8<--- cut here --- Unable to handle kernel paging request at virtual address fee00401 when write [fee00401] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 7338 Comm: syz.0.872 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 : df959d28 ip : df959d28 fp : df959d4c r10: 82b28ad8 r9 : 00000003 r8 : 843d9b40 r7 : df959d88 r6 : 843d9b40 r5 : 00000000 r4 : 00000000 r3 : fee00401 r2 : 81e1a2b8 r1 : 00000001 r0 : 814089a8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85e3d080 DAC: fffffffd 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 843d9b40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf958000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 843d9b40 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 0xdf958000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdf958000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.0.872 (pid: 7338, stack limit = 0xdf958000) Stack: (0xdf959d28 to 0xdf95a000) 9d20: 82432e8c 843d9b40 829d3f08 829d3f08 81e1a778 843d9b84 9d40: df959d84 df959d50 814049e0 81408bd0 843d9b70 00000000 df959d74 20000080 9d60: 843d9b40 b5403587 843d9b70 84588c00 40946400 00000002 df959e44 df959d88 9d80: 81400338 814048e4 656d6f63 705f6964 6f707261 00007472 00000000 00000401 9da0: 00000181 00007fff 0000000b 14000000 00000007 fffffffc 00000002 00000ffd 9dc0: 00007ffe 00000003 00000723 00000400 00000180 00000013 fffffff8 ffffffa7 9de0: 00000009 0000134f 00000001 00000082 0000007f 00000007 0000e2df 00000005 9e00: 00000001 00000004 00040000 00000007 00000f58 00000008 00000000 4c577fb2 9e20: 00000000 850f50c0 843d9b40 20000080 843d9b70 84588c00 df959f14 df959e48 9e40: 8140132c 81400244 00000000 00000000 00000000 00000000 00000000 4c577fb2 9e60: 00000000 00000000 824a35ec 0000005f 840ff210 00000064 8451d51c 84588c00 9e80: df959ee4 df959e90 807b7f80 807ae4a4 00000064 00000001 00000000 df959eac 9ea0: 85e40c10 834f3088 00006400 0000000b df959ea0 00000000 00000000 4c577fb2 9ec0: 850f50c0 40946400 20000080 20000080 850f50c0 00000003 df959ef4 df959ee8 9ee0: 807b80a0 4c577fb2 df959f14 40946400 00000000 850f50c1 20000080 850f50c0 9f00: 00000003 84588c00 df959fa4 df959f18 80585608 81400d7c ecac8b10 84588c00 9f20: df959f3c df959f30 81aaf9ac 81aaf87c df959f54 df959f40 8025bcbc 8028e0c4 9f40: df959fb0 40000000 df959f84 df959f58 80221a38 8025bc78 00000000 8281d17c 9f60: df959fb0 0014c8c0 ecac8b10 8022198c 00000000 4c577fb2 df959fac 00000000 9f80: 00000000 00326310 00000036 8020029c 84588c00 00000036 00000000 df959fa8 9fa0: 80200060 805854e4 00000000 00000000 00000003 40946400 20000080 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f460bc 9fe0: 76f45ec0 76f45eb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<81408bc4>] (parport_attach) from [<814049e0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:843d9b84 r5:81e1a778 r4:829d3f08 [<814048d8>] (comedi_device_attach) from [<81400338>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000002 r9:40946400 r8:84588c00 r7:843d9b70 r6:b5403587 r5:843d9b40 r4:20000080 [<81400238>] (do_devconfig_ioctl) from [<8140132c>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:84588c00 r7:843d9b70 r6:20000080 r5:843d9b40 r4:850f50c0 [<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) r10:84588c00 r9:00000003 r8:850f50c0 r7:20000080 r6:850f50c1 r5:00000000 r4:40946400 [<805854d8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf959fa8 to 0xdf959ff0) 9fa0: 00000000 00000000 00000003 40946400 20000080 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f460bc 9fe0: 76f45ec0 76f45eb0 000192bc 00132360 r10:00000036 r9:84588c00 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