8<--- cut here --- Unable to handle kernel paging request at virtual address fee02000 when write [fee02000] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4384 Comm: syz.0.213 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: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 : [<8145884c>] lr : [<8145883c>] psr: 60000013 sp : dfc09d30 ip : dfc09d30 fp : dfc09d54 r10: 82d2cdc4 r9 : 00000003 r8 : 8301b540 r7 : dfc09d90 r6 : 8301b540 r5 : 00000000 r4 : 00000000 r3 : fee02000 r2 : 81e27508 r1 : 00000001 r0 : 814584ac Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86aaf080 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 8301b540 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfc08000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 8301b540 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 0xdfc08000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xdfc08000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.0.213 (pid: 4384, stack limit = 0xdfc08000) Stack: (0xdfc09d30 to 0xdfc0a000) 9d20: ffffffff 00000004 00000000 82bd2aa0 9d40: 81e279c8 00000000 dfc09d8c dfc09d58 814543ac 814586d4 40946400 00000000 9d60: dfc09d7c 20000180 8301b540 b5403587 40946400 00000003 00000003 83e4f080 9d80: dfc09e4c dfc09d90 8144fbb8 814542b0 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00002000 00000000 00000004 00000001 00000025 00000000 00000400 9dc0: 00000007 54c6cff3 000000fd 00000003 00000003 fffffff7 00400101 00000006 9de0: 00000002 00000000 0000007f 00000003 40000003 00000009 00000004 00000004 9e00: 20001e5b 00000003 00002e66 00000003 00000006 00004006 00000000 00000003 9e20: 00000000 743dcf74 00000000 84ec2a80 8301b540 20000180 40946400 00000003 9e40: dfc09f14 dfc09e50 81450edc 8144faf0 00000000 743dcf74 00000000 00000000 9e60: 82530804 dfc09ea4 0000005f 841eb4a0 00000064 8301b570 dfc09ee4 dfc09e88 9e80: 807e9760 807dfa74 00000064 00000001 00000000 dfc09ea4 8383ed90 83430770 9ea0: 00006400 0000000b dfc09e98 00000000 00000000 743dcf74 00000000 84ec2a80 9ec0: 40946400 20000180 20000180 84ec2a80 00000003 83e4f080 dfc09ef4 dfc09ee8 9ee0: 807e9894 743dcf74 dfc09f14 00000000 84ec2a81 40946400 20000180 84ec2a80 9f00: 00000003 83e4f080 dfc09fa4 dfc09f18 805a1adc 81450b94 ecac8b10 83e4f080 9f20: dfc09f3c dfc09f30 81b168d4 81b167a0 dfc09f54 dfc09f40 8025a6bc 8028e2a4 9f40: dfc09fb0 40000000 dfc09f84 dfc09f58 80220be0 8025a678 00000000 82a1c63c 9f60: dfc09fb0 0013e9b0 ecac8b10 80220b34 00000000 743dcf74 dfc09fac 00000000 9f80: 00000000 00346310 00000036 8020029c 83e4f080 00000036 00000000 dfc09fa8 9fa0: 80200060 805a18a4 00000000 00000000 00000003 40946400 20000180 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f630dc 9fe0: 76f62e88 76f62e78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<814586c8>] (parport_attach) from [<814543ac>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e279c8 r4:82bd2aa0 [<814542a4>] (comedi_device_attach) from [<8144fbb8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:83e4f080 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301b540 r4:20000180 [<8144fae4>] (do_devconfig_ioctl) from [<81450edc>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:8301b540 r4:84ec2a80 [<81450b88>] (comedi_unlocked_ioctl) from [<805a1adc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81450b88>] (comedi_unlocked_ioctl) from [<805a1adc>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81450b88>] (comedi_unlocked_ioctl) from [<805a1adc>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81450b88>] (comedi_unlocked_ioctl) from [<805a1adc>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83e4f080 r9:00000003 r8:84ec2a80 r7:20000180 r6:40946400 r5:84ec2a81 r4:00000000 [<805a1898>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc09fa8 to 0xdfc09ff0) 9fa0: 00000000 00000000 00000003 40946400 20000180 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f630dc 9fe0: 76f62e88 76f62e78 00018ebc 00130810 r10:00000036 r9:83e4f080 r8:8020029c r7:00000036 r6:00346310 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