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: 6252 Comm: syz.2.596 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 : [<81408d38>] lr : [<81408d28>] psr: 60000013 sp : dfb55d28 ip : dfb55d28 fp : dfb55d4c r10: 82b28ad8 r9 : 00000003 r8 : 8455c3c0 r7 : dfb55d88 r6 : 8455c3c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1a2b8 r1 : 00000001 r0 : 814089a8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85c57980 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 8455c3c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb54000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 8455c3c0 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 0xdfb54000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfb54000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.2.596 (pid: 6252, stack limit = 0xdfb54000) Stack: (0xdfb55d28 to 0xdfb56000) 5d20: dfb55d44 dfb55d38 829d3f08 829d3f08 81e1a778 8455c404 5d40: dfb55d84 dfb55d50 814049e0 81408bd0 8455c3f0 00000000 dfb55d74 200000c0 5d60: 8455c3c0 b5403587 8455c3f0 832ea400 40946400 00000003 dfb55e44 dfb55d88 5d80: 81400338 814048e4 656d6f63 705f6964 6f707261 00007472 00000000 00004f27 5da0: 00000000 00000004 00000004 00000005 00000005 00000007 00000007 54c6cff3 5dc0: 000000fd 00000002 00000007 00000001 00000001 00000006 00000005 00000000 5de0: 0000007f 00000003 40000003 00000089 0000caa3 00000000 20001e5b 00000003 5e00: 00000e66 00000003 00000008 00004086 00000000 fffffff8 00000000 65523ac5 5e20: 00000000 851d1a80 8455c3c0 200000c0 8455c3f0 832ea400 dfb55f14 dfb55e48 5e40: 8140132c 81400244 00000000 00000000 00000000 00000000 00000000 65523ac5 5e60: 00000000 00000000 824a35ec 0000005f 8403fbe8 00000064 8419fdd4 832ea400 5e80: dfb55ee4 dfb55e90 807b7f80 807ae4a4 00000064 00000001 00000000 dfb55eac 5ea0: 85151d90 834eac38 00006400 0000000b dfb55ea0 00000000 00000000 65523ac5 5ec0: 851d1a80 40946400 200000c0 200000c0 851d1a80 00000003 dfb55ef4 dfb55ee8 5ee0: 807b80a0 65523ac5 dfb55f14 40946400 00000000 851d1a81 200000c0 851d1a80 5f00: 00000003 832ea400 dfb55fa4 dfb55f18 80585608 81400d7c ecac8b10 832ea400 5f20: dfb55f3c dfb55f30 81aaf9ac 81aaf87c dfb55f54 dfb55f40 8025bcbc 8028e0c4 5f40: dfb55fb0 40000000 dfb55f84 dfb55f58 80221a38 8025bc78 00000000 8281d17c 5f60: dfb55fb0 0014c8c0 ecac8b10 8022198c 00000000 65523ac5 dfb55fac 00000000 5f80: 00000000 00326310 00000036 8020029c 832ea400 00000036 00000000 dfb55fa8 5fa0: 80200060 805854e4 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f6b0bc 5fe0: 76f6aec0 76f6aeb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<81408bc4>] (parport_attach) from [<814049e0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:8455c404 r5:81e1a778 r4:829d3f08 [<814048d8>] (comedi_device_attach) from [<81400338>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:832ea400 r7:8455c3f0 r6:b5403587 r5:8455c3c0 r4:200000c0 [<81400238>] (do_devconfig_ioctl) from [<8140132c>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:832ea400 r7:8455c3f0 r6:200000c0 r5:8455c3c0 r4:851d1a80 [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:832ea400 r9:00000003 r8:851d1a80 r7:200000c0 r6:851d1a81 r5:00000000 r4:40946400 [<805854d8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb55fa8 to 0xdfb55ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f6b0bc 5fe0: 76f6aec0 76f6aeb0 000192bc 00132360 r10:00000036 r9:832ea400 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