8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4889 Comm: syz.1.276 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 : [<814013b4>] lr : [<814013a4>] psr: 60000013 sp : dfbc1d30 ip : dfbc1d30 fp : dfbc1d54 r10: 82b29b30 r9 : 00000003 r8 : 84561a80 r7 : dfbc1d90 r6 : 84561a80 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e24f44 r1 : 00000001 r0 : 81401024 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85bde040 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 84561a80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfbc0000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 84561a80 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 0xdfbc0000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfbc0000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Process syz.1.276 (pid: 4889, stack limit = 0xdfbc0000) Stack: (0xdfbc1d30 to 0xdfbc2000) 1d20: 8243d118 84561a80 829d4280 829d4280 1d40: 81e25404 00000000 dfbc1d8c dfbc1d58 813fcfe0 8140124c 40946400 00000000 1d60: dfbc1d7c 200000c0 84561a80 b5403587 40946400 84c61800 00000003 84561ab0 1d80: dfbc1e4c dfbc1d90 813f8918 813fcee0 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00004f27 00000401 00010000 00000004 00000005 00000cc7 00000008 1dc0: 00000007 0000000a 00000100 00000002 00000001 00000001 00000001 00000006 1de0: 00000101 00000000 0001a449 000048b3 40000003 00000089 0000caa7 00000000 1e00: 20001e5a 0000000b 00000e69 0000003c 02000008 00000006 00000000 fffffff8 1e20: 00000000 6ac3de17 00000000 85a29240 84561a80 200000c0 40946400 84c61800 1e40: dfbc1f14 dfbc1e50 813f9498 813f8850 00000000 6ac3de17 00000000 00000000 1e60: 824b15ec dfbc1ea4 0000005f 843259f0 00000064 84540b4c dfbc1ee4 dfbc1e88 1e80: 807b4124 807aa7a0 00000064 00000001 00000000 dfbc1ea4 85cea850 834d57f8 1ea0: 00006400 0000000b dfbc1e98 00000000 00000000 6ac3de17 00000000 85a29240 1ec0: 40946400 200000c0 200000c0 85a29240 00000003 84c61800 dfbc1ef4 dfbc1ee8 1ee0: 807b4254 6ac3de17 dfbc1f14 00000000 85a29241 40946400 200000c0 85a29240 1f00: 00000003 84c61800 dfbc1fa4 dfbc1f18 805821a4 813f93a0 ecac8b10 84c61800 1f20: dfbc1f3c dfbc1f30 81aa6e78 81aa6d48 dfbc1f54 dfbc1f40 8025ba7c 8028ef68 1f40: dfbc1fb0 40000000 dfbc1f84 dfbc1f58 80221a54 8025ba38 00000000 8281cf7c 1f60: dfbc1fb0 0013ddc0 ecac8b10 802219a8 00000000 6ac3de17 dfbc1fac 00000000 1f80: 00000000 00346310 00000036 8020029c 84c61800 00000036 00000000 dfbc1fa8 1fa0: 80200060 80581f6c 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f550dc 1fe0: 76f54e88 76f54e78 00018734 0012fc20 60000010 00000003 00000000 00000000 Call trace: [<81401240>] (parport_attach) from [<813fcfe0>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e25404 r4:829d4280 [<813fced4>] (comedi_device_attach) from [<813f8918>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:84561ab0 r9:00000003 r8:84c61800 r7:40946400 r6:b5403587 r5:84561a80 r4:200000c0 [<813f8844>] (do_devconfig_ioctl) from [<813f9498>] (comedi_unlocked_ioctl+0x104/0x1c80 drivers/comedi/comedi_fops.c:2240) r8:84c61800 r7:40946400 r6:200000c0 r5:84561a80 r4:85a29240 [<813f9394>] (comedi_unlocked_ioctl) from [<805821a4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813f9394>] (comedi_unlocked_ioctl) from [<805821a4>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813f9394>] (comedi_unlocked_ioctl) from [<805821a4>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813f9394>] (comedi_unlocked_ioctl) from [<805821a4>] (sys_ioctl+0x244/0xb58 fs/ioctl.c:583) r10:84c61800 r9:00000003 r8:85a29240 r7:200000c0 r6:40946400 r5:85a29241 r4:00000000 [<80581f60>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbc1fa8 to 0xdfbc1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f550dc 1fe0: 76f54e88 76f54e78 00018734 0012fc20 r10:00000036 r9:84c61800 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