8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f23 when write [fee04f23] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4387 Comm: syz.0.239 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 parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<81408a90>] lr : [<81408a80>] psr: 60000013 sp : dfa91d28 ip : dfa91d28 fp : dfa91d4c r10: 82b28ad8 r9 : 00000003 r8 : 8449d900 r7 : dfa91d88 r6 : 8449d900 r5 : 00000000 r4 : 00000000 r3 : fee04f23 r2 : 81e1a2b8 r1 : 00000001 r0 : 81408700 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 87414c40 DAC: 00000000 Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 8449d900 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa90000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 8449d900 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdfa90000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfa90000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.0.239 (pid: 4387, stack limit = 0xdfa90000) Stack: (0xdfa91d28 to 0xdfa92000) 1d20: 82432cf4 8449d900 829d3f08 829d3f08 81e1a778 8449d944 1d40: dfa91d84 dfa91d50 81404738 81408928 8449d930 00000000 dfa91d74 200000c0 1d60: 8449d900 b5403587 8449d930 83f06000 40946400 00000003 dfa91e44 dfa91d88 1d80: 81400090 8140463c 656d6f63 705f6964 6f707261 00007472 00000000 00004f23 1da0: 00000005 00000002 04000401 00000001 40000cc7 00000fff 5c952399 00000005 1dc0: 000003ff 00000802 00000008 00010001 00000001 00000009 0000e1cb 00000006 1de0: 00000401 00000003 00000395 80000089 fffffffd 00000032 fffffff5 ffffeadb 1e00: 00000007 0000003c 00000008 00000003 08000000 00002ec0 00000000 01cc1e28 1e20: 00000000 84c54300 8449d900 200000c0 8449d930 83f06000 dfa91f14 dfa91e48 1e40: 81401084 813fff9c 00000000 00000000 00000000 00000000 00000000 01cc1e28 1e60: 00000000 00000000 824a35ec 0000005f 845f7018 00000064 844da51c 83f06000 1e80: dfa91ee4 dfa91e90 807b7e58 807ae37c 00000064 00000001 00000000 dfa91eac 1ea0: 84c4fa90 834f44c8 00006400 0000000b dfa91ea0 00000000 00000000 01cc1e28 1ec0: 84c54300 40946400 200000c0 200000c0 84c54300 00000003 dfa91ef4 dfa91ee8 1ee0: 807b7f78 01cc1e28 dfa91f14 40946400 00000000 84c54301 200000c0 84c54300 1f00: 00000003 83f06000 dfa91fa4 dfa91f18 805855f0 81400ad4 dfa91f3c dfa91f28 1f20: 8025bc64 8022787c 83f06000 00000001 dfa91f54 dfa91f40 8025bcbc 8028e0c4 1f40: dfa91fb0 40000000 dfa91f84 dfa91f58 80221a38 8025bc78 00000000 8281d17c 1f60: dfa91fb0 0014c880 ecac8b10 8022198c 00000000 01cc1e28 dfa91fac 00000000 1f80: 00000000 00316310 00000036 8020029c 83f06000 00000036 00000000 dfa91fa8 1fa0: 80200060 805854cc 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76fd00bc 1fe0: 76fcfec0 76fcfeb0 0001929c 00132320 60000010 00000003 00000000 00000000 Call trace: [<8140891c>] (parport_attach) from [<81404738>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:8449d944 r5:81e1a778 r4:829d3f08 [<81404630>] (comedi_device_attach) from [<81400090>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:83f06000 r7:8449d930 r6:b5403587 r5:8449d900 r4:200000c0 [<813fff90>] (do_devconfig_ioctl) from [<81401084>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:83f06000 r7:8449d930 r6:200000c0 r5:8449d900 r4:84c54300 [<81400ac8>] (comedi_unlocked_ioctl) from [<805855f0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400ac8>] (comedi_unlocked_ioctl) from [<805855f0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400ac8>] (comedi_unlocked_ioctl) from [<805855f0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400ac8>] (comedi_unlocked_ioctl) from [<805855f0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83f06000 r9:00000003 r8:84c54300 r7:200000c0 r6:84c54301 r5:00000000 r4:40946400 [<805854c0>] (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 200000c0 00000000 1fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76fd00bc 1fe0: 76fcfec0 76fcfeb0 0001929c 00132320 r10:00000036 r9:83f06000 r8:8020029c r7:00000036 r6:00316310 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction