8<--- cut here --- Unable to handle kernel paging request at virtual address fee00026 when write [fee00026] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 9606 Comm: syz.1.12974 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: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 : [<81409608>] lr : [<814095f8>] psr: 60000013 sp : dfb19d28 ip : dfb19d28 fp : dfb19d4c r10: 82b28ad8 r9 : 00000003 r8 : 844b2f00 r7 : dfb19d88 r6 : 844b2f00 r5 : 00000000 r4 : 00000000 r3 : fee00026 r2 : 81e1a318 r1 : 00000001 r0 : 81409278 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 853fa5c0 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 844b2f00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb18000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 844b2f00 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 0xdfb18000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfb18000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.1.12974 (pid: 9606, stack limit = 0xdfb18000) Stack: (0xdfb19d28 to 0xdfb1a000) 9d20: 82433330 844b2f00 829d3f08 829d3f08 81e1a7d8 844b2f44 9d40: dfb19d84 dfb19d50 814052b4 814094a0 844b2f30 00000000 dfb19d74 200000c0 9d60: 844b2f00 b5403587 844b2f30 85fdec00 40946400 00000003 dfb19e44 dfb19d88 9d80: 81400c0c 814051b8 656d6f63 705f6964 6f707261 00007472 00000000 00000026 9da0: 000007ff 00000001 fffffffc 00000000 00000ccc 00000009 0000000b 0000000a 9dc0: 000000fc 00000002 00000001 00000008 00000004 00000006 00000000 00000007 9de0: 0001a449 00000003 40000007 00000100 00000002 00000f27 00000003 00000008 9e00: 00000008 00000008 00000007 00000004 00010005 00000006 00000000 a74909ca 9e20: 00000000 8610be40 844b2f00 200000c0 844b2f30 85fdec00 dfb19f14 dfb19e48 9e40: 81401c00 81400b18 00000000 00000000 00000000 dfb19e54 dfb19e54 a74909ca 9e60: 8029045c 00000000 824a45ec 0000005f 8462e058 00000064 844c67a4 85fdec00 9e80: dfb19ee4 dfb19e90 807b85c0 807aeae4 00000064 00000001 00000000 dfb19eac 9ea0: 85c95850 834f05d8 00006400 0000000b dfb19ea0 00000000 dfb19d40 a74909ca 9ec0: 8610be40 40946400 200000c0 200000c0 8610be40 00000003 dfb19ef4 dfb19ee8 9ee0: 807b86e0 a74909ca dfb19f14 40946400 00000000 8610be41 200000c0 8610be40 9f00: 00000003 85fdec00 dfb19fa4 dfb19f18 80585ba8 81401650 ecac8b10 85fdec00 9f20: dfb19f3c dfb19f30 81ab06a4 81ab0574 dfb19f54 dfb19f40 8025bcbc 8028e0c4 9f40: dfb19fb0 40000000 dfb19f84 dfb19f58 80221a38 8025bc78 00000000 8281cf7c 9f60: dfb19fb0 0014c8c0 ecac8b10 8022198c 00000000 a74909ca dfb19fac 00000000 9f80: 00000000 00326310 00000036 8020029c 85fdec00 00000036 00000000 dfb19fa8 9fa0: 80200060 80585a84 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76fd00bc 9fe0: 76fcfec0 76fcfeb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<81409494>] (parport_attach) from [<814052b4>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:844b2f44 r5:81e1a7d8 r4:829d3f08 [<814051ac>] (comedi_device_attach) from [<81400c0c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:85fdec00 r7:844b2f30 r6:b5403587 r5:844b2f00 r4:200000c0 [<81400b0c>] (do_devconfig_ioctl) from [<81401c00>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:85fdec00 r7:844b2f30 r6:200000c0 r5:844b2f00 r4:8610be40 [<81401644>] (comedi_unlocked_ioctl) from [<80585ba8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81401644>] (comedi_unlocked_ioctl) from [<80585ba8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81401644>] (comedi_unlocked_ioctl) from [<80585ba8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81401644>] (comedi_unlocked_ioctl) from [<80585ba8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85fdec00 r9:00000003 r8:8610be40 r7:200000c0 r6:8610be41 r5:00000000 r4:40946400 [<80585a78>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb19fa8 to 0xdfb19ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76fd00bc 9fe0: 76fcfec0 76fcfeb0 000192bc 00132360 r10:00000036 r9:85fdec00 r8:8020029c r7:00000036 r6:00326310 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