8<--- cut here --- Unable to handle kernel paging request at virtual address fee00006 when write [fee00006] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 6147 Comm: syz.0.349 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 : [<813cb600>] lr : [<813cb5f0>] psr: 60000013 sp : dfac9d30 ip : dfac9d30 fp : dfac9d54 r10: 82b24900 r9 : 00000003 r8 : 83873d80 r7 : dfac9d90 r6 : 83873d80 r5 : 00000000 r4 : 00000000 r3 : fee00006 r2 : 81e1765c r1 : 00000001 r0 : 813cb270 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85b7b0c0 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 83873d80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfac8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 83873d80 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 0xdfac8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfac8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.0.349 (pid: 6147, stack limit = 0xdfac8000) Stack: (0xdfac9d30 to 0xdfaca000) 9d20: 823ecc98 83873d80 829d1b3c 829d1b3c 9d40: 81e17b1c 83873dc4 dfac9d8c dfac9d58 813c768c 813cb498 20000180 00000000 9d60: dfac9d7c 20000180 83873d80 b5403587 20000180 83b06c00 40946400 00000003 9d80: dfac9e4c dfac9d90 813c31d8 813c7590 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00000006 00000005 00000007 00000003 00000005 00002cc9 00000b2f 9dc0: 00000007 0000000a 0000e8aa 00000002 00000001 00000004 fffffffe 00000006 9de0: 0000000c 00000000 0001a449 00000001 40000003 00000081 0000caa7 00000800 9e00: 20001e58 00000007 00000e67 00000039 7fffffff 00000002 00000003 fffffff8 9e20: 00000000 cc2b6b4c 00000000 84952000 83873d80 20000180 20000180 83b06c00 9e40: dfac9f14 dfac9e50 813c41a4 813c30e4 00000000 00000000 00000000 cc2b6b4c 9e60: 00000000 00000000 8245d5b4 0000005f 83d68a30 83873db0 84115d8c 83b06c00 9e80: dfac9ee4 dfac9e90 807a5fa4 8079c39c 00000064 00000001 00000000 dfac9eac 9ea0: 85880d90 834de110 00006400 0000000b dfac9ea0 00000000 00000000 cc2b6b4c 9ec0: 84952000 40946400 20000180 20000180 84952000 00000003 dfac9ef4 dfac9ee8 9ee0: 807a60c4 cc2b6b4c dfac9f14 40946400 00000000 84952001 20000180 84952000 9f00: 00000003 83b06c00 dfac9fa4 dfac9f18 80577dc8 813c3bd4 ecac8b10 83b06c00 9f20: dfac9f3c dfac9f30 81a36298 81a36168 dfac9f54 dfac9f40 8025c478 8028d90c 9f40: dfac9fb0 40000000 dfac9f84 dfac9f58 802229ec 8025c434 00000000 8281cf74 9f60: dfac9fb0 0014ca70 ecac8b10 80222940 00000000 cc2b6b4c dfac9fac 00000000 9f80: 00000000 00316308 00000036 8020029c 83b06c00 00000036 00000000 dfac9fa8 9fa0: 80200060 80577ca4 00000000 00000000 00000003 40946400 20000180 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f3d0bc 9fe0: 76f3cec0 76f3ceb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813cb48c>] (parport_attach) from [<813c768c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:83873dc4 r5:81e17b1c r4:829d1b3c [<813c7584>] (comedi_device_attach) from [<813c31d8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83b06c00 r7:20000180 r6:b5403587 r5:83873d80 r4:20000180 [<813c30d8>] (do_devconfig_ioctl) from [<813c41a4>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83b06c00 r7:20000180 r6:20000180 r5:83873d80 r4:84952000 [<813c3bc8>] (comedi_unlocked_ioctl) from [<80577dc8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c3bc8>] (comedi_unlocked_ioctl) from [<80577dc8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c3bc8>] (comedi_unlocked_ioctl) from [<80577dc8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c3bc8>] (comedi_unlocked_ioctl) from [<80577dc8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83b06c00 r9:00000003 r8:84952000 r7:20000180 r6:84952001 r5:00000000 r4:40946400 [<80577c98>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfac9fa8 to 0xdfac9ff0) 9fa0: 00000000 00000000 00000003 40946400 20000180 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f3d0bc 9fe0: 76f3cec0 76f3ceb0 000195a4 00132510 r10:00000036 r9:83b06c00 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