8<--- cut here --- Unable to handle kernel paging request at virtual address fee09003 when write [fee09003] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6676 Comm: syz.1.744 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 : [<81468a58>] lr : [<81468a44>] psr: 60000013 sp : df9d1cb8 ip : df9d1cb8 fp : df9d1cd4 r10: 00009000 r9 : 00000004 r8 : df9d1da4 r7 : 00000000 r6 : 0000009b r5 : 8467d780 r4 : 00009003 r3 : 0000009b r2 : fee09003 r1 : 00000001 r0 : 8467d780 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8612e5c0 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8467d780 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 8467d780 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 0xdf9d0000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdf9d0000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r12 information: 2-page vmalloc region starting at 0xdf9d0000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Process syz.1.744 (pid: 6676, stack limit = 0xdf9d0000) Stack: (0xdf9d1cb8 to 0xdf9d2000) 1ca0: 814689f8 00009000 1cc0: 8467d780 00000000 df9d1cf4 df9d1cd8 81468734 81468a04 00009000 805329dc 1ce0: 850f4540 850f4540 df9d1d14 df9d1cf8 81468aec 814686e8 8467d780 00000000 1d00: 850f4540 00000000 df9d1d54 df9d1d18 81468c9c 81468a70 ffffffff 00000004 1d20: 82a20900 00000000 00000000 82bd2b24 8467d780 00000000 df9d1d90 8467d780 1d40: 00000000 82d29754 df9d1d8c df9d1d58 81457640 81468c34 40946400 00000000 1d60: df9d1d7c 20000140 8467d780 b5403587 40946400 00000001 00000005 84818000 1d80: df9d1e4c df9d1d90 81452e4c 81457544 35353238 00000000 00000000 00000000 1da0: 00000000 00009000 00000000 00000a1a 00000004 00000004 0800afa3 00000004 1dc0: 00000008 00005857 00000002 00000007 00000009 00000001 00000005 00000006 1de0: 00000501 00000000 00000004 00000002 0000000a 00000008 0000caa2 00001003 1e00: 20001e5b 02000003 00000e69 00000002 00000004 00004086 00000000 00000004 1e20: 00000000 3ec2e5ea 00000000 8655c080 8467d780 20000140 40946400 00000001 1e40: df9d1f14 df9d1e50 81454170 81452d84 00000000 3ec2e5ea 00000000 00000000 1e60: 82531804 df9d1ea4 0000005f 844370f0 00000064 8467d7b0 df9d1ee4 df9d1e88 1e80: 807eaa84 807e0d98 00000064 00000001 00000000 df9d1ea4 830ea010 834334c8 1ea0: 00006400 0000000b df9d1e98 00000000 00000000 3ec2e5ea 00000000 8655c080 1ec0: 40946400 20000140 20000140 8655c080 00000005 84818000 df9d1ef4 df9d1ee8 1ee0: 807eabb8 3ec2e5ea df9d1f14 00000000 8655c081 40946400 20000140 8655c080 1f00: 00000005 84818000 df9d1fa4 df9d1f18 805a2310 81453e28 ecac8b10 84818000 1f20: df9d1f3c df9d1f30 81b1b854 81b1b720 df9d1f54 df9d1f40 8025a6ac 8028e2e4 1f40: df9d1fb0 40000000 df9d1f84 df9d1f58 80220be0 8025a668 00000000 82a1c63c 1f60: df9d1fb0 0013e9b0 ecac8b10 80220b34 00000000 3ec2e5ea df9d1fac 00000000 1f80: 00000000 00346450 00000036 8020029c 84818000 00000036 00000000 df9d1fa8 1fa0: 80200060 805a20d8 00000000 00000000 00000005 40946400 20000140 00000000 1fc0: 00000000 00000000 00346450 00000036 00346418 00000000 00000001 76f770dc 1fe0: 76f76e88 76f76e78 00018ebc 00130810 60000010 00000005 00000000 00000000 Call trace: [<814689f8>] (subdev_8255_io) from [<81468734>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8467d780 r5:00009000 r4:814689f8 [<814686dc>] (subdev_8255_do_config) from [<81468aec>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814686dc>] (subdev_8255_do_config) from [<81468aec>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:850f4540 [<81468a64>] (subdev_8255_io_init) from [<81468c9c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<81468a64>] (subdev_8255_io_init) from [<81468c9c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:850f4540 r5:00000000 r4:8467d780 [<81468c28>] (dev_8255_attach) from [<81457640>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d29754 r9:00000000 r8:8467d780 r7:df9d1d90 r6:00000000 r5:8467d780 r4:82bd2b24 [<81457538>] (comedi_device_attach) from [<81452e4c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:84818000 r9:00000005 r8:00000001 r7:40946400 r6:b5403587 r5:8467d780 r4:20000140 [<81452d78>] (do_devconfig_ioctl) from [<81454170>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000140 r5:8467d780 r4:8655c080 [<81453e1c>] (comedi_unlocked_ioctl) from [<805a2310>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81453e1c>] (comedi_unlocked_ioctl) from [<805a2310>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81453e1c>] (comedi_unlocked_ioctl) from [<805a2310>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81453e1c>] (comedi_unlocked_ioctl) from [<805a2310>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84818000 r9:00000005 r8:8655c080 r7:20000140 r6:40946400 r5:8655c081 r4:00000000 [<805a20cc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9d1fa8 to 0xdf9d1ff0) 1fa0: 00000000 00000000 00000005 40946400 20000140 00000000 1fc0: 00000000 00000000 00346450 00000036 00346418 00000000 00000001 76f770dc 1fe0: 76f76e88 76f76e78 00018ebc 00130810 r10:00000036 r9:84818000 r8:8020029c r7:00000036 r6:00346450 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