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: 20637 Comm: syz.1.3113 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : [<81493794>] lr : [<81493784>] psr: 60000013 sp : ea62dd30 ip : ea62dd30 fp : ea62dd54 r10: 82d30dfc r9 : 00000003 r8 : 84767180 r7 : ea62dd90 r6 : 84767180 r5 : 00000000 r4 : 00000000 r3 : fee00140 r2 : 81e2dee8 r1 : 00000001 r0 : 814933f4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 87edea40 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 84767180 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea62c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 84767180 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 0xea62c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xea62c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.1.3113 (pid: 20637, stack limit = 0xea62c000) Stack: (0xea62dd30 to 0xea62e000) dd20: 824d49b8 84767180 82bd8ea0 82bd8ea0 dd40: 81e2e3a8 00000000 ea62dd8c ea62dd58 8148f310 8149361c 40946400 00000000 dd60: ea62dd7c 200000c0 84767180 b5403587 40946400 00000002 00000003 83f6a4c0 dd80: ea62de4c ea62dd90 8148ab14 8148f214 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00000140 0000000c 00000007 00000002 10000007 00000007 00008002 ddc0: 00008000 00000007 0000c72d 00000000 00000007 00000003 0000000a 00000029 dde0: 000072ef 00000101 00000006 00000006 00000009 00000004 0000000e 0000a2d8 de00: 00000009 00001000 00000009 00000471 ffffff7f 00000383 00008001 00000004 de20: 00000000 9831df0a 00000000 8633e980 84767180 200000c0 40946400 00000002 de40: ea62df14 ea62de50 8148be3c 8148aa54 00000000 9831df0a 00000000 00000000 de60: 8254980c ea62dea4 0000005f 845694a0 00000064 847671b0 ea62dee4 ea62de88 de80: 80806188 807fc404 00000064 00000001 00000000 ea62dea4 85bbec10 834eca18 dea0: 00006400 0000000b ea62de98 00000000 00000000 9831df0a 00000000 8633e980 dec0: 40946400 200000c0 200000c0 8633e980 00000003 83f6a4c0 ea62def4 ea62dee8 dee0: 808062bc 9831df0a ea62df14 00000000 8633e981 40946400 200000c0 8633e980 df00: 00000003 83f6a4c0 ea62dfa4 ea62df18 805bab28 8148baf4 ecac8b10 83f6a4c0 df20: ea62df3c ea62df30 81b58240 81b5810c ea62df54 ea62df40 8025a7a8 8028e490 df40: ea62dfb0 40000000 ea62df84 ea62df58 80220bdc 8025a764 00000000 82a1eb0c df60: ea62dfb0 0013e9c0 ecac8b10 80220b30 00000000 9831df0a ea62dfac 00000000 df80: 00000000 00356310 00000036 8020029c 83f6a4c0 00000036 00000000 ea62dfa8 dfa0: 80200060 805ba8f0 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f100dc dfe0: 76f0fe88 76f0fe78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<81493610>] (parport_attach) from [<8148f310>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e2e3a8 r4:82bd8ea0 [<8148f208>] (comedi_device_attach) from [<8148ab14>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:83f6a4c0 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:84767180 r4:200000c0 [<8148aa48>] (do_devconfig_ioctl) from [<8148be3c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200000c0 r5:84767180 r4:8633e980 [<8148bae8>] (comedi_unlocked_ioctl) from [<805bab28>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148bae8>] (comedi_unlocked_ioctl) from [<805bab28>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148bae8>] (comedi_unlocked_ioctl) from [<805bab28>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148bae8>] (comedi_unlocked_ioctl) from [<805bab28>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83f6a4c0 r9:00000003 r8:8633e980 r7:200000c0 r6:40946400 r5:8633e981 r4:00000000 [<805ba8e4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea62dfa8 to 0xea62dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f100dc dfe0: 76f0fe88 76f0fe78 00018ebc 00130820 r10:00000036 r9:83f6a4c0 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