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: 4627 Comm: syz.0.172 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:243 [inline] PC is at parport_attach+0x5c/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:243 [inline] LR is at parport_attach+0x50/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 pc : [<814d9218>] lr : [<814d920c>] psr: 60000013 sp : dfbc5d30 ip : dfbc5d30 fp : dfbc5d54 r10: 835316f0 r9 : 00000003 r8 : 84c3ccc0 r7 : dfbc5d90 r6 : dfbc5d90 r5 : 84c3ccc0 r4 : 00000000 r3 : fee02f00 r2 : 00000000 r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86e31ac0 DAC: fffffffd Register r0 information: NULL pointer Register r1 information: NULL pointer Register r2 information: NULL pointer 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: slab kmalloc-192 start 84c3ccc0 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xdfbc4000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2771 Register r7 information: 2-page vmalloc region starting at 0xdfbc4000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2771 Register r8 information: slab kmalloc-192 start 84c3ccc0 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 0xdfbc4000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2771 Register r12 information: 2-page vmalloc region starting at 0xdfbc4000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2771 Process syz.0.172 (pid: 4627, stack limit = 0xdfbc4000) Stack: (0xdfbc5d30 to 0xdfbc6000) 5d20: ffffffff 00000004 833d88c0 81e32f28 5d40: 00000000 dfbc5d90 dfbc5d8c dfbc5d58 814d4ea8 814d91c8 40946400 00000000 5d60: dfbc5d7c 20000300 84c3ccc0 b5403587 40946400 00000001 00000003 848f3200 5d80: dfbc5e4c dfbc5d90 814d06ac 814d4dac 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00002f00 00000005 0000d09a ffffffff 00000003 fffffffe 20000004 5dc0: 00000003 00000ffe 00000080 0000000c 00000002 00000004 00000008 0000ffff 5de0: 00000007 00000004 000007ff 00000830 00000008 00000009 00000009 00000800 5e00: 00000301 00000002 00008001 00000007 00000003 00000004 00000005 0000070f 5e20: 00000000 99f15084 00000000 86e19800 84c3ccc0 20000300 40946400 00000001 5e40: dfbc5f14 dfbc5e50 814d19d4 814d05ec 00000000 99f15084 00000000 00000000 5e60: 8254886c dfbc5ea4 0000005f 84b19a28 00000064 84c3ccf0 dfbc5ee4 dfbc5e88 5e80: 8082bb24 80821eb0 00000064 00000001 00000000 dfbc5ea4 867a9a10 83c3acc0 5ea0: 00006400 0000000b dfbc5e98 00000000 00000000 99f15084 00000000 86e19800 5ec0: 40946400 20000300 20000300 86e19800 00000003 848f3200 dfbc5ef4 dfbc5ee8 5ee0: 8082bc58 99f15084 dfbc5f14 00000000 86e19801 40946400 20000300 86e19800 5f00: 00000003 848f3200 dfbc5fa4 dfbc5f18 805d37dc 814d168c ecac8b10 848f3200 5f20: dfbc5f3c dfbc5f30 81bb0580 81bb044c dfbc5f54 dfbc5f40 8025b9d4 8028f74c 5f40: dfbc5fb0 40000000 dfbc5f84 dfbc5f58 80221bdc 8025b98c 00000000 8321a04c 5f60: dfbc5fb0 0013ec60 ecac8b10 80221b30 00000000 99f15084 dfbc5fac 00000000 5f80: 00000000 00356310 00000036 8020029c 848f3200 00000036 00000000 dfbc5fa8 5fa0: 80200060 805d35a4 00000000 00000000 00000003 40946400 20000300 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fee0dc 5fe0: 76fede88 76fede78 00019004 00130ac0 60000010 00000003 00000000 00000000 Call trace: [<814d91bc>] (parport_attach) from [<814d4ea8>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:dfbc5d90 r6:00000000 r5:81e32f28 r4:833d88c0 [<814d4da0>] (comedi_device_attach) from [<814d06ac>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:848f3200 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:84c3ccc0 r4:20000300 [<814d05e0>] (do_devconfig_ioctl) from [<814d19d4>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000300 r5:84c3ccc0 r4:86e19800 [<814d1680>] (comedi_unlocked_ioctl) from [<805d37dc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814d1680>] (comedi_unlocked_ioctl) from [<805d37dc>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814d1680>] (comedi_unlocked_ioctl) from [<805d37dc>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814d1680>] (comedi_unlocked_ioctl) from [<805d37dc>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:848f3200 r9:00000003 r8:86e19800 r7:20000300 r6:40946400 r5:86e19801 r4:00000000 [<805d3598>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbc5fa8 to 0xdfbc5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000300 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fee0dc 5fe0: 76fede88 76fede78 00019004 00130ac0 r10:00000036 r9:848f3200 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb5728f e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb5728f bl 0xfed5ca44 4: e5953064 ldr r3, [r5, #100] @ 0x64 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction