8<--- cut here --- Unable to handle kernel paging request at virtual address fee00001 when write [fee00001] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 9962 Comm: syz.4.1418 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: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 : [<81431fbc>] lr : [<81431fac>] psr: 60000013 sp : df9edd30 ip : df9edd30 fp : df9edd54 r10: 82b2efdc r9 : 00000003 r8 : 833a03c0 r7 : df9edd90 r6 : 833a03c0 r5 : 00000000 r4 : 00000000 r3 : fee00001 r2 : 81e24918 r1 : 00000001 r0 : 81431c2c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85278940 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 833a03c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf9ec000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r8 information: slab kmalloc-192 start 833a03c0 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 0xdf9ec000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xdf9ec000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.4.1418 (pid: 9962, stack limit = 0xdf9ec000) Stack: (0xdf9edd30 to 0xdf9ee000) dd20: 82444250 833a03c0 829d6680 829d6680 dd40: 81e24dd8 00000000 df9edd8c df9edd58 8142db30 81431e54 40946400 00000000 dd60: df9edd7c 200000c0 833a03c0 b5403587 40946400 00000001 00000003 8468a400 dd80: df9ede4c df9edd90 8142933c 8142da30 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00000001 00000002 000000da 00000003 00000004 00000003 00000401 ddc0: 00000006 00000004 00000005 00000003 ffffffff 00000009 00000081 00010001 dde0: 00000002 00000010 00008001 0000008d 00000064 00000122 00000400 00000031 de00: 00000005 80000000 00000002 80000001 00000001 0000a61c 00000007 00000049 de20: 00000000 18021ce7 00000000 86186300 833a03c0 200000c0 40946400 00000001 de40: df9edf14 df9ede50 8142a660 81429274 00000000 18021ce7 00000000 00000000 de60: 824b857c df9edea4 0000005f 8460ac28 00000064 833a03f0 df9edee4 df9ede88 de80: 807ce490 807c4868 00000064 00000001 00000000 df9edea4 8385f9d0 834e86e8 dea0: 00006400 0000000b df9ede98 00000000 00000000 18021ce7 00000000 86186300 dec0: 40946400 200000c0 200000c0 86186300 00000003 8468a400 df9edef4 df9edee8 dee0: 807ce5c0 18021ce7 df9edf14 00000000 86186301 40946400 200000c0 86186300 df00: 00000003 8468a400 df9edfa4 df9edf18 805903b8 8142a318 ecac8b10 8468a400 df20: df9edf3c df9edf30 81ae25d4 81ae24a0 df9edf54 df9edf40 8025a800 8028c2e0 df40: df9edfb0 40000000 df9edf84 df9edf58 80220bf8 8025a7bc 00000000 8281d2bc df60: df9edfb0 0013e480 ecac8b10 80220b4c 00000000 18021ce7 df9edfac 00000000 df80: 00000000 00346310 00000036 8020029c 8468a400 00000036 00000000 df9edfa8 dfa0: 80200060 80590180 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f580dc dfe0: 76f57e88 76f57e78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<81431e48>] (parport_attach) from [<8142db30>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e24dd8 r4:829d6680 [<8142da24>] (comedi_device_attach) from [<8142933c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:8468a400 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:833a03c0 r4:200000c0 [<81429268>] (do_devconfig_ioctl) from [<8142a660>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000001 r7:40946400 r6:200000c0 r5:833a03c0 r4:86186300 [<8142a30c>] (comedi_unlocked_ioctl) from [<805903b8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142a30c>] (comedi_unlocked_ioctl) from [<805903b8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142a30c>] (comedi_unlocked_ioctl) from [<805903b8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142a30c>] (comedi_unlocked_ioctl) from [<805903b8>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8468a400 r9:00000003 r8:86186300 r7:200000c0 r6:40946400 r5:86186301 r4:00000000 [<80590174>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9edfa8 to 0xdf9edff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f580dc dfe0: 76f57e88 76f57e78 00018ba0 001302e0 r10:00000036 r9:8468a400 r8:8020029c r7:00000036 r6:00346310 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