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: 8294 Comm: syz.2.1033 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: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 : [<814162b4>] lr : [<814162a0>] psr: 60000013 sp : dfc35cb0 ip : dfc35cb0 fp : dfc35ccc r10: 00000001 r9 : 00000084 r8 : dfc35d9c r7 : 00004f27 r6 : 0000009b r5 : 8444c840 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8444c840 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86182f00 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8444c840 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 8444c840 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: 2-page vmalloc region starting at 0xdfc34000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfc34000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfc34000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.2.1033 (pid: 8294, stack limit = 0xdfc34000) Stack: (0xdfc35cb0 to 0xdfc36000) 5ca0: 81416254 8444c840 00004f27 00004f27 5cc0: dfc35cec dfc35cd0 81415f8c 81416260 00004f27 805150ac 84bc2c00 84bc2c00 5ce0: dfc35d0c dfc35cf0 8141634c 81415f40 8444c840 00000000 84bc2c00 00004f27 5d00: dfc35d4c dfc35d10 814164f8 814162cc 8280cc60 83385d00 828217b0 00000000 5d20: 00000000 829d46a0 8444c840 8444c884 dfc35d88 8444c840 00000000 82b28ad8 5d40: dfc35d84 dfc35d50 8140502c 81416490 8444c870 00000000 dfc35d74 20000180 5d60: 8444c840 b5403587 8444c870 83e63c00 40946400 00000003 dfc35e44 dfc35d88 5d80: 81400984 81404f30 35353238 00000000 00000000 00000000 00000000 00004f27 5da0: 0000000a 00000005 00000016 00000005 00000005 00000006 00000000 0000000e 5dc0: 000000fd 7fffffff ffffffff 00000000 00000001 00000004 00000005 fffffffe 5de0: 00009390 00000000 40000003 00000089 00000003 00000080 20001e58 00000008 5e00: 00000006 00000003 0995d000 00000000 00000d77 00000002 00000000 6b72883b 5e20: 00000000 86059840 8444c840 20000180 8444c870 83e63c00 dfc35f14 dfc35e48 5e40: 81401978 81400890 00000000 00000000 00000000 00000000 00000000 6b72883b 5e60: 00000000 00000000 824a45ec 0000005f 83f52a30 00000064 8447e5f4 83e63c00 5e80: dfc35ee4 dfc35e90 807b8180 807ae6a4 00000064 00000001 00000000 dfc35eac 5ea0: 8609a190 834d52a8 00006400 0000000b dfc35ea0 00000000 00000000 6b72883b 5ec0: 86059840 40946400 20000180 20000180 86059840 00000003 dfc35ef4 dfc35ee8 5ee0: 807b82a0 6b72883b dfc35f14 40946400 00000000 86059841 20000180 86059840 5f00: 00000003 83e63c00 dfc35fa4 dfc35f18 80585768 814013c8 ecac8b10 83e63c00 5f20: dfc35f3c dfc35f30 81ab01ac 81ab007c dfc35f54 dfc35f40 8025bcbc 8028e0c4 5f40: dfc35fb0 40000000 dfc35f84 dfc35f58 80221a38 8025bc78 00000000 8281d17c 5f60: dfc35fb0 0014c8c0 ecac8b10 8022198c 00000000 6b72883b dfc35fac 00000000 5f80: 00000000 00326310 00000036 8020029c 83e63c00 00000036 00000000 dfc35fa8 5fa0: 80200060 80585644 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76fdd0bc 5fe0: 76fdcec0 76fdceb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<81416254>] (subdev_8255_io) from [<81415f8c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:8444c840 r4:81416254 [<81415f34>] (subdev_8255_do_config) from [<8141634c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81415f34>] (subdev_8255_do_config) from [<8141634c>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:84bc2c00 [<814162c0>] (subdev_8255_io_init) from [<814164f8>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<814162c0>] (subdev_8255_io_init) from [<814164f8>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:84bc2c00 r5:00000000 r4:8444c840 [<81416484>] (dev_8255_attach) from [<8140502c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:8444c840 r7:dfc35d88 r6:8444c884 r5:8444c840 r4:829d46a0 [<81404f24>] (comedi_device_attach) from [<81400984>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:83e63c00 r7:8444c870 r6:b5403587 r5:8444c840 r4:20000180 [<81400884>] (do_devconfig_ioctl) from [<81401978>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:83e63c00 r7:8444c870 r6:20000180 r5:8444c840 r4:86059840 [<814013bc>] (comedi_unlocked_ioctl) from [<80585768>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814013bc>] (comedi_unlocked_ioctl) from [<80585768>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814013bc>] (comedi_unlocked_ioctl) from [<80585768>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814013bc>] (comedi_unlocked_ioctl) from [<80585768>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83e63c00 r9:00000003 r8:86059840 r7:20000180 r6:86059841 r5:00000000 r4:40946400 [<80585638>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc35fa8 to 0xdfc35ff0) 5fa0: 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76fdd0bc 5fe0: 76fdcec0 76fdceb0 000192bc 00132360 r10:00000036 r9:83e63c00 r8:8020029c r7:00000036 r6:00326310 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