8<--- cut here --- Unable to handle kernel paging request at virtual address fee00100 when write [fee00100] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 10868 Comm: syz.8.1181 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 : [<81458564>] lr : [<81458554>] psr: 60000013 sp : dfbf9d30 ip : dfbf9d30 fp : dfbf9d54 r10: 82d2cdc4 r9 : 00000003 r8 : 8301ff00 r7 : dfbf9d90 r6 : 8301ff00 r5 : 00000000 r4 : 00000000 r3 : fee00100 r2 : 81e27508 r1 : 00000001 r0 : 814581c4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85d28f40 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 8301ff00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfbf8000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 8301ff00 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 0xdfbf8000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xdfbf8000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.8.1181 (pid: 10868, stack limit = 0xdfbf8000) Stack: (0xdfbf9d30 to 0xdfbfa000) 9d20: 824bc5f4 8301ff00 00000000 82bd2aa0 9d40: 81e279c8 00000000 dfbf9d8c dfbf9d58 814540c4 814583ec 40946400 00000000 9d60: dfbf9d7c 20000180 8301ff00 b5403587 40946400 00000003 00000003 83ff8c80 9d80: dfbf9e4c dfbf9d90 8144f8d0 81453fc8 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00000100 0000000f 000000d1 00000002 00000000 00000100 00000003 9dc0: 20000000 00000008 0000000c 00000000 00000b51 00000001 00000401 00010001 9de0: 00000001 01000000 00000008 00000fe8 00000401 80000000 00000002 00000007 9e00: 00000009 00000048 00000009 00000006 00006a77 00000002 00000008 0000000a 9e20: 00000000 9192c911 00000000 838dd500 8301ff00 20000180 40946400 00000003 9e40: dfbf9f14 dfbf9e50 81450bf4 8144f808 00000000 9192c911 00000000 00000000 9e60: 82530804 dfbf9ea4 0000005f 8459a230 00000064 8301ff30 dfbf9ee4 dfbf9e88 9e80: 807e94e0 807df7f4 00000064 00000001 00000000 dfbf9ea4 867200d0 834f6440 9ea0: 00006400 0000000b dfbf9e98 00000000 00000000 9192c911 00000000 838dd500 9ec0: 40946400 20000180 20000180 838dd500 00000003 83ff8c80 dfbf9ef4 dfbf9ee8 9ee0: 807e9614 9192c911 dfbf9f14 00000000 838dd501 40946400 20000180 838dd500 9f00: 00000003 83ff8c80 dfbf9fa4 dfbf9f18 805a185c 814508ac ecac8b10 83ff8c80 9f20: dfbf9f3c dfbf9f30 81b15f14 81b15de0 dfbf9f54 dfbf9f40 8025a694 8028e1b4 9f40: dfbf9fb0 40000000 dfbf9f84 dfbf9f58 80220be0 8025a650 00000000 82a1c63c 9f60: dfbf9fb0 0013e940 ecac8b10 80220b34 00000000 9192c911 dfbf9fac 00000000 9f80: 00000000 00346310 00000036 8020029c 83ff8c80 00000036 00000000 dfbf9fa8 9fa0: 80200060 805a1624 00000000 00000000 00000003 40946400 20000180 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f590dc 9fe0: 76f58e88 76f58e78 00018e58 001307a0 60000010 00000003 00000000 00000000 Call trace: [<814583e0>] (parport_attach) from [<814540c4>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e279c8 r4:82bd2aa0 [<81453fbc>] (comedi_device_attach) from [<8144f8d0>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:83ff8c80 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301ff00 r4:20000180 [<8144f7fc>] (do_devconfig_ioctl) from [<81450bf4>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:8301ff00 r4:838dd500 [<814508a0>] (comedi_unlocked_ioctl) from [<805a185c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814508a0>] (comedi_unlocked_ioctl) from [<805a185c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814508a0>] (comedi_unlocked_ioctl) from [<805a185c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814508a0>] (comedi_unlocked_ioctl) from [<805a185c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83ff8c80 r9:00000003 r8:838dd500 r7:20000180 r6:40946400 r5:838dd501 r4:00000000 [<805a1618>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbf9fa8 to 0xdfbf9ff0) 9fa0: 00000000 00000000 00000003 40946400 20000180 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f590dc 9fe0: 76f58e88 76f58e78 00018e58 001307a0 r10:00000036 r9:83ff8c80 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