8<--- cut here --- Unable to handle kernel paging request at virtual address fee02f00 when write [fee02f00] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 10642 Comm: syz.0.774 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: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 : [<8145b224>] lr : [<8145b214>] psr: 60000013 sp : dfae5d30 ip : dfae5d30 fp : dfae5d54 r10: 82d29754 r9 : 00000003 r8 : 8428a900 r7 : dfae5d90 r6 : 8428a900 r5 : 00000000 r4 : 00000000 r3 : fee02f00 r2 : 81e27168 r1 : 00000001 r0 : 8145ae84 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86298b80 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:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 8428a900 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfae4000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r8 information: slab kmalloc-192 start 8428a900 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 0xdfae4000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r12 information: 2-page vmalloc region starting at 0xdfae4000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Process syz.0.774 (pid: 10642, stack limit = 0xdfae4000) Stack: (0xdfae5d30 to 0xdfae6000) 5d20: 824bc540 8428a900 00000000 82bd2268 5d40: 81e27628 00000000 dfae5d8c dfae5d58 81456d88 8145b0ac 40946400 00000000 5d60: dfae5d7c 200000c0 8428a900 b5403587 40946400 00000003 00000003 85c03200 5d80: dfae5e4c dfae5d90 81452594 81456c8c 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00002f00 80000000 00000002 0000000c 00000001 00000005 00000079 5dc0: 00000003 00080008 00000000 00000002 00000001 00000007 00000003 00040002 5de0: 000000fd fffffffb 0000000d 00000005 80000000 00000008 00174000 00000000 5e00: 20001e58 ffffffff 0000f3a2 00000003 80000008 0000a6b5 24a05ffd ffffffff 5e20: 00000000 7f2ced71 00000000 8591fc80 8428a900 200000c0 40946400 00000003 5e40: dfae5f14 dfae5e50 814538b8 814524cc 00000000 7f2ced71 00000000 00000000 5e60: 82530804 dfae5ea4 0000005f 84447678 00000064 8428a930 dfae5ee4 dfae5e88 5e80: 807ea7c4 807e0ad8 00000064 00000001 00000000 dfae5ea4 8335a910 834d5aa0 5ea0: 00006400 0000000b dfae5e98 00000000 00000000 7f2ced71 00000000 8591fc80 5ec0: 40946400 200000c0 200000c0 8591fc80 00000003 85c03200 dfae5ef4 dfae5ee8 5ee0: 807ea8f8 7f2ced71 dfae5f14 00000000 8591fc81 40946400 200000c0 8591fc80 5f00: 00000003 85c03200 dfae5fa4 dfae5f18 805a2104 81453570 ecac8b10 85c03200 5f20: dfae5f3c dfae5f30 81b1a514 81b1a3e0 dfae5f54 dfae5f40 8025a6ac 8028e294 5f40: dfae5fb0 40000000 dfae5f84 dfae5f58 80220be0 8025a668 00000000 82a1c63c 5f60: dfae5fb0 0013e9b0 ecac8b10 80220b34 00000000 7f2ced71 dfae5fac 00000000 5f80: 00000000 00346310 00000036 8020029c 85c03200 00000036 00000000 dfae5fa8 5fa0: 80200060 805a1ecc 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f200dc 5fe0: 76f1fe88 76f1fe78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<8145b0a0>] (parport_attach) from [<81456d88>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27628 r4:82bd2268 [<81456c80>] (comedi_device_attach) from [<81452594>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:85c03200 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8428a900 r4:200000c0 [<814524c0>] (do_devconfig_ioctl) from [<814538b8>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:200000c0 r5:8428a900 r4:8591fc80 [<81453564>] (comedi_unlocked_ioctl) from [<805a2104>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81453564>] (comedi_unlocked_ioctl) from [<805a2104>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81453564>] (comedi_unlocked_ioctl) from [<805a2104>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81453564>] (comedi_unlocked_ioctl) from [<805a2104>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:85c03200 r9:00000003 r8:8591fc80 r7:200000c0 r6:40946400 r5:8591fc81 r4:00000000 [<805a1ec0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfae5fa8 to 0xdfae5ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f200dc 5fe0: 76f1fe88 76f1fe78 00018ebc 00130810 r10:00000036 r9:85c03200 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