8<--- cut here --- Unable to handle kernel paging request at virtual address fee00103 when write [fee00103] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 9758 Comm: syz.2.1271 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: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 : dfa51cb8 ip : dfa51cb8 fp : dfa51cd4 r10: 00000100 r9 : 00000004 r8 : dfa51da4 r7 : 00000000 r6 : 0000009b r5 : 846a00c0 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 846a00c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86828e80 DAC: fffffffd Register r0 information: slab kmalloc-192 start 846a00c0 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 846a00c0 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 0xdfa50000 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 0xdfa50000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Register r12 information: 2-page vmalloc region starting at 0xdfa50000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Process syz.2.1271 (pid: 9758, stack limit = 0xdfa50000) Stack: (0xdfa51cb8 to 0xdfa52000) 1ca0: 814ad7bc 00000100 1cc0: 846a00c0 00000000 dfa51cf4 dfa51cd8 814ad4f8 814ad7c8 00000100 80547798 1ce0: 86860000 86860000 dfa51d14 dfa51cf8 814ad8b0 814ad4ac 846a00c0 00000000 1d00: 86860000 00000000 dfa51d54 dfa51d18 814ada60 814ad834 ffffffff 00000004 1d20: 82a22dc0 00000000 00000000 82bdac60 846a00c0 00000000 dfa51d90 846a00c0 1d40: 00000000 82d32f9c dfa51d8c dfa51d58 8149c3e8 814ad9f8 40946400 00000000 1d60: dfa51d7c 200000c0 846a00c0 b5403587 40946400 00000003 00000003 841855c0 1d80: dfa51e4c dfa51d90 81497bec 8149c2ec 35353238 00000000 00000000 00000000 1da0: 00000000 00000100 00000008 000000f3 0000000c 00000008 00000005 00000007 1dc0: 00000007 00000003 00000100 00000006 00000006 00000006 80000005 000001ff 1de0: 000000fd fffffffc 00000803 00000010 00000002 00000009 00000000 00000000 1e00: 20001e58 00000003 00000003 00000006 80000008 0000a6b5 00000004 ffffffff 1e20: 00000000 f393a929 00000000 83fca200 846a00c0 200000c0 40946400 00000003 1e40: dfa51f14 dfa51e50 81498f14 81497b2c 00000000 f393a929 00000000 00000000 1e60: 8254e844 dfa51ea4 0000005f 842587b8 00000064 846a00f0 dfa51ee4 dfa51e88 1e80: 8080b76c 80801e24 00000064 00000001 00000000 dfa51ea4 84e91110 8342ba18 1ea0: 00006400 0000000b dfa51e98 00000000 00000000 f393a929 00000000 83fca200 1ec0: 40946400 200000c0 200000c0 83fca200 00000003 841855c0 dfa51ef4 dfa51ee8 1ee0: 8080b8a0 f393a929 dfa51f14 00000000 83fca201 40946400 200000c0 83fca200 1f00: 00000003 841855c0 dfa51fa4 dfa51f18 805bdf78 81498bcc ecac8b10 841855c0 1f20: dfa51f3c dfa51f30 81b6ec00 81b6eacc dfa51f54 dfa51f40 8025b878 8028f548 1f40: dfa51fb0 40000000 dfa51f84 dfa51f58 80221bdc 8025b834 00000000 82a1eb0c 1f60: dfa51fb0 0013ebf0 ecac8b10 80221b30 00000000 f393a929 dfa51fac 00000000 1f80: 00000000 00356310 00000036 8020029c 841855c0 00000036 00000000 dfa51fa8 1fa0: 80200060 805bdd40 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f5e0dc 1fe0: 76f5de88 76f5de78 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 r6:846a00c0 r5:00000100 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) r4:86860000 [<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 r6:86860000 r5:00000000 r4:846a00c0 [<814ad9ec>] (dev_8255_attach) from [<8149c3e8>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d32f9c r9:00000000 r8:846a00c0 r7:dfa51d90 r6:00000000 r5:846a00c0 r4:82bdac60 [<8149c2e0>] (comedi_device_attach) from [<81497bec>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:841855c0 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:846a00c0 r4:200000c0 [<81497b20>] (do_devconfig_ioctl) from [<81498f14>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:200000c0 r5:846a00c0 r4:83fca200 [<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) r10:841855c0 r9:00000003 r8:83fca200 r7:200000c0 r6:40946400 r5:83fca201 r4:00000000 [<805bdd34>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa51fa8 to 0xdfa51ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f5e0dc 1fe0: 76f5de88 76f5de78 00018fa0 00130a50 r10:00000036 r9:841855c0 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