8<--- cut here --- Unable to handle kernel paging request at virtual address fee00140 when write [fee00140] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 11409 Comm: syz.3.1790 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: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 : [<81496e30>] lr : [<81496e24>] psr: 60000013 sp : dfbf1d30 ip : dfbf1d30 fp : dfbf1d54 r10: 82d31eb4 r9 : 00000003 r8 : 83812480 r7 : dfbf1d90 r6 : dfbf1d90 r5 : 83812480 r4 : 00000000 r3 : fee00140 r2 : 00000000 r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 872d4b80 DAC: 00000000 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 83812480 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xdfbf0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r7 information: 2-page vmalloc region starting at 0xdfbf0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 83812480 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 0xdfbf0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfbf0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.3.1790 (pid: 11409, stack limit = 0xdfbf0000) Stack: (0xdfbf1d30 to 0xdfbf2000) 1d20: ffffffff 00000004 82bd92a4 81e2e4c8 1d40: 00000000 dfbf1d90 dfbf1d8c dfbf1d58 81492ac0 81496de0 40946400 00000000 1d60: dfbf1d7c 200003c0 83812480 b5403587 40946400 00000002 00000003 85056e40 1d80: dfbf1e4c dfbf1d90 8148e2c4 814929c4 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000140 00000000 0000000d 00000000 00000002 00000004 00000004 1dc0: 00000002 00000007 0002c731 04000004 00000001 00002009 00000008 000004ce 1de0: 00009e9b 00000103 80000006 00000008 00000000 00000007 00000005 0000002f 1e00: 00000081 00000ffd 00000006 000000ab 00000001 00000280 00008000 00400006 1e20: 00000000 e6d89a47 00000000 86a30b00 83812480 200003c0 40946400 00000002 1e40: dfbf1f14 dfbf1e50 8148f5ec 8148e204 00000000 e6d89a47 00000000 00000000 1e60: 8254c844 dfbf1ea4 0000005f 8444c058 00000064 838124b0 dfbf1ee4 dfbf1e88 1e80: 80807dc4 807fe47c 00000064 00000001 00000000 dfbf1ea4 85f91510 834f06e8 1ea0: 00006400 0000000b dfbf1e98 00000000 00000000 e6d89a47 dfbf1efc 86a30b00 1ec0: 40946400 200003c0 200003c0 86a30b00 00000003 85056e40 dfbf1ef4 dfbf1ee8 1ee0: 80807ef8 e6d89a47 dfbf1f14 00000000 86a30b01 40946400 200003c0 86a30b00 1f00: 00000003 85056e40 dfbf1fa4 dfbf1f18 805bc574 8148f2a4 830a58f8 00000036 1f20: dfbf1fb0 8020029c 85056e40 00400000 dfbf1f7c dfbf1f40 80228f90 803a901c 1f40: dfbf1fb0 8301ea80 87800080 830a58f8 87800084 00000000 00000000 e6d89a47 1f60: 85056e40 dfbf1fb0 86042308 00000036 dfbf1fa4 e6d89a47 8022a1b8 00000000 1f80: 00000000 00356310 00000036 8020029c 85056e40 00000036 00000000 dfbf1fa8 1fa0: 8020028c 805bc33c 00000000 00000000 00000003 40946400 200003c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f5f0dc 1fe0: 76f5ee88 76f5ee78 00018fa0 001309d0 60000010 00000003 00000000 00000000 Call trace: [<81496dd4>] (parport_attach) from [<81492ac0>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:dfbf1d90 r6:00000000 r5:81e2e4c8 r4:82bd92a4 [<814929b8>] (comedi_device_attach) from [<8148e2c4>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:85056e40 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:83812480 r4:200003c0 [<8148e1f8>] (do_devconfig_ioctl) from [<8148f5ec>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:83812480 r4:86a30b00 [<8148f298>] (comedi_unlocked_ioctl) from [<805bc574>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148f298>] (comedi_unlocked_ioctl) from [<805bc574>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148f298>] (comedi_unlocked_ioctl) from [<805bc574>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148f298>] (comedi_unlocked_ioctl) from [<805bc574>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:85056e40 r9:00000003 r8:86a30b00 r7:200003c0 r6:40946400 r5:86a30b01 r4:00000000 [<805bc330>] (sys_ioctl) from [<8020028c>] (__sys_trace_return+0x0/0x10) Exception stack(0xdfbf1fa8 to 0xdfbf1ff0) 1fa0: 00000000 00000000 00000003 40946400 200003c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f5f0dc 1fe0: 76f5ee88 76f5ee78 00018fa0 001309d0 r10:00000036 r9:85056e40 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb67b7c e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb67b7c bl 0xfed9edf8 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