8<--- cut here --- Unable to handle kernel paging request at virtual address fee04e27 when write [fee04e27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4581 Comm: syz.1.173 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 : [<814087e8>] lr : [<814087d8>] psr: 60000013 sp : e0265d28 ip : e0265d28 fp : e0265d4c r10: 82b28ad8 r9 : 00000003 r8 : 8445ab40 r7 : e0265d88 r6 : 8445ab40 r5 : 00000000 r4 : 00000000 r3 : fee04e27 r2 : 81e1a338 r1 : 00000001 r0 : 81408458 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8623eb40 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 8445ab40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe0264000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 8445ab40 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 0xe0264000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xe0264000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.1.173 (pid: 4581, stack limit = 0xe0264000) Stack: (0xe0265d28 to 0xe0266000) 5d20: e0265d44 e0265d38 829d3f08 829d3f08 81e1a7f8 8445ab84 5d40: e0265d84 e0265d50 81404490 81408680 8445ab70 00000000 e0265d74 20000440 5d60: 8445ab40 b5403587 8445ab70 84555400 40946400 00000003 e0265e44 e0265d88 5d80: 813ffde8 81404394 656d6f63 705f6964 6f707261 00007472 00000000 00004e27 5da0: 00000000 00000003 7fffffff 000000e7 00000008 00000008 00000a83 0000ff46 5dc0: 00000100 00000cf3 0000000b 00000400 00000a00 00000003 ffffffea 00010001 5de0: 00010087 80000000 00000000 00000002 00000001 00000f24 02000007 0000000b 5e00: 00000bfd 0000003c 00000004 00000006 00000000 80000000 00000000 cb811902 5e20: 00000000 85afe240 8445ab40 20000440 8445ab70 84555400 e0265f14 e0265e48 5e40: 81400ddc 813ffcf4 00000000 00000000 00000000 00000000 00000000 cb811902 5e60: 00000000 00000000 824a35ec 0000005f 840c2a30 00000064 846604d4 84555400 5e80: e0265ee4 e0265e90 807b7d30 807ae254 00000064 00000001 00000000 e0265eac 5ea0: 862fd310 83437990 00006400 0000000b e0265ea0 00000000 00000000 cb811902 5ec0: 85afe240 40946400 20000440 20000440 85afe240 00000003 e0265ef4 e0265ee8 5ee0: 807b7e50 cb811902 e0265f14 40946400 00000000 85afe241 20000440 85afe240 5f00: 00000003 84555400 e0265fa4 e0265f18 805854f4 8140082c ecac8b10 84555400 5f20: e0265f3c e0265f30 81aaf29c 81aaf16c e0265f54 e0265f40 8025bcbc 8028e07c 5f40: e0265fb0 40000000 e0265f84 e0265f58 80221a38 8025bc78 00000000 8281d17c 5f60: e0265fb0 0014c880 ecac8b10 8022198c 00000000 cb811902 e0265fac 00000000 5f80: 00000000 00316310 00000036 8020029c 84555400 00000036 00000000 e0265fa8 5fa0: 80200060 805853d0 00000000 00000000 00000003 40946400 20000440 00000000 5fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f700bc 5fe0: 76f6fec0 76f6feb0 0001929c 00132320 60000010 00000003 00000000 00000000 Call trace: [<81408674>] (parport_attach) from [<81404490>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:8445ab84 r5:81e1a7f8 r4:829d3f08 [<81404388>] (comedi_device_attach) from [<813ffde8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:84555400 r7:8445ab70 r6:b5403587 r5:8445ab40 r4:20000440 [<813ffce8>] (do_devconfig_ioctl) from [<81400ddc>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:84555400 r7:8445ab70 r6:20000440 r5:8445ab40 r4:85afe240 [<81400820>] (comedi_unlocked_ioctl) from [<805854f4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400820>] (comedi_unlocked_ioctl) from [<805854f4>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400820>] (comedi_unlocked_ioctl) from [<805854f4>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400820>] (comedi_unlocked_ioctl) from [<805854f4>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:84555400 r9:00000003 r8:85afe240 r7:20000440 r6:85afe241 r5:00000000 r4:40946400 [<805853c4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0265fa8 to 0xe0265ff0) 5fa0: 00000000 00000000 00000003 40946400 20000440 00000000 5fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f700bc 5fe0: 76f6fec0 76f6feb0 0001929c 00132320 r10:00000036 r9:84555400 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