8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2a when write [fee04f2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 8674 Comm: syz.1.1188 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 : [<813db898>] lr : [<813db884>] psr: 60000013 sp : e0035cb8 ip : e0035cb8 fp : e0035cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 84112840 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 84112840 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86002480 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84112840 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:1055 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 84112840 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: non-paged memory Register r9 information: NULL pointer Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xe0034000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xe0034000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.1.1188 (pid: 8674, stack limit = 0xe0034000) Stack: (0xe0035cb8 to 0xe0036000) 5ca0: 813db838 84112840 5cc0: 00004f27 00004f27 e0035cf4 e0035cd8 813db570 813db844 00004f27 8050a88c 5ce0: 855ea000 855ea000 e0035d14 e0035cf8 813db930 813db524 855ea000 84112840 5d00: e0035da4 00004f27 e0035d54 e0035d18 813dbb24 813db8b0 82af1fe0 85983580 5d20: 828215f0 00000000 00000000 829d23cc 84112840 84112884 e0035d90 84112840 5d40: 00000000 82b25910 e0035d8c e0035d58 813caa20 813dba74 200000c0 00000000 5d60: e0035d7c 200000c0 84112840 b5403587 200000c0 83886000 40946400 00000003 5d80: e0035e4c e0035d90 813c656c 813ca924 35353238 00000000 00000000 00000000 5da0: 00000000 00004f27 00000005 00000002 00000401 00000001 00000cc6 00000fff 5dc0: 5c952399 00000048 000003ff 00000802 00000002 00000003 00000001 00000009 5de0: 0000e1cb 00000006 00080004 00000003 00000392 00000002 fffffffd 00000000 5e00: fffffff5 ffffeadb 00000003 0000003c 00000008 00000004 08000000 00000009 5e20: 00000000 618c34d8 00000000 8a25f900 84112840 200000c0 200000c0 83886000 5e40: e0035f14 e0035e50 813c7538 813c6478 00000000 00000000 00000000 618c34d8 5e60: 00000000 00000000 824625b4 0000005f 83bdd210 84112870 841e090c 83886000 5e80: e0035ee4 e0035e90 807a7cbc 8079e0b4 00000064 00000001 00000000 e0035eac 5ea0: 858a9550 834e5880 00006400 0000000b e0035ea0 00000000 00000000 618c34d8 5ec0: 8a25f900 40946400 200000c0 200000c0 8a25f900 00000003 e0035ef4 e0035ee8 5ee0: 807a7ddc 618c34d8 e0035f14 40946400 00000000 8a25f901 200000c0 8a25f900 5f00: 00000003 83886000 e0035fa4 e0035f18 80578ee0 813c6f68 ecac8b10 83886000 5f20: e0035f3c e0035f30 81a60dc0 81a60c90 e0035f54 e0035f40 8025c484 8028d914 5f40: e0035fb0 40000000 e0035f84 e0035f58 802229ec 8025c440 00000000 8281cfb4 5f60: e0035fb0 0014ced0 ecac8b10 80222940 00000000 618c34d8 e0035fac 00000000 5f80: 00000000 00316308 00000036 8020029c 83886000 00000036 00000000 e0035fa8 5fa0: 80200060 80578dbc 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f590bc 5fe0: 76f58ec0 76f58eb0 0001928c 00132970 60000010 00000003 00000000 00000000 Call trace: [<813db838>] (subdev_8255_io) from [<813db570>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:84112840 r4:813db838 [<813db518>] (subdev_8255_do_config) from [<813db930>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813db518>] (subdev_8255_do_config) from [<813db930>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:855ea000 [<813db8a4>] (subdev_8255_io_init) from [<813dbb24>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813db8a4>] (subdev_8255_io_init) from [<813dbb24>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:e0035da4 r5:84112840 r4:855ea000 [<813dba68>] (dev_8255_attach) from [<813caa20>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:84112840 r7:e0035d90 r6:84112884 r5:84112840 r4:829d23cc [<813ca918>] (comedi_device_attach) from [<813c656c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83886000 r7:200000c0 r6:b5403587 r5:84112840 r4:200000c0 [<813c646c>] (do_devconfig_ioctl) from [<813c7538>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83886000 r7:200000c0 r6:200000c0 r5:84112840 r4:8a25f900 [<813c6f5c>] (comedi_unlocked_ioctl) from [<80578ee0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6f5c>] (comedi_unlocked_ioctl) from [<80578ee0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6f5c>] (comedi_unlocked_ioctl) from [<80578ee0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6f5c>] (comedi_unlocked_ioctl) from [<80578ee0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83886000 r9:00000003 r8:8a25f900 r7:200000c0 r6:8a25f901 r5:00000000 r4:40946400 [<80578db0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0035fa8 to 0xe0035ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f590bc 5fe0: 76f58ec0 76f58eb0 0001928c 00132970 r10:00000036 r9:83886000 r8:8020029c r7:00000036 r6:00316308 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