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: 4699 Comm: syz.2.84 Not tainted syzkaller #0 PREEMPT 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 : [<8149e318>] lr : [<8149e304>] psr: 60000013 sp : dfab5cb8 ip : dfab5cb8 fp : dfab5cd4 r10: 00000100 r9 : 00000004 r8 : dfab5da4 r7 : 00000000 r6 : 0000009b r5 : 84298780 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 84298780 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8614e8c0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84298780 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 84298780 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 0xdfab4000 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 0xdfab4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Register r12 information: 2-page vmalloc region starting at 0xdfab4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Process syz.2.84 (pid: 4699, stack limit = 0xdfab4000) Stack: (0xdfab5cb8 to 0xdfab6000) 5ca0: 8149e2b8 00000100 5cc0: 84298780 00000000 dfab5cf4 dfab5cd8 8149dff4 8149e2c4 00000100 80545dc8 5ce0: 861ed400 861ed400 dfab5d14 dfab5cf8 8149e3ac 8149dfa8 84298780 00000000 5d00: 861ed400 00000000 dfab5d54 dfab5d18 8149e55c 8149e330 ffffffff 00000004 5d20: 82a22dc0 00000000 00000000 82bd9600 84298780 00000000 dfab5d90 84298780 5d40: 00000000 82d30dfc dfab5d8c dfab5d58 8148cefc 8149e4f4 40946400 00000000 5d60: dfab5d7c 20000240 84298780 b5403587 40946400 00000003 00000003 8408a4c0 5d80: dfab5e4c dfab5d90 81488700 8148ce00 35353238 00000000 00000000 00000000 5da0: 00000000 00000100 00000004 00000000 00000002 00000044 000000f3 00000079 5dc0: 00000004 00080008 00000005 00000003 00000064 000000ea 00000001 00080006 5de0: 000000fd 00000006 00000009 00000003 7fffffff 0000b740 0000ca9f 00000009 5e00: 20001e58 00000008 0000f39c 00000003 1539b804 00000005 00000001 00000002 5e20: 00000000 4972f8fd 00000000 85b98b80 84298780 20000240 40946400 00000003 5e40: dfab5f14 dfab5e50 81489a28 81488640 00000000 4972f8fd 00000000 00000000 5e60: 8254880c dfab5ea4 0000005f 843874a0 00000064 842987b0 dfab5ee4 dfab5e88 5e80: 80804fa4 807fb2d4 00000064 00000001 00000000 dfab5ea4 8605a810 8343cb28 5ea0: 00006400 0000000b dfab5e98 00000000 00000000 4972f8fd 00000000 85b98b80 5ec0: 40946400 20000240 20000240 85b98b80 00000003 8408a4c0 dfab5ef4 dfab5ee8 5ee0: 808050d8 4972f8fd dfab5f14 00000000 85b98b81 40946400 20000240 85b98b80 5f00: 00000003 8408a4c0 dfab5fa4 dfab5f18 805ba7a0 814896e0 ecac8b10 8408a4c0 5f20: dfab5f3c dfab5f30 81b54a80 81b5494c dfab5f54 dfab5f40 8025a7ac 8028e488 5f40: dfab5fb0 40000000 dfab5f84 dfab5f58 80220bdc 8025a768 00000000 82a1eb0c 5f60: dfab5fb0 0013e9c0 ecac8b10 80220b30 00000000 4972f8fd dfab5fac 00000000 5f80: 00000000 00356310 00000036 8020029c 8408a4c0 00000036 00000000 dfab5fa8 5fa0: 80200060 805ba568 00000000 00000000 00000003 40946400 20000240 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f470dc 5fe0: 76f46e88 76f46e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<8149e2b8>] (subdev_8255_io) from [<8149dff4>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:84298780 r5:00000100 r4:8149e2b8 [<8149df9c>] (subdev_8255_do_config) from [<8149e3ac>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8149df9c>] (subdev_8255_do_config) from [<8149e3ac>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:861ed400 [<8149e324>] (subdev_8255_io_init) from [<8149e55c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8149e324>] (subdev_8255_io_init) from [<8149e55c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:861ed400 r5:00000000 r4:84298780 [<8149e4e8>] (dev_8255_attach) from [<8148cefc>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:84298780 r7:dfab5d90 r6:00000000 r5:84298780 r4:82bd9600 [<8148cdf4>] (comedi_device_attach) from [<81488700>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:8408a4c0 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:84298780 r4:20000240 [<81488634>] (do_devconfig_ioctl) from [<81489a28>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000240 r5:84298780 r4:85b98b80 [<814896d4>] (comedi_unlocked_ioctl) from [<805ba7a0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814896d4>] (comedi_unlocked_ioctl) from [<805ba7a0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814896d4>] (comedi_unlocked_ioctl) from [<805ba7a0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814896d4>] (comedi_unlocked_ioctl) from [<805ba7a0>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8408a4c0 r9:00000003 r8:85b98b80 r7:20000240 r6:40946400 r5:85b98b81 r4:00000000 [<805ba55c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfab5fa8 to 0xdfab5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000240 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f470dc 5fe0: 76f46e88 76f46e78 00018ebc 00130820 r10:00000036 r9:8408a4c0 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