8<--- cut here --- Unable to handle kernel paging request at virtual address fee08001 when write [fee08001] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 30166 Comm: syz.3.11955 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<813ced60>] lr : [<813ced50>] psr: 60000013 sp : dfb51d30 ip : dfb51d30 fp : dfb51d54 r10: 82b25910 r9 : 00000003 r8 : 841cf240 r7 : dfb51d90 r6 : 841cf240 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e1777c r1 : 00000001 r0 : 813ce9d0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 981a2340 DAC: fffffffd 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:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 841cf240 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb50000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 841cf240 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 0xdfb50000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfb50000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.3.11955 (pid: 30166, stack limit = 0xdfb50000) Stack: (0xdfb51d30 to 0xdfb52000) 1d20: 823f1638 841cf240 829d1c34 829d1c34 1d40: 81e17c3c 841cf284 dfb51d8c dfb51d58 813cadec 813cebf8 20000180 00000000 1d60: dfb51d7c 20000180 841cf240 b5403587 20000180 83b15400 40946400 00000000 1d80: dfb51e4c dfb51d90 813c6938 813cacf0 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00008001 00000200 00000001 00000000 00000002 00000cc7 00000005 1dc0: 00000007 00000005 00000100 0000000c 00000001 00000008 00000004 00008006 1de0: ffffffff 00000001 0001a449 00007fff 40000003 00000089 00000022 00000f27 1e00: 00000006 0000000b 00000008 00000005 00000008 00000004 00010000 fffffff8 1e20: 00000000 ef1796c0 00000000 84d92000 841cf240 20000180 20000180 83b15400 1e40: dfb51f14 dfb51e50 813c7904 813c6844 00000000 dfb51e54 dfb51e54 ef1796c0 1e60: 00000000 00000000 824625b4 0000005f 83e24448 841cf270 840ad1bc 83b15400 1e80: dfb51ee4 dfb51e90 807a7d9c 8079e194 00000064 00000001 00000000 dfb51eac 1ea0: 857e2d90 834da6e8 00006400 0000000b dfb51ea0 00000000 dfb51d30 ef1796c0 1ec0: 84d92000 40946400 20000180 20000180 84d92000 00000003 dfb51ef4 dfb51ee8 1ee0: 807a7ebc ef1796c0 dfb51f14 40946400 00000000 84d92001 20000180 84d92000 1f00: 00000003 83b15400 dfb51fa4 dfb51f18 80578f00 813c7334 ecac8b10 83b15400 1f20: dfb51f3c dfb51f30 81a61760 81a61630 dfb51f54 dfb51f40 8025c484 8028d914 1f40: dfb51fb0 40000000 dfb51f84 dfb51f58 802229ec 8025c440 00000000 8281cfb4 1f60: dfb51fb0 0014ced0 ecac8b10 80222940 00000000 ef1796c0 dfb51fac 00000000 1f80: 00000000 00316308 00000036 8020029c 83b15400 00000036 00000000 dfb51fa8 1fa0: 80200060 80578ddc 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f7a0bc 1fe0: 76f79ec0 76f79eb0 00019294 00132970 60000010 00000003 00000000 00000000 Call trace: [<813cebec>] (parport_attach) from [<813cadec>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:841cf284 r5:81e17c3c r4:829d1c34 [<813cace4>] (comedi_device_attach) from [<813c6938>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000000 r9:40946400 r8:83b15400 r7:20000180 r6:b5403587 r5:841cf240 r4:20000180 [<813c6838>] (do_devconfig_ioctl) from [<813c7904>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83b15400 r7:20000180 r6:20000180 r5:841cf240 r4:84d92000 [<813c7328>] (comedi_unlocked_ioctl) from [<80578f00>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c7328>] (comedi_unlocked_ioctl) from [<80578f00>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c7328>] (comedi_unlocked_ioctl) from [<80578f00>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c7328>] (comedi_unlocked_ioctl) from [<80578f00>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83b15400 r9:00000003 r8:84d92000 r7:20000180 r6:84d92001 r5:00000000 r4:40946400 [<80578dd0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb51fa8 to 0xdfb51ff0) 1fa0: 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f7a0bc 1fe0: 76f79ec0 76f79eb0 00019294 00132970 r10:00000036 r9:83b15400 r8:8020029c r7:00000036 r6:00316308 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 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