8<--- cut here --- Unable to handle kernel paging request at virtual address fee00078 when write [fee00078] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 20392 Comm: syz.1.4291 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 : [<814a0758>] lr : [<814a074c>] psr: 60000013 sp : dfa51d30 ip : dfa51d30 fp : dfa51d54 r10: 82d32f9c r9 : 00000003 r8 : 842bc600 r7 : dfa51d90 r6 : dfa51d90 r5 : 842bc600 r4 : 00000000 r3 : fee00078 r2 : 00000000 r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86566d80 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 842bc600 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xdfa50000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Register r7 information: 2-page vmalloc region starting at 0xdfa50000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Register r8 information: slab kmalloc-192 start 842bc600 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 0xdfa50000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Register r12 information: 2-page vmalloc region starting at 0xdfa50000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Process syz.1.4291 (pid: 20392, stack limit = 0xdfa50000) Stack: (0xdfa51d30 to 0xdfa52000) 1d20: ffffffff 00000004 82bda4a4 81e2e9e8 1d40: 00000000 dfa51d90 dfa51d8c dfa51d58 8149c3e8 814a0708 40946400 00000000 1d60: dfa51d7c 20000600 842bc600 b5403587 40946400 00000003 00000003 84f10000 1d80: dfa51e4c dfa51d90 81497bec 8149c2ec 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000078 00000000 00000000 0000000c 00000008 00000003 00100002 1dc0: 00000007 00000005 00200002 00000004 00000001 00000001 00020003 00000000 1de0: 00000101 00000083 80000000 00000003 00001b18 00000016 00000004 00000000 1e00: ffffffff 0000000b 00000004 0000003b 0000000c 10000006 00000664 fffffff8 1e20: 00000000 f75ed1dd 00000000 83a77300 842bc600 20000600 40946400 00000003 1e40: dfa51f14 dfa51e50 81498f14 81497b2c dfa51e4c f75ed1dd 00000000 00000000 1e60: 8254e844 dfa51ea4 0000005f 8419f0f0 00000064 842bc630 dfa51ee4 dfa51e88 1e80: 8080b76c 80801e24 00000064 00000001 00000000 dfa51ea4 86254110 8342d440 1ea0: 00006400 0000000b dfa51e98 00000000 dfa51d38 f75ed1dd 00000000 83a77300 1ec0: 40946400 20000600 20000600 83a77300 00000003 84f10000 dfa51ef4 dfa51ee8 1ee0: 8080b8a0 f75ed1dd dfa51f14 00000000 83a77301 40946400 20000600 83a77300 1f00: 00000003 84f10000 dfa51fa4 dfa51f18 805bdf78 81498bcc ecac8b10 84f10000 1f20: dfa51f3c dfa51f30 81b6ec00 81b6eacc dfa51f54 dfa51f40 8025b878 8028f548 1f40: dfa51fb0 40000000 dfa51f84 dfa51f58 80221bdc 8025b834 00000000 82a1eb0c 1f60: dfa51fb0 0013eb70 ecac8b10 80221b30 00000000 f75ed1dd dfa51fac 00000000 1f80: 00000000 00356310 00000036 8020029c 84f10000 00000036 00000000 dfa51fa8 1fa0: 80200060 805bdd40 00000000 00000000 00000003 40946400 20000600 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f620dc 1fe0: 76f61e88 76f61e78 00018fa0 001309d0 60000010 00000003 00000000 00000000 Call trace: [<814a06fc>] (parport_attach) from [<8149c3e8>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:dfa51d90 r6:00000000 r5:81e2e9e8 r4:82bda4a4 [<8149c2e0>] (comedi_device_attach) from [<81497bec>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:84f10000 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:842bc600 r4:20000600 [<81497b20>] (do_devconfig_ioctl) from [<81498f14>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000600 r5:842bc600 r4:83a77300 [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84f10000 r9:00000003 r8:83a77300 r7:20000600 r6:40946400 r5:83a77301 r4:00000000 [<805bdd34>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa51fa8 to 0xdfa51ff0) 1fa0: 00000000 00000000 00000003 40946400 20000600 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f620dc 1fe0: 76f61e88 76f61e78 00018fa0 001309d0 r10:00000036 r9:84f10000 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb6552a e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb6552a bl 0xfed954b0 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