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: 0 UID: 0 PID: 23414 Comm: syz.6.4656 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 : [<81495128>] lr : [<8149511c>] psr: 60000013 sp : dfa09d30 ip : dfa09d30 fp : dfa09d54 r10: 82d30dfc r9 : 00000003 r8 : 845d60c0 r7 : dfa09d90 r6 : dfa09d90 r5 : 845d60c0 r4 : 00000000 r3 : fee00140 r2 : 00000000 r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 863fe540 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 845d60c0 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xdfa08000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r7 information: 2-page vmalloc region starting at 0xdfa08000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 845d60c0 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 0xdfa08000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfa08000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.6.4656 (pid: 23414, stack limit = 0xdfa08000) Stack: (0xdfa09d30 to 0xdfa0a000) 9d20: ffffffff 00000004 82bd8ea0 81e2e448 9d40: 00000000 dfa09d90 dfa09d8c dfa09d58 81490db4 814950d8 40946400 00000000 9d60: dfa09d7c 200003c0 845d60c0 b5403587 40946400 00000002 00000003 83e10c40 9d80: dfa09e4c dfa09d90 8148c5b8 81490cb8 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00000140 fffffffc 0001000c 0002dddc 00000000 00010000 00007fff 9dc0: 00000006 00000007 0000c72c 02000004 0000000f 0000c000 00000008 000004ce 9de0: 00008e99 00000001 000000ed 00000006 00000008 00000004 00000000 0000000a 9e00: 00000009 00000ffd 00000009 000000af 00000002 00000283 00008001 0000e43f 9e20: 00000000 e7f7cfd7 00000000 867a5080 845d60c0 200003c0 40946400 00000002 9e40: dfa09f14 dfa09e50 8148d8e0 8148c4f8 00000000 e7f7cfd7 00000000 00000000 9e60: 8254a844 dfa09ea4 0000005f 843b8b68 00000064 845d60f0 dfa09ee4 dfa09e88 9e80: 808065fc 807fccb4 00000064 00000001 00000000 dfa09ea4 8537ea10 834f0908 9ea0: 00006400 0000000b dfa09e98 00000000 00000000 e7f7cfd7 00000000 867a5080 9ec0: 40946400 200003c0 200003c0 867a5080 00000003 83e10c40 dfa09ef4 dfa09ee8 9ee0: 80806730 e7f7cfd7 dfa09f14 00000000 867a5081 40946400 200003c0 867a5080 9f00: 00000003 83e10c40 dfa09fa4 dfa09f18 805bb114 8148d598 ecac8b10 83e10c40 9f20: dfa09f3c dfa09f30 81b5c4e0 81b5c3ac dfa09f54 dfa09f40 8025a7a8 8028e490 9f40: dfa09fb0 40000000 dfa09f84 dfa09f58 80220bdc 8025a764 00000000 82a1eb0c 9f60: dfa09fb0 0013eb80 ecac8b10 80220b30 00000000 e7f7cfd7 dfa09fac 00000000 9f80: 00000000 00356310 00000036 8020029c 83e10c40 00000036 00000000 dfa09fa8 9fa0: 80200060 805baedc 00000000 00000000 00000003 40946400 200003c0 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f200dc 9fe0: 76f1fe88 76f1fe78 00018f80 001309e0 60000010 00000003 00000000 00000000 Call trace: [<814950cc>] (parport_attach) from [<81490db4>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:dfa09d90 r6:00000000 r5:81e2e448 r4:82bd8ea0 [<81490cac>] (comedi_device_attach) from [<8148c5b8>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:83e10c40 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:845d60c0 r4:200003c0 [<8148c4ec>] (do_devconfig_ioctl) from [<8148d8e0>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:845d60c0 r4:867a5080 [<8148d58c>] (comedi_unlocked_ioctl) from [<805bb114>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148d58c>] (comedi_unlocked_ioctl) from [<805bb114>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148d58c>] (comedi_unlocked_ioctl) from [<805bb114>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148d58c>] (comedi_unlocked_ioctl) from [<805bb114>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83e10c40 r9:00000003 r8:867a5080 r7:200003c0 r6:40946400 r5:867a5081 r4:00000000 [<805baed0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa09fa8 to 0xdfa09ff0) 9fa0: 00000000 00000000 00000003 40946400 200003c0 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f200dc 9fe0: 76f1fe88 76f1fe78 00018f80 001309e0 r10:00000036 r9:83e10c40 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb67ebe e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb67ebe bl 0xfed9fb00 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