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: 1 UID: 0 PID: 13587 Comm: syz.1.1383 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 : [<8145a7e0>] lr : [<8145a7cc>] psr: 60000013 sp : dfa91cb8 ip : dfa91cb8 fp : dfa91cd4 r10: 00000100 r9 : 00000004 r8 : dfa91da4 r7 : 00000000 r6 : 0000009b r5 : 847b6d80 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 847b6d80 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8603f640 DAC: 00000000 Register r0 information: slab kmalloc-192 start 847b6d80 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 847b6d80 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 0xdfa90000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfa90000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Register r12 information: 2-page vmalloc region starting at 0xdfa90000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Process syz.1.1383 (pid: 13587, stack limit = 0xdfa90000) Stack: (0xdfa91cb8 to 0xdfa92000) 1ca0: 8145a780 00000100 1cc0: 847b6d80 00000000 dfa91cf4 dfa91cd8 8145a4bc 8145a78c 00000100 8052d00c 1ce0: 870fc000 870fc000 dfa91d14 dfa91cf8 8145a874 8145a470 847b6d80 00000000 1d00: 870fc000 00000000 dfa91d54 dfa91d18 8145aa24 8145a7f8 ffffffff 00000004 1d20: 82a20600 00000000 00000000 82bd2e9c 847b6d80 00000000 dfa91d90 847b6d80 1d40: 00000000 82d2bdc4 dfa91d8c dfa91d58 814493ac 8145a9bc 40946400 00000000 1d60: dfa91d7c 20000180 847b6d80 b5403587 40946400 00000003 00000003 83e155c0 1d80: dfa91e4c dfa91d90 81444bb8 814492b0 35353238 00000000 00000000 00000000 1da0: 00000000 00000100 000003ff 00000001 000023d9 00000002 00000100 00000003 1dc0: 30000001 00000008 0000000a fffffffe 00000007 00000001 00000000 00000009 1de0: fffffffe 00000001 00000003 00000ee9 00000401 00000007 00000002 000001aa 1e00: 00000007 00000005 00000007 00000007 00000007 00000081 00000006 00000008 1e20: 00000000 e7af4dd6 00000000 85a1dd80 847b6d80 20000180 40946400 00000003 1e40: dfa91f14 dfa91e50 81445edc 81444af0 00000000 e7af4dd6 00000000 00000000 1e60: 8252e804 dfa91ea4 0000005f 8470c990 00000064 847b6db0 dfa91ee4 dfa91e88 1e80: 807df054 807d5384 00000064 00000001 00000000 dfa91ea4 868410d0 834ef330 1ea0: 00006400 0000000b dfa91e98 00000000 00000000 e7af4dd6 00000000 85a1dd80 1ec0: 40946400 20000180 20000180 85a1dd80 00000003 83e155c0 dfa91ef4 dfa91ee8 1ee0: 807df188 e7af4dd6 dfa91f14 00000000 85a1dd81 40946400 20000180 85a1dd80 1f00: 00000003 83e155c0 dfa91fa4 dfa91f18 8059c11c 81445b94 ecac8b10 83e155c0 1f20: dfa91f3c dfa91f30 81b05a54 81b05920 dfa91f54 dfa91f40 8025a4dc 8028c2bc 1f40: dfa91fb0 40000000 dfa91f84 dfa91f58 80220be0 8025a498 00000000 82a1c33c 1f60: dfa91fb0 0013e940 ecac8b10 80220b34 00000000 e7af4dd6 dfa91fac 00000000 1f80: 00000000 00346310 00000036 8020029c 83e155c0 00000036 00000000 dfa91fa8 1fa0: 80200060 8059bee4 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f5a0dc 1fe0: 76f59e88 76f59e78 00018e58 001307a0 60000010 00000003 00000000 00000000 Call trace: [<8145a780>] (subdev_8255_io) from [<8145a4bc>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:847b6d80 r5:00000100 r4:8145a780 [<8145a464>] (subdev_8255_do_config) from [<8145a874>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8145a464>] (subdev_8255_do_config) from [<8145a874>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:870fc000 [<8145a7ec>] (subdev_8255_io_init) from [<8145aa24>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8145a7ec>] (subdev_8255_io_init) from [<8145aa24>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:870fc000 r5:00000000 r4:847b6d80 [<8145a9b0>] (dev_8255_attach) from [<814493ac>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2bdc4 r9:00000000 r8:847b6d80 r7:dfa91d90 r6:00000000 r5:847b6d80 r4:82bd2e9c [<814492a4>] (comedi_device_attach) from [<81444bb8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:83e155c0 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:847b6d80 r4:20000180 [<81444ae4>] (do_devconfig_ioctl) from [<81445edc>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:847b6d80 r4:85a1dd80 [<81445b88>] (comedi_unlocked_ioctl) from [<8059c11c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81445b88>] (comedi_unlocked_ioctl) from [<8059c11c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81445b88>] (comedi_unlocked_ioctl) from [<8059c11c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81445b88>] (comedi_unlocked_ioctl) from [<8059c11c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83e155c0 r9:00000003 r8:85a1dd80 r7:20000180 r6:40946400 r5:85a1dd81 r4:00000000 [<8059bed8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa91fa8 to 0xdfa91ff0) 1fa0: 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f5a0dc 1fe0: 76f59e88 76f59e78 00018e58 001307a0 r10:00000036 r9:83e155c0 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