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: 11478 Comm: syz.9.1339 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 : [<81556950>] lr : [<8155693c>] psr: 60000013 sp : dfdadcb8 ip : dfdadcb8 fp : dfdadcd4 r10: 00000100 r9 : 00000004 r8 : dfdadda4 r7 : 00000000 r6 : 0000009b r5 : 84e34000 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 84e34000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 87a4ac40 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84e34000 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:974 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 84e34000 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 0xdfdac000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2784 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfdac000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2784 Register r12 information: 2-page vmalloc region starting at 0xdfdac000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2784 Process syz.9.1339 (pid: 11478, stack limit = 0xdfdac000) Stack: (0xdfdadcb8 to 0xdfdae000) dca0: 815568f0 00000100 dcc0: 84e34000 00000000 dfdadcf4 dfdadcd8 8155662c 815568fc 00000100 80578500 dce0: 86c5d000 86c5d000 dfdadd14 dfdadcf8 815569e4 815565e0 84e34000 00000000 dd00: 86c5d000 00000000 dfdadd54 dfdadd18 81556b94 81556968 ffffffff 00000004 dd20: 8341e340 00000000 00000000 835dfbe8 84e34000 00000000 dfdadd90 84e34000 dd40: 00000000 83736fe0 dfdadd8c dfdadd58 8154558c 81556b2c 40946400 00000000 dd60: dfdadd7c 20000000 84e34000 b5403587 40946400 00000000 00000003 84c48000 dd80: dfdade4c dfdadd90 81540da8 81545490 35353238 00000000 00000000 00000000 dda0: 00000000 00000100 00004005 00000300 000000e1 0000000e 00000001 00000069 ddc0: 00010000 00000003 00000000 20000009 00000005 00000007 00000001 00000001 dde0: 000000fd 00000000 000107ff 00000002 00000004 00000089 000007ff 00080000 de00: 20001e58 000007ff 0000f39d 00000009 00000008 0001a4b5 00000000 fffffff8 de20: 00000000 fb1bb2f8 00000000 86436880 84e34000 20000000 40946400 00000000 de40: dfdadf14 dfdade50 815420b8 81540ce8 8276ba64 84e80058 00000064 84efd3b4 de60: dfdadee4 dfdade70 8085ca54 80852db4 00000064 84e34030 00000000 dfdade90 de80: 00000000 8899c410 84024110 40946400 0000000b 00000000 dfdade84 00000000 dea0: 00000000 00000000 00000000 00000000 00000000 fb1bb2f8 00000000 86436880 dec0: 40946400 20000000 20000000 86436880 00000003 84c48000 dfdadef4 dfdadee8 dee0: 8085cb84 fb1bb2f8 dfdadf14 00000000 86436881 40946400 20000000 86436880 df00: 00000003 84c48000 dfdadfa4 dfdadf18 805f2e84 81541d70 ecac8b10 84c48000 df20: dfdadf3c dfdadf30 81c0b314 81c0b1e0 dfdadf54 dfdadf40 8025cbac 80292458 df40: dfdadfb0 40000000 dfdadf84 dfdadf58 80222bfc 8025cb64 00000000 8341a10c df60: dfdadfb0 0013ee90 ecac8b10 80222b50 00000000 fb1bb2f8 dfdadfac 00000000 df80: 00000000 00356310 00000036 8020029c 84c48000 00000036 00000000 dfdadfa8 dfa0: 80200060 805f2c4c 00000000 00000000 00000003 40946400 20000000 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f900dc dfe0: 76f8fe88 76f8fe78 0001903c 00130cf0 60000010 00000003 00000000 00000000 Call trace: [<815568f0>] (subdev_8255_io) from [<8155662c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:84e34000 r5:00000100 r4:815568f0 [<815565d4>] (subdev_8255_do_config) from [<815569e4>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<815565d4>] (subdev_8255_do_config) from [<815569e4>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86c5d000 [<8155695c>] (subdev_8255_io_init) from [<81556b94>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8155695c>] (subdev_8255_io_init) from [<81556b94>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:86c5d000 r5:00000000 r4:84e34000 [<81556b20>] (dev_8255_attach) from [<8154558c>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:83736fe0 r9:00000000 r8:84e34000 r7:dfdadd90 r6:00000000 r5:84e34000 r4:835dfbe8 [<81545484>] (comedi_device_attach) from [<81540da8>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:931) r10:84c48000 r9:00000003 r8:00000000 r7:40946400 r6:b5403587 r5:84e34000 r4:20000000 [<81540cdc>] (do_devconfig_ioctl) from [<815420b8>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2303) r8:00000000 r7:40946400 r6:20000000 r5:84e34000 r4:86436880 [<81541d64>] (comedi_unlocked_ioctl) from [<805f2e84>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81541d64>] (comedi_unlocked_ioctl) from [<805f2e84>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81541d64>] (comedi_unlocked_ioctl) from [<805f2e84>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81541d64>] (comedi_unlocked_ioctl) from [<805f2e84>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84c48000 r9:00000003 r8:86436880 r7:20000000 r6:40946400 r5:86436881 r4:00000000 [<805f2c40>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfdadfa8 to 0xdfdadff0) dfa0: 00000000 00000000 00000003 40946400 20000000 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f900dc dfe0: 76f8fe88 76f8fe78 0001903c 00130cf0 r10:00000036 r9:84c48000 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