8<--- cut here --- Unable to handle kernel paging request at virtual address fee01610 when write [fee01610] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 24652 Comm: syz.7.3915 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 : [<8144713c>] lr : [<8144712c>] psr: 60000013 sp : dfe35d30 ip : dfe35d30 fp : dfe35d54 r10: 82d2bd34 r9 : 00000003 r8 : 846d1a80 r7 : dfe35d90 r6 : 846d1a80 r5 : 00000000 r4 : 00000000 r3 : fee01610 r2 : 81e26d80 r1 : 00000001 r0 : 81446dac Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8baa5c80 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:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 846d1a80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfe34000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Register r8 information: slab kmalloc-192 start 846d1a80 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 0xdfe34000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Register r12 information: 2-page vmalloc region starting at 0xdfe34000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Process syz.7.3915 (pid: 24652, stack limit = 0xdfe34000) Stack: (0xdfe35d30 to 0xdfe36000) 5d20: 824b89b4 846d1a80 00000000 82bd24a0 5d40: 81e27240 00000000 dfe35d8c dfe35d58 81442cb0 81446fd4 40946400 00000000 5d60: dfe35d7c 200000c0 846d1a80 b5403587 40946400 00000003 00000003 847f0000 5d80: dfe35e4c dfe35d90 8143e4c8 81442bb4 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00001610 00000003 00000001 00000000 00000003 00000cc7 00000001 5dc0: 00000aab 0000000a 00000100 ffffffab 00000001 00010000 01100004 00000006 5de0: 00000009 00000034 0001a449 00000003 40000007 00000089 00000002 00000f27 5e00: 00000006 0000800b 00000ca8 00000005 00000004 00000400 00010000 fffffff7 5e20: 00000000 81f608aa 00000000 85cb6980 846d1a80 200000c0 40946400 00000003 5e40: dfe35f14 dfe35e50 8143f7ec 8143e400 00000000 81f608aa 00000000 00000000 5e60: 8252c804 dfe35ea4 0000005f 8413f0f0 00000064 846d1ab0 dfe35ee4 dfe35e88 5e80: 807dcbb4 807d2ee4 00000064 00000001 00000000 dfe35ea4 8b733910 834e93b8 5ea0: 00006400 0000000b dfe35e98 00000000 00000000 81f608aa 00000000 85cb6980 5ec0: 40946400 200000c0 200000c0 85cb6980 00000003 847f0000 dfe35ef4 dfe35ee8 5ee0: 807dcce8 81f608aa dfe35f14 00000000 85cb6981 40946400 200000c0 85cb6980 5f00: 00000003 847f0000 dfe35fa4 dfe35f18 8059a224 8143f4a4 ecac8b10 847f0000 5f20: dfe35f3c dfe35f30 81afe874 81afe740 dfe35f54 dfe35f40 8025a4dc 8028c2bc 5f40: dfe35fb0 40000000 dfe35f84 dfe35f58 80220be0 8025a498 00000000 82a1c27c 5f60: dfe35fb0 0013e4a0 ecac8b10 80220b34 00000000 81f608aa dfe35fac 00000000 5f80: 00000000 00346310 00000036 8020029c 847f0000 00000036 00000000 dfe35fa8 5fa0: 80200060 80599fec 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f430dc 5fe0: 76f42e88 76f42e78 00018bc4 00130300 60000010 00000003 00000000 00000000 Call trace: [<81446fc8>] (parport_attach) from [<81442cb0>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1077) r6:00000000 r5:81e27240 r4:82bd24a0 [<81442ba8>] (comedi_device_attach) from [<8143e4c8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:847f0000 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:846d1a80 r4:200000c0 [<8143e3f4>] (do_devconfig_ioctl) from [<8143f7ec>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:200000c0 r5:846d1a80 r4:85cb6980 [<8143f498>] (comedi_unlocked_ioctl) from [<8059a224>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8143f498>] (comedi_unlocked_ioctl) from [<8059a224>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8143f498>] (comedi_unlocked_ioctl) from [<8059a224>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8143f498>] (comedi_unlocked_ioctl) from [<8059a224>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:847f0000 r9:00000003 r8:85cb6980 r7:200000c0 r6:40946400 r5:85cb6981 r4:00000000 [<80599fe0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfe35fa8 to 0xdfe35ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f430dc 5fe0: 76f42e88 76f42e78 00018bc4 00130300 r10:00000036 r9:847f0000 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