8<--- cut here --- Unable to handle kernel paging request at virtual address fee02f00 when write [fee02f00] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6186 Comm: syz.2.640 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 : [<813cb760>] lr : [<813cb750>] psr: 60000013 sp : dfc0dd30 ip : dfc0dd30 fp : dfc0dd54 r10: 82b24908 r9 : 00000003 r8 : 84183c00 r7 : dfc0dd90 r6 : 84183c00 r5 : 00000000 r4 : 00000000 r3 : fee02f00 r2 : 81e1765c r1 : 00000001 r0 : 813cb3d0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86391300 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:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 84183c00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfc0c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 84183c00 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 0xdfc0c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfc0c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.2.640 (pid: 6186, stack limit = 0xdfc0c000) Stack: (0xdfc0dd30 to 0xdfc0e000) dd20: 823ecc98 84183c00 829d1b3c 829d1b3c dd40: 81e17b1c 84183c44 dfc0dd8c dfc0dd58 813c77ec 813cb5f8 20000300 00000000 dd60: dfc0dd7c 20000300 84183c00 b5403587 20000300 84d8a400 40946400 00000001 dd80: dfc0de4c dfc0dd90 813c3338 813c76f0 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00002f00 00000005 0000d09a ffffffff 00000003 fffffffe 20000004 ddc0: 00000003 00000ffe 7fffffff 0000000c 00000002 00000004 00000008 0000ffff dde0: 00000006 00000005 000007ff 00000830 00000008 00010000 00000009 00000800 de00: 00000101 00000002 00008001 00000007 00000003 00000004 00000005 0000070f de20: 00000000 e32a65ea 00000000 86000000 84183c00 20000300 20000300 84d8a400 de40: dfc0df14 dfc0de50 813c4304 813c3244 00000000 00000000 00000000 e32a65ea de60: 00000000 00000000 8245d5b4 0000005f 83db4250 84183c30 83e40f84 84d8a400 de80: dfc0dee4 dfc0de90 807a5fa4 8079c39c 00000064 00000001 00000000 dfc0deac dea0: 84a1dcd0 83432b28 00006400 0000000b dfc0dea0 00000000 00000000 e32a65ea dec0: 86000000 40946400 20000300 20000300 86000000 00000003 dfc0def4 dfc0dee8 dee0: 807a60c4 e32a65ea dfc0df14 40946400 00000000 86000001 20000300 86000000 df00: 00000003 84d8a400 dfc0dfa4 dfc0df18 80577dc8 813c3d34 ecac8b10 84d8a400 df20: dfc0df3c dfc0df30 81a363f8 81a362c8 dfc0df54 dfc0df40 8025c478 8028d90c df40: dfc0dfb0 40000000 dfc0df84 dfc0df58 802229ec 8025c434 00000000 8281cf74 df60: dfc0dfb0 0014ca70 ecac8b10 80222940 00000000 e32a65ea dfc0dfac 00000000 df80: 00000000 00316308 00000036 8020029c 84d8a400 00000036 00000000 dfc0dfa8 dfa0: 80200060 80577ca4 00000000 00000000 00000003 40946400 20000300 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f4d0bc dfe0: 76f4cec0 76f4ceb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813cb5ec>] (parport_attach) from [<813c77ec>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:84183c44 r5:81e17b1c r4:829d1b3c [<813c76e4>] (comedi_device_attach) from [<813c3338>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000001 r9:40946400 r8:84d8a400 r7:20000300 r6:b5403587 r5:84183c00 r4:20000300 [<813c3238>] (do_devconfig_ioctl) from [<813c4304>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:84d8a400 r7:20000300 r6:20000300 r5:84183c00 r4:86000000 [<813c3d28>] (comedi_unlocked_ioctl) from [<80577dc8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c3d28>] (comedi_unlocked_ioctl) from [<80577dc8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c3d28>] (comedi_unlocked_ioctl) from [<80577dc8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c3d28>] (comedi_unlocked_ioctl) from [<80577dc8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:84d8a400 r9:00000003 r8:86000000 r7:20000300 r6:86000001 r5:00000000 r4:40946400 [<80577c98>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc0dfa8 to 0xdfc0dff0) dfa0: 00000000 00000000 00000003 40946400 20000300 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f4d0bc dfe0: 76f4cec0 76f4ceb0 000195a4 00132510 r10:00000036 r9:84d8a400 r8:8020029c r7:00000036 r6:00316308 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