8<--- cut here --- Unable to handle kernel paging request at virtual address fee02003 when write [fee02003] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4822 Comm: syz.1.157 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 : [<8149fca0>] lr : [<8149fc8c>] psr: 60000013 sp : ebd21cb8 ip : ebd21cb8 fp : ebd21cd4 r10: 00002000 r9 : 00000004 r8 : ebd21da4 r7 : 00000000 r6 : 0000009b r5 : 84827780 r4 : 00002003 r3 : 0000009b r2 : fee02003 r1 : 00000001 r0 : 84827780 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 866b9600 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84827780 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 84827780 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 0xebd20000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xebd20000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xebd20000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.1.157 (pid: 4822, stack limit = 0xebd20000) Stack: (0xebd21cb8 to 0xebd22000) 1ca0: 8149fc40 00002000 1cc0: 84827780 00000000 ebd21cf4 ebd21cd8 8149f97c 8149fc4c 00002000 80546004 1ce0: 83197000 83197000 ebd21d14 ebd21cf8 8149fd34 8149f930 84827780 00000000 1d00: 83197000 00000000 ebd21d54 ebd21d18 8149fee4 8149fcb8 ffffffff 00000004 1d20: 82a22dc0 00000000 00000000 82bd961c 84827780 00000000 ebd21d90 84827780 1d40: 00000000 82d30dfc ebd21d8c ebd21d58 8148e888 8149fe7c 40946400 00000000 1d60: ebd21d7c 20001a00 84827780 b5403587 40946400 00000003 00000003 85951880 1d80: ebd21e4c ebd21d90 8148a08c 8148e78c 35353238 00000000 00000000 00000000 1da0: 00000000 00002000 00000020 00000004 00000001 00000025 00000200 00000400 1dc0: 00000007 54c6cff3 000000fd 00000005 00000001 52ce292d 00400001 00000009 1de0: 00000005 00000020 0000007f 00000003 40000007 00200089 00000004 000003ff 1e00: 20001e5b 00000003 00000e66 00000003 00000006 00004009 00000000 ffffffff 1e20: 00000000 1f1cb764 00000000 838bd080 84827780 20001a00 40946400 00000003 1e40: ebd21f14 ebd21e50 8148b3b4 81489fcc 00000000 1f1cb764 00000000 00000000 1e60: 8254980c ebd21ea4 0000005f 84906230 00000064 848277b0 ebd21ee4 ebd21e88 1e80: 80806178 807fc3f4 00000064 00000001 00000000 ebd21ea4 848f4710 834e2088 1ea0: 00006400 0000000b ebd21e98 00000000 00000000 1f1cb764 00000000 838bd080 1ec0: 40946400 20001a00 20001a00 838bd080 00000003 85951880 ebd21ef4 ebd21ee8 1ee0: 808062ac 1f1cb764 ebd21f14 00000000 838bd081 40946400 20001a00 838bd080 1f00: 00000003 85951880 ebd21fa4 ebd21f18 805bab18 8148b06c ecac8b10 85951880 1f20: ebd21f3c ebd21f30 81b57660 81b5752c ebd21f54 ebd21f40 8025a7a8 8028e490 1f40: ebd21fb0 40000000 ebd21f84 ebd21f58 80220bdc 8025a764 00000000 82a1eb0c 1f60: ebd21fb0 0013e9c0 ecac8b10 80220b30 00000000 1f1cb764 ebd21fac 00000000 1f80: 00000000 00356310 00000036 8020029c 85951880 00000036 00000000 ebd21fa8 1fa0: 80200060 805ba8e0 00000000 00000000 00000003 40946400 20001a00 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f330dc 1fe0: 76f32e88 76f32e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<8149fc40>] (subdev_8255_io) from [<8149f97c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:84827780 r5:00002000 r4:8149fc40 [<8149f924>] (subdev_8255_do_config) from [<8149fd34>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8149f924>] (subdev_8255_do_config) from [<8149fd34>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:83197000 [<8149fcac>] (subdev_8255_io_init) from [<8149fee4>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8149fcac>] (subdev_8255_io_init) from [<8149fee4>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:83197000 r5:00000000 r4:84827780 [<8149fe70>] (dev_8255_attach) from [<8148e888>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:84827780 r7:ebd21d90 r6:00000000 r5:84827780 r4:82bd961c [<8148e780>] (comedi_device_attach) from [<8148a08c>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:85951880 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:84827780 r4:20001a00 [<81489fc0>] (do_devconfig_ioctl) from [<8148b3b4>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20001a00 r5:84827780 r4:838bd080 [<8148b060>] (comedi_unlocked_ioctl) from [<805bab18>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148b060>] (comedi_unlocked_ioctl) from [<805bab18>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148b060>] (comedi_unlocked_ioctl) from [<805bab18>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148b060>] (comedi_unlocked_ioctl) from [<805bab18>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:85951880 r9:00000003 r8:838bd080 r7:20001a00 r6:40946400 r5:838bd081 r4:00000000 [<805ba8d4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xebd21fa8 to 0xebd21ff0) 1fa0: 00000000 00000000 00000003 40946400 20001a00 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f330dc 1fe0: 76f32e88 76f32e78 00018ebc 00130820 r10:00000036 r9:85951880 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