fb0 40000000 dfb81f84 dfb81f58 80220bdc 8025a764 00000000 82a1eb0c 1f60: dfb81fb0 0013ea70 ecac8b10 80220b30 00000000 b4f436af dfb81fac 00000000 1f80: 00000000 00356310 00000036 8020029c 8331ee40 00000036 00000000 dfb81fa8 1fa0: 80200060 805bad44 00000000 00000000 00000003 40946400 20000240 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fc00dc 1fe0: 76fbfe88 76fbfe78 00018ebc 001308d0 60000010 00000003 00000000 00000000 Call trace: [<814a1458>] (subdev_8255_io) from [<814a1194>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8315bcc0 r5:00000100 r4:814a1458 [<814a113c>] (subdev_8255_do_config) from [<814a154c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814a113c>] (subdev_8255_do_config) from [<814a154c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86243400 [<814a14c4>] (subdev_8255_io_init) from [<814a16fc>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814a14c4>] (subdev_8255_io_init) from [<814a16fc>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:86243400 r5:00000000 r4:8315bcc0 [<814a1688>] (dev_8255_attach) from [<814900a0>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:8315bcc0 r7:dfb81d90 r6:00000000 r5:8315bcc0 r4:82bd965c [<8148ff98>] (comedi_device_attach) from [<8148b8a4>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:8331ee40 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8315bcc0 r4:20000240 [<8148b7d8>] (do_devconfig_ioctl) from [<8148cbcc>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000240 r5:8315bcc0 r4:86541400 [<8148c878>] (comedi_unlocked_ioctl) from [<805baf7c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148c878>] (comedi_unlocked_ioctl) from [<805baf7c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148c878>] (comedi_unlocked_ioctl) from [<805baf7c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148c878>] (comedi_unlocked_ioctl) from [<805baf7c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8331ee40 r9:00000003 r8:86541400 r7:20000240 r6:40946400 r5:86541401 r4:00000000 [<805bad38>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb81fa8 to 0xdfb81ff0) 1fa0: 00000000 00000000 00000003 40946400 20000240 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fc00dc 1fe0: 76fbfe88 76fbfe78 00018ebc 001308d0 r10:00000036 r9:8331ee40 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