8<--- cut here --- Unable to handle kernel paging request at virtual address fee08001 when write [fee08001] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 13252 Comm: syz.0.1762 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 : [<8140a268>] lr : [<8140a258>] psr: 60000013 sp : dfa75d28 ip : dfa75d28 fp : dfa75d4c r10: 82b28ad8 r9 : 00000003 r8 : 84530600 r7 : dfa75d88 r6 : 84530600 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e1a338 r1 : 00000001 r0 : 81409ed8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8618b180 DAC: fffffffd 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 84530600 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa74000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 84530600 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 0xdfa74000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfa74000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.0.1762 (pid: 13252, stack limit = 0xdfa74000) Stack: (0xdfa75d28 to 0xdfa76000) 5d20: 824333d4 84530600 829d3f08 829d3f08 81e1a7f8 84530644 5d40: dfa75d84 dfa75d50 81405f14 8140a100 84530630 00000000 dfa75d74 20000180 5d60: 84530600 b5403587 84530630 83ef2400 40946400 00000003 dfa75e44 dfa75d88 5d80: 8140186c 81405e18 656d6f63 705f6964 6f707261 00007472 00000000 00008001 5da0: 00000004 00000001 00000000 00000000 00000cc7 00000008 00000007 00000001 5dc0: 000000ff 00000002 00000001 00000008 00000002 00000006 00000005 00000001 5de0: 00000009 00000043 40000003 00000089 00000009 00000f27 00000006 00008008 5e00: 00000009 00000005 00000004 00000008 00010000 fffffff4 00000000 467e543b 5e20: 00000000 86f50480 84530600 20000180 84530630 83ef2400 dfa75f14 dfa75e48 5e40: 81402860 81401778 00000000 00000000 00000000 00000000 00000000 467e543b 5e60: 00000000 00000000 824a45ec 0000005f 84456a30 00000064 843e4f3c 83ef2400 5e80: dfa75ee4 dfa75e90 807b85a8 807aeacc 00000064 00000001 00000000 dfa75eac 5ea0: 85cc7910 8342e440 00006400 0000000b dfa75ea0 00000000 00000000 467e543b 5ec0: 86f50480 40946400 20000180 20000180 86f50480 00000003 dfa75ef4 dfa75ee8 5ee0: 807b86c8 467e543b dfa75f14 40946400 00000000 86f50481 20000180 86f50480 5f00: 00000003 83ef2400 dfa75fa4 dfa75f18 80585b90 814022b0 ecac8b10 83ef2400 5f20: dfa75f3c dfa75f30 81ab1384 81ab1254 dfa75f54 dfa75f40 8025bcbc 8028e0c4 5f40: dfa75fb0 40000000 dfa75f84 dfa75f58 80221a38 8025bc78 00000000 8281cf7c 5f60: dfa75fb0 0014c8c0 ecac8b10 8022198c 00000000 467e543b dfa75fac 00000000 5f80: 00000000 00326310 00000036 8020029c 83ef2400 00000036 00000000 dfa75fa8 5fa0: 80200060 80585a6c 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f210bc 5fe0: 76f20ec0 76f20eb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<8140a0f4>] (parport_attach) from [<81405f14>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:84530644 r5:81e1a7f8 r4:829d3f08 [<81405e0c>] (comedi_device_attach) from [<8140186c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:83ef2400 r7:84530630 r6:b5403587 r5:84530600 r4:20000180 [<8140176c>] (do_devconfig_ioctl) from [<81402860>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:83ef2400 r7:84530630 r6:20000180 r5:84530600 r4:86f50480 [<814022a4>] (comedi_unlocked_ioctl) from [<80585b90>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814022a4>] (comedi_unlocked_ioctl) from [<80585b90>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814022a4>] (comedi_unlocked_ioctl) from [<80585b90>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814022a4>] (comedi_unlocked_ioctl) from [<80585b90>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83ef2400 r9:00000003 r8:86f50480 r7:20000180 r6:86f50481 r5:00000000 r4:40946400 [<80585a60>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa75fa8 to 0xdfa75ff0) 5fa0: 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f210bc 5fe0: 76f20ec0 76f20eb0 000192bc 00132360 r10:00000036 r9:83ef2400 r8:8020029c r7:00000036 r6:00326310 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