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: 12510 Comm: syz.2.1078 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:99 [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 : [<81492254>] lr : [<81492244>] psr: 60000013 sp : dfcf5d30 ip : dfcf5d30 fp : dfcf5d54 r10: 82d30dfc r9 : 00000003 r8 : 844ab6c0 r7 : dfcf5d90 r6 : 844ab6c0 r5 : 00000000 r4 : 00000000 r3 : fee00100 r2 : 81e2dc68 r1 : 00000001 r0 : 81491eb4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 866deb40 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 844ab6c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfcf4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 844ab6c0 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 0xdfcf4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfcf4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.2.1078 (pid: 12510, stack limit = 0xdfcf4000) Stack: (0xdfcf5d30 to 0xdfcf6000) 5d20: 824d4278 844ab6c0 82bd8e44 82bd8e44 5d40: 81e2e128 00000000 dfcf5d8c dfcf5d58 8148ddcc 814920dc 40946400 00000000 5d60: dfcf5d7c 20000180 844ab6c0 b5403587 40946400 00000003 00000003 850bd5c0 5d80: dfcf5e4c dfcf5d90 814895d0 8148dcd0 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000100 0000000f 00000003 00000002 00000005 00000100 00000003 5dc0: 20000010 00000008 0000000b 00000005 00000007 00000001 00000401 00010001 5de0: 00000001 00000000 00000008 00000fe9 00000401 00000003 00000002 00000007 5e00: 00000009 00000048 00000009 00000007 00006a7a 00000003 00000007 00000008 5e20: 00000000 288130ce 00000000 8664a000 844ab6c0 20000180 40946400 00000003 5e40: dfcf5f14 dfcf5e50 8148a8f8 81489510 00000000 288130ce 00000000 00000000 5e60: 8254980c dfcf5ea4 0000005f 84163850 00000064 844ab6f0 dfcf5ee4 dfcf5e88 5e80: 80805b6c 807fbe9c 00000064 00000001 00000000 dfcf5ea4 85dcb010 834edee0 5ea0: 00006400 0000000b dfcf5e98 00000000 00000000 288130ce 00000001 8664a000 5ec0: 40946400 20000180 20000180 8664a000 00000003 850bd5c0 dfcf5ef4 dfcf5ee8 5ee0: 80805ca0 288130ce dfcf5f14 00000000 8664a001 40946400 20000180 8664a000 5f00: 00000003 850bd5c0 dfcf5fa4 dfcf5f18 805bab08 8148a5b0 ecac8b10 850bd5c0 5f20: dfcf5f3c dfcf5f30 81b56440 81b5630c dfcf5f54 dfcf5f40 8025a7a4 8028e480 5f40: dfcf5fb0 40000000 dfcf5f84 dfcf5f58 80220bdc 8025a760 00000000 82a1eb0c 5f60: dfcf5fb0 0013e9c0 ecac8b10 80220b30 00000000 288130ce dfcf5fac 00000000 5f80: 00000000 00356310 00000036 8020029c 850bd5c0 00000036 00000000 dfcf5fa8 5fa0: 80200060 805ba8d0 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fb20dc 5fe0: 76fb1e88 76fb1e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<814920d0>] (parport_attach) from [<8148ddcc>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e2e128 r4:82bd8e44 [<8148dcc4>] (comedi_device_attach) from [<814895d0>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:850bd5c0 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:844ab6c0 r4:20000180 [<81489504>] (do_devconfig_ioctl) from [<8148a8f8>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:844ab6c0 r4:8664a000 [<8148a5a4>] (comedi_unlocked_ioctl) from [<805bab08>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148a5a4>] (comedi_unlocked_ioctl) from [<805bab08>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148a5a4>] (comedi_unlocked_ioctl) from [<805bab08>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148a5a4>] (comedi_unlocked_ioctl) from [<805bab08>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:850bd5c0 r9:00000003 r8:8664a000 r7:20000180 r6:40946400 r5:8664a001 r4:00000000 [<805ba8c4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfcf5fa8 to 0xdfcf5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fb20dc 5fe0: 76fb1e88 76fb1e78 00018ebc 00130820 r10:00000036 r9:850bd5c0 r8:8020029c r7:00000036 r6:00356310 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