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: 0 UID: 0 PID: 28300 Comm: syz.6.7234 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:243 [inline] PC is at parport_attach+0x5c/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:243 [inline] LR is at parport_attach+0x50/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 pc : [<81494db0>] lr : [<81494da4>] psr: 60000013 sp : df94dd30 ip : df94dd30 fp : df94dd54 r10: 82d30dfc r9 : 00000003 r8 : 842a9600 r7 : df94dd90 r6 : df94dd90 r5 : 842a9600 r4 : 00000000 r3 : fee02f00 r2 : 00000000 r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 921ad380 DAC: fffffffd Register r0 information: NULL pointer Register r1 information: NULL pointer Register r2 information: NULL pointer 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: slab kmalloc-192 start 842a9600 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xdf94c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r7 information: 2-page vmalloc region starting at 0xdf94c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 842a9600 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 0xdf94c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdf94c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.6.7234 (pid: 28300, stack limit = 0xdf94c000) Stack: (0xdf94dd30 to 0xdf94e000) dd20: ffffffff 00000004 82bd8ea0 81e2e428 dd40: 00000000 df94dd90 df94dd8c df94dd58 81490a40 81494d60 40946400 00000000 dd60: df94dd7c 20000300 842a9600 b5403587 40946400 00000001 00000003 8331a4c0 dd80: df94de4c df94dd90 8148c244 81490944 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 17474474 00000000 86082600 842a9600 20000300 40946400 00000001 de40: df94df14 df94de50 8148d56c 8148c184 df94de4c 17474474 00000000 00000000 de60: 82549844 df94dea4 0000005f 8445fc00 00000064 842a9630 df94dee4 df94de88 de80: 80806574 807fcc2c 00000064 00000001 00000000 df94dea4 86223c10 83431dd0 dea0: 00006400 0000000b df94de98 00000000 df94dd38 17474474 00000000 86082600 dec0: 40946400 20000300 20000300 86082600 00000003 8331a4c0 df94def4 df94dee8 dee0: 808066a8 17474474 df94df14 00000000 86082601 40946400 20000300 86082600 df00: 00000003 8331a4c0 df94dfa4 df94df18 805bb004 8148d224 ecac8b10 8331a4c0 df20: df94df3c df94df30 81b5b0a0 81b5af6c df94df54 df94df40 8025a7a8 8028e490 df40: df94dfb0 40000000 df94df84 df94df58 80220bdc 8025a764 00000000 82a1eb0c df60: df94dfb0 0013ea70 ecac8b10 80220b30 00000000 17474474 df94dfac 00000000 df80: 00000000 00356310 00000036 8020029c 8331a4c0 00000036 00000000 df94dfa8 dfa0: 80200060 805badcc 00000000 00000000 00000003 40946400 20000300 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fb70dc dfe0: 76fb6e88 76fb6e78 00018ebc 001308d0 60000010 00000003 00000000 00000000 Call trace: [<81494d54>] (parport_attach) from [<81490a40>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:df94dd90 r6:00000000 r5:81e2e428 r4:82bd8ea0 [<81490938>] (comedi_device_attach) from [<8148c244>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:8331a4c0 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:842a9600 r4:20000300 [<8148c178>] (do_devconfig_ioctl) from [<8148d56c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000300 r5:842a9600 r4:86082600 [<8148d218>] (comedi_unlocked_ioctl) from [<805bb004>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148d218>] (comedi_unlocked_ioctl) from [<805bb004>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148d218>] (comedi_unlocked_ioctl) from [<805bb004>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148d218>] (comedi_unlocked_ioctl) from [<805bb004>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8331a4c0 r9:00000003 r8:86082600 r7:20000300 r6:40946400 r5:86082601 r4:00000000 [<805badc0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf94dfa8 to 0xdf94dff0) dfa0: 00000000 00000000 00000003 40946400 20000300 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fb70dc dfe0: 76fb6e88 76fb6e78 00018ebc 001308d0 r10:00000036 r9:8331a4c0 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb67f9c e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb67f9c bl 0xfed9fe78 4: e5953064 ldr r3, [r5, #100] @ 0x64 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction