8<--- cut here --- Unable to handle kernel paging request at virtual address fee02f03 when write [fee02f03] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 12461 Comm: syz.8.1413 Not tainted syzkaller #0 PREEMPT 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 : [<814ad81c>] lr : [<814ad808>] psr: 60000013 sp : ea795cb8 ip : ea795cb8 fp : ea795cd4 r10: 00002f00 r9 : 00000004 r8 : ea795da4 r7 : 00000000 r6 : 0000009b r5 : 8394e180 r4 : 00002f03 r3 : 0000009b r2 : fee02f03 r1 : 00000001 r0 : 8394e180 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 87084380 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8394e180 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 8394e180 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 0xea794000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xea794000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Register r12 information: 2-page vmalloc region starting at 0xea794000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Process syz.8.1413 (pid: 12461, stack limit = 0xea794000) Stack: (0xea795cb8 to 0xea796000) 5ca0: 814ad7bc 00002f00 5cc0: 8394e180 00000000 ea795cf4 ea795cd8 814ad4f8 814ad7c8 00002f00 80547798 5ce0: 884ea300 884ea300 ea795d14 ea795cf8 814ad8b0 814ad4ac 8394e180 00000000 5d00: 884ea300 00000000 ea795d54 ea795d18 814ada60 814ad834 ffffffff 00000004 5d20: 82a22dc0 00000000 00000000 82bdac60 8394e180 00000000 ea795d90 8394e180 5d40: 00000000 82d32f9c ea795d8c ea795d58 8149c3e8 814ad9f8 40946400 00000000 5d60: ea795d7c 20000440 8394e180 b5403587 40946400 00000000 00000003 83323d40 5d80: ea795e4c ea795d90 81497bec 8149c2ec 35353238 00000000 00000000 00000000 5da0: 00000000 00002f00 00000000 00000a1a 00000004 00000006 0800afa3 00000000 5dc0: 00000004 00005855 00000002 00000007 00000009 00000001 00000009 00000006 5de0: 00000002 00006f48 00000004 00000002 00100000 00000005 0000caa2 00001003 5e00: 20001e5b 02000003 00000e69 00000002 00000004 00004086 00000000 000006f5 5e20: 00000000 ce1324fb 00000000 87068380 8394e180 20000440 40946400 00000000 5e40: ea795f14 ea795e50 81498f14 81497b2c 00000000 ce1324fb 00000000 00000000 5e60: 8254e844 ea795ea4 0000005f 8420c058 00000064 8394e1b0 ea795ee4 ea795e88 5e80: 8080b76c 80801e24 00000064 00000001 00000000 ea795ea4 8639ea10 834eb000 5ea0: 00006400 0000000b ea795e98 00000000 00000000 ce1324fb 00000000 87068380 5ec0: 40946400 20000440 20000440 87068380 00000003 83323d40 ea795ef4 ea795ee8 5ee0: 8080b8a0 ce1324fb ea795f14 00000000 87068381 40946400 20000440 87068380 5f00: 00000003 83323d40 ea795fa4 ea795f18 805bdf78 81498bcc ecac8b10 83323d40 5f20: ea795f3c ea795f30 81b6ec00 81b6eacc ea795f54 ea795f40 8025b878 8028f548 5f40: ea795fb0 40000000 ea795f84 ea795f58 80221bdc 8025b834 00000000 82a1eb0c 5f60: ea795fb0 0013ebf0 ecac8b10 80221b30 00000000 ce1324fb ea795fac 00000000 5f80: 00000000 00356310 00000036 8020029c 83323d40 00000036 00000000 ea795fa8 5fa0: 80200060 805bdd40 00000000 00000000 00000003 40946400 20000440 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f630dc 5fe0: 76f62e88 76f62e78 00018fa0 00130a50 60000010 00000003 00000000 00000000 Call trace: [<814ad7bc>] (subdev_8255_io) from [<814ad4f8>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8394e180 r5:00002f00 r4:814ad7bc [<814ad4a0>] (subdev_8255_do_config) from [<814ad8b0>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814ad4a0>] (subdev_8255_do_config) from [<814ad8b0>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:884ea300 [<814ad828>] (subdev_8255_io_init) from [<814ada60>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814ad828>] (subdev_8255_io_init) from [<814ada60>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:884ea300 r5:00000000 r4:8394e180 [<814ad9ec>] (dev_8255_attach) from [<8149c3e8>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d32f9c r9:00000000 r8:8394e180 r7:ea795d90 r6:00000000 r5:8394e180 r4:82bdac60 [<8149c2e0>] (comedi_device_attach) from [<81497bec>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:83323d40 r9:00000003 r8:00000000 r7:40946400 r6:b5403587 r5:8394e180 r4:20000440 [<81497b20>] (do_devconfig_ioctl) from [<81498f14>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000000 r7:40946400 r6:20000440 r5:8394e180 r4:87068380 [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83323d40 r9:00000003 r8:87068380 r7:20000440 r6:40946400 r5:87068381 r4:00000000 [<805bdd34>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea795fa8 to 0xea795ff0) 5fa0: 00000000 00000000 00000003 40946400 20000440 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f630dc 5fe0: 76f62e88 76f62e78 00018fa0 00130a50 r10:00000036 r9:83323d40 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