8<--- cut here --- Unable to handle kernel paging request at virtual address fee00140 when write [fee00140] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 5166 Comm: syz.2.326 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 parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] PC is at parport_attach+0x184/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] LR is at parport_attach+0x174/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<81492c6c>] lr : [<81492c5c>] psr: 60000013 sp : dfc7dd30 ip : dfc7dd30 fp : dfc7dd54 r10: 82d30dfc r9 : 00000003 r8 : 8301b600 r7 : dfc7dd90 r6 : 8301b600 r5 : 00000000 r4 : 00000000 r3 : fee00140 r2 : 81e2dd68 r1 : 00000001 r0 : 814928cc Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 863c3d40 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:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 8301b600 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfc7c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 8301b600 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 0xdfc7c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfc7c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.2.326 (pid: 5166, stack limit = 0xdfc7c000) Stack: (0xdfc7dd30 to 0xdfc7e000) dd20: 824d4544 8301b600 82bd8e60 82bd8e60 dd40: 81e2e228 00000000 dfc7dd8c dfc7dd58 8148e7e8 81492af4 40946400 00000000 dd60: dfc7dd7c 200003c0 8301b600 b5403587 40946400 00000002 00000003 839d24c0 dd80: dfc7de4c dfc7dd90 81489fec 8148e6ec 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00000140 fffffffc 0001000c 0000dddc 00000000 00010000 00007fff ddc0: 00000006 00000007 0000c72c 02000004 0000000f 0000c000 00000008 000004ce dde0: 00000009 00000001 000000ad 00000006 00000008 00000004 00000000 0000000a de00: 00000009 00000ffd 00000009 000000af 00000002 00000283 00008001 0000e43f de20: 00000000 b9381824 00000000 85185380 8301b600 200003c0 40946400 00000002 de40: dfc7df14 dfc7de50 8148b314 81489f2c 00000000 b9381824 00000000 00000000 de60: 8254980c dfc7dea4 0000005f 846e5dd8 00000064 8301b630 dfc7dee4 dfc7de88 de80: 80806168 807fc3e4 00000064 00000001 00000000 dfc7dea4 833eb910 834fb220 dea0: 00006400 0000000b dfc7de98 00000000 00000000 b9381824 00000000 85185380 dec0: 40946400 200003c0 200003c0 85185380 00000003 839d24c0 dfc7def4 dfc7dee8 dee0: 8080629c b9381824 dfc7df14 00000000 85185381 40946400 200003c0 85185380 df00: 00000003 839d24c0 dfc7dfa4 dfc7df18 805bab08 8148afcc ecac8b10 839d24c0 df20: dfc7df3c dfc7df30 81b575c0 81b5748c dfc7df54 dfc7df40 8025a7a4 8028e480 df40: dfc7dfb0 40000000 dfc7df84 dfc7df58 80220bdc 8025a760 00000000 82a1eb0c df60: dfc7dfb0 0013e9c0 ecac8b10 80220b30 00000000 b9381824 dfc7dfac 00000000 df80: 00000000 00356310 00000036 8020029c 839d24c0 00000036 00000000 dfc7dfa8 dfa0: 80200060 805ba8d0 00000000 00000000 00000003 40946400 200003c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f680dc dfe0: 76f67e88 76f67e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<81492ae8>] (parport_attach) from [<8148e7e8>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e2e228 r4:82bd8e60 [<8148e6e0>] (comedi_device_attach) from [<81489fec>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:839d24c0 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:8301b600 r4:200003c0 [<81489f20>] (do_devconfig_ioctl) from [<8148b314>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:8301b600 r4:85185380 [<8148afc0>] (comedi_unlocked_ioctl) from [<805bab08>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148afc0>] (comedi_unlocked_ioctl) from [<805bab08>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148afc0>] (comedi_unlocked_ioctl) from [<805bab08>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148afc0>] (comedi_unlocked_ioctl) from [<805bab08>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:839d24c0 r9:00000003 r8:85185380 r7:200003c0 r6:40946400 r5:85185381 r4:00000000 [<805ba8c4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc7dfa8 to 0xdfc7dff0) dfa0: 00000000 00000000 00000003 40946400 200003c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f680dc dfe0: 76f67e88 76f67e78 00018ebc 00130820 r10:00000036 r9:839d24c0 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: e5963064 e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e5963064 ldr r3, [r6, #100] @ 0x64 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