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: 0 UID: 0 PID: 20702 Comm: syz.0.2598 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 : [<8149e358>] lr : [<8149e344>] psr: 60000013 sp : e0251cb8 ip : e0251cb8 fp : e0251cd4 r10: 00009000 r9 : 00000004 r8 : e0251da4 r7 : 00000000 r6 : 0000009b r5 : 842403c0 r4 : 00009003 r3 : 0000009b r2 : fee09003 r1 : 00000001 r0 : 842403c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 87bc0b00 DAC: fffffffd Register r0 information: slab kmalloc-192 start 842403c0 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 842403c0 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 0xe0250000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xe0250000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Register r12 information: 2-page vmalloc region starting at 0xe0250000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Process syz.0.2598 (pid: 20702, stack limit = 0xe0250000) Stack: (0xe0251cb8 to 0xe0252000) 1ca0: 8149e2f8 00009000 1cc0: 842403c0 00000000 e0251cf4 e0251cd8 8149e034 8149e304 00009000 80545e10 1ce0: 855ea000 855ea000 e0251d14 e0251cf8 8149e3ec 8149dfe8 842403c0 00000000 1d00: 855ea000 00000000 e0251d54 e0251d18 8149e59c 8149e370 ffffffff 00000004 1d20: 82a22dc0 00000000 00000000 82bd9600 842403c0 00000000 e0251d90 842403c0 1d40: 00000000 82d30dfc e0251d8c e0251d58 8148cf3c 8149e534 40946400 00000000 1d60: e0251d7c 20000140 842403c0 b5403587 40946400 00000001 00000003 84c88c40 1d80: e0251e4c e0251d90 81488740 8148ce40 35353238 00000000 00000000 00000000 1da0: 00000000 00009000 03900000 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 183f8962 00000000 86f15200 842403c0 20000140 40946400 00000001 1e40: e0251f14 e0251e50 81489a68 81488680 00000000 183f8962 00000000 00000000 1e60: 8254880c e0251ea4 0000005f 8435d850 00000064 842403f0 e0251ee4 e0251e88 1e80: 80804fec 807fb31c 00000064 00000001 00000000 e0251ea4 86019f10 8343d088 1ea0: 00006400 0000000b e0251e98 00000000 00000000 183f8962 00000000 86f15200 1ec0: 40946400 20000140 20000140 86f15200 00000003 84c88c40 e0251ef4 e0251ee8 1ee0: 80805120 183f8962 e0251f14 00000000 86f15201 40946400 20000140 86f15200 1f00: 00000003 84c88c40 e0251fa4 e0251f18 805ba7e8 81489720 ecac8b10 84c88c40 1f20: e0251f3c e0251f30 81b54ac0 81b5498c e0251f54 e0251f40 8025a7ac 8028e488 1f40: e0251fb0 40000000 e0251f84 e0251f58 80220bdc 8025a768 00000000 82a1eb0c 1f60: e0251fb0 0013e9c0 ecac8b10 80220b30 00000000 183f8962 e0251fac 00000000 1f80: 00000000 00346310 00000036 8020029c 84c88c40 00000036 00000000 e0251fa8 1fa0: 80200060 805ba5b0 00000000 00000000 00000003 40946400 20000140 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fae0dc 1fe0: 76fade88 76fade78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<8149e2f8>] (subdev_8255_io) from [<8149e034>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:842403c0 r5:00009000 r4:8149e2f8 [<8149dfdc>] (subdev_8255_do_config) from [<8149e3ec>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8149dfdc>] (subdev_8255_do_config) from [<8149e3ec>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:855ea000 [<8149e364>] (subdev_8255_io_init) from [<8149e59c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8149e364>] (subdev_8255_io_init) from [<8149e59c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:855ea000 r5:00000000 r4:842403c0 [<8149e528>] (dev_8255_attach) from [<8148cf3c>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:842403c0 r7:e0251d90 r6:00000000 r5:842403c0 r4:82bd9600 [<8148ce34>] (comedi_device_attach) from [<81488740>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:84c88c40 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:842403c0 r4:20000140 [<81488674>] (do_devconfig_ioctl) from [<81489a68>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000140 r5:842403c0 r4:86f15200 [<81489714>] (comedi_unlocked_ioctl) from [<805ba7e8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81489714>] (comedi_unlocked_ioctl) from [<805ba7e8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81489714>] (comedi_unlocked_ioctl) from [<805ba7e8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81489714>] (comedi_unlocked_ioctl) from [<805ba7e8>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84c88c40 r9:00000003 r8:86f15200 r7:20000140 r6:40946400 r5:86f15201 r4:00000000 [<805ba5a4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0251fa8 to 0xe0251ff0) 1fa0: 00000000 00000000 00000003 40946400 20000140 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fae0dc 1fe0: 76fade88 76fade78 00018ebc 00130820 r10:00000036 r9:84c88c40 r8:8020029c r7:00000036 r6:00346310 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