8<--- cut here --- Unable to handle kernel paging request at virtual address fee000a7 when write [fee000a7] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 8775 Comm: syz.3.1210 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 : [<813dbc18>] lr : [<813dbc04>] psr: 60000013 sp : ea4ddcb8 ip : ea4ddcb8 fp : ea4ddcd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 000000a4 r6 : 0000009b r5 : 8407f3c0 r4 : 000000a7 r3 : 0000009b r2 : fee000a7 r1 : 00000001 r0 : 8407f3c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85b9ed80 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8407f3c0 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 8407f3c0 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 0xea4dc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xea4dc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.3.1210 (pid: 8775, stack limit = 0xea4dc000) Stack: (0xea4ddcb8 to 0xea4de000) dca0: 813dbbb8 8407f3c0 dcc0: 000000a4 000000a4 ea4ddcf4 ea4ddcd8 813db8f0 813dbbc4 000000a4 8050a7fc dce0: 8585a000 8585a000 ea4ddd14 ea4ddcf8 813dbcb0 813db8a4 8585a000 8407f3c0 dd00: ea4ddda4 000000a4 ea4ddd54 ea4ddd18 813dbea4 813dbc30 82af1fe0 84083a80 dd20: 828215f0 00000000 00000000 829d23cc 8407f3c0 8407f404 ea4ddd90 8407f3c0 dd40: 00000000 82b25910 ea4ddd8c ea4ddd58 813cad9c 813dbdf4 20000180 00000000 dd60: ea4ddd7c 20000180 8407f3c0 b5403587 20000180 85e29800 40946400 00000003 dd80: ea4dde4c ea4ddd90 813c68e8 813caca0 35353238 00000000 00000000 00000000 dda0: 00000000 000000a4 01000405 0000000c 00000401 00000006 00000cc7 00000fff ddc0: 5c952395 00000003 000003fe 00000802 00001600 00000001 00000001 00000009 dde0: 0000e1cb 00000006 00000004 00000003 00000400 80000089 fffffffd 00000032 de00: 00003562 ffffeadb 00000001 0000003d 00000008 00000877 00000003 00002ec0 de20: 00000000 9d677a81 00000000 85d1a180 8407f3c0 20000180 20000180 85e29800 de40: ea4ddf14 ea4dde50 813c78b4 813c67f4 00000000 00000000 00000000 9d677a81 de60: 00000000 00000000 824625b4 0000005f 83c55de0 8407f3f0 8409c48c 85e29800 de80: ea4ddee4 ea4dde90 807a7d9c 8079e194 00000064 00000001 00000000 ea4ddeac dea0: 858ae850 834e1b28 00006400 0000000b ea4ddea0 00000000 00000000 9d677a81 dec0: 85d1a180 40946400 20000180 20000180 85d1a180 00000003 ea4ddef4 ea4ddee8 dee0: 807a7ebc 9d677a81 ea4ddf14 40946400 00000000 85d1a181 20000180 85d1a180 df00: 00000003 85e29800 ea4ddfa4 ea4ddf18 80578f00 813c72e4 ecac8b10 85e29800 df20: ea4ddf3c ea4ddf30 81a61720 81a615f0 ea4ddf54 ea4ddf40 8025c484 8028d914 df40: ea4ddfb0 40000000 ea4ddf84 ea4ddf58 802229ec 8025c440 00000000 8281cfb4 df60: ea4ddfb0 0014ced0 ecac8b10 80222940 00000000 9d677a81 ea4ddfac 00000000 df80: 00000000 00316308 00000036 8020029c 85e29800 00000036 00000000 ea4ddfa8 dfa0: 80200060 80578ddc 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fc90bc dfe0: 76fc8ec0 76fc8eb0 00019294 00132970 60000010 00000003 00000000 00000000 Call trace: [<813dbbb8>] (subdev_8255_io) from [<813db8f0>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:000000a4 r6:000000a4 r5:8407f3c0 r4:813dbbb8 [<813db898>] (subdev_8255_do_config) from [<813dbcb0>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813db898>] (subdev_8255_do_config) from [<813dbcb0>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:8585a000 [<813dbc24>] (subdev_8255_io_init) from [<813dbea4>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813dbc24>] (subdev_8255_io_init) from [<813dbea4>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:000000a4 r6:ea4ddda4 r5:8407f3c0 r4:8585a000 [<813dbde8>] (dev_8255_attach) from [<813cad9c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:8407f3c0 r7:ea4ddd90 r6:8407f404 r5:8407f3c0 r4:829d23cc [<813cac94>] (comedi_device_attach) from [<813c68e8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85e29800 r7:20000180 r6:b5403587 r5:8407f3c0 r4:20000180 [<813c67e8>] (do_devconfig_ioctl) from [<813c78b4>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:85e29800 r7:20000180 r6:20000180 r5:8407f3c0 r4:85d1a180 [<813c72d8>] (comedi_unlocked_ioctl) from [<80578f00>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c72d8>] (comedi_unlocked_ioctl) from [<80578f00>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c72d8>] (comedi_unlocked_ioctl) from [<80578f00>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c72d8>] (comedi_unlocked_ioctl) from [<80578f00>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85e29800 r9:00000003 r8:85d1a180 r7:20000180 r6:85d1a181 r5:00000000 r4:40946400 [<80578dd0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea4ddfa8 to 0xea4ddff0) dfa0: 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fc90bc dfe0: 76fc8ec0 76fc8eb0 00019294 00132970 r10:00000036 r9:85e29800 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