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: 12409 Comm: syz.3.2100 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 : [<813dbb18>] lr : [<813dbb04>] psr: 60000013 sp : ead19cb8 ip : ead19cb8 fp : ead19cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 8380ff00 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8380ff00 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 860d9b00 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8380ff00 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 8380ff00 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 0xead18000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xead18000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.3.2100 (pid: 12409, stack limit = 0xead18000) Stack: (0xead19cb8 to 0xead1a000) 9ca0: 813dbab8 8380ff00 9cc0: 00004f27 00004f27 ead19cf4 ead19cd8 813db7f0 813dbac4 00004f27 8050a7fc 9ce0: 84902800 84902800 ead19d14 ead19cf8 813dbbb0 813db7a4 84902800 8380ff00 9d00: ead19da4 00004f27 ead19d54 ead19d18 813dbda4 813dbb30 8079dfdc 8390f100 9d20: 828215f0 00000000 00000000 829d23cc 8380ff00 8380ff44 ead19d90 8380ff00 9d40: 00000000 82b25910 ead19d8c ead19d58 813cac9c 813dbcf4 200000c0 00000000 9d60: ead19d7c 200000c0 8380ff00 b5403587 200000c0 83970000 40946400 00000003 9d80: ead19e4c ead19d90 813c67e8 813caba0 35353238 00000000 00000000 00000000 9da0: 00000000 00004f27 00000005 00000002 00000401 00000021 00000cc7 00000fff 9dc0: 5c952399 00000005 000003ff 00000802 00000005 00000001 00000000 00000009 9de0: 0000e1cb 00000006 00000004 00000003 00000395 80000089 fffffffd 00000000 9e00: 00000006 ffffeadb 00000003 0001003c 00000008 80000001 08000000 00000005 9e20: 00000000 65d02b31 00000000 8619f900 8380ff00 200000c0 200000c0 83970000 9e40: ead19f14 ead19e50 813c77b4 813c66f4 00000000 ead19e54 ead19e54 65d02b31 9e60: 00000000 00000000 824625b4 0000005f 83db5408 8380ff30 83813d8c 83970000 9e80: ead19ee4 ead19e90 807a7d9c 8079e194 00000064 00000001 00000000 ead19eac 9ea0: 857abd90 83426440 00006400 0000000b ead19ea0 00000000 ead19d30 65d02b31 9ec0: 8619f900 40946400 200000c0 200000c0 8619f900 00000003 ead19ef4 ead19ee8 9ee0: 807a7ebc 65d02b31 ead19f14 40946400 00000000 8619f901 200000c0 8619f900 9f00: 00000003 83970000 ead19fa4 ead19f18 80578f00 813c71e4 ecac8b10 83970000 9f20: ead19f3c ead19f30 81a61300 81a611d0 ead19f54 ead19f40 8025c484 8028d914 9f40: ead19fb0 40000000 ead19f84 ead19f58 802229ec 8025c440 00000000 8281cfb4 9f60: ead19fb0 0014ced0 ecac8b10 80222940 00000000 65d02b31 ead19fac 00000000 9f80: 00000000 00316308 00000036 8020029c 83970000 00000036 00000000 ead19fa8 9fa0: 80200060 80578ddc 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f7e0bc 9fe0: 76f7dec0 76f7deb0 00019294 00132970 60000010 00000003 00000000 00000000 Call trace: [<813dbab8>] (subdev_8255_io) from [<813db7f0>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:8380ff00 r4:813dbab8 [<813db798>] (subdev_8255_do_config) from [<813dbbb0>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813db798>] (subdev_8255_do_config) from [<813dbbb0>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:84902800 [<813dbb24>] (subdev_8255_io_init) from [<813dbda4>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813dbb24>] (subdev_8255_io_init) from [<813dbda4>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:ead19da4 r5:8380ff00 r4:84902800 [<813dbce8>] (dev_8255_attach) from [<813cac9c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:8380ff00 r7:ead19d90 r6:8380ff44 r5:8380ff00 r4:829d23cc [<813cab94>] (comedi_device_attach) from [<813c67e8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83970000 r7:200000c0 r6:b5403587 r5:8380ff00 r4:200000c0 [<813c66e8>] (do_devconfig_ioctl) from [<813c77b4>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83970000 r7:200000c0 r6:200000c0 r5:8380ff00 r4:8619f900 [<813c71d8>] (comedi_unlocked_ioctl) from [<80578f00>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c71d8>] (comedi_unlocked_ioctl) from [<80578f00>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c71d8>] (comedi_unlocked_ioctl) from [<80578f00>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c71d8>] (comedi_unlocked_ioctl) from [<80578f00>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83970000 r9:00000003 r8:8619f900 r7:200000c0 r6:8619f901 r5:00000000 r4:40946400 [<80578dd0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xead19fa8 to 0xead19ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f7e0bc 9fe0: 76f7dec0 76f7deb0 00019294 00132970 r10:00000036 r9:83970000 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