8<--- cut here --- Unable to handle kernel paging request at virtual address fee01610 when write [fee01610] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 11076 Comm: syz.0.1115 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 : [<814314bc>] lr : [<814314ac>] psr: 60000013 sp : dfcbdd30 ip : dfcbdd30 fp : dfcbdd54 r10: 82b2efdc r9 : 00000003 r8 : 8301a480 r7 : dfcbdd90 r6 : 8301a480 r5 : 00000000 r4 : 00000000 r3 : fee01610 r2 : 81e24918 r1 : 00000001 r0 : 8143112c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86beffc0 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 8301a480 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfcbc000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r8 information: slab kmalloc-192 start 8301a480 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 0xdfcbc000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xdfcbc000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.0.1115 (pid: 11076, stack limit = 0xdfcbc000) Stack: (0xdfcbdd30 to 0xdfcbe000) dd20: dfcbdd4c dfcbdd40 829d6640 829d6640 dd40: 81e24dd8 00000000 dfcbdd8c dfcbdd58 8142d030 81431354 40946400 00000000 dd60: dfcbdd7c 200000c0 8301a480 b5403587 40946400 00000003 00000003 83f42400 dd80: dfcbde4c dfcbdd90 8142883c 8142cf30 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00001610 00000000 00000001 00000000 00000003 00000cc7 00000009 ddc0: 00000aab 0000000a 00000100 00000002 00000001 00000008 01100004 00000006 dde0: 00000009 00000001 0001a449 00000003 40000003 00000089 00000002 00000f27 de00: 00000006 0000800b 00000ca8 00000005 00000004 00000400 00010000 fffffff7 de20: 00000000 619b5f4b 00000000 85f3d600 8301a480 200000c0 40946400 00000003 de40: dfcbdf14 dfcbde50 81429b60 81428774 00000000 619b5f4b 00000000 00000000 de60: 824b857c dfcbdea4 0000005f 84111be8 00000064 8301a4b0 dfcbdee4 dfcbde88 de80: 807cda48 807c3e20 00000064 00000001 00000000 dfcbdea4 86331490 834f1198 dea0: 00006400 0000000b dfcbde98 00000000 00000000 619b5f4b 00000000 85f3d600 dec0: 40946400 200000c0 200000c0 85f3d600 00000003 83f42400 dfcbdef4 dfcbdee8 dee0: 807cdb78 619b5f4b dfcbdf14 00000000 85f3d601 40946400 200000c0 85f3d600 df00: 00000003 83f42400 dfcbdfa4 dfcbdf18 8058f90c 81429818 ecac8b10 83f42400 df20: dfcbdf3c dfcbdf30 81ae1a14 81ae18e0 dfcbdf54 dfcbdf40 8025a868 8028c368 df40: dfcbdfb0 40000000 dfcbdf84 dfcbdf58 80220bf8 8025a824 00000000 8281d2bc df60: dfcbdfb0 0013e480 ecac8b10 80220b4c 00000000 619b5f4b dfcbdfac 00000000 df80: 00000000 00346310 00000036 8020029c 83f42400 00000036 00000000 dfcbdfa8 dfa0: 80200060 8058f6d4 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f820dc dfe0: 76f81e88 76f81e78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<81431348>] (parport_attach) from [<8142d030>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e24dd8 r4:829d6640 [<8142cf24>] (comedi_device_attach) from [<8142883c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:83f42400 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301a480 r4:200000c0 [<81428768>] (do_devconfig_ioctl) from [<81429b60>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:8301a480 r4:85f3d600 [<8142980c>] (comedi_unlocked_ioctl) from [<8058f90c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142980c>] (comedi_unlocked_ioctl) from [<8058f90c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142980c>] (comedi_unlocked_ioctl) from [<8058f90c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142980c>] (comedi_unlocked_ioctl) from [<8058f90c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83f42400 r9:00000003 r8:85f3d600 r7:200000c0 r6:40946400 r5:85f3d601 r4:00000000 [<8058f6c8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfcbdfa8 to 0xdfcbdff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f820dc dfe0: 76f81e88 76f81e78 00018ba0 001302e0 r10:00000036 r9:83f42400 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